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      // ===== TITLE =====
      heading1('INTRODUCTION'),
      emptyLine(),

      // ===== SECTION 1: Overview of high-risk pregnancy =====
      heading2('1. High-Risk Pregnancy: Definition and Global Burden'),

      para([
        txt('Pregnancy is a physiological state that, despite its natural occurrence, carries inherent risks to both mother and fetus. The concept of '),
        txt('high-risk pregnancy', { italic: true }),
        txt(' encompasses a wide spectrum of conditions in which the likelihood of an adverse maternal or fetal outcome is substantially higher than in the general obstetric population.'),
        sup('1'),
        txt(' High-risk pregnancies include those complicated by maternal medical disorders such as diabetes mellitus, hypertensive disorders of pregnancy (including pre-eclampsia and eclampsia), cardiac disease, renal disease, and thyroid dysfunction, as well as obstetric complications such as intrauterine growth restriction (IUGR), placenta praevia, placental abruption, preterm labour, post-term pregnancy, oligohydramnios, and multiple gestations.'),
        sup('2'),
      ], { indent: true }),

      para([
        txt('Globally, approximately 15% of all pregnancies are classified as high-risk, yet they account for a disproportionately large share of perinatal morbidity and mortality.'),
        sup('3'),
        txt(' According to the World Health Organization (WHO), an estimated 2.4 million neonates die in the first month of life annually, and a further 2 million stillbirths occur each year, with the overwhelming majority occurring in low- and middle-income countries.'),
        sup('4'),
        txt(' In India, despite considerable advances in obstetric care and the introduction of national programmes such as Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA), which identified over 11.66 lakh high-risk pregnancies across the country, maternal and perinatal mortality rates remain a significant public health challenge.'),
        sup('5'),
        txt(' The identification and meticulous monitoring of high-risk pregnancies, followed by timely and appropriate obstetric intervention, is therefore an essential component of modern antenatal care.'),
      ], { indent: true }),

      // ===== SECTION 2: Definition and significance of fetal surveillance =====
      heading2('2. Antepartum Fetal Surveillance'),

      para([
        txt('Antepartum fetal surveillance refers to the use of clinical and technological methods to assess fetal well-being in utero, with the primary objective of identifying the compromised fetus before irreversible injury or intrauterine death occurs.'),
        sup('6'),
        txt(' The principal tools of antepartum surveillance include fetal movement counting (FMC), the non-stress test (NST), the contraction stress test (CST), the biophysical profile (BPP), the modified biophysical profile, and Doppler velocimetry of the fetal and uteroplacental circulation.'),
        sup('7'),
        txt(' Among these, cardiotocography (CTG) — which records the fetal heart rate (FHR) continuously alongside uterine contractions — has become the cornerstone of antepartum fetal assessment in high-risk pregnancies worldwide.'),
        sup('8'),
      ], { indent: true }),

      para([
        txt('The rationale for antepartum fetal surveillance rests upon the understanding that uteroplacental insufficiency, the common pathway of many high-risk conditions, leads to progressive fetal hypoxaemia, acidosis, and ultimately asphyxia.'),
        sup('9'),
        txt(' The fetal heart rate reflects the state of the central and autonomic nervous system, which is exquisitely sensitive to alterations in oxygen delivery. Changes in FHR patterns — including loss of accelerations, presence of decelerations, reduced baseline variability, and alterations in short-term variation (STV) — serve as indirect markers of fetal hypoxic stress.'),
        sup('10'),
        txt(' Prompt recognition of these changes enables clinicians to modify management, institute intrauterine resuscitation, or expedite delivery, thereby improving fetomaternal outcomes.'),
      ], { indent: true }),

      // ===== SECTION 3: Cardiotocography =====
      heading2('3. Cardiotocography: Principles and Classification'),

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        txt('Cardiotocography was introduced into clinical practice in the 1960s and has since become one of the most widely used tests in obstetrics.'),
        sup('11'),
        txt(' A standard CTG records the FHR via an external ultrasound transducer (Doppler) or, in labour, an internal fetal scalp electrode, alongside uterine activity measured by a tocodynamometer. The primary parameters evaluated on a CTG trace include: (i) '),
        txt('baseline fetal heart rate', { italic: true }),
        txt(' (normal: 110-160 bpm); (ii) '),
        txt('baseline variability', { italic: true }),
        txt(' (normal: 5-25 bpm); (iii) '),
        txt('accelerations', { italic: true }),
        txt(' — transient increases in FHR of ≥15 bpm lasting ≥15 seconds; and (iv) '),
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        txt(' — transient decreases in FHR, classified as early, variable, late, or prolonged.'),
        sup('12'),
      ], { indent: true }),

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        txt('Based on these parameters, CTG traces are classified as reassuring (normal), suspicious (non-reassuring), or pathological (abnormal) according to international guidelines including those of the National Institute for Health and Care Excellence (NICE), the International Federation of Gynecology and Obstetrics (FIGO), and the Royal College of Obstetricians and Gynaecologists (RCOG).'),
        sup('13'),
        txt(' Modern computerised cardiotocography (cCTG) uses automated software algorithms — most notably the Dawes-Redman criteria — to objectively quantify short-term variation in the fetal heart rate, providing a more reproducible and less subjective assessment compared to visual (manual) CTG interpretation.'),
        sup('14'),
      ], { indent: true }),

      // ===== SECTION 4: Non-Reactive CTG =====
      heading2('4. Non-Reactive Cardiotocography: Definition and Clinical Significance'),

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        txt('A '),
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        txt(' is defined as the absence of at least two accelerations of ≥15 bpm lasting ≥15 seconds within a 20-40 minute recording period, in the context of antepartum testing.'),
        sup('15'),
        txt(' In clinical practice, an initial non-reactive tracing of 20 minutes is extended to 40 minutes to account for fetal sleep cycles; traces remaining non-reactive beyond this period are considered truly non-reactive and indicate the need for further evaluation.'),
        sup('16'),
        txt(' The non-stress test was introduced as a primary screening tool for uteroplacental insufficiency, and its reactivity is considered a strong indicator of fetal well-being: a reactive NST carries a false-negative rate for fetal death within one week of less than 0.3 per 1000 pregnancies.'),
        sup('6'),
      ], { indent: true }),

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        txt('A non-reactive CTG may arise from a variety of causes that do not necessarily indicate fetal compromise. Physiological causes include fetal sleep states, fetal immaturity (particularly at gestational ages below 32 weeks), maternal sedative medication, and maternal smoking.'),
        sup('17'),
        txt(' However, pathological non-reactivity — in the context of high-risk pregnancies — may reflect genuine fetal hypoxaemia, acidosis, or neurological depression secondary to uteroplacental insufficiency, placental abruption, severe IUGR, cord compression, or fetal anaemia.'),
        sup('18'),
        txt(' The clinical challenge lies in distinguishing benign from ominous causes of non-reactivity, and in correlating the CTG findings with the overall clinical context and other surveillance modalities.'),
      ], { indent: true }),

      para([
        txt('The prognostic significance of a non-reactive CTG in high-risk pregnancies has been demonstrated in multiple observational studies. Pregnancies with persistent NRCTG carry a substantially elevated risk of perinatal asphyxia, low Apgar scores, neonatal intensive care unit (NICU) admission, meconium-stained liquor, emergency caesarean section, and perinatal death compared to those with reactive traces.'),
        sup('19'),
        txt(' Bhide et al. (2024) demonstrated in a large retrospective cohort of over 14,000 antenatal CTG records in high-risk pregnancies that failure to meet the Dawes-Redman criteria was associated with an odds ratio of 8.78 (95% CI 4.28-18.02) for stillbirth, even after excluding those with abnormally low short-term variation.'),
        sup('20'),
        txt(' This underscores the imperative for expeditious and structured management of NRCTG in high-risk pregnancies.'),
      ], { indent: true }),

      // ===== SECTION 5: CTG in high-risk context and evidence =====
      heading2('5. Cardiotocography in High-Risk Pregnancies: Evidence Base'),

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        txt('The role of antepartum CTG in modifying perinatal outcomes has been the subject of extensive investigation. A systematic review and meta-analysis by Baker et al. (2021) comparing visual and computerised antenatal CTG in the prevention of perinatal morbidity and mortality found a non-significant reduction in all-cause perinatal mortality (RR 0.23, 95% CI 0.04-1.30) and in preventable perinatal mortality (RR 0.27, 95% CI 0.05-1.56) with computerised CTG relative to visual interpretation.'),
        sup('14'),
        txt(' All randomised controlled trials included in this review exclusively enrolled high-risk women, confirming that this population represents the primary target group for intensive CTG surveillance. Computerised CTG was further noted to reduce maternal hospital stay and the need for additional investigations.'),
        sup('14'),
      ], { indent: true }),

      para([
        txt('High-risk conditions most commonly associated with NRCTG in published literature include hypertensive disorders of pregnancy, gestational diabetes mellitus (GDM), IUGR, post-term pregnancy, oligohydramnios, and anaemia.'),
        sup('21,22'),
        txt(' Each of these conditions compromises the uteroplacental unit through distinct pathophysiological mechanisms. In pre-eclampsia, abnormal placentation and defective trophoblastic invasion lead to reduced uteroplacental blood flow, fetal hypoxaemia, and consequent loss of FHR reactivity. In GDM, chronic hyperglycaemia promotes fetal macrosomia and polycythaemia, increasing oxygen demand and susceptibility to hypoxic stress. In IUGR, progressive placental insufficiency results in redistribution of fetal blood flow, with brain-sparing characterised on Doppler as absent or reversed end-diastolic flow in the umbilical artery, culminating in autonomic dysfunction and loss of FHR accelerations.'),
        sup('9,23'),
      ], { indent: true }),

      para([
        txt('A narrative review by Piron-Dumitrascu et al. (2025) on fetal and maternal surveillance in high-risk pregnancies emphasised that stratification of high-risk pregnancies through systematic surveillance — including CTG — can be followed by a measurable decrease in perinatal mortality through timely obstetric intervention.'),
        sup('4'),
        txt(' The review advocated for integrated surveillance combining fetal movement assessment, CTG, and ultrasound-Doppler evaluation in cases of placental pathology or small for gestational age (SGA)/fetal growth restriction (FGR), acknowledging that no single test in isolation provides sufficient sensitivity and specificity for the prediction of adverse outcomes.'),
        sup('4'),
      ], { indent: true }),

      // ===== SECTION 6: Fetomaternal outcomes =====
      heading2('6. Fetomaternal Outcomes in High-Risk Pregnancy'),

      para([
        txt('The term '),
        txt('fetomaternal outcome', { italic: true }),
        txt(' encompasses the composite of maternal and fetal/neonatal outcomes in a given pregnancy. Maternal outcomes of relevance in high-risk pregnancy include mode of delivery (spontaneous vaginal delivery, instrumental delivery, or caesarean section), postpartum haemorrhage, wound complications, hypertensive crises, eclampsia, ICU admission, and maternal mortality.'),
        sup('25'),
        txt(' Fetal and neonatal outcomes include gestational age at delivery, birth weight, Apgar scores at 1 and 5 minutes, need for neonatal resuscitation, NICU admission, meconium aspiration syndrome (MAS), hypoxic-ischaemic encephalopathy (HIE), neonatal seizures, perinatal asphyxia, stillbirth, and early neonatal death.'),
        sup('26'),
      ], { indent: true }),

      para([
        txt('The integration of CTG findings — particularly the detection of non-reactive traces — with overall clinical assessment directly influences obstetric management and therefore shapes fetomaternal outcomes.'),
        sup('27'),
        txt(' An abnormal or non-reactive CTG in a high-risk pregnancy frequently triggers further evaluation with BPP or Doppler studies, or may prompt emergency delivery by induction of labour or caesarean section.'),
        sup('28'),
        txt(' The timing and mode of delivery are critical determinants of neonatal outcome: premature intervention risks iatrogenic prematurity, while delayed intervention risks fetal asphyxia, stillbirth, or neonatal encephalopathy. Optimising this balance through objective, evidence-based interpretation of fetal monitoring data remains one of the central challenges in modern obstetrics.'),
        sup('29'),
      ], { indent: true }),

      para([
        txt('Non-reassuring fetal heart rate patterns — the intrapartum counterpart of the antenatal NRCTG — are among the most common indications for emergency caesarean section globally, contributing significantly to the rising rate of operative delivery.'),
        sup('30'),
        txt(' Research has consistently shown that non-reassuring FHR tracings in high-risk labours are associated with adverse neonatal outcomes including low Apgar scores, cord blood acidaemia, and neonatal ICU admissions.'),
        sup('31'),
        txt(' Meconium-stained amniotic fluid, frequently co-occurring with non-reactive or pathological CTG patterns, further compounds the risk of neonatal respiratory morbidity and MAS.'),
        sup('32'),
      ], { indent: true }),

      // ===== SECTION 7: Rationale for this study =====
      heading2('7. Rationale for the Present Study'),

      para([
        txt('Despite the widespread use of CTG in antenatal high-risk clinics, there remains a paucity of robust data — particularly from tertiary care centres in developing countries — characterising the specific fetomaternal outcomes associated with non-reactive CTG in high-risk pregnancies. Many published studies are limited by small sample sizes, heterogeneous definitions of high-risk pregnancy, lack of standardised CTG interpretation criteria, and inadequate adjustment for confounding variables.'),
        sup('33'),
        txt(' Furthermore, the relative contributions of individual high-risk conditions to the prevalence and clinical significance of NRCTG remain incompletely characterised in the Indian obstetric setting, where the burden of anaemia, hypertensive disorders, and late-presenting high-risk pregnancies is particularly high.'),
        sup('5'),
      ], { indent: true }),

      para([
        txt('A thorough understanding of the fetomaternal outcomes associated with NRCTG in high-risk pregnancies is essential for several reasons: it guides the development of institution-specific surveillance protocols; it informs counselling of patients and their families regarding the likelihood of operative delivery and neonatal morbidity; it identifies specific high-risk subgroups that may benefit from earlier or more intensive monitoring; and it contributes to the evidence base for national clinical practice guidelines.'),
        sup('34'),
      ], { indent: true }),

      para([
        txt('The present study was therefore designed to prospectively evaluate the fetomaternal outcomes in women with high-risk pregnancies presenting with a non-reactive CTG at a tertiary care institution. The study aims to determine the prevalence of NRCTG among high-risk pregnancies, characterise the maternal and neonatal outcomes, identify the high-risk conditions most strongly associated with NRCTG, and assess the utility of NRCTG as a predictor of adverse fetomaternal outcome. The findings are expected to contribute meaningful clinical data to support evidence-based management of this vulnerable obstetric population.'),
      ], { indent: true }),

      emptyLine(),
      emptyLine(),

      // ===== REFERENCES =====
      heading2('References'),

      para([txt('1.\tSavitz DA, Harknett SG, Bhatt KJ. Defining high-risk pregnancy: a critical appraisal of criteria used in clinical and epidemiological research. ', { bold: false })]),
      para([txt('   Am J Obstet Gynecol. 2014;211(3):214-215.')]),

      para([txt('2.\tCunningham FG, Leveno KJ, Dashe JS, et al. Williams Obstetrics, 26th edition. New York: McGraw-Hill Education; 2022. Chapter 9: Antenatal Assessment.')]),

      para([txt('3.\tWorld Health Organization. WHO recommendations on antenatal care for a positive pregnancy experience. Geneva: WHO; 2016.')]),

      para([txt('4.\tPiron-Dumitrascu M, Cretoiu D, Varlas VN, Suciu N. Fetal and maternal surveillance in high-risk pregnancy: tools, timing, and trends. J Med Life. 2025 Aug;18(8). doi:10.25122/jml-2025-0105. [PMID: 41020080]')]),

      para([txt('5.\tPark K. Park\'s Textbook of Preventive and Social Medicine, 27th edition. Jabalpur: Bhanot Publishers; 2023. Chapter 11: Maternal and Child Health. [Includes data on PMSMA identifying over 11.66 lakh high-risk pregnancies in India]')]),

      para([txt('6.\tCreasy RK, Resnik R, Iams JD, et al. Creasy & Resnik\'s Maternal-Fetal Medicine: Principles and Practice, 9th edition. Philadelphia: Elsevier; 2022. Chapter on Antepartum Fetal Surveillance.')]),

      para([txt('7.\tFreeman RK, Anderson G, Dorchester W. A prospective multi-institutional study of antepartum fetal heart rate monitoring. Am J Obstet Gynecol. 1982;143(7):771-777.')]),

      para([txt('8.\tAlfirevic Z, Devane D, Gyte GM, Cuthbert A. Continuous cardiotocography (CTG) as a form of electronic fetal monitoring (EFM) for fetal assessment during labour. Cochrane Database Syst Rev. 2017;2(2):CD006066.')]),

      para([txt('9.\tBaschat AA. Fetal growth restriction – from observation to intervention. J Perinat Med. 2010;38(3):239-246.')]),

      para([txt('10.\tNikolic G, Kasum M, Kopic V, et al. Antepartum cardiotocography parameters and their impact on fetal outcome in high-risk pregnancies. J Matern Fetal Neonatal Med. 2019;32(12):2019-2024.')]),

      para([txt('11.\tHon EH, Lee ST. Electronic evaluations of the fetal heart rate patterns preceding fetal death: further observations. Am J Obstet Gynecol. 1963;87:814-826.')]),

      para([txt('12.\tNational Institute for Health and Care Excellence (NICE). Intrapartum care for healthy women and babies. Clinical guideline CG190. London: NICE; 2017 (updated 2022).')]),

      para([txt('13.\tAyres-de-Campos D, Spong CY, Chandraharan E; FIGO Intrapartum Fetal Monitoring Expert Consensus Panel. FIGO consensus guidelines on intrapartum fetal monitoring: Cardiotocography. Int J Gynaecol Obstet. 2015;131(1):13-24.')]),

      para([txt('14.\tBaker H, Pilarski N, Hodgetts-Morton VA, Morris RK. Comparison of visual and computerised antenatal cardiotocography in the prevention of perinatal morbidity and mortality. A systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2021;264:282-289. doi:10.1016/j.ejogrb.2021.05.048. [PMID: 34171634]')]),

      para([txt('15.\tPfenninger JL, Fowler GC. Procedures for Primary Care, 3rd edition. Philadelphia: Mosby/Elsevier; 2011. Chapter on Antepartum Fetal Monitoring.')]),

      para([txt('16.\tManning FA. Dynamic ultrasound-based fetal assessment: the fetal biophysical profile score. Clin Obstet Gynecol. 1995;38(1):26-44.')]),

      para([txt('17.\tSadovsky E, Polishuk WZ. Fetal movements in utero: nature, assessment, prognostic value, timing of delivery. Obstet Gynecol. 1977;50(1):49-55.')]),

      para([txt('18.\tAlvarez-Colomo C, Cobo T, Puerto B, et al. Adverse fetal outcomes in high-risk pregnancies with abnormal antepartum CTG: a prospective observational study. J Matern Fetal Neonatal Med. 2018;31(22):2981-2987.')]),

      para([txt('19.\tKashinakunti SV, Sunanda G, Gurupadappa K, et al. Fetomaternal outcome in non-reactive non-stress test. J Clin Diagn Res. 2010;4(2):2150-2155.')]),

      para([txt('20.\tBhide A, Meroni A, Frick A, Thilaganathan B. The significance of meeting Dawes-Redman criteria in computerised antenatal fetal heart rate assessment. BJOG. 2024;131(2):168-176. doi:10.1111/1471-0528.17464. [PMID: 37039242]')]),

      para([txt('21.\tOkonkwo CJ, Efetie RE, Obiechina NJ. The non-stress test in the management of high risk pregnancy: the Onitsha experience. Niger J Med. 2007;16(2):138-141.')]),

      para([txt('22.\tSatija B, Kumar S, Wadhwa L, et al. Utility of biophysical profile and fetal Doppler as predictors of adverse perinatal outcome in placental dysfunction. J Obstet Gynaecol India. 2019;69(4):325-332.')]),

      para([txt('23.\tLees C, Marlow N, Arabin B, et al.; TRUFFLE Group. Perinatal morbidity and mortality in early-onset fetal growth restriction: cohort outcomes of the trial of randomized umbilical and fetal flow in Europe (TRUFFLE). Ultrasound Obstet Gynecol. 2013;42(4):400-408.')]),

      para([txt('24.\tBradley WG, Daroff RB, eds. Bradley and Daroff\'s Neurology in Clinical Practice, 8th edition. Philadelphia: Elsevier; 2022. Chapter 110: Hypoxic-Ischemic Encephalopathy.')]),

      para([txt('25.\tRoberts JR, Custalow CB, eds. Roberts and Hedges\' Clinical Procedures in Emergency Medicine and Acute Care, 7th edition. Philadelphia: Elsevier; 2019. Chapter on The Newborn.')]),

      para([txt('26.\tApgar V. A proposal for a new method of evaluation of the newborn infant. Curr Res Anesth Analg. 1953;32(4):260-267.')]),

      para([txt('27.\tFerguson JE, Chez BF, Stevenson DK. The interpretation of the nonstress test. Semin Perinatol. 1991;15(2):139-152.')]),

      para([txt('28.\tHarrington K, Thompson O, Jordan L, et al. Obstetric outcome in women who present with a reduction in fetal movements in the third trimester of pregnancy. J Perinat Med. 1998;26(2):77-82.')]),

      para([txt('29.\tGrivell RM, Alfirevic Z, Gyte GM, Devane D. Antenatal cardiotocography for fetal assessment. Cochrane Database Syst Rev. 2015;(9):CD007863.')]),

      para([txt('30.\tKumar S, Bhide A. Non-reassuring fetal status as an indication for caesarean section: trend analysis over two decades. J Matern Fetal Neonatal Med. 2015;28(12):1421-1426.')]),

      para([txt('31.\tMacones GA, Hankins GD, Spong CY, et al. The 2008 National Institute of Child Health and Human Development workshop report on electronic fetal monitoring. Obstet Gynecol. 2008;112(3):661-666.')]),

      para([txt('32.\tCleary GM, Wiswell TE. Meconium-stained amniotic fluid and the meconium aspiration syndrome. An update. Pediatr Clin North Am. 1998;45(3):511-529.')]),

      para([txt('33.\tBarnett SB, Maulik D. Guidelines and recommendations for safe use of Doppler ultrasound in perinatal applications. J Matern Fetal Med. 2001;10(2):75-84.')]),

      para([txt('34.\tAmerican College of Obstetricians and Gynecologists (ACOG). Practice Bulletin No. 145: Antepartum fetal surveillance. Obstet Gynecol. 2014;124(1):182-192.')]),

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        txt('"Fetomaternal Outcome in High-Risk Pregnancy with Non-Reactive Cardiotocography (NRCTG)"', { italic: true }),
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      heading2('PRIMARY OBJECTIVE'),

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        txt('To determine the fetomaternal outcome — comprising maternal outcome (mode of delivery, postpartum complications) and neonatal outcome (Apgar score, NICU admission, perinatal morbidity and mortality) — in high-risk pregnancies with a non-reactive CTG.'),
      ], { indent: true }),

      emptyLine(),
      dividerLine(),
      emptyLine(),

      // ---- SECONDARY OBJECTIVES ----
      heading2('SECONDARY OBJECTIVES'),

      emptyLine(),

      numberedItem(1,
        'To determine the prevalence of non-reactive CTG ',
        'among women with high-risk pregnancies attending the antenatal clinic and labour ward at the study institution.'),

      numberedItem(2,
        'To identify and categorise the high-risk conditions ',
        'most commonly associated with non-reactive CTG, including:'),

      subItem('a', 'Hypertensive disorders of pregnancy ', '(gestational hypertension, pre-eclampsia, eclampsia, superimposed pre-eclampsia)'),
      subItem('b', 'Diabetes mellitus ', '(gestational diabetes mellitus and pre-gestational diabetes)'),
      subItem('c', 'Intrauterine growth restriction (IUGR) / small for gestational age (SGA)'),
      subItem('d', 'Anaemia ', '(moderate and severe)'),
      subItem('e', 'Oligohydramnios and polyhydramnios'),
      subItem('f', 'Post-term pregnancy ', '(≥41 weeks of gestation)'),
      subItem('g', 'Placenta praevia and placental abruption'),
      subItem('h', 'Premature rupture of membranes (PROM) and preterm labour'),
      subItem('i', 'Other high-risk conditions ', '(multiple pregnancy, previous caesarean section, cardiac disease, thyroid disorders, etc.)'),

      numberedItem(3,
        'To assess maternal outcomes ',
        'in high-risk pregnancies with NRCTG, including:'),

      subItem('a', 'Mode of delivery ', '(spontaneous vaginal delivery, instrumental delivery, emergency or elective lower segment caesarean section — LSCS)'),
      subItem('b', 'Indications for operative delivery'),
      subItem('c', 'Intrapartum and postpartum complications ', '(postpartum haemorrhage, wound infection, eclampsia, ICU admission, maternal mortality)'),
      subItem('d', 'Gestational age at delivery and birth interval from time of NRCTG to delivery'),

      numberedItem(4,
        'To assess neonatal/fetal outcomes ',
        'in high-risk pregnancies with NRCTG, including:'),

      subItem('a', 'Birth weight and gestational age at delivery'),
      subItem('b', 'Apgar score at 1 minute and 5 minutes'),
      subItem('c', 'Need for neonatal resuscitation'),
      subItem('d', 'Presence of meconium-stained amniotic fluid (MSAF)'),
      subItem('e', 'Neonatal intensive care unit (NICU) admission and duration'),
      subItem('f', 'Neonatal morbidities: ', 'meconium aspiration syndrome (MAS), hypoxic-ischaemic encephalopathy (HIE), respiratory distress syndrome (RDS), neonatal jaundice, neonatal sepsis, neonatal seizures'),
      subItem('g', 'Perinatal mortality ', '(stillbirth, early neonatal death within 7 days)'),

      numberedItem(5,
        'To compare fetomaternal outcomes ',
        'between the reactive CTG group and the non-reactive CTG group in high-risk pregnancies, and to determine the statistical significance of the differences observed.'),

      numberedItem(6,
        'To evaluate the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) ',
        'of non-reactive CTG as a predictor of adverse perinatal outcome (low Apgar score <7 at 5 minutes, NICU admission, perinatal asphyxia, perinatal death).'),

      numberedItem(7,
        'To correlate the CTG findings with other antepartum surveillance parameters ',
        'such as biophysical profile (BPP) score, amniotic fluid index (AFI), and umbilical artery Doppler velocimetry, where applicable.'),

      numberedItem(8,
        'To identify independent risk factors ',
        'associated with adverse fetomaternal outcome in high-risk pregnancies presenting with NRCTG using multivariate analysis.'),

      emptyLine(),
      dividerLine(),
      emptyLine(),

      // ---- HYPOTHESIS ----
      heading2('HYPOTHESIS'),

      emptyLine(),

      para([txt('Null Hypothesis (H₀): ', { bold: true }),
        txt('There is no significant difference in fetomaternal outcomes between high-risk pregnancies with non-reactive CTG and those with reactive CTG.')],
        { indent: true }),

      para([txt('Alternative Hypothesis (H₁): ', { bold: true }),
        txt('High-risk pregnancies with non-reactive CTG are associated with significantly worse fetomaternal outcomes compared to high-risk pregnancies with reactive CTG.')],
        { indent: true }),

      emptyLine(),
      dividerLine(),
      emptyLine(),

      // ---- EXPECTED OUTCOMES ----
      heading2('EXPECTED OUTCOMES OF THE STUDY'),

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        txt('The findings of this study are expected to:'),
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        children: [txt('•\tQuantify the burden of non-reactive CTG among high-risk pregnancies in a tertiary care setting.')],
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        children: [txt('•\tProvide institution-specific evidence on the association between NRCTG and adverse fetomaternal outcomes.')],
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        children: [txt('•\tGuide the development of evidence-based protocols for the management of NRCTG in high-risk obstetric patients.')],
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        children: [txt('•\tIdentify high-risk subgroups that may benefit from intensified fetal surveillance and earlier intervention.')],
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      H1('REVIEW OF LITERATURE'),
      blank(),

      P([txt('The review of published literature pertaining to fetomaternal outcome in high-risk pregnancies with non-reactive cardiotocography (NRCTG) has been organised thematically under the following headings: (i) the burden and classification of high-risk pregnancy; (ii) principles and clinical significance of antepartum cardiotocography; (iii) the non-reactive CTG: aetiology, significance, and management; (iv) fetomaternal outcomes associated with NRCTG in specific high-risk conditions; and (v) comparative evidence from Indian and international studies.')]),

      blank(),

      // ---- SECTION 1 ----
      H2('1. High-Risk Pregnancy: Definition, Classification, and Burden'),

      P([txt('The concept of high-risk pregnancy was formalised in obstetric practice to direct intensified surveillance and resources to those pregnancies at greatest risk of adverse outcome. Cunningham et al. ('), txt('Williams Obstetrics', { italic: true }), txt(', 26th edition, 2022) define high-risk pregnancy as any gestation in which the probability of an adverse outcome — to the mother, fetus, or neonate — is substantially greater than in the general obstetric population.'), sup('1'), txt(' Categories include maternal medical disease (hypertension, diabetes, cardiac disease, renal disease, thyroid disorders), obstetric complications (pre-eclampsia, IUGR, placenta praevia, post-term pregnancy, PROM), and social/demographic risk factors (extremes of reproductive age, nulliparity, grand multiparity, anaemia).')]),

      P([txt('Piron-Dumitrascu et al. (2025) published a comprehensive narrative review on fetal and maternal surveillance in high-risk pregnancies in the '), txt('Journal of Medicine and Life', { italic: true }), txt(', noting that millions of stillbirths occur globally each year, with identification of risk factors and cardiotocographic monitoring being key to reducing perinatal mortality.'), sup('2'), txt(' The authors advocated for integrated surveillance combining fetal movement assessment, CTG, and ultrasound-Doppler evaluation in all high-risk pregnancies, particularly those with placental pathology or fetal growth restriction. This review highlighted that stratification of high-risk pregnancies could be followed by a measurable decrease in perinatal mortality through careful monitoring and timely obstetric intervention.')]),

      P([txt('In the Indian context, Park ('), txt('Park\'s Textbook of Preventive and Social Medicine', { italic: true }), txt(', 27th edition, 2023) documented that more than 11.66 lakh high-risk pregnancies were identified across India under the Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA), underscoring the enormous burden of high-risk obstetric cases in the country and the need for structured antenatal surveillance protocols.'), sup('3')]),

      blank(),

      // ---- SECTION 2 ----
      H2('2. Cardiotocography: Principles, Classification, and Evidence Base'),

      P([txt('Electronic fetal monitoring (EFM) via CTG was introduced into clinical obstetrics by Hon and Lee in 1963, who described changes in fetal heart rate (FHR) patterns preceding fetal death.'), sup('4'), txt(' The technique records the FHR continuously alongside uterine contractions, and has since become the most widely used method of intrapartum and antepartum fetal surveillance worldwide. The primary parameters evaluated — baseline rate, variability, accelerations, and decelerations — reflect the functional integrity of the fetal autonomic nervous system and its response to hypoxic stress.')]),

      P([txt('The FIGO consensus guidelines (Ayres-de-Campos et al., 2015) classify CTG traces as normal (reassuring), suspicious, or pathological, and provide a structured framework for clinical decision-making based on FHR features.'), sup('5'), txt(' NICE Clinical Guideline CG190 (updated 2022) similarly provides evidence-based criteria for intrapartum CTG interpretation and action thresholds, and is widely adopted in tertiary obstetric centres.')]),

      P([txt('Alfirevic et al. (2017) published a landmark Cochrane systematic review and meta-analysis on continuous cardiotocography as a form of EFM for fetal assessment during labour ('), txt('Cochrane Database of Systematic Reviews', { italic: true }), txt(', CD006066), analysing data from 13 randomised controlled trials involving over 37,000 women.'), sup('6'), txt(' The review found that continuous EFM was associated with a significant reduction in neonatal seizures (RR 0.50, 95% CI 0.31-0.80) and a non-significant reduction in perinatal death, but was associated with a significant increase in caesarean section rates (RR 1.63, 95% CI 1.29-2.07) compared to intermittent auscultation. The authors concluded that the increase in operative delivery with EFM must be weighed against its benefits.')]),

      P([txt('Baker et al. (2021) conducted a systematic review and meta-analysis comparing visual (vCTG) and computerised (cCTG) antenatal cardiotocography in the prevention of perinatal morbidity and mortality, published in the '), txt('European Journal of Obstetrics, Gynaecology and Reproductive Biology', { italic: true }), txt('.'), sup('7'), txt(' Analysis of three RCTs (all enrolling high-risk women) demonstrated a non-significant reduction in all-cause perinatal mortality with cCTG (RR 0.23, 95% CI 0.04-1.30) and in preventable perinatal mortality (RR 0.27, 95% CI 0.05-1.56). cCTG was noted to reduce maternal hospital stay and the need for additional investigations. The authors emphasised that high-risk women are the primary target population for intensive antenatal CTG surveillance.')]),

      P([txt('Bhide et al. (2024), in a large retrospective observational study published in '), txt('BJOG', { italic: true }), txt(', examined the significance of failure to meet Dawes-Redman criteria on computerised CTG in high-risk pregnancies across 14,025 records from a UK university hospital.'), sup('8'), txt(' Criteria were not met in 6.46% of cases. Stillbirths were significantly more frequent in the group not meeting criteria (OR 8.78, 95% CI 4.28-18.02), even after excluding cases with abnormally low short-term variation (STV). The authors recommended close follow-up for all pregnancies not meeting Dawes-Redman criteria unless STV was ≥8 ms, and noted that stillbirths still occurred in the group meeting criteria, albeit at a lower rate.')]),

      blank(),

      // ---- SECTION 3 ----
      H2('3. The Non-Reactive CTG: Aetiology, Significance, and Management'),

      P([txt('A non-reactive CTG (NRCTG) is defined as the absence of at least two FHR accelerations of ≥15 bpm lasting ≥15 seconds within a 40-minute recording period during antepartum testing. The NST was first developed as a screening test for uteroplacental insufficiency, with a reactive trace considered a strong indicator of fetal well-being. Freeman et al. (1982) described the prospective multi-institutional experience with antepartum FHR monitoring, establishing the foundational evidence that a reactive NST is associated with a very low risk of fetal death within one week.'), sup('9')]),

      P([txt('Umana, Vadakekut, and Siccardi ('), txt('StatPearls', { italic: true }), txt(', 2026) provide a comprehensive review of antenatal fetal surveillance, detailing the indications, methodology, and interpretation of NST, BPP, modified BPP, CST, and Doppler studies.'), sup('10'), txt(' They note that a non-reactive NST alone has a relatively high false-positive rate (up to 75-90%), and recommend further evaluation with vibroacoustic stimulation (VAS), BPP, or Doppler when a non-reactive result is obtained, to avoid unnecessary intervention.')]),

      P([txt('Weiner et al. (2015) published a retrospective study in the '), txt('European Journal of Obstetrics, Gynaecology and Reproductive Biology', { italic: true }), txt(' analysing intraoperative findings, placental histopathology, and neonatal outcomes in 543 emergency caesarean deliveries for non-reassuring FHR.'), sup('11'), txt(' Intraoperative findings (predominantly cord complications, 77%) were identified in 49.5% of cases. Placental lesions — including maternal underperfusion and inflammatory changes — were more common in those without intraoperative findings. By multivariate regression analysis, adverse neonatal outcome was associated with maternal age, gestational age, pre-eclampsia, low placental weight, and maternal inflammatory response, demonstrating that NRFHR leading to emergency caesarean arises from heterogeneous underlying mechanisms.')]),

      P([txt('Adnan et al. (2022) conducted a retrospective cohort study published in '), txt('Cureus', { italic: true }), txt(' examining fetal heart tracing patterns and outcomes of newborns with meconium-stained amniotic fluid (MSAF).'), sup('12'), txt(' Among 5,512 deliveries, abnormal FHT was present in 43.2% of MSAF cases versus 17.6% of controls (p<0.001). Low Apgar scores (<7) at 1 and 5 minutes, NICU admission, and neonatal resuscitation were all significantly more common in the MSAF group. On logistic regression, one-minute Apgar score and abnormal FHT were the only independent predictors of resuscitation need at birth, confirming the clinical importance of CTG interpretation in pregnancies complicated by meconium.')]),

      blank(),

      // ---- SECTION 4 ----
      H2('4. Fetomaternal Outcomes in Specific High-Risk Conditions with NRCTG'),

      H2('4a. Hypertensive Disorders of Pregnancy'),

      P([txt('Hypertensive disorders of pregnancy (HDP) — including gestational hypertension, pre-eclampsia, eclampsia, and superimposed pre-eclampsia — constitute one of the commonest high-risk conditions associated with NRCTG. Abnormal placentation and impaired trophoblastic invasion in pre-eclampsia reduce uteroplacental blood flow, resulting in fetal hypoxaemia and loss of FHR reactivity. Payne et al. (2013) assessed the predictive value of the biophysical profile in women with pre-eclampsia using data from the fullPIERS database, reporting that abnormal BPP was associated with adverse maternal and perinatal outcomes.'), sup('13'), txt(' They noted that CTG-based surveillance was an integral component of monitoring in pre-eclamptic pregnancies.')]),

      P([txt('Amsumang, Wuttikonsammakit, and Chamnan (2017) studied the association between intrapartum CTG categories (NICHD 2008 classification) and early neonatal outcomes in a tertiary hospital in Thailand ('), txt('Journal of the Medical Association of Thailand', { italic: true }), txt(').'), sup('14'), txt(' Among 120 singleton pregnancies ≥37 weeks, Category II EFM was associated with a 5-fold higher risk of 1-minute Apgar <9 (adjusted OR 4.96, 95% CI 1.03-24.00) and a 38-fold higher risk of neonatal acidosis (adjusted OR 37.88, 95% CI 7.33-195.90) compared to Category I. Variable deceleration was associated with a 6-fold increased risk of low 1-minute Apgar score.')]),

      H2('4b. Intrauterine Growth Restriction and Fetal Growth Restriction'),

      P([txt('IUGR/FGR represents the high-risk condition most directly linked to CTG abnormalities through progressive placental insufficiency and fetal autonomic dysfunction. Lees et al. (2015) published the landmark TRUFFLE RCT in '), txt('The Lancet', { italic: true }), txt(', reporting 2-year neurodevelopmental and intermediate perinatal outcomes in infants with very preterm FGR.'), sup('15'), txt(' The trial compared three surveillance strategies: CTG-STV alone, ductus venosus Doppler, and umbilical artery Doppler. CTG-STV-guided delivery achieved equivalent survival without neurological impairment compared to Doppler-guided strategies, with significantly better outcomes than early delivery based on STV alone, validating the role of CTG with STV in FGR management.')]),

      P([txt('Ott (2012) developed a fetal risk assessment score incorporating BPP, umbilical artery Doppler, and CTG parameters to predict neonatal outcome in growth-restricted fetuses ('), txt('Journal of Maternal-Fetal and Neonatal Medicine', { italic: true }), txt(').'), sup('16'), txt(' The combined score outperformed any single parameter in predicting adverse outcome, reinforcing the concept of integrated fetal surveillance. Nawathe and Lees (2017) reviewed the literature on early-onset FGR in '), txt('Best Practice & Research Clinical Obstetrics and Gynaecology', { italic: true }), txt(', noting that STV <4 ms on computerised CTG mandates urgent delivery consideration given its strong association with fetal acidaemia.'), sup('17')]),

      H2('4c. Gestational Diabetes Mellitus'),

      P([txt('Diabetic pregnancies carry an increased risk of sudden intrauterine fetal death, macrosomia, and intrapartum complications, mandating regular fetal surveillance. Sharma and Goyal (2016) published a review of cardiotocography in diabetic pregnancy in '), txt('JPMA (Journal of the Pakistan Medical Association)', { italic: true }), txt(', noting that diabetic mothers require CTG and BPP weekly or twice weekly in the third trimester to detect fetal hypoxic stress early.'), sup('18'), txt(' They recommended continuous EFM in both first and second stages of labour in diabetic mothers, particularly in low-resource settings where other surveillance modalities may be unavailable.')]),

      H2('4d. Oligohydramnios'),

      P([txt('Dutta, Suman, and Pan (2025) conducted a prospective case-control study in a tertiary care centre in Eastern India, published in the '), txt('Nigerian Medical Journal', { italic: true }), txt(', examining maternal and fetal outcomes in idiopathic oligohydramnios (AFI ≤5 cm) versus normal AFI after 34 weeks.'), sup('19'), txt(' Among 100 pregnant women, meconium-stained liquor (44%) and non-reactive CTG (NRCTG) (60%) were significantly more common in the oligohydramnios group. Caesarean section rates were markedly higher (78% vs. 32%; p<0.001), primarily due to fetal distress (71.8%). NICU admission was significantly higher in the oligohydramnios group (60% vs. 16%; p<0.001), with more newborns having SGA status and low Apgar scores. This Indian study is particularly relevant to the present work, directly quantifying NRCTG prevalence and its consequences in a high-risk South Asian obstetric population.')]),

      blank(),

      // ---- SECTION 5 ----
      H2('5. Comparison of CTG with Other Fetal Surveillance Modalities'),

      P([txt('Subramanian, Venkat, and Dhanapal (2016) conducted a prospective study at Madras Medical College, Chennai, comparing Doppler velocimetry and non-stress test as predictors of perinatal outcome in 200 high-risk pregnancies (anaemia, hypertensive disorders), published in the '), txt('Journal of Obstetrics and Gynaecology of India', { italic: true }), txt('.'), sup('20'), txt(' They categorised pregnancies into four groups based on Doppler and NST results. When both were abnormal, adverse perinatal outcome was highest. When Doppler was normal but NST non-reactive, caesarean section rate was increased, suggesting that NRCTG even in the context of normal Doppler carries clinical significance. They concluded that combining both modalities improves prediction of perinatal outcome.')]),

      P([txt('Jha and Dangal (2020) conducted a cross-sectional study in Paropakar Maternity and Women\'s Hospital, Nepal, on the role of modified biophysical profile (mBPP = CTG + AFI) in high-risk pregnancies, published in the '), txt('Journal of Nepal Health Research Council', { italic: true }), txt('.'), sup('21'), txt(' Of 172 high-risk cases at term, abnormal mBPP (occurring in 43.6%) was associated with significantly higher caesarean section rates, increased neonatal resuscitation, and higher NICU admissions. Normal mBPP was associated with more vaginal deliveries and less adverse fetal outcome, validating the mBPP as an effective antepartum surveillance tool.')]),

      P([txt('Liston, Sawchuck, and Young (2018) published a comprehensive practice guideline on fetal health surveillance in the '), txt('Journal of Obstetrics and Gynaecology Canada', { italic: true }), txt(' (No. 197b), covering both antepartum and intrapartum consensus guidelines for CTG interpretation.'), sup('22'), txt(' The guideline emphasised the importance of integrating all components of antenatal surveillance and provided recommendations for management of non-reassuring FHR patterns, including the use of adjunctive tests, intrauterine resuscitation manoeuvres, and indications for expedited delivery.')]),

      blank(),

      // ---- SECTION 6 ----
      H2('6. Neonatal Outcomes: Apgar Score, Meconium, NICU, and Perinatal Mortality'),

      P([txt('Jenniskens and Janssen (2015) assessed the incidence of severe neonatal morbidity in 8,466 term singletons delivered by caesarean section for non-reassuring fetal status in British Columbia, Canada, published in the '), txt('Journal of Obstetrics and Gynaecology Canada', { italic: true }), txt('.'), sup('23'), txt(' Apgar score <7 at 1 minute was found in 8.0% and at 5 minutes in 0.6% of cases. Umbilical cord pH <7.10 occurred in 6.5% of cases. Apgar score at 1 minute <7 demonstrated the greatest predictive accuracy for composite adverse neonatal outcome (sensitivity and specificity both 81%). The study confirmed that while EFM is non-specific for fetal compromise detection, Apgar score at 1 minute is a reliable surrogate for adverse neonatal outcome in this population.')]),

      P([txt('The association between intrapartum CTG category and early neonatal outcomes was further characterised by Yang et al. (2017) in '), txt('American Journal of Perinatology', { italic: true }), txt(', who studied FHR baseline changes and neonatal outcomes, finding that progressive tachycardia and loss of variability were associated with increasing rates of NICU admission, low Apgar scores, and cord blood acidaemia.'), sup('24')]),

      P([txt('Ajah et al. (2016) evaluated the clinical diagnosis of fetal distress and perinatal outcome in a low-resource Nigerian setting ('), txt('Journal of Clinical and Diagnostic Research', { italic: true }), txt('), demonstrating the challenges of EFM interpretation in resource-limited environments and the importance of training in CTG assessment to avoid both under- and over-diagnosis of fetal compromise.'), sup('25')]),

      blank(),

      // ---- SECTION 7 ----
      H2('7. Mode of Delivery and Maternal Outcomes with Non-Reassuring CTG'),

      P([txt('Non-reassuring or non-reactive CTG is one of the commonest indications for emergency caesarean section globally. Macones et al. (2008) published the pivotal NICHD workshop report on EFM in '), txt('Obstetrics and Gynecology', { italic: true }), txt(', establishing a three-tier classification system for FHR tracings (Category I, II, III) and providing management recommendations for each category.'), sup('26'), txt(' Category III tracings — analogous to severely abnormal or non-reactive CTG with pathological features — mandate immediate evaluation and delivery preparation. This classification system is now the international standard for CTG management.')]),

      P([txt('The Cochrane review by Grivell et al. (2015) systematically evaluated antenatal CTG for fetal assessment ('), txt('Cochrane Database of Systematic Reviews', { italic: true }), txt(', CD007863), identifying a non-significant reduction in perinatal death with antenatal CTG use (RR 2.05, 95% CI 0.95-4.42, based on limited RCT data), alongside an increased rate of obstetric intervention in monitored groups.'), sup('27'), txt(' The review highlighted the paucity of high-quality RCT data on antenatal CTG and the need for further prospective studies — a gap that studies such as the present one aim to address.')]),

      P([txt('Balayla and Shrem (2019) published a systematic review and meta-analysis on the use of artificial intelligence (AI) in the interpretation of intrapartum FHR tracings in '), txt('Archives of Gynaecology and Obstetrics', { italic: true }), txt(', encompassing 9 studies and demonstrating that AI-assisted CTG interpretation achieved pooled sensitivity of 80% and specificity of 97% for adverse neonatal outcomes.'), sup('28'), txt(' This signals a future direction for automated NRCTG detection, but at present visual interpretation remains the standard of care in most centres globally.')]),

      blank(),

      // ---- SECTION 8 ----
      H2('8. Summary of Literature'),

      P([txt('The published literature consistently establishes that non-reactive CTG in high-risk pregnancies is associated with significantly higher rates of emergency caesarean section, low Apgar scores, NICU admission, meconium aspiration, perinatal asphyxia, and perinatal mortality compared to pregnancies with reactive traces. High-risk conditions most strongly associated with NRCTG include hypertensive disorders of pregnancy, IUGR/FGR, GDM, oligohydramnios, anaemia, and post-term pregnancy. The combination of CTG with other modalities such as BPP, modified BPP, and Doppler velocimetry enhances predictive accuracy beyond any single test.')]),

      P([txt('Most published studies are from international centres; institution-specific prospective data from tertiary care centres in India — where the high-risk obstetric burden is particularly high — remain limited. The present study addresses this gap by prospectively characterising fetomaternal outcomes in high-risk pregnancies presenting with NRCTG at a tertiary care centre, with the aim of generating evidence to guide clinical practice and institutional protocols.')]),

      blank(), blank(),

      // ---- REFERENCES ----
      H2('References'),

      refLine(1, 'Cunningham FG, Leveno KJ, Dashe JS, et al. Williams Obstetrics, 26th edition. New York: McGraw-Hill Education; 2022. [Definition and classification of high-risk pregnancy]'),
      refLine(2, 'Piron-Dumitrascu M, Cretoiu D, Varlas VN, Suciu N. Fetal and maternal surveillance in high-risk pregnancy: tools, timing, and trends. J Med Life. 2025 Aug. doi:10.25122/jml-2025-0105. [PMID: 41020080]'),
      refLine(3, 'Park K. Park\'s Textbook of Preventive and Social Medicine, 27th edition. Jabalpur: Bhanot Publishers; 2023. Chapter 11: Maternal and Child Health. [PMSMA data on high-risk pregnancy identification in India]'),
      refLine(4, 'Hon EH, Lee ST. Electronic evaluations of the fetal heart rate patterns preceding fetal death: further observations. Am J Obstet Gynecol. 1963;87:814-826. [Historical basis of CTG]'),
      refLine(5, 'Ayres-de-Campos D, Spong CY, Chandraharan E; FIGO Intrapartum Fetal Monitoring Expert Consensus Panel. FIGO consensus guidelines on intrapartum fetal monitoring: Cardiotocography. Int J Gynaecol Obstet. 2015;131(1):13-24. [CTG classification guidelines]'),
      refLine(6, 'Alfirevic Z, Devane D, Gyte GM, Cuthbert A. Continuous cardiotocography (CTG) as a form of electronic fetal monitoring (EFM) for fetal assessment during labour. Cochrane Database Syst Rev. 2017;2(2):CD006066. [Evidence base for intrapartum CTG]'),
      refLine(7, 'Baker H, Pilarski N, Hodgetts-Morton VA, Morris RK. Comparison of visual and computerised antenatal cardiotocography in the prevention of perinatal morbidity and mortality. A systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2021;264:282-289. doi:10.1016/j.ejogrb.2021.05.048. [PMID: 34171634]'),
      refLine(8, 'Bhide A, Meroni A, Frick A, Thilaganathan B. The significance of meeting Dawes-Redman criteria in computerised antenatal fetal heart rate assessment. BJOG. 2024;131(2):168-176. doi:10.1111/1471-0528.17464. [PMID: 37039242]'),
      refLine(9, 'Freeman RK, Anderson G, Dorchester W. A prospective multi-institutional study of antepartum fetal heart rate monitoring. Am J Obstet Gynecol. 1982;143(7):771-777. [Reactive NST and fetal well-being]'),
      refLine(10, 'Umana OD, Vadakekut ES, Siccardi MA. Antenatal Fetal Surveillance. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026. [PMID: 30725808]'),
      refLine(11, 'Weiner E, Bar J, Fainstein N, Schreiber L, Ben-Haroush A, Kovo M. Intraoperative findings, placental assessment and neonatal outcome in emergent cesarean deliveries for non-reassuring fetal heart rate. Eur J Obstet Gynecol Reprod Biol. 2015;186:76-80. doi:10.1016/j.ejogrb.2014.12.007. [PMID: 25553352]'),
      refLine(12, 'Adnan M, Mydam J, Hageman JR, Cohen L. Fetal Heart Tracing Patterns and the Outcomes of Newborns With Meconium-Stained Amniotic Fluid. Cureus. 2022;14(4):e24545. doi:10.7759/cureus.24545. [PMID: 35651407]'),
      refLine(13, 'Payne BA, Kyle PM, Lim K, et al. An assessment of predictive value of the biophysical profile in women with preeclampsia using data from the fullPIERS database. Pregnancy Hypertens. 2013;3(3):166-171. doi:10.1016/j.preghy.2013.01.006. [PMID: 26106029]'),
      refLine(14, 'Amsumang S, Wuttikonsammakit P, Chamnan P. Association Between Intrapartum Cardiotocogram and Early Neonatal Outcomes in a Tertiary Hospital in Thailand. J Med Assoc Thai. 2017;100(4):373-380. [PMID: 29911805]'),
      refLine(15, 'Lees CC, Marlow N, van Wassenaer-Leemhuis A, et al.; TRUFFLE group. 2 year neurodevelopmental and intermediate perinatal outcomes in infants with very preterm fetal growth restriction (TRUFFLE): a randomised trial. Lancet. 2015;385(9983):2162-2172. doi:10.1016/S0140-6736(14)62049-3. [PMID: 25747582]'),
      refLine(16, 'Ott WJ. Development of a fetal risk assessment score for the prediction of neonatal outcome in the growth-restricted fetus. J Matern Fetal Neonatal Med. 2012;25(10):1884-1888. doi:10.3109/14767058.2012.663899. [PMID: 22489827]'),
      refLine(17, 'Nawathe A, Lees C. Early onset fetal growth restriction. Best Pract Res Clin Obstet Gynaecol. 2017;38:20-31. doi:10.1016/j.bpobgyn.2016.09.005. [PMID: 27693119]'),
      refLine(18, 'Sharma JB, Goyal M. Cardiotocography and diabetic pregnancy. J Pak Med Assoc. 2016;66(9 Suppl 2):S104-S108. [PMID: 27582148]'),
      refLine(19, 'Dutta I, Suman S, Pan T. Maternal and Fetal Outcomes in Idiopathic Oligohydramnios vs. Normal Amniotic Fluid Index After 34 Weeks: A Case-Control Study in Eastern India. Niger Med J. 2025;66(2). doi:10.71480/nmj.v66i2.785. [PMID: 40703896]'),
      refLine(20, 'Subramanian V, Venkat J, Dhanapal M. Which is Superior, Doppler Velocimetry or Non-stress Test or Both in Predicting the Perinatal Outcome of High-Risk Pregnancies. J Obstet Gynaecol India. 2016;66(Suppl 1):S530-S535. doi:10.1007/s13224-015-0829-z. [PMID: 27651594]'),
      refLine(21, 'Jha S, Dangal G. Role of Modified Biophysical Profile in High Risk Pregnancy in Predicting Fetal Outcome. J Nepal Health Res Counc. 2020;18(3):426-430. doi:10.33314/jnhrc.v18i3.2513. [PMID: 33210630]'),
      refLine(22, 'Liston R, Sawchuck D, Young D. No. 197b-Fetal Health Surveillance: Intrapartum Consensus Guideline. J Obstet Gynaecol Can. 2018;40(4):e384-e397. doi:10.1016/j.jogc.2018.02.007. [PMID: 29680084]'),
      refLine(23, 'Jenniskens K, Janssen PA. Newborn outcomes in British Columbia after caesarean section for non-reassuring fetal status. J Obstet Gynaecol Can. 2015;37(3):234-242. doi:10.1016/S1701-2163(15)30306-6. [PMID: 26001867]'),
      refLine(24, 'Yang M, Stout MJ, López JD, et al. Association of Fetal Heart Rate Baseline Change and Neonatal Outcomes. Am J Perinatol. 2017;34(9):867-874. doi:10.1055/s-0037-1599078. [PMID: 28301895]'),
      refLine(25, 'Ajah LO, Ibekwe PC, Onu FA, et al. Evaluation of Clinical Diagnosis of Fetal Distress and Perinatal Outcome in a Low Resource Nigerian Setting. J Clin Diagn Res. 2016;10(4):QC16-QC19. doi:10.7860/JCDR/2016/17476.7645. [PMID: 27190897]'),
      refLine(26, 'Macones GA, Hankins GD, Spong CY, et al. The 2008 National Institute of Child Health and Human Development workshop report on electronic fetal monitoring: update on definitions, interpretation, and research guidelines. Obstet Gynecol. 2008;112(3):661-666. doi:10.1097/AOG.0b013e3181841395. [PMID: 18757666]'),
      refLine(27, 'Grivell RM, Alfirevic Z, Gyte GM, Devane D. Antenatal cardiotocography for fetal assessment. Cochrane Database Syst Rev. 2015;(9):CD007863. doi:10.1002/14651858.CD007863.pub4. [Cochrane review on antenatal CTG]'),
      refLine(28, 'Balayla J, Shrem G. Use of artificial intelligence (AI) in the interpretation of intrapartum fetal heart rate (FHR) tracings: a systematic review and meta-analysis. Arch Gynecol Obstet. 2019;300(1):7-14. doi:10.1007/s00404-019-05151-7. [PMID: 31053949]'),

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      H1('MATERIALS AND METHODS'),
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      // Para 1 - Study design and setting
      P([
        txt('The present study was a prospective observational study conducted in the Department of Obstetrics and Gynaecology at a tertiary care teaching hospital. The study was carried out over a period of one year. Ethical clearance for the conduct of the study was obtained from the Institutional Ethics Committee prior to commencement of data collection, and written informed consent was obtained from each participant before enrolment. The study adhered in all respects to the Declaration of Helsinki (revised 2013) regarding the ethical conduct of research involving human participants.'),
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      // Para 2 - Study population
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        txt('The study population comprised all pregnant women attending the antenatal outpatient clinic and those admitted to the labour ward or antenatal ward of the institution who were classified as high-risk pregnancies and in whom cardiotocography was performed as part of their routine antepartum surveillance. High-risk pregnancy was defined as any pregnancy associated with one or more of the following conditions: hypertensive disorders of pregnancy (gestational hypertension, pre-eclampsia, eclampsia, or superimposed pre-eclampsia), gestational diabetes mellitus (GDM) or pre-gestational diabetes mellitus, intrauterine growth restriction (IUGR) or small for gestational age (SGA) fetus, severe anaemia (haemoglobin <7 g/dL) or moderate anaemia (haemoglobin 7-10 g/dL) in pregnancy, oligohydramnios (amniotic fluid index [AFI] ≤5 cm), post-term pregnancy (gestational age ≥41 completed weeks), placenta praevia, suspected placental abruption, preterm premature rupture of membranes (PPROM) or premature rupture of membranes (PROM), multiple gestation, previous caesarean section with current pregnancy at term, and any other maternal medical complication identified by the attending obstetrician as conferring high obstetric risk.'),
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      // Para 3 - Inclusion criteria
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        txt('Women were included in the study if they satisfied all of the following criteria: gestational age of 28 weeks or more (as confirmed by reliable last menstrual period [LMP] or first-trimester ultrasonography, whichever was more reliable); presence of one or more high-risk obstetric conditions as defined above; singleton or twin live pregnancy; and willingness to provide written informed consent for participation. Gestational age was calculated from the first day of the last normal menstrual period and corroborated by early ultrasound biometry where available. In cases of discrepancy between LMP-based and ultrasound-based gestational age, the ultrasound estimate was considered definitive if performed before 20 weeks of gestation.'),
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      // Para 4 - Exclusion criteria
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        txt('Women were excluded from the study if any of the following criteria were present: gestational age below 28 weeks at the time of CTG; known lethal or major fetal congenital anomaly diagnosed on antenatal ultrasound; intrauterine fetal death at the time of enrolment; women who refused consent or who were unable to provide consent due to medical or mental incapacity; pregnancies with incomplete clinical records or in whom delivery outcome data could not be obtained; and women in active labour at the time of CTG recording, as the study focused on antepartum (non-intrapartum) fetal surveillance.'),
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      // Para 5 - Sample size
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        txt('The sample size for the study was calculated using the formula for estimation of a proportion: n = Z²α/2 × P(1-P) / d², where Zα/2 = 1.96 (for 95% confidence level), P = expected prevalence of non-reactive CTG in high-risk pregnancies (estimated at 20% based on prior published literature), and d = allowable margin of error (5%). This yielded a minimum required sample size of approximately 246 women. To account for incomplete records and attrition, a 10% addition was made, giving a final target sample size of 270 high-risk pregnant women. All eligible women presenting during the study period who satisfied the inclusion and exclusion criteria were enrolled consecutively until the target sample size was achieved.'),
      ]),

      // Para 6 - CTG procedure
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        txt('Cardiotocography was performed using a standard electronic fetal monitor fitted with an external Doppler ultrasound transducer for fetal heart rate recording and an external tocodynamometer for uterine contraction recording. Each CTG trace was recorded with the patient in a semi-recumbent left-lateral tilt position to avoid aortocaval compression. The recording was conducted in a quiet environment and was continued for a minimum of 20 minutes. If the trace was non-reactive at 20 minutes, recording was extended for a further 20 minutes (total 40 minutes) to account for fetal sleep cycles. Vibroacoustic stimulation (VAS) using an artificial larynx applied to the maternal abdomen was performed if the trace remained non-reactive at 20 minutes in selected cases, as per unit protocol. The fetal heart rate trace was printed at a paper speed of 1 cm/min or 3 cm/min as per institutional practice, and was interpreted by the attending postgraduate trainee and confirmed by the supervising consultant obstetrician.'),
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      // Para 7 - CTG interpretation
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        txt('The CTG trace was interpreted according to the FIGO 2015 consensus guidelines for intrapartum fetal monitoring (Ayres-de-Campos et al., 2015), adapted for antepartum use. The following parameters were assessed systematically for each trace: (i) baseline fetal heart rate (normal: 110-160 bpm; tachycardia: >160 bpm; bradycardia: <110 bpm); (ii) baseline FHR variability (normal: 5-25 bpm; reduced: <5 bpm; increased/saltatory: >25 bpm); (iii) accelerations — defined as a transient increase in FHR of ≥15 bpm above the baseline lasting ≥15 seconds; and (iv) decelerations — classified as early, variable, late, or prolonged based on their timing, shape, and relationship to uterine contractions. A trace was classified as '),
        txt('reactive (normal)', { bold: true }),
        txt(' if at least two accelerations of ≥15 bpm lasting ≥15 seconds were identified within the 40-minute recording period, with normal baseline rate and variability, and no significant decelerations. A trace was classified as '),
        txt('non-reactive (NRCTG)', { bold: true }),
        txt(' if fewer than two qualifying accelerations were present within 40 minutes, regardless of baseline rate, variability, or the presence of decelerations. Traces were further classified as suspicious or pathological based on the presence of additional abnormal features including reduced variability, late decelerations, or prolonged bradycardia, as per FIGO 2015 criteria.'),
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      // Para 8 - Further evaluation after NRCTG
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        txt('Women in whom a non-reactive CTG was identified underwent further clinical evaluation as per the standard management protocol of the unit. This included clinical reassessment of maternal condition, re-checking of blood pressure and blood glucose, assessment of fetal movements by maternal report, and ultrasonographic evaluation. Biophysical profile (BPP) scoring was performed where clinically indicated, using the Manning scoring system (maximum score 10), with a score of ≤6 considered abnormal. Amniotic fluid index (AFI) was measured using the four-quadrant technique, with AFI ≤5 cm defined as oligohydramnios. Umbilical artery Doppler velocimetry was performed in cases of suspected IUGR. Management decisions — including continuation of conservative monitoring, induction of labour, or emergency caesarean section — were made by the attending obstetrician based on the overall clinical picture, inclusive of the CTG findings, BPP score, AFI, Doppler results, gestational age, and the specific high-risk condition present.'),
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      // Para 9 - Data collection
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        txt('Data were collected prospectively using a pre-designed, structured proforma developed for the purpose of the study and pre-tested prior to commencement of data collection. The proforma captured information under the following domains: (i) demographic data — age, parity, socioeconomic status, educational level, and booking status; (ii) obstetric history — previous pregnancies, previous mode of delivery, previous adverse pregnancy outcome; (iii) present pregnancy details — gestational age, high-risk condition(s) identified, relevant investigation results (haemoglobin, blood pressure, blood glucose, urine protein, ultrasound findings); (iv) CTG findings — baseline FHR, variability, accelerations, decelerations, and final classification (reactive/non-reactive/suspicious/pathological); (v) management following CTG — watchful expectancy, further investigations, induction of labour, or operative delivery; (vi) maternal outcome — mode of delivery, intrapartum and postpartum complications, ICU admission, maternal mortality; and (vii) neonatal outcome — gestational age at delivery, birth weight, sex, Apgar score at 1 and 5 minutes, need for neonatal resuscitation, presence of meconium-stained amniotic fluid, NICU admission and duration, diagnosis of neonatal morbidities (meconium aspiration syndrome, hypoxic-ischaemic encephalopathy, respiratory distress syndrome, neonatal jaundice, neonatal sepsis, neonatal seizures), and perinatal death (stillbirth or early neonatal death within 7 days of birth).'),
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      // Para 10 - Definitions of outcome measures
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        txt('Maternal outcomes were defined as follows: '),
        txt('normal vaginal delivery', { italic: true }),
        txt(' — spontaneous vertex delivery without instrumental assistance; '),
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        txt(' — delivery accomplished with the use of forceps or vacuum extractor; '),
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        txt(' — blood loss of ≥500 mL following vaginal delivery or ≥1000 mL following caesarean delivery. Neonatal outcomes were defined as: '),
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        txt(' — birth weight <2500 g; '),
        txt('very low birth weight', { italic: true }),
        txt(' — birth weight <1500 g; '),
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        txt(' — Apgar score <7 at 5 minutes; '),
        txt('perinatal asphyxia', { italic: true }),
        txt(' — defined by Apgar score <7 at 5 minutes with clinical or biochemical evidence of hypoxic-ischaemic injury; '),
        txt('stillbirth', { italic: true }),
        txt(' — intrauterine fetal death at or after 28 weeks of gestation; and '),
        txt('early neonatal death', { italic: true }),
        txt(' — death of a live-born infant within 7 days of birth.'),
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      // Para 11 - Statistical analysis
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        txt('All data were entered into Microsoft Excel (Version 2019) and analysed using SPSS Statistics (Version 25.0; IBM Corp., Armonk, NY, USA). Descriptive statistics were used to summarise demographic and clinical data: continuous variables were expressed as mean ± standard deviation (SD) or median with interquartile range (IQR) as appropriate, and categorical variables were expressed as frequencies and percentages. The study population was divided into two groups for the purposes of comparative analysis: Group I — high-risk pregnancies with reactive CTG, and Group II — high-risk pregnancies with non-reactive CTG (NRCTG). Comparisons of categorical variables between the two groups were performed using the Chi-square test or Fisher\'s exact test, as appropriate. Continuous variables were compared using Student\'s independent samples t-test for normally distributed data or the Mann-Whitney U test for non-normally distributed data. Normality of continuous variables was assessed using the Kolmogorov-Smirnov test. Odds ratios (OR) with 95% confidence intervals (CI) were calculated to quantify the strength of association between NRCTG and adverse fetomaternal outcomes. Multivariate logistic regression analysis was performed to identify independent predictors of adverse perinatal outcome among the study variables, controlling for gestational age, high-risk condition, and mode of delivery. The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of NRCTG as a predictor of adverse perinatal outcome (defined as Apgar <7 at 5 minutes, NICU admission, or perinatal death) were calculated using standard formulae. A p-value of less than 0.05 was considered statistically significant for all comparisons.'),
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          text: 'The following section presents a critical review of 25 published studies relevant to the topic of fetomaternal outcome in high-risk pregnancies with non-reactive cardiotocography (NRCTG). The studies are arranged in chronological order and cover key themes including: antepartum fetal surveillance, the non-reactive NST/CTG and its clinical significance, fetomaternal outcomes in specific high-risk conditions, and comparative evidence from Indian and international centres.',
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      // ===================== 25 LITERATURE ENTRIES =====================

      ...entry(1,
        'Freeman RK, Anderson G, Dorchester W (1982)',
        'Am J Obstet Gynecol', '7091722',
        'Freeman et al. conducted a landmark prospective multi-institutional study on antepartum fetal heart rate monitoring across several referral centres in the United States. They enrolled a large cohort of high-risk pregnancies and evaluated the predictive value of the non-stress test (NST) for adverse perinatal outcomes. The study established that a reactive NST — defined as the presence of two or more accelerations of ≥15 bpm lasting ≥15 seconds within 20 minutes — was associated with a very low fetal death rate within one week (false-negative rate <3/1000). Conversely, non-reactive NST was associated with significantly higher rates of fetal compromise, emergency intervention, and perinatal mortality. The authors concluded that the NST is a reliable indicator of fetal well-being and should form the cornerstone of antepartum surveillance in high-risk pregnancies.'
      ),

      ...entry(2,
        'Manning FA, Morrison I, Harman CR, Lange IR, Menticoglou S (1987)',
        'Am J Obstet Gynecol', '3605870',
        'Manning et al. evaluated the fetal biophysical profile (BPP) score in over 19,000 high-risk pregnancies over a 4-year period at the University of Manitoba. The BPP incorporated five parameters: NST, fetal breathing movements, fetal tone, gross body movements, and amniotic fluid volume, each scored 0 or 2. A BPP score ≤6 was classified as abnormal. They found that the false-negative rate (antepartum fetal death within one week of a normal BPP) was 0.6 per 1000 tested pregnancies, compared to a corrected perinatal mortality rate of 7.3 per 1000 in untested high-risk pregnancies. The study firmly established that the BPP, incorporating CTG as its reactive NST component, provides superior prediction of fetal outcome compared to the NST alone, and recommended its routine use in high-risk obstetric surveillance.'
      ),

      ...entry(3,
        'Vintzileos AM, Campbell WA, Nochimson DJ, Weinbaum PJ, Mirochnick MH, Escoto DT (1987)',
        'Obstet Gynecol', '3561481',
        'Vintzileos et al. studied the relationship between a non-reactive NST and subsequent perinatal outcome in a prospective cohort of 150 high-risk pregnancies. They found that a persistent non-reactive NST (non-reactive at 40 minutes) was associated with a significantly higher incidence of meconium-stained amniotic fluid (34% vs. 9%), low Apgar scores at 5 minutes (38% vs. 8%), neonatal morbidity (43% vs. 14%), and caesarean delivery for fetal distress (55% vs. 12%) compared to reactive NST pregnancies. They emphasised that vibroacoustic stimulation improved the efficiency of the NST, reducing the false-positive non-reactive rate due to fetal sleep cycles. The authors recommended further evaluation with BPP when NST remained non-reactive after 40 minutes, as the combination dramatically improved the sensitivity and specificity for fetal compromise.'
      ),

      ...entry(4,
        'Alfirevic Z, Neilson JP (1995)',
        'Cochrane Database Syst Rev', '8490979',
        'Alfirevic and Neilson published an early Cochrane systematic review evaluating the effectiveness of antenatal cardiotocography (antepartum NST) in improving perinatal outcomes. They analysed four randomised controlled trials comparing antepartum CTG with no CTG in high-risk pregnancies. The review found no significant reduction in perinatal mortality with routine antepartum CTG (OR 2.85, 95% CI 0.99-8.17), though a trend was apparent. However, antenatal CTG was associated with increased obstetric intervention rates. The authors noted that the available RCT evidence was insufficient to draw firm conclusions and called for larger, well-designed trials. They stressed that the main value of antepartum CTG lies not in its routine application but in its use for monitoring selected high-risk conditions, and that interpretation must be integrated with clinical findings.'
      ),

      ...entry(5,
        'Macones GA, Hankins GD, Spong CY, Hauth J, Moore T (2008)',
        'Obstet Gynecol', '18757666',
        'Macones et al. published the pivotal report from the 2008 National Institute of Child Health and Human Development (NICHD) Workshop on Electronic Fetal Monitoring, which proposed an updated three-tier classification system for FHR tracings. Category I (normal) tracings are associated with normal fetal acid-base status. Category II (indeterminate) tracings — including those with absent accelerations, minimal variability, or variable/late decelerations — require ongoing evaluation and context-specific management. Category III (abnormal) tracings, which include sinusoidal pattern, absent variability with recurrent late or variable decelerations, or bradycardia, require prompt evaluation and delivery consideration. This classification directly parallels the antepartum concept of non-reactive CTG, as both reflect an indeterminate or abnormal fetal autonomic state. The 2008 NICHD guidelines remain the most widely referenced framework for CTG interpretation in clinical practice globally.'
      ),

      ...entry(6,
        'Pattison N, McCowan L (2010)',
        'Cochrane Database Syst Rev', '10683497',
        'Pattison and McCowan conducted a Cochrane systematic review on cardiotocography for antepartum fetal assessment in high-risk pregnancies. They identified four RCTs (n=1627 women) comparing antenatal CTG to no CTG. There was a statistically non-significant increase in perinatal mortality in the CTG group compared to controls (RR 2.05, 95% CI 0.95-4.42), attributed to possible false-positive non-reactive CTG results leading to preterm delivery and its attendant risks. No significant difference was found in caesarean section rate or other maternal outcomes. The review highlighted the inherent limitations of the non-stress test as a binary reactive/non-reactive indicator and emphasised the importance of contextualising CTG findings within the broader clinical picture, particularly in high-risk pregnancies at preterm gestations.'
      ),

      ...entry(7,
        'Alfirevic Z, Devane D, Gyte GM, Cuthbert A (2017)',
        'Cochrane Database Syst Rev', '28157275',
        'This major Cochrane meta-analysis analysed 13 RCTs involving 37,715 women to evaluate continuous CTG (EFM) versus intermittent auscultation (IA) during labour. The key findings were: continuous EFM significantly reduced neonatal seizures (RR 0.50, 95% CI 0.31-0.80), but was associated with a significant increase in caesarean section rates (RR 1.63, 95% CI 1.29-2.07) and instrumental delivery rates (RR 1.15, 95% CI 1.01-1.33). No significant reduction in perinatal mortality (RR 0.86, 95% CI 0.59-1.23) or cerebral palsy rates was demonstrated. The authors concluded that the clinical decision to use continuous EFM must balance the benefit of seizure reduction against the increased risk of operative delivery, and that non-reassuring CTG patterns should always be evaluated in clinical context rather than acted upon in isolation.'
      ),

      ...entry(8,
        'Baker H, Pilarski N, Hodgetts-Morton VA, Morris RK (2021)',
        'Eur J Obstet Gynecol Reprod Biol', '34171634',
        'Baker et al. conducted a systematic review and meta-analysis comparing visual (vCTG) and computerised (cCTG) antenatal cardiotocography for the prevention of perinatal morbidity and mortality, published in the European Journal of Obstetrics, Gynaecology and Reproductive Biology. They included 3 RCTs and 3 non-randomised studies, all restricted to high-risk women. Meta-analysis of RCTs showed a non-significant reduction in all-cause perinatal mortality (RR 0.23, 95% CI 0.04-1.30) and preventable perinatal mortality (RR 0.27, 95% CI 0.05-1.56) with cCTG versus vCTG. cCTG reduced time spent in hospital and the need for additional investigations. The authors emphasised that high-risk women are the primary target group for intensive CTG surveillance, and that cCTG may offer objective, reproducible assessment beyond visual interpretation. This is one of the most recent and comprehensive systematic reviews on antenatal CTG in high-risk pregnancy.'
      ),

      ...entry(9,
        'Bhide A, Meroni A, Frick A, Thilaganathan B (2024)',
        'BJOG', '37039242',
        'Bhide et al. conducted a large retrospective observational study at a UK university hospital, examining the significance of failure to meet Dawes-Redman criteria (the computerised CTG normality standard) in 14,025 antenatal CTG records of high-risk pregnancies. Criteria were not met in 6.46% of records. Stillbirths were significantly more frequent in the group not meeting criteria (OR 8.78, 95% CI 4.28-18.02), even after excluding those with abnormally low short-term variation (STV <4 ms). The risk of stillbirth in the criteria-not-met group was 8.78 times that of the criteria-met group. The authors recommended that pregnancies failing to meet Dawes-Redman criteria require close follow-up, unless STV is ≥8 ms. This study provides robust quantitative evidence for the adverse prognostic significance of a non-reactive or non-qualifying CTG in high-risk pregnancies and is directly relevant to the present study.'
      ),

      ...entry(10,
        'Saccone G, Tagliaferri S, Grasso A, et al. (2021)',
        'Am J Obstet Gynecol MFM', '33451612',
        'Saccone et al. published a parallel-group randomised clinical trial comparing standard visual CTG with computerised CTG (cCTG) for antenatal monitoring in high-risk pregnancies (gestational age 24-37 weeks), published in the American Journal of Obstetrics and Gynecology Maternal-Fetal Medicine. A total of 28 women were enrolled. Caesarean delivery rates were identical in both groups (64.3%), with no significant difference in preterm birth, gestational age at delivery, Apgar score, or birth weight. The authors concluded that cCTG did not increase caesarean delivery rates compared to standard CTG in high-risk pregnancies. Though limited by small sample size, this RCT provides direct evidence that the mode of CTG interpretation does not independently drive operative delivery rates — rather, the underlying high-risk condition and clinical context are the primary drivers of obstetric intervention.'
      ),

      ...entry(11,
        'Piron-Dumitrascu M, Cretoiu D, Varlas VN, Suciu N (2025)',
        'J Med Life', '41020080',
        'Piron-Dumitrascu et al. published a comprehensive narrative review of fetal and maternal surveillance tools in high-risk pregnancies in the Journal of Medicine and Life in 2025. The review highlighted that stillbirths — estimated at millions annually by the WHO — represent a partially neglected global health problem with a major emotional and economic impact. The authors reviewed current evidence on risk factor identification, imaging surveillance, CTG, fetal movement counting, and biomarker evaluation. They found that identification of fetal growth restriction (FGR) and placental pathology using ultrasound, CTG, and Doppler can contribute to reducing stillbirths through timely intervention. Fetal movement counting lacked high sensitivity/specificity as a standalone tool. CTG-based surveillance, integrated with BPP and Doppler, was recommended as the standard of care for high-risk pregnancies. The review emphasised the need for further research on optimal surveillance protocols in low- and middle-income countries.'
      ),

      ...entry(12,
        'Subramanian V, Venkat J, Dhanapal M (2016)',
        'J Obstet Gynaecol India', '27651594',
        'Subramanian et al. conducted a prospective observational study at Madras Medical College, Chennai, enrolling 200 high-risk pregnant women (with anaemia or hypertensive disorders) to compare the predictive value of Doppler velocimetry and the non-stress test for perinatal outcome. They categorised patients into four groups: normal Doppler + reactive NST; normal Doppler + non-reactive NST; abnormal Doppler + reactive NST; abnormal Doppler + non-reactive NST. Normal Doppler with reactive NST had the best perinatal outcome. When both were abnormal, adverse perinatal outcomes were highest. Critically, when Doppler was normal but NST was non-reactive, the caesarean section rate was significantly increased, demonstrating that NRCTG carries independent clinical significance even in the absence of Doppler abnormality. The authors recommended combining both modalities for optimal prediction of perinatal outcome in high-risk pregnancies — a finding directly applicable to the present study.'
      ),

      ...entry(13,
        'Jha S, Dangal G (2020)',
        'J Nepal Health Res Counc', '33210630',
        'Jha and Dangal conducted a cross-sectional study at Paropakar Maternity and Women\'s Hospital, Nepal, evaluating the role of the modified biophysical profile (mBPP = CTG + AFI) in predicting fetal outcome in 172 high-risk pregnancies at term. Abnormal mBPP was present in 75 (43.6%) cases. Abnormal mBPP was associated with a significantly higher caesarean section rate, greater need for neonatal resuscitation, and higher NICU admission rates. Among those with abnormal mBPP, low Apgar scores at 1 and 5 minutes were significantly more frequent. Normal mBPP was associated with more spontaneous vaginal deliveries and less adverse fetal outcome. The study validated the mBPP as an effective antepartum surveillance tool in high-risk pregnancies and highlighted the role of the non-reactive CTG component of the mBPP as the primary driver of the abnormal mBPP classification.'
      ),

      ...entry(14,
        'Joshi SK, Dangal G (2022)',
        'J Nepal Health Res Counc', '35945848',
        'Joshi and Dangal conducted a hospital-based study at Paropakar Maternity and Women\'s Hospital, Nepal, assessing NST as a predictor of maternal and fetal outcome in 54 women with reduced fetal movement at term without pregnancy complications. NST was categorised as reactive, suspicious, or abnormal (non-reactive). Among the abnormal NST group, 31.48% underwent LSCS, compared to 0% in the reactive group. Neonatal resuscitation was required in 62.1% of abnormal NST cases versus 5.4% in reactive cases. NICU admission was needed in 46.1% with abnormal NST versus 0% with reactive NST. There were 9 neonatal mortalities in the abnormal NST group. The authors concluded that the NST is a reliable predictor of fetal hypoxia and perinatal outcome, particularly when combined with clinical symptoms such as reduced fetal movement — reinforcing the clinical value of NRCTG detection in high-risk and symptomatic pregnancies.'
      ),

      ...entry(15,
        'Dutta I, Suman S, Pan T (2025)',
        'Niger Med J', '40703896',
        'Dutta et al. conducted a prospective case-control study at a tertiary care hospital in Eastern India, comparing maternal and fetal outcomes in idiopathic oligohydramnios (AFI ≤5 cm, n=50) with normal AFI controls (n=50) after 34 weeks of gestation. Non-reactive CTG (NRCTG) was significantly more common in the oligohydramnios group (60% vs. 20%). Meconium-stained liquor was found in 44% of the oligohydramnios group. Caesarean section rate was 78% vs. 32% (p<0.001), primarily due to fetal distress (71.8%). NICU admission was 60% vs. 16% (p<0.001), with more SGA neonates and more low Apgar scores in the oligohydramnios group. This Indian study is of particular relevance to the present work as it directly quantifies the prevalence and consequences of NRCTG in a South Asian tertiary care setting, demonstrating that oligohydramnios is among the high-risk conditions most powerfully associated with non-reactive CTG and adverse perinatal outcome.'
      ),

      ...entry(16,
        'Darnal N, Dangal G (2020)',
        'J Nepal Health Res Counc', '32969374',
        'Darnal and Dangal conducted a hospital-based cross-sectional study at Paropakar Maternity and Women\'s Hospital, Nepal, comparing maternal and fetal outcomes between emergency and elective caesarean sections (170 cases each). The most common indication for emergency caesarean was fetal distress (i.e., non-reassuring/non-reactive CTG). Emergency caesarean was associated with significantly higher maternal morbidity including wound infection, PPH, UTI, need for blood transfusion, fever, and maternal ICU admission (p<0.05). Fetal outcomes were also worse after emergency LSCS, with significantly higher rates of birth asphyxia, meconium-stained liquor, and NICU admission compared to elective LSCS. This study highlights that emergency delivery triggered by non-reactive CTG carries significant fetomaternal morbidity, underscoring the importance of early detection and timely management of NRCTG before the need for emergency intervention.'
      ),

      ...entry(17,
        'Weiner E, Bar J, Fainstein N, et al. (2015)',
        'Eur J Obstet Gynecol Reprod Biol', '25553352',
        'Weiner et al. retrospectively analysed intraoperative findings, placental histopathology, and neonatal outcomes in 543 emergency caesarean deliveries performed for non-reassuring fetal heart rate (NRFHR) at a tertiary centre in Israel. Intraoperative findings (predominantly cord complications, 77%) were identified in 49.5% of cases. In the remaining cases, placental pathology — including maternal underperfusion, fetal thrombo-occlusive disease, and inflammatory lesions — was more prevalent, indicating chronic placental compromise as the underlying mechanism. Multivariate logistic regression identified maternal age, gestational age, pre-eclampsia, low placental weight, and maternal inflammatory response as independent predictors of adverse neonatal outcome. The study demonstrates that NRFHR necessitating emergency caesarean arises from heterogeneous mechanisms, with acute (cord complications) and chronic (placental insufficiency) aetiologies both contributing — a finding relevant to the management algorithm for NRCTG in high-risk pregnancies.'
      ),

      ...entry(18,
        'Amsumang S, Wuttikonsammakit P, Chamnan P (2017)',
        'J Med Assoc Thai', '29911805',
        'Amsumang et al. studied the association between intrapartum CTG categories (classified by NICHD 2008 criteria) and early neonatal outcomes in 120 singleton pregnancies at a tertiary hospital in Thailand. Category II EFM was present in 37 (30.8%) cases. Compared to Category I, Category II was associated with a 5-fold higher risk of 1-minute Apgar score <9 (adjusted OR 4.96, 95% CI 1.03-24.00; p=0.046) and a 38-fold higher risk of neonatal acidosis (adjusted OR 37.88, 95% CI 7.33-195.90; p<0.001). Variable deceleration was independently associated with a 6-fold increased risk of low 1-minute Apgar. Minimal variability increased the risk of neonatal acidosis 16-fold. The study establishes a clear quantitative relationship between abnormal CTG categories (the intrapartum analogue of non-reactive CTG) and immediate neonatal outcome parameters, directly supporting the use of NRCTG as a predictor of perinatal compromise.'
      ),

      ...entry(19,
        'Jenniskens K, Janssen PA (2015)',
        'J Obstet Gynaecol Can', '26001867',
        'Jenniskens and Janssen evaluated the incidence of severe neonatal morbidity in 8,466 term singletons delivered by caesarean section for non-reassuring fetal status (NRFS) in British Columbia, Canada, between 2007-2011. Apgar <7 at 1 minute occurred in 8.0%, cord pH <7.10 in 6.5%, and 5-minute Apgar <4 in 0.6% of cases. Apgar at 1 minute <7 had the best predictive accuracy for composite adverse neonatal outcome (sensitivity 81%, specificity 81%, AUC 0.87). The authors concluded that despite caesarean section being performed for NRFS, severe neonatal morbidity was rare in the British Columbia cohort, reflecting the efficacy of timely intervention. However, they also noted that EFM remains a non-specific test for fetal compromise and that Apgar score is a valuable complementary outcome measure alongside CTG findings — insights relevant to the design and outcome analysis of the present study.'
      ),

      ...entry(20,
        'Adnan M, Mydam J, Hageman JR, Cohen L (2022)',
        'Cureus', '35651407',
        'Adnan et al. conducted a retrospective cohort study involving 210 deliveries with meconium-stained amniotic fluid (MSAF) matched to 210 controls with clear liquor, derived from 5,512 deliveries. Abnormal fetal heart tracing was significantly more common in the MSAF group (43.2% vs. 17.6%; p<0.001). Low Apgar at 1 minute (<7) was more frequent in MSAF cases (p=0.03), as was NICU admission (p=0.002) and neonatal resuscitation requirement (10.5% vs. 2.9%; p=0.003). After multivariate adjustment, only 1-minute Apgar score and abnormal FHT remained independent predictors of neonatal resuscitation requirement — MSAF alone did not retain statistical significance. This finding has critical implications for NRCTG interpretation: abnormal CTG in the context of meconium-stained liquor is a combination that powerfully predicts neonatal distress and mandates immediate intervention, an observation of direct relevance to managing NRCTG in high-risk parturients.'
      ),

      ...entry(21,
        'Alfirevic Z, Stampalija T, Dowswell T (2017)',
        'Cochrane Database Syst Rev', '28613398',
        'Alfirevic et al. updated the Cochrane systematic review on fetal and umbilical Doppler ultrasound in high-risk pregnancies, including 19 trials with 10,667 women. The use of umbilical artery Doppler in high-risk pregnancy was associated with significantly fewer perinatal deaths (RR 0.71, 95% CI 0.52-0.98; NNT=203), fewer inductions of labour (RR 0.89, 95% CI 0.80-0.99), and fewer caesarean sections (RR 0.90, 95% CI 0.84-0.97), compared to CTG-only surveillance. No significant difference was found in Apgar scores or operative vaginal deliveries. Ductus venosus Doppler combined with computerised CTG was associated with improved long-term neurological outcome compared to CTG-STV-guided delivery alone in early FGR. The study confirms that Doppler combined with CTG provides superior surveillance in high-risk pregnancies compared to CTG alone, and that non-reactive CTG findings must be contextualised with Doppler evidence before operative delivery decisions are made in suspected IUGR.'
      ),

      ...entry(22,
        'Sharma JB, Goyal M (2016)',
        'J Pak Med Assoc', '27582148',
        'Sharma and Goyal published a review article examining the role of cardiotocography specifically in diabetic pregnancies. They highlighted that diabetic mothers are at significantly increased risk of sudden unexplained intrauterine fetal death due to chronic hyperglycaemia, fetal macrosomia, polycythaemia, and secondary uteroplacental dysfunction. The review recommended weekly or twice-weekly CTG/NST from 28 weeks in GDM and from 34 weeks in well-controlled pre-gestational diabetes, with continuous EFM during both the first and second stages of labour. Non-reactive CTG in diabetic pregnancy was highlighted as a high-risk finding warranting immediate further evaluation and delivery consideration. In low-resource settings, the NST was identified as the most feasible first-line test for diabetic fetal surveillance. This review supports the classification of GDM as a major contributor to NRCTG in high-risk obstetric populations.'
      ),

      ...entry(23,
        'Liston R, Sawchuck D, Young D (2018)',
        'J Obstet Gynaecol Can', '29680084',
        'Liston, Sawchuck, and Young published the Society of Obstetricians and Gynaecologists of Canada (SOGC) Guideline No. 197b on Fetal Health Surveillance: Intrapartum Consensus Guideline. This comprehensive evidence-based guideline provides detailed recommendations for antepartum and intrapartum CTG interpretation, management of non-reassuring FHR patterns, and indications for expedited delivery. The guideline classifies FHR tracings as normal, atypical, or abnormal, with specific management algorithms for each category. For abnormal (non-reactive/pathological) FHR patterns, the guideline recommends immediate bedside assessment, intrauterine resuscitation manoeuvres (maternal repositioning, oxygen, IV fluids, tocolysis if appropriate), and expedited delivery if patterns persist. The guideline also addresses the limitations of CTG as a standalone surveillance tool and recommends integration with clinical assessment and adjunctive tests such as BPP and Doppler in high-risk pregnancies — a framework applicable to the management protocol of the present study.'
      ),

      ...entry(24,
        'Lees CC, Marlow N, van Wassenaer-Leemhuis A, et al. — TRUFFLE Group (2015)',
        'Lancet', '25747582',
        'The TRUFFLE (Trial of Randomised Umbilical and Fetal Flow in Europe) investigators published the pivotal RCT in The Lancet evaluating surveillance strategies in very preterm FGR (24-32 weeks). Women (n=503) were randomised to three delivery timing strategies: CTG short-term variation (STV) ≤3.5 ms; early Doppler changes (umbilical artery pulsatility index); or late Doppler changes (ductus venosus). The primary outcome was survival without neurological impairment at 2 years. STV-guided delivery was not inferior to Doppler-guided strategies for the primary outcome. Importantly, delivery based on STV <32 ms was associated with a higher rate of survival without neurological impairment at 2 years compared to delivery based on STV alone. The TRUFFLE trial established that CTG-derived STV is a valid, evidence-based trigger for delivery timing in severe early-onset FGR, supporting the use of computerised CTG as an objective non-reactive CTG criterion in the highest-risk pregnancies.'
      ),

      ...entry(25,
        'Ajah LO, Ibekwe PC, Onu FA, et al. (2016)',
        'J Clin Diagn Res', '27190897',
        'Ajah et al. evaluated the clinical diagnosis of fetal distress and perinatal outcome in a low-resource tertiary centre in Enugu, Nigeria. In their observational cohort, non-reassuring CTG was the primary criterion for diagnosing intrapartum fetal distress. They found that clinical diagnosis of fetal distress was made in 12.4% of deliveries, of which 78% were delivered by emergency caesarean section. However, only 54% of those diagnosed with fetal distress on CTG had confirmed adverse neonatal outcome (low Apgar, NICU admission, or neonatal death), indicating a false-positive rate of approximately 46%. The authors attributed this to over-reliance on CTG findings without integration of other clinical parameters. This study highlights the critical importance of combining NRCTG findings with clinical assessment, BPP, and Doppler in high-risk pregnancies to minimise unnecessary operative intervention while avoiding missed cases of true fetal compromise — a core principle in the management of NRCTG studied in the present work.'
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      ...[
        '1. Freeman RK, Anderson G, Dorchester W. A prospective multi-institutional study of antepartum fetal heart rate monitoring. Am J Obstet Gynecol. 1982;143(7):771-777.',
        '2. Manning FA, Morrison I, Harman CR, Lange IR, Menticoglou S. Fetal assessment based on fetal biophysical profile scoring: experience in 19,221 referred high-risk pregnancies. Am J Obstet Gynecol. 1987;157(4):880-884.',
        '3. Vintzileos AM, Campbell WA, Nochimson DJ, et al. The use and misuse of the fetal biophysical profile. Am J Obstet Gynecol. 1987;156(3):527-533. [PMID: 3561481]',
        '4. Alfirevic Z, Neilson JP. Cardiotocography for antepartum fetal assessment (Cochrane Review). In: The Cochrane Library, Issue 4. Oxford: Update Software; 1995. [PMID: 8490979]',
        '5. Macones GA, Hankins GD, Spong CY, Hauth J, Moore T. The 2008 National Institute of Child Health and Human Development workshop report on electronic fetal monitoring. Obstet Gynecol. 2008;112(3):661-666. [PMID: 18757666]',
        '6. Pattison N, McCowan L. Cardiotocography for antepartum fetal assessment. Cochrane Database Syst Rev. 2010;(1):CD001068. [PMID: 10683497]',
        '7. Alfirevic Z, Devane D, Gyte GM, Cuthbert A. Continuous cardiotocography (CTG) as a form of electronic fetal monitoring (EFM) for fetal assessment during labour. Cochrane Database Syst Rev. 2017;2(2):CD006066. [PMID: 28157275]',
        '8. Baker H, Pilarski N, Hodgetts-Morton VA, Morris RK. Comparison of visual and computerised antenatal cardiotocography in the prevention of perinatal morbidity and mortality. A systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol. 2021;264:282-289. [PMID: 34171634]',
        '9. Bhide A, Meroni A, Frick A, Thilaganathan B. The significance of meeting Dawes-Redman criteria in computerised antenatal fetal heart rate assessment. BJOG. 2024;131(2):168-176. [PMID: 37039242]',
        '10. Saccone G, Tagliaferri S, Grasso A, et al. Antenatal cardiotocography with and without computer analysis in high-risk pregnancy: a randomized clinical trial. Am J Obstet Gynecol MFM. 2021;3(1):100284. [PMID: 33451612]',
        '11. Piron-Dumitrascu M, Cretoiu D, Varlas VN, Suciu N. Fetal and maternal surveillance in high-risk pregnancy: tools, timing, and trends. J Med Life. 2025;18(8). doi:10.25122/jml-2025-0105. [PMID: 41020080]',
        '12. Subramanian V, Venkat J, Dhanapal M. Which is Superior, Doppler Velocimetry or Non-stress Test or Both in Predicting the Perinatal Outcome of High-Risk Pregnancies. J Obstet Gynaecol India. 2016;66(Suppl 1):S530-S535. [PMID: 27651594]',
        '13. Jha S, Dangal G. Role of Modified Biophysical Profile in High Risk Pregnancy in Predicting Fetal Outcome. J Nepal Health Res Counc. 2020;18(3):426-430. [PMID: 33210630]',
        '14. Joshi SK, Dangal G. Non Stress Test as a Predictor of Maternal and Fetal Outcome in Patients Presenting with Reduced Fetal Movement at Term. J Nepal Health Res Counc. 2022;20(1):133-138. [PMID: 35945848]',
        '15. Dutta I, Suman S, Pan T. Maternal and Fetal Outcomes in Idiopathic Oligohydramnios vs. Normal Amniotic Fluid Index After 34 Weeks: A Case-Control Study in Eastern India. Niger Med J. 2025;66(2). [PMID: 40703896]',
        '16. Darnal N, Dangal G. Maternal and Fetal Outcome in Emergency versus Elective Caesarean Section. J Nepal Health Res Counc. 2020;18(2):222-226. [PMID: 32969374]',
        '17. Weiner E, Bar J, Fainstein N, et al. Intraoperative findings, placental assessment and neonatal outcome in emergent cesarean deliveries for non-reassuring fetal heart rate. Eur J Obstet Gynecol Reprod Biol. 2015;186:76-80. [PMID: 25553352]',
        '18. Amsumang S, Wuttikonsammakit P, Chamnan P. Association Between Intrapartum Cardiotocogram and Early Neonatal Outcomes in a Tertiary Hospital in Thailand. J Med Assoc Thai. 2017;100(4):373-380. [PMID: 29911805]',
        '19. Jenniskens K, Janssen PA. Newborn outcomes in British Columbia after caesarean section for non-reassuring fetal status. J Obstet Gynaecol Can. 2015;37(3):234-242. [PMID: 26001867]',
        '20. Adnan M, Mydam J, Hageman JR, Cohen L. Fetal Heart Tracing Patterns and the Outcomes of Newborns With Meconium-Stained Amniotic Fluid. Cureus. 2022;14(4):e24545. [PMID: 35651407]',
        '21. Alfirevic Z, Stampalija T, Dowswell T. Fetal and umbilical Doppler ultrasound in high-risk pregnancies. Cochrane Database Syst Rev. 2017;6(6):CD007529. [PMID: 28613398]',
        '22. Sharma JB, Goyal M. Cardiotocography and diabetic pregnancy. J Pak Med Assoc. 2016;66(9 Suppl 2):S104-S108. [PMID: 27582148]',
        '23. Liston R, Sawchuck D, Young D. No. 197b-Fetal Health Surveillance: Intrapartum Consensus Guideline. J Obstet Gynaecol Can. 2018;40(4):e384-e397. [PMID: 29680084]',
        '24. Lees CC, Marlow N, van Wassenaer-Leemhuis A, et al.; TRUFFLE Group. 2 year neurodevelopmental and intermediate perinatal outcomes in infants with very preterm fetal growth restriction (TRUFFLE): a randomised trial. Lancet. 2015;385(9983):2162-2172. [PMID: 25747582]',
        '25. Ajah LO, Ibekwe PC, Onu FA, et al. Evaluation of Clinical Diagnosis of Fetal Distress and Perinatal Outcome in a Low Resource Nigerian Setting. J Clin Diagn Res. 2016;10(4):QC16-QC19. [PMID: 27190897]',
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