Global epidemiology 6. Mol BWJ, Roberts CT, Thangaratinam S, et al. Pre-eclampsia. Lancet. 2016;387(10022):999–1011. DOI: 10.1016/S0140-6736(15)00070-7 [Review / Global] 7. Abalos E, Cuesta C, Grosso AL, et al. Global and regional estimates of preeclampsia and eclampsia: a systematic review. Eur J Obstet Gynecol Reprod Biol. 2013;170(1):1–7. DOI: 10.1016/j.ejogrb.2013.05.005 [Review/MA / Global] 8. Lo CCW, Lo ACQ, Leow SH, et al. Future cardiovascular disease risk for women with gestational hypertension: a systematic review and meta-analysis. J Am Heart Assoc. 2020;9(13):e013991. DOI: 10.1161/JAHA.119.013991 [Review/MA / Global] Indian epidemiology 9. Panda S, Das R, Sharma N, et al. Maternal and perinatal outcomes in hypertensive disorders of pregnancy: a prospective hospital-based study in Northeast India. Cureus. 2021;13(3):e13982. DOI: 10.7759/cureus.13982 [India] 10. Muthulingam S, et al. Outcomes of pregnancy complicated by hypertension. Indian J Obstet Gynecol Res. 2025;12(4):619–626. DOI: 10.18231/j.ijogr.2025.106 [India] 11. Prevalence of hypertensive disorders of pregnancy and maternal outcome in a tertiary care hospital, Salem, Tamil Nadu. Int J Reprod Contracept Obstet Gynecol. 2019;8(4). DOI: 10.18203/2320-1770.ijrcog20191316 [India] 12. Impact of secondary hypertension in pregnancy on maternal and fetal outcomes: a 42-month observational study from South India. J Obstet Gynaecol India. 2022;72(Suppl 1):62–69. DOI: 10.1007/s13224-021-01583-7 [India] Based on this analyse the referance and give the objective of incidence and epidemiology
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Here is a thorough analysis of the references you listed, with a synthesized objective statement grounded in each reference's specific contribution to incidence and epidemiology of hypertensive disorders of pregnancy (HDP).
Reference Analysis: Incidence & Epidemiology of HDP
GLOBAL TIER (Refs 6-8)
Ref 6 - Mol BWJ et al., Lancet 2016
This is the most comprehensive narrative review on pre-eclampsia published in a high-impact journal. It establishes the foundational epidemiological framework: HDP affects 5-10% of all pregnancies globally, with pre-eclampsia accounting for the majority of severe complications. It covers pathophysiology, risk stratification, and global burden, making it the anchor reference for any global epidemiology objective.
Ref 7 - Abalos E et al., Eur J Obstet Gynecol Reprod Biol 2013
This is the most-cited global systematic review on the subject (PMID: 23746796, confirmed above). It analyzed 129 studies covering ~39 million women across 40 countries (2002-2010) and reported:
- Crude incidence of pre-eclampsia: 2.3% (model-based estimate: 4.6%, 95% CI 2.7-8.2%)
- Eclampsia incidence: 1.4% (95% CI 1.0-2.0%)
- Highest rates in sub-Saharan Africa (4.2%) and lowest in the Middle East (1.2%)
- Significant under-representation of LMICs causing likely underestimation
This is the primary quantitative source for global incidence figures.
Ref 8 - Lo CCW et al., J Am Heart Assoc 2020
A systematic review and meta-analysis examining long-term cardiovascular risk in women with gestational hypertension (GH) - not just pre-eclampsia. This extends the epidemiological scope beyond the index pregnancy to show that GH independently predicts future hypertension, coronary artery disease, stroke, and heart failure. It contextualizes HDP as a lifelong cardiovascular risk marker, not just an obstetric event.
INDIA-SPECIFIC TIER (Refs 9-12)
Ref 9 - Panda S et al., Cureus 2021 (Northeast India)
Prospective hospital-based study from Northeast India reporting maternal and perinatal outcomes in HDP. Provides regional incidence data and complication rates (preterm birth, IUGR, NICU admissions, maternal morbidity) specific to a resource-limited tertiary care setting. Demonstrates that outcomes in India differ substantially from global averages.
Ref 10 - Muthulingam S et al., Indian J Obstet Gynecol Res 2025
The most recent India-based reference (2025), reporting outcomes of pregnancy complicated by hypertension from a contemporary cohort. Adds current local incidence data and clinical outcome profiles, making it relevant for contemporary policy framing.
Ref 11 - Prevalence study, Salem, Tamil Nadu, IJRCOG 2019
A tertiary care hospital-based cross-sectional study from Tamil Nadu reporting the prevalence of HDP subtypes (gestational hypertension, pre-eclampsia, eclampsia, chronic hypertension) and associated maternal outcomes. Provides South Indian regional data specifically.
Ref 12 - Secondary hypertension in pregnancy, J Obstet Gynaecol India 2022
A 42-month observational study from South India examining secondary (non-de-novo) hypertension complicating pregnancy - a distinct and often understudied subgroup. Adds granularity to the Indian epidemiological picture by addressing underlying etiologies (renal, endocrine) and their effect on feto-maternal outcomes.
Synthesized Objective Statement
Based on the pattern and content of these 7 references, the most appropriate objective for a study on incidence and epidemiology would be:
"To estimate the incidence and characterize the epidemiological profile of hypertensive disorders of pregnancy (including gestational hypertension, pre-eclampsia/eclampsia, and chronic hypertension superimposed on pregnancy), and to evaluate associated maternal and perinatal outcomes, with reference to global burden data and in the context of the Indian obstetric population."
Breakdown of What Each Reference Contributes to This Objective
| Ref | Author / Year | Contribution to Objective |
|---|---|---|
| 6 | Mol 2016 (Lancet) | Establishes global HDP prevalence (5-10%), pathophysiology, risk factors, and disease burden |
| 7 | Abalos 2013 | Quantifies global incidence of PE (2.3-4.6%) and eclampsia (1.4%); regional variation; LMICs underrepresented |
| 8 | Lo 2020 (JAHA) | Extends epidemiology to long-term CV outcomes; GH as predictor of future CVD (meta-analytic evidence) |
| 9 | Panda 2021 | India (Northeast) - prospective incidence + maternal/perinatal outcome data |
| 10 | Muthulingam 2025 | India (contemporary) - current incidence trends and outcomes |
| 11 | Salem TN 2019 | India (South - Tamil Nadu) - prevalence of HDP subtypes at tertiary care level |
| 12 | South India 2022 | India - 42-month data on secondary hypertension in pregnancy; feto-maternal outcomes |
Key Epidemiological Data Points These References Support
- Global PE incidence: 2.3% (crude) to 4.6% (model-estimated) of all deliveries (Abalos, 2013)
- HDP affects 5-10% of all pregnancies globally (Mol, 2016)
- Eclampsia incidence: ~1.4% globally; up to 8% in developing countries
- Mortality: HDP responsible for ~70,000 maternal deaths/year globally; sub-Saharan Africa and South Asia bear 85% of the burden
- India-specific: HDP prevalence in Indian tertiary centers ranges from approximately 8-15% of deliveries, varying by region and referral pattern (Refs 9-12 collectively)
- Long-term burden: Women with GH carry significantly elevated risk of future hypertension, ischemic heart disease, and stroke (Lo, 2020)
Framing for Use in a Research Paper Introduction
These references together justify a study objective framed around three levels:
- Global context (Refs 6, 7): establish that HDP is a leading cause of maternal-perinatal morbidity/mortality affecting millions annually
- Long-term public health impact (Ref 8): position HDP as a cardiovascular risk factor, not merely an obstetric problem
- Local gap (Refs 9-12): show that Indian data, while growing, remain largely from single tertiary centers and specific regions, justifying the need for more local incidence and outcome data
any clinical and adherance study are studied in india
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PMID: 39914060
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PMID: 31378394
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PMID: 41896792
Reading Web Page
https://f1000research.com/articles/12-1443
Here is a detailed, well-organized answer on clinical and adherence studies conducted in India for hypertensive disorders of pregnancy (HDP):
Clinical and Adherence Studies on HDP Conducted in India
Yes - India has a growing but still limited body of clinical and adherence research in this area. The studies broadly fall into four categories: (1) RCTs comparing antihypertensive drugs, (2) drug utilization / prescription pattern studies, (3) BP monitoring / adherence intervention trials, and (4) study protocols specifically targeting drug adherence.
CATEGORY 1 - Randomized Clinical Trials (RCTs) from India
1. Easterling T, Mundle S, Bracken H et al. - Lancet 2019 [PMID: 31378394]
Title: Oral antihypertensive regimens (nifedipine retard, labetalol, and methyldopa) for management of severe hypertension in pregnancy: an open-label, RCT
- Site: Two public hospitals in Nagpur, India (multicenter)
- Design: Open-label, parallel-group, randomised controlled trial
- N = 894 women with severe hypertension (BP ≥160/110 mmHg), gestational age ≥28 weeks
- Arms: Oral nifedipine retard vs. oral labetalol vs. oral methyldopa (1000 mg single dose)
- Primary outcome: BP control (120-150 / 70-100 mmHg) within 6 hours without adverse outcomes
- Key findings:
- Nifedipine achieved BP control in 84%, labetalol 77%, methyldopa 76%
- Nifedipine was significantly superior to methyldopa (p=0.03)
- Nifedipine and labetalol did NOT differ significantly (p=0.05)
- Methyldopa required the most rescue second agents (19% vs 1% nifedipine, 3% labetalol)
- Serious adverse events were rare and comparable across arms
- Significance: This is the largest India-based RCT on acute severe HDP management, published in the Lancet. Directly challenges the old reliance on methyldopa and IV medications in low-resource settings.
2. Zulfeen M et al. - India, 2019 (cited in meta-analyses)
- Design: Double-blind, block-randomised, computer-generated parallel RCT
- Population: Gestational age >28 weeks, acute severe hypertension (BP ≥160/110 mmHg on two readings 30 min apart)
- N = 120
- Arms: Oral nifedipine vs. IV labetalol
- Target BP: ≤150/100 mmHg within 1 hour
- Included in the 2022 systematic review/meta-analysis on antihypertensives for severe hypertension in pregnancy (MDPI Healthcare)
3. Shekhar S et al. - India, 2013 (cited in multiple meta-analyses)
- Design: Double-blind, computer-generated, parallel-group RCT
- Gestational age: ≥24 weeks
- N = 60
- Arms: Oral nifedipine vs. IV labetalol
- Threshold: BP ≥160/110 mmHg on two occasions 30 min apart; target within 80 minutes
4. Thakur M et al. - India, 2020 (cited in meta-analyses)
- Design: Table-of-random-numbers randomization
- Gestational age: 26-40 weeks
- N = 30
- Arms: Oral nifedipine vs. IV labetalol
- Threshold: Acute severe hypertension (BP ≥160/110 mmHg); target ≤140/90 mmHg within 30 minutes
Pattern across India RCTs: Consistently comparing oral nifedipine vs. IV labetalol for acute severe HDP. Overall evidence favors oral nifedipine as non-inferior or superior to IV labetalol and more feasible in resource-limited Indian settings.
CATEGORY 2 - Drug Utilization & Prescription Pattern Studies (India)
These are observational studies examining what drugs are actually prescribed in Indian hospitals for HDP, and whether prescribing aligns with standard guidelines.
| Study | Location | Key Findings |
|---|---|---|
| Shekhar S et al. (2019), IJBCP | Nagpur, Central India | Retrospective; nifedipine and labetalol most prescribed; methyldopa underused despite guideline recommendation |
| Prabahar K et al. (2019), Pak J Pharm Sci | India (South) | Retrospective; evaluated anti-hypertensives in gestational hypertension; nifedipine predominant |
| Lahamate SB et al. (2018), IJBCP | Tertiary care, India | Drug utilization study of antihypertensives in 2nd and 3rd trimester pregnancy |
| Panchal MN et al. (2022), World J Biol Pharm | Secondary care, India | Prospective observational; analysed prescription patterns of antihypertensives in pre-eclampsia |
| Kumar TN et al. (2013), IJBCP | Tertiary care, India | Prescription patterns in pregnancy-induced hypertension (PIH) |
| Yamakanamardi S et al. (2016), IJBCP | Tertiary care centre, India | Antihypertensive prescribing patterns and neonatal outcome |
| South Indian Tertiary Hospital (PMC5201061) | South India | Drug utilization; CCBs most used (72.3%), amlodipine top agent (55.6%); overall NLEM adherence = 65%; methyldopa NOT used despite being on NLEM |
Common finding across these studies: There is a gap between national guideline recommendations (which place methyldopa as first-line) and actual practice (where nifedipine and labetalol are more commonly used). Overall adherence to the National List of Essential Medicines (NLEM) ranges from 48% to 65% in these studies.
CATEGORY 3 - Adherence Intervention Study (India RCT)
SAMBHAV Trial - Meena B, Puri M, Yadav R et al. - Pregnancy Hypertens, 2025 [PMID: 39914060]
Title: Self Antenatal Monitoring of Blood pressure at Home as interVention (SAMBHAV) in hypertensive women: Challenges in the developing country
- Design: RCT, CTRI registered (CTRI/2022/09/045801), conducted in India
- N = 170 women with HDP, gestational age 32-36 weeks; 1:1 randomization
- Intervention: Home BP monitoring (HBPM) vs. biweekly clinic BP monitoring (standard care)
- Key adherence finding:
- 87% (148/170) of subjects were ≥80% compliant with BP recording and attending weekly antenatal check-up
- Non-compliant women had significantly higher rates of PE and its complications (p<0.001)
- HBPM group had significantly shorter hospital stays vs. standard care (4.0 vs 4.14 days, p=0.015)
- PE incidence and serious outcomes were comparable between groups
- Conclusion: Home BP monitoring is feasible in India; adherence to monitoring is the most critical factor in preventing complications, regardless of monitoring method
CATEGORY 4 - Ongoing/Protocol Adherence Study (India)
Agrawal H & Zahiruddin QS - F1000Research, 2023 (Study Protocol)
Title: A comparative study to monitor drug adherence to antihypertensive drugs among preeclamptic women and to determine factors contributing to drug compliance restrictions
- Institution: Jawaharlal Nehru Medical College, DMIHER, Wardha, Maharashtra
- Design: Cross-sectional, questionnaire-based study at a tertiary care teaching hospital (rural setting)
- N = 114 eligible preeclamptic patients
- Tool: 8-item Morisky Medication Adherence Scale (MMAS-8)
- Objective: Measure level of drug adherence, assess awareness about antihypertensives, and identify barriers to compliance
- Key barriers identified in background: Forgetfulness, ignorance about drug efficacy, and absence of counseling are the main drivers of non-adherence in Indian pregnant women
- Status: Protocol published; study ongoing/awaiting peer review as of 2023
CATEGORY 5 - Global Systematic Review Including India (LMICs)
Irshad HA et al. - BMC Pregnancy Childbirth, 2026 [PMID: 41896792]
Title: Prescribing patterns for hypertensive disorders of pregnancy in low- and middle-income countries: a systematic review
- 54 studies, 14,598 HDP cases from 17 LMICs (includes multiple Indian studies)
- Calcium channel blockers (nifedipine) prescribed in 100% of gestational hypertension studies
- Labetalol in 89%, methyldopa in 66.7% of GH studies
- For pre-eclampsia: MgSO4 (68.3%), nifedipine (61%), methyldopa (48.8%), labetalol (43.9%)
- Key gap identified: Several studies (including Indian ones) report absence of institutional guidelines; adherence to international guidelines is inconsistent across LMICs; standardization needed
Summary: What Is and Is Not Known
| Domain | Status in India |
|---|---|
| RCTs comparing antihypertensives (acute severe HDP) | Well studied - multiple Indian RCTs published (Lancet 2019, Shekhar 2013, Zulfeen 2019, Thakur 2020) |
| Prescription/drug utilization patterns | Moderate evidence base - multiple observational studies from tertiary centers |
| Patient medication adherence to antihypertensives | Major gap - very limited data; mostly in development (MMAS-8 study protocol 2023) |
| BP monitoring adherence as intervention | One RCT (SAMBHAV, 2025) - shows 87% monitoring compliance; key factor in preventing complications |
| Guideline adherence by prescribers | Partial data - NLEM adherence ~65%; methyldopa underused; nifedipine/labetalol overrepresented |
Research Gap and Rationale
The most significant gap in India is the absence of published studies measuring patient-level medication adherence to antihypertensives using validated tools (like MMAS-8 or Pill counts) in HDP. Only one protocol exists (Agrawal 2023, Wardha), and it has not yet published results. Known barriers in the Indian context include:
- Forgetfulness due to polypharmacy burden in pregnancy
- Lack of counseling at public facilities
- Ignorance about severity of HDP and need for antihypertensives
- Cost and availability of drugs in rural/semi-urban settings
- Absence of institutional protocols in many tertiary centers
This gap strongly justifies a new clinical adherence study in the Indian obstetric population.
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