Pediatrics 1 mcqs saqs and laqs from topic one

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Pediatrics 1 — Topic 1: Growth, Development & Newborn Assessment

MCQs (Multiple Choice Questions)

MCQ 1. A newborn infant is assessed at 1 minute of life. The findings are: heart rate 90 bpm, weak irregular respirations, some limb flexion, grimace on stimulation, and blue extremities with a pink body. What is this infant's Apgar score?

A) 3
B) 4
C) 5
D) 6
E) 7

Answer: C — 5 Scoring: HR <100 = 1, irregular respirations = 1, some flexion = 1, grimace = 1, blue extremities/pink body = 1. Total = 5.

MCQ 2. At what interval(s) is the Apgar score routinely assessed?

A) 1 minute only
B) 5 minutes only
C) 1 and 5 minutes
D) 2 and 10 minutes
E) Every 5 minutes starting at birth

Answer: C — 1 and 5 minutes If the score remains <7 at 5 minutes, it is repeated at 5-minute intervals up to 20 minutes.

MCQ 3. An infant's weight, length, and head circumference all fall below the 10th percentile for gestational age. Which classification applies?

A) Large for gestational age (LGA)
B) Appropriate for gestational age (AGA)
C) Small for gestational age (SGA)
D) Preterm appropriate
E) Post-term large

Answer: C — Small for gestational age (SGA) SGA = growth parameters <10th percentile. These infants are at risk for hypothermia and hypoglycemia.

MCQ 4. Which of the following mothers is MOST likely to deliver a large-for-gestational-age (LGA) infant?

A) A mother with iron deficiency anaemia
B) A mother with uncontrolled gestational diabetes
C) A mother with pre-eclampsia
D) A mother who smokes
E) A mother with hypothyroidism

Answer: B — Uncontrolled gestational diabetes LGA infants (growth parameters >90th percentile) are commonly born to mothers with uncontrolled diabetes; they are at risk for neonatal hypoglycaemia.

MCQ 5. At birth, a healthy newborn's brain mass is approximately what percentage of adult brain mass?

A) 10%
B) 26%
C) 40%
D) 55%
E) 75%

Answer: B — 26% Brain mass is 26% of adult at birth, 55% at 1 year, and reaches near-adult proportions by end of year 2.

MCQ 6. Growth in height in girls typically ceases earlier than in boys because of:

A) Lower levels of growth hormone in females
B) Earlier epiphyseal fusion driven by oestrogen
C) Lower caloric intake in adolescent girls
D) Delayed production of IGF-1 in females
E) Testosterone suppression of bone growth

Answer: B — Earlier epiphyseal fusion driven by oestrogen Oestrogen causes rapid growth between ages 11–13 but leads to epiphyseal closure around ages 14–16, ending female height gain earlier than in males.

MCQ 7. The new Ballard score is used to assess:

A) Nutritional status of the newborn
B) Risk of neonatal sepsis
C) Gestational age of the newborn
D) Severity of respiratory distress
E) Degree of hypoxic-ischaemic encephalopathy

Answer: C — Gestational age of the newborn The Ballard score evaluates neuromuscular and physical maturity criteria to estimate gestational age.

MCQ 8. A low Apgar score of 0–3 at 5 minutes is MOST associated with which outcome?

A) Cerebral palsy in all affected infants
B) Confirmed prenatal hypoxia
C) Increased risk of neonatal death
D) Guaranteed long-term neurological deficit
E) Need for immediate cardiac surgery

Answer: C — Increased risk of neonatal death A score of 0–3 at 5 minutes may correlate with neonatal death but cannot independently confirm an in-utero hypoxic event or predict all neurological outcomes.

MCQ 9. Behavioural development in infancy is primarily determined by:

A) Nutritional status alone
B) Maturity of the nervous system
C) Maternal education level
D) Birth weight
E) Gestational age only

Answer: B — Maturity of the nervous system Behavioural growth is principally related to nervous system maturity, including myelination of CNS tracts, which is not complete until the end of the first year.

MCQ 10. Which of the following is a recognised reason an Apgar score may be falsely low?

A) Maternal iron supplementation
B) Vaginal delivery
C) Prematurity
D) Post-term birth
E) Breastfeeding initiation

Answer: C — Prematurity Gestational age, maternal medications, neurologic and cardiorespiratory conditions, trauma, and infection can all affect the Apgar score.

SAQs (Short Answer Questions)

SAQ 1. List the five components of the Apgar score, the criteria for each score (0, 1, 2), and state what is considered a normal score.

Model Answer:

Sign	0	1	2
Heart rate	Absent	<100 bpm	≥100 bpm
Respirations	Absent	Irregular/slow	Strong cry
Muscle tone	Limp	Some flexion	Active motion
Reflex irritability	No response	Grimace	Cough/sneeze/cry
Colour	Blue/pale all over	Blue extremities, pink body	Completely pink

Assessed at 1 and 5 minutes
Normal = 7–10
Score <7 requires repeat every 5 minutes up to 20 minutes
Resuscitation must not be interrupted to calculate the score
(Textbook of Family Medicine 9e, p. 527)

SAQ 2. Describe the classification of newborns based on growth parameters relative to gestational age, and state one complication associated with each abnormal category.

Model Answer:

AGA (Appropriate for Gestational Age): weight, length, and head circumference between the 10th–90th percentile — normal
SGA (Small for Gestational Age): parameters <10th percentile
- Complications: temperature instability, hypoglycaemia
LGA (Large for Gestational Age): parameters >90th percentile
- Most commonly born to mothers with uncontrolled diabetes
- Complication: neonatal hypoglycaemia

All parameters must be plotted on growth charts and the Ballard score used to confirm gestational age.

SAQ 3. Describe the pattern of height growth in boys vs. girls during puberty, explaining the underlying hormonal mechanisms and their effects on the epiphyses.

Model Answer:

Girls: Oestrogen causes rapid height gain starting around age 11–13, but also leads to early epiphyseal fusion (ages 14–16), ending growth sooner
Boys: Testosterone drives growth from approximately age 13–17, with delayed epiphyseal fusion, resulting in a longer growth window and greater final adult height
Net result: males achieve a greater final height despite beginning their pubertal growth spurt later
(Guyton & Hall Medical Physiology, p. 1057)

SAQ 4. What is the significance of brain growth in the first two years of life? What clinical monitoring is implied?

Model Answer:

At birth, brain mass = 26% of adult mass
At 1 year = 55% of adult mass
By end of year 2 = near-adult proportions
Fontanelles and cranial sutures close during this period, allowing only ~20% additional growth beyond age 2
CNS tracts are not fully myelinated until end of year 1
Clinical implication: Developmental progress charts (like Figure 84.9 in Guyton) should be used to track motor, language, and social milestones and identify delays early

LAQs (Long Answer Questions)

LAQ 1. Write a comprehensive account of the assessment of the newborn infant, including the Apgar score, growth parameter classification, and gestational age estimation.

Model Answer (Outline):

1. Immediate Newborn Assessment — The Apgar Score

Developed to provide a rapid, standardised assessment of newborn condition
Scored at 1 and 5 minutes after birth (repeated at 5-min intervals up to 20 min if <7)
Five parameters (each scored 0–2):
- Heart rate, Respirations, Muscle tone, Reflex irritability, Colour
Interpretation:
- 7–10: Normal
- 4–6: Moderately depressed
- 0–3: Severely depressed (correlates with neonatal mortality risk at 5 min)
Limitations: Score affected by prematurity, maternal drugs, neurological/cardiorespiratory conditions, infection, ongoing resuscitation
Resuscitation takes priority over Apgar scoring

2. Assessment of Growth Parameters

Measure and plot: weight, length, head circumference on standardised growth charts
Classifications:
- AGA: 10th–90th percentile
- SGA (<10th percentile): risks include hypoglycaemia, hypothermia
- LGA (>90th percentile): often born to diabetic mothers; risk for hypoglycaemia
Head circumference monitoring detects hydrocephalus or microcephaly

3. Gestational Age Assessment — New Ballard Score

Combines neuromuscular maturity (posture, arm/leg recoil, popliteal angle, scarf sign, heel-to-ear) and physical maturity (skin, lanugo, plantar surface, breast, eye/ear, genitalia)
Results categorise the infant as term, preterm, or post-term
Important because preterm infants require different management protocols

4. Behavioural Development Monitoring

Formal developmental progress charts are used to track:
- Motor milestones (rolling, sitting, standing, walking)
- Language milestones
- Social/adaptive milestones
CNS myelination is incomplete at birth → reassessment at each well-child visit
Brain mass reaches 55% of adult by age 1 and near-adult proportions by age 2

5. Initial Paediatric History for a New Infant

Birth history (gestation, delivery mode, complications)
Nutritional history (breastfed vs. formula)
Developmental milestones achieved
Immunisation record
Environmental history (parental smoking, household hazards)

LAQ 2. Discuss the growth and behavioural development of a child from birth to 20 years, with reference to the hormonal control of growth and the factors influencing neurological maturation.

Model Answer (Outline):

1. Physical Growth — Heights and Weights

Boys and girls grow at parallel rates through the first decade
Growth is regulated by:
- Growth hormone (GH) and IGF-1 — primary drivers throughout childhood
- Thyroid hormones — essential for normal skeletal and brain development
- Nutritional status — caloric and protein intake critical especially in first 2 years

2. Pubertal Growth Spurts

Girls (age 11–13): Oestrogen-driven rapid growth, but early epiphyseal fusion (ages 14–16) → height stops
Boys (age 13–17): Testosterone-driven growth spurt, later and more prolonged epiphyseal fusion → greater final height
Bone age (assessed by wrist X-ray) reflects epiphyseal maturity more accurately than chronological age

3. Brain and Neurological Development

Brain at birth = 26% adult mass; 55% at 1 year; ~adult by age 2
Fontanelles and skull sutures allow rapid expansion in first 2 years; then restrict to ~20% additional growth
CNS myelination is incomplete at birth → explains primitive reflex dominance in neonates
Cortical functions (vision, voluntary movement) develop progressively over the first months

4. Behavioural Milestones (First Year — Key Examples)

Age	Motor	Language	Social
2 months	Holds head up	Cooing	Social smile
4–6 months	Rolls over, sits with support	Babbling	Recognises parents
9 months	Stands with support	"Mama/Dada" (non-specific)	Stranger anxiety
12 months	Walks with support	1–2 words (specific)	Waves bye-bye

5. Factors Influencing Development

Biological: genetics, nutrition, chronic illness, hormonal status
Environmental: caregiver-infant relationship, stimulation, socioeconomic status
Pathological: CNS infections, lead exposure, hypothyroidism, prematurity

6. Clinical Application

Developmental progress charts are used at every well-child visit
Delays trigger further evaluation (vision, hearing, neurology referral)
Early intervention is most effective when abnormalities are identified in the first 2 years

Sources: Guyton & Hall Textbook of Medical Physiology; Textbook of Family Medicine 9e; Harriet Lane Handbook 23e

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Pediatrics 1 — Nutrition, Breastfeeding & Neonatology

SECTION A: NUTRITION & BREASTFEEDING

MCQs

MCQ 1. According to WHO recommendations, exclusive breastfeeding should be continued for:

A) 3 months, then complementary foods introduced
B) 4 months, then formula supplemented
C) 6 months, then complementary foods introduced
D) 12 months exclusively
E) Until the infant doubles birth weight

Answer: C — 6 months Exclusive breastfeeding for 6 months is the global standard, after which complementary foods are introduced while breastfeeding continues up to 2 years or beyond.

MCQ 2. Which immunoglobulin is present in the highest concentration in colostrum and provides mucosal immunity to the newborn?

A) IgG
B) IgM
C) IgE
D) IgA (secretory)
E) IgD

Answer: D — Secretory IgA (sIgA) Colostrum is rich in secretory IgA, which coats the neonatal gut mucosa and provides passive immunity against pathogens. Breast milk also contains lactoferrin and lysozyme.

MCQ 3. A breastfed newborn develops jaundice on day 4 of life with total bilirubin of 14 mg/dL. The infant is feeding well and gaining weight. Serology is negative for haemolysis. The MOST likely diagnosis is:

A) Biliary atresia
B) Crigler-Najjar syndrome
C) Breast milk jaundice
D) Sepsis-associated jaundice
E) Haemolytic disease of the newborn

Answer: C — Breast milk jaundice Breast milk jaundice is caused by bilirubin-deconjugating enzymes in breast milk. It is unconjugated, benign, and peaks around days 5–15. The infant is clinically well.

MCQ 4. Which of the following is NOT a recognised benefit of breastfeeding for the infant?

A) Reduced risk of necrotising enterocolitis
B) Protection against respiratory infections
C) Reduced risk of sudden infant death syndrome (SIDS)
D) Increased risk of obesity in later childhood
E) Passive transfer of maternal antibodies

Answer: D — Increased risk of obesity Breastfeeding is actually associated with a REDUCED risk of childhood obesity. All other options are proven benefits of breastfeeding.

MCQ 5. At what age should complementary (solid) foods typically be introduced alongside breastfeeding?

A) 2 months
B) 4 months
C) 6 months
D) 9 months
E) 12 months

Answer: C — 6 months Before 6 months, the infant's gut is not mature enough for solids. Introduction before 4 months is associated with allergies and obesity risk.

MCQ 6. A neonate with poor maternal nutrition and exclusively breastfed after the first week of life is at highest risk for deficiency of which vitamin?

A) Vitamin C
B) Vitamin D
C) Vitamin A
D) Vitamin E
E) Vitamin B12 (if mother is vegan)

Answer: E — Vitamin B12 (if mother is vegan) Breast milk from a vegan mother may be severely B12-deficient. Vitamin D supplementation is also universally recommended for breastfed infants. Both are commonly tested in exams — B12 deficiency causes irreversible neurological damage.

MCQ 7. Haemorrhagic disease of the newborn (vitamin K deficiency bleeding) is prevented by:

A) Oral iron supplementation
B) Vitamin C supplementation at birth
C) Vitamin K given intramuscularly at birth
D) Folic acid supplementation
E) Exclusive breastfeeding

Answer: C — Vitamin K given intramuscularly at birth *Breast milk has marginal vitamin K content. IM vitamin K at birth prevents deficiency of factors II, VII, IX, and X and thus prevents bleeding. (Bradley & Daroff's Neurology, p. 1250)

MCQ 8. Which of the following is a contraindication to breastfeeding?

A) Maternal hepatitis B infection
B) Mastitis without abscess
C) Maternal HIV infection in a high-income country with safe formula available
D) Infant with cleft palate (can still breast or cup feed)
E) Maternal mild common cold

Answer: C — Maternal HIV in a high-income country In settings where safe formula is reliably available, HIV+ mothers are advised not to breastfeed to prevent vertical transmission. In low-resource settings, WHO recommends continued breastfeeding with antiretroviral therapy.

SAQs — Nutrition & Breastfeeding

SAQ 1. List FIVE advantages of breastfeeding for the infant and TWO advantages for the mother.

Model Answer:

For the infant:

Passive immunity via secretory IgA, lactoferrin, and lysozyme
Reduced risk of respiratory and gastrointestinal infections
Reduced risk of necrotising enterocolitis (NEC), especially in preterm infants
Reduced risk of SIDS
Reduced risk of childhood obesity, type 1 diabetes, and allergies
(Bonus) Promotes gut microbiome colonisation and immune system maturation

For the mother:

Promotes uterine involution (oxytocin release reduces postpartum haemorrhage)
Reduced risk of breast and ovarian cancer
(Bonus) Lactational amenorrhoea (natural contraception), bonding

SAQ 2. Differentiate between physiological jaundice and breast milk jaundice in the neonate.

Feature	Physiological Jaundice	Breast Milk Jaundice
Onset	Day 2–3	Day 4–7
Peak	Day 3–5	Day 5–15
Resolution	By day 14 (term)	Can persist up to 3 months
Bilirubin type	Unconjugated	Unconjugated
Cause	Immature hepatic UGT; high RBC turnover	Bilirubin-deconjugating enzymes in breast milk
Infant appearance	Well	Well
Management	Supportive; phototherapy if high levels	Continue breastfeeding; phototherapy if needed

Sources: Robbins Basic Pathology; Tietz Laboratory Medicine 7e

LAQ — Nutrition & Breastfeeding

LAQ 1. Discuss the composition and benefits of human breast milk, the appropriate timing of complementary feeding, and the management of breastfeeding-associated jaundice.

Outline:

1. Composition of Breast Milk

Colostrum (days 1–5): High in sIgA, lactoferrin, lymphocytes, protein; low volume but highly concentrated
Transitional milk (days 5–14): Increasing fat and lactose
Mature milk (after day 14):
- Carbohydrate: lactose (primary energy source)
- Fat: long-chain polyunsaturated fatty acids (DHA, ARA — critical for brain development)
- Protein: whey-dominant (easier to digest than casein in formula)
- Immunological factors: sIgA, IgG, IgM, lactoferrin, lysozyme, cytokines, macrophages
- Hormones and growth factors (e.g., EGF, insulin-like growth factors)
- Vitamins: adequate except Vitamin D and B12 (in vegan mothers)

2. Benefits of Breastfeeding

Infant: immune protection, reduced NEC, SIDS, obesity, allergy, diabetes
Mother: involution, cancer risk reduction, bonding, contraception
Economic: no cost, always available, correct temperature

3. Complementary Feeding

Introduced at 6 months
Foods should be energy-dense, soft, varied
Iron-rich foods are especially important as breast milk iron decreases after 6 months
Breastfeeding should continue alongside solids up to 2 years or beyond (WHO)

4. Breastfeeding-Associated Jaundice

Type 1 — Breastfeeding failure jaundice (early onset, day 2–3): Due to inadequate caloric intake/dehydration → ↑ enterohepatic circulation of bilirubin → Management: improve latch, feeding frequency, supplement if needed
Type 2 — Breast milk jaundice (late onset, day 4–15+): Due to bilirubin-deconjugating glucuronidase enzymes in breast milk → unconjugated hyperbilirubinaemia → Management: continue breastfeeding; phototherapy if bilirubin crosses treatment threshold; exchange transfusion rarely needed
Both are benign in healthy term infants; persistent or conjugated jaundice requires urgent investigation (biliary atresia, metabolic disease)

SECTION B: NEONATOLOGY

MCQs

MCQ 9. A preterm infant born at 28 weeks develops progressive respiratory distress within hours of birth. Chest X-ray shows a "ground-glass" appearance with air bronchograms. The underlying defect is:

A) Meconium aspiration
B) Pulmonary surfactant deficiency
C) Diaphragmatic hernia
D) Congenital pneumonia
E) Tracheo-oesophageal fistula

Answer: B — Pulmonary surfactant deficiency Neonatal Respiratory Distress Syndrome (RDS)/Hyaline Membrane Disease is caused by surfactant deficiency in preterm lungs, leading to alveolar collapse. Classic CXR: ground-glass opacity with air bronchograms.

MCQ 10. Which of the following is the MOST serious complication of untreated severe neonatal unconjugated hyperbilirubinaemia?

A) Hepatic cirrhosis
B) Cholestatic liver disease
C) Kernicterus (bilirubin encephalopathy)
D) Haemolytic anaemia
E) Coagulopathy

Answer: C — Kernicterus *Unconjugated bilirubin crosses the blood–brain barrier (especially immature BBB of preterm/low-birth-weight infants) and deposits in the basal ganglia and brainstem nuclei, causing irreversible brain damage. (Tietz Laboratory Medicine 7e, p. 867)

MCQ 11. A neonate with kernicterus presents with which clinical triad in the chronic phase?

A) Hypotonia, hepatomegaly, petechiae
B) Choreoathetoid cerebral palsy, high-frequency deafness, upward gaze palsy
C) Spastic diplegia, mental retardation, seizures
D) Macrocephaly, bulging fontanelle, sunset sign
E) Opisthotonos, fever, hypoglycaemia

Answer: B — Choreoathetoid cerebral palsy, high-frequency deafness, upward gaze palsy *The classic chronic kernicterus triad. Acute features include lethargy, high-pitched cry, opisthotonos, and seizures. Approximately 50% of affected infants die acutely. (Bradley & Daroff's Neurology, p. 1250)

MCQ 12. Phototherapy works in neonatal jaundice by:

A) Increasing hepatic glucuronosyltransferase activity
B) Converting unconjugated bilirubin to a water-soluble isomer excreted in urine
C) Oxidising conjugated bilirubin in bile
D) Stimulating albumin binding of bilirubin
E) Reducing enterohepatic recirculation of bilirubin

Answer: B — Converting unconjugated bilirubin to a water-soluble photoisomer *Blue-light phototherapy (wavelength ~460 nm) converts bilirubin IXα to lumirubin and other soluble photoisomers that bypass hepatic conjugation and are excreted in bile and urine. (Robbins Basic Pathology; Medical Physiology)

MCQ 13. Which of the following is the MOST common complication seen in preterm neonates?

A) Biliary atresia
B) Congenital heart disease
C) Neonatal respiratory distress syndrome (hyaline membrane disease)
D) Pyloric stenosis
E) Hirschsprung disease

Answer: C — Neonatal RDS (hyaline membrane disease) *RDS is the single most common serious complication of prematurity, along with sepsis, necrotising enterocolitis, and intraventricular haemorrhage. (Robbins & Kumar Pathologic Basis of Disease)

MCQ 14. A newborn boy has bleeding from the umbilical stump and circumcision site on day 3 of life. Coagulation screen shows prolonged PT and APTT with normal platelet count. The MOST likely cause is:

A) Haemophilia A
B) Disseminated intravascular coagulation
C) Thrombocytopenia
D) Haemorrhagic disease of the newborn (Vitamin K deficiency)
E) Von Willebrand disease

Answer: D — Haemorrhagic disease of the newborn *Transitory deficiency of vitamin K-dependent clotting factors (II, VII, IX, X) causes bleeding in the first postnatal week. Poor placental transfer of Vitamin K and low breast milk content are the main causes. IM Vitamin K at birth is preventive. (Bradley & Daroff's Neurology, p. 1250)

MCQ 15. Neonatal polycythaemia is defined as a central haematocrit of:

A) ≥50%
B) ≥55%
C) ≥60%
D) ≥65%
E) ≥70%

Answer: D — ≥65% *Neonatal polycythaemia is defined as a central haematocrit ≥65%. Associated complications include hypoglycaemia, hypocalcaemia, and thrombocytopenia. Treatment includes partial exchange transfusion, hydration, and correction of metabolic disorders. (Bradley & Daroff's Neurology)

SAQs — Neonatology

SAQ 3. Describe the pathophysiology, clinical features, and management of neonatal respiratory distress syndrome (RDS/hyaline membrane disease).

Model Answer:

Pathophysiology:

Caused by deficiency of pulmonary surfactant (dipalmitoylphosphatidylcholine) in immature lungs, typically <34 weeks gestation
Without surfactant, alveolar surface tension is high → alveolar collapse on expiration → ↓ lung compliance
Hypoxia → capillary damage → fibrin-rich exudate lines alveoli ("hyaline membranes")

Clinical Features:

Onset within hours of birth in preterm neonate
Tachypnoea, nasal flaring, intercostal/subcostal retractions, expiratory grunting
Cyanosis, progressive hypoxia
CXR: bilateral ground-glass opacity with air bronchograms, reduced lung volume

Management:

Prevention: Antenatal corticosteroids (betamethasone/dexamethasone) to mother if preterm delivery anticipated — accelerates fetal lung maturity
Treatment:
- Supplemental oxygen / mechanical ventilation / CPAP
- Exogenous surfactant (intratracheal instillation) — cornerstone of treatment
- Supportive: warmth, glucose, fluids, antibiotics if sepsis suspected

SAQ 4. Outline the causes, clinical features, and management of neonatal jaundice, distinguishing physiological from pathological causes.

Model Answer:

Physiological Jaundice:

Onset day 2–3, peaks day 3–5, resolves by day 14 in term infants
Caused by: high neonatal RBC turnover (fetal Hb replacement), immature hepatic UGT enzyme, increased enterohepatic bilirubin recirculation
Management: observation; phototherapy if bilirubin nears treatment threshold

Pathological Jaundice (suspect if):

Appears within 24 hours of birth → think haemolytic disease (Rh or ABO incompatibility)
Conjugated bilirubin elevated → always abnormal → investigate (biliary atresia, neonatal hepatitis, sepsis, metabolic)
Persists >2 weeks (term) or >3 weeks (preterm) without explanation

Causes of unconjugated hyperbilirubinaemia:

Haemolytic: Rh/ABO incompatibility, G6PD deficiency, hereditary spherocytosis
Non-haemolytic: physiological, breast milk, Crigler-Najjar, Gilbert's

Management:

Phototherapy: first-line for elevated unconjugated bilirubin; blue light (460 nm) converts to soluble photoisomers
Exchange transfusion: for rapidly rising bilirubin, imminent or actual kernicterus risk, failure of phototherapy
Treat underlying cause (antibiotics for sepsis, etc.)

SAQ 5. What is kernicterus? Describe its acute presentation, chronic sequelae, and preventive measures.

Model Answer:

Definition: Bilirubin-induced neurological dysfunction caused by deposition of unconjugated bilirubin in the basal ganglia and brainstem nuclei; most dangerous in low-birth-weight and preterm infants
Risk threshold: Bilirubin >340 µmol/L (20 mg/dL) in term infants

Acute Phase:

Lethargy, poor feeding, hypotonia
High-pitched cry, fever
Opisthotonos (backward arching of trunk)
Seizures → ~50% mortality

Chronic Sequelae (survivors):

Choreoathetoid cerebral palsy
High-frequency sensorineural deafness
Upward gaze palsy
Mental retardation, learning deficits

Prevention:

Universal bilirubin screening before discharge
Phototherapy when bilirubin approaches treatment threshold (AAP nomograms)
Exchange transfusion for dangerous levels
(Tietz Laboratory Medicine 7e; Bradley & Daroff's Neurology, p. 1250)

LAQ — Neonatology

LAQ 2. Write a comprehensive account of the common problems of the preterm neonate, their pathophysiology, clinical features, and management.

Outline:

1. Definition

Preterm: birth before 37 completed weeks of gestation
Very preterm: <32 weeks; Extremely preterm: <28 weeks

2. Neonatal Respiratory Distress Syndrome (RDS)

Cause: Surfactant deficiency → alveolar collapse
Features: Grunting, tachypnoea, retractions, ground-glass CXR within hours
Management: Antenatal steroids, CPAP/ventilation, exogenous surfactant

3. Intraventricular Haemorrhage (IVH)

Bleeding from the fragile germinal matrix into the ventricles
Graded I–IV; Grade III–IV carries high risk of hydrocephalus and neurodevelopmental disability
Managed supportively; severe cases may need ventriculoperitoneal shunt

4. Necrotising Enterocolitis (NEC)

Ischaemic/inflammatory necrosis of intestinal wall, usually ileum and colon
Presents: abdominal distension, bloody stools, feeding intolerance, systemic sepsis
CXR/AXR: pneumatosis intestinalis (air in bowel wall), portal venous gas
Management: nil by mouth, IV antibiotics, surgical resection if perforation

5. Neonatal Sepsis

Early onset (<72 hours): GBS, E. coli (maternal flora)
Late onset (>72 hours): Staphylococcus aureus, coagulase-negative Staph, Gram-negatives
Features: temperature instability, lethargy, poor feeding, apnoea, hypoglycaemia
Management: blood culture, lumbar puncture, empirical IV antibiotics (ampicillin + gentamicin)

6. Hypoglycaemia

Definition: blood glucose <2.6 mmol/L (<47 mg/dL) in a neonate
Risk groups: SGA, preterm, LGA (diabetic mothers), hypothermic infants
Features: jitteriness, apnoea, lethargy, seizures
Management: early feeding, IV dextrose if symptomatic or glucose persistently low

7. Jaundice

Physiological more pronounced and prolonged in preterm (immature liver)
Lower phototherapy thresholds used in preterms
Monitor for kernicterus risk

8. Haemorrhagic Disease of the Newborn

Vitamin K deficiency → prolonged PT/APTT, normal platelets
Bleeding from umbilicus, GI tract, intracranially
Prevention: IM Vitamin K 1 mg at birth

9. Temperature Regulation

Preterm infants lack subcutaneous fat and brown adipose tissue → hypothermia rapidly
Management: incubator/warmer, kangaroo mother care

10. General Supportive Care

IV fluids, parenteral nutrition initially
Minimal handling, developmental positioning
Family-centred care and kangaroo care when stable

Sources: Robbins & Kumar Pathologic Basis of Disease (10e); Robbins Basic Pathology; Bradley & Daroff's Neurology in Clinical Practice; Tietz Textbook of Laboratory Medicine 7e; Textbook of Family Medicine 9e; Harriet Lane Handbook 23e

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