Neonatology Practice Questions

Q: Infants diagnosed with Intrauterine Growth Restriction (IUGR) at birth are termed as:

Small for gestational age. **Explanation:** **1. Why the correct answer is right:** The term **Small for Gestational Age (SGA)** is a clinical definition based on birth weight. It refers to any neonate whose birth weight is below the **10th percentile** for their specific gestational age. While **Intrauterine Growth Restriction (IUGR)** is a dynamic, antenatal ultrasound diagnosis (indicating a fetus has not reached its biological growth potential due to pathological factors), **SGA** is the term used to describe these infants at birth based on static measurements. **2. Why the incorrect options are wrong:** * **A. Growth retarded:** This is an outdated term. While IUGR stands for growth restriction, the clinical designation of the infant at birth is SGA. * **C. Low birth weight (LBW):** This is a weight-based definition regardless of gestational age. Any infant weighing **<2500g** is LBW. An SGA infant can be LBW, but a preterm infant can also be LBW without being growth-restricted. * **D. Preterm:** This refers strictly to the timing of birth (**<37 completed weeks**). An infant can be SGA but born at full term (e.g., a 40-weeker weighing 2kg). **3. High-Yield Clinical Pearls for NEET-PG:** * **Symmetric IUGR:** Insult occurs early in pregnancy (e.g., chromosomal anomalies, TORCH infections). Both head circumference and body weight are low. * **Asymmetric IUGR:** Insult occurs late (e.g., placental insufficiency, maternal hypertension). "Head sparing" effect is seen; weight is reduced more than head circumference. * **Ponderal Index:** Used to identify asymmetric IUGR. * **Complications of SGA/IUGR:** Hypothermia, **Hypoglycemia** (due to low glycogen stores), **Polycythemia** (due to fetal hypoxia), and Hypocalcemia.

Q: Which of the following disorders is an indication for the use of steroids in neonates?

Bronchopulmonary dysplasia. **Explanation:** **Bronchopulmonary Dysplasia (BPD)** is the correct answer because it is a chronic lung disease characterized by intense inflammation and lung injury in preterm infants. Steroids (such as Dexamethasone or Hydrocortisone) are used due to their potent **anti-inflammatory properties**, which help reduce lung edema, improve lung compliance, and facilitate weaning from mechanical ventilation. However, they are typically reserved for infants who cannot be weaned from the ventilator after 1–2 weeks, as early use is associated with an increased risk of cerebral palsy. **Why other options are incorrect:** * **Pulmonary Hypoplasia:** This is a structural defect where there is an underdevelopment of alveoli and pulmonary vasculature (often secondary to oligohydramnios or diaphragmatic hernia). Steroids do not correct structural lung deficits; management focuses on gentle ventilation and treating associated pulmonary hypertension. * **Oesophageal Atresia:** This is a surgical anatomical anomaly. Steroids have no role in its management, which requires surgical repair to establish esophageal continuity. **High-Yield Clinical Pearls for NEET-PG:** * **DART Protocol:** A low-dose dexamethasone regimen often used to facilitate extubation in BPD. * **Antenatal Steroids:** (Betamethasone/Dexamethasone) are given to the mother to prevent RDS, but **Postnatal Steroids** are specifically used to treat or prevent BPD. * **Side Effects:** Monitor for hyperglycemia, hypertension, intestinal perforation (especially when used with Indomethacin), and long-term neurodevelopmental delays.

Q: Neonatal hypothermia can be prevented by all of the following EXCEPT?

Cold chain. **Explanation:** The correct answer is **Cold chain** because it is a system used for maintaining the potency of vaccines from the point of manufacture to the point of administration. In contrast, neonatal care focuses on maintaining a **Warm chain** to prevent heat loss. **Why the other options are incorrect:** * **Warm Chain:** This is a set of 10 interlinked procedures (e.g., warm delivery room, immediate drying, skin-to-skin contact, breastfeeding) performed at birth and during the following hours to prevent hypothermia. * **Kangaroo Mother Care (KMC):** A proven method for stable low-birth-weight infants involving continuous skin-to-skin contact, which provides effective thermal regulation and promotes breastfeeding. * **Radiant Warmer:** An external heat source used in hospitals to maintain a newborn's body temperature, especially during resuscitation or for sick neonates who require frequent monitoring. **Clinical Pearls for NEET-PG:** * **Definition of Hypothermia:** Axillary temperature **<36.5°C (97.7°F)**. * **Classification:** * Mild (Cold Stress): 36.0°C to 36.4°C * Moderate: 32.0°C to 35.9°C * Severe: <32.0°C * **Mechanism of Heat Production:** Neonates primarily produce heat through **non-shivering thermogenesis** via the metabolism of **brown adipose tissue** (located in the interscapular region, axilla, and around kidneys). * **The "Golden Hour":** The first hour after birth is critical for establishing the warm chain to reduce neonatal morbidity and mortality.

Q: Which of the following is NOT a complication of prematurity?

Retinitis pigmentosa. **Explanation:** The correct answer is **Retinitis pigmentosa (C)** because it is a genetic, degenerative eye disease characterized by the progressive loss of photoreceptor cells (rods and cones). It is not caused by premature birth. In contrast, the ocular complication associated with prematurity is **Retinopathy of Prematurity (ROP)**, which involves abnormal vascularization of the retina due to oxygen toxicity and immaturity. **Why the other options are complications of prematurity:** * **Intraventricular Hemorrhage (IVH):** Premature infants have a highly vascularized, fragile **germinal matrix** that lacks structural support. Fluctuations in cerebral blood flow easily lead to rupture and bleeding into the ventricles. * **Necrotizing Enterocolitis (NEC):** This is the most common gastrointestinal emergency in neonates. It occurs due to a combination of intestinal immaturity, ischemia, and early enteral feeding, leading to mucosal injury and bacterial invasion. * **Periventricular Leukomalacia (PVL):** This refers to white matter injury near the lateral ventricles. It is caused by ischemia or inflammation in the "watershed" areas of the brain, often leading to spastic diplegia (Cerebral Palsy). **High-Yield Clinical Pearls for NEET-PG:** * **IVH Screening:** Routine cranial ultrasound is recommended for all neonates born at **<32 weeks** gestation. * **NEC Radiographic Sign:** The pathognomonic finding on X-ray is **Pneumatosis intestinalis** (air within the bowel wall). * **ROP Screening:** In India, screening is indicated for infants born **≤32 weeks** or birth weight **≤1500g**, or those with an unstable clinical course. * **Surfactant Deficiency:** Remember that Respiratory Distress Syndrome (RDS) is the most common respiratory complication of prematurity.

Q: A woman with a history of repeated abortions gave birth to a low birth weight baby. The child is having rashes over palms and rhinitis. What is the most probable diagnosis?

Congenital syphilis. **Explanation:** The clinical presentation of low birth weight, **rhinitis (snuffles)**, and **rashes over the palms and soles** in a neonate, combined with a maternal history of **repeated abortions**, is a classic triad for **Congenital Syphilis**. 1. **Why Congenital Syphilis is correct:** * **Rhinitis (Snuffles):** This is often the earliest clinical sign, characterized by a highly infectious, white/bloody nasal discharge. * **Palmar/Plantar Rash:** The rash in syphilis typically involves the palms and soles; it may be maculopapular or vesiculobullous (Pemphigus syphiliticus). * **Obstetric History:** *Treponema pallidum* crosses the placenta, often leading to late-term abortions, stillbirths, or prematurity. 2. **Why other options are incorrect:** * **Congenital HIV:** Usually asymptomatic at birth. Clinical features like failure to thrive and opportunistic infections develop later in infancy. * **Congenital Rubella:** Characterized by the "Gregg’s Triad": Cataracts, Sensorineural hearing loss, and Congenital Heart Disease (PDA). It also presents with a "Blueberry muffin" rash, not palmar rhinitis. * **Pemphigus:** While "Pemphigus syphiliticus" refers to the syphilitic rash, "Pemphigus" alone usually refers to an autoimmune blistering disease (Pemphigus vulgaris), which is extremely rare in neonates and not associated with rhinitis or abortions. **High-Yield Clinical Pearls for NEET-PG:** * **Early Congenital Syphilis ( 2 years):** Hutchinson’s teeth, Mulberry molars, Interstitial keratitis, and Eighth nerve deafness (**Hutchinson’s Triad**). * **Screening:** VDRL/RPR (Nonspecific); **Confirmation:** FTA-ABS or TP-PA (Specific). * **Treatment of Choice:** Intravenous Penicillin G for 10 days.

Q: What is the Ponderal's index for a "small for gestational age" child?

Less than 2. **Explanation:** **Ponderal Index (PI)** is a clinical tool used to assess fetal and neonatal growth, specifically to differentiate between symmetrical and asymmetrical intrauterine growth restriction (IUGR). It is calculated using the formula: **PI = [Weight (in grams) × 100] / [Height (in cm)³]** **Why Option B is Correct:** In neonatology, a Ponderal Index **less than 2** is the standard diagnostic threshold for identifying a "Small for Gestational Age" (SGA) infant, particularly those with **asymmetrical IUGR** (wasted appearance). While a normal term infant typically has a PI between 2.2 and 3.0, a value below 2 indicates that the infant’s weight is significantly low relative to their length, suggesting late-pregnancy malnutrition or placental insufficiency. **Why Other Options are Incorrect:** * **Option A (<1):** This value is physiologically incompatible with life in a term or near-term neonate; it would represent extreme, lethal emaciation. * **Option C (<3):** A PI of 2.5 is considered normal. Using <3 as a cutoff would over-diagnose almost all healthy newborns as SGA. * **Option D (<4):** A PI above 3 is often seen in infants of diabetic mothers (macrosomia), where weight is excessive compared to length. **High-Yield Clinical Pearls for NEET-PG:** 1. **Asymmetrical IUGR:** PI is **low (<2)**. This is "Head Sparing" growth restriction, usually due to placental insufficiency in the third trimester. 2. **Symmetrical IUGR:** PI is usually **normal**. Both weight and length are equally affected, often due to early insults like chromosomal anomalies or TORCH infections. 3. **Clinical Utility:** PI is more sensitive than weight-for-gestational-age alone because it accounts for the infant's body proportions.

Q: A neonate born to a mother with hepatitis B infection should be treated with what intervention?

Immunoglobulins and Hepatitis B vaccine. **Explanation:** The primary goal in managing a neonate born to a Hepatitis B surface antigen (HBsAg) positive mother is to prevent **vertical transmission**, which carries a 90% risk of progressing to chronic hepatitis if not addressed. **Why Option D is Correct:** The standard of care is **Post-Exposure Prophylaxis (PEP)** using both passive and active immunization. 1. **Hepatitis B Immune Globulin (HBIG):** Provides immediate, passive immunity to neutralize the virus. 2. **Hepatitis B Vaccine:** Initiates active immunity for long-term protection. When administered within **12 hours of birth** at separate anatomical sites (e.g., opposite thighs), this combination is >90% effective in preventing transmission. **Why Other Options are Incorrect:** * **A. Isolation:** Hepatitis B is transmitted through blood and body fluids, not respiratory droplets. Standard precautions are sufficient; isolation is unnecessary and interferes with maternal-infant bonding. * **B & C. Immunoglobulins or Vaccine alone:** While both provide some protection, monotherapy is significantly less effective than the combination. The vaccine alone takes time to induce antibodies, while HBIG alone provides only temporary protection. **NEET-PG High-Yield Pearls:** * **Timing:** Both HBIG (0.5 mL) and the Vaccine (0.5 mL) must be given within **12 hours**. * **Breastfeeding:** It is **not contraindicated**, provided the infant receives PEP. * **Follow-up:** Post-vaccination serologic testing (HBsAg and anti-HBs) should be performed at **9–12 months** of age. * **Preterm Infants (<2kg):** The birth dose of the vaccine does not count toward the 3-dose series due to potentially lower immunogenicity; they require a total of 4 doses.

Q: A 2-day-old newborn baby presented with microcephaly, macroglossia, visceromegaly, and a blood glucose level of 20 mg/dl. What is the most likely diagnosis?

Beckwith-Wiedemann syndrome. ### Explanation The correct answer is **Beckwith-Wiedemann Syndrome (BWS)**. **1. Why Beckwith-Wiedemann Syndrome is correct:** BWS is a classic **overgrowth disorder** caused by mutations or epigenetic changes on chromosome 11p15 (involving genes like *IGF2*). The clinical presentation in this case perfectly matches the "classic triad" and associated features: * **Macroglossia:** Large tongue (the most common feature). * **Visceromegaly:** Enlargement of abdominal organs (liver, kidneys, spleen). * **Macrosomia:** Large body size (though this patient has microcephaly, which can occasionally occur, the metabolic profile is pathognomonic). * **Hyperinsulinemic Hypoglycemia:** Due to pancreatic islet cell hyperplasia, these neonates present with severe, refractory hypoglycemia (Glucose <40 mg/dl). **2. Why the other options are incorrect:** * **Prader-Willi Syndrome:** Characterized by severe neonatal **hypotonia**, feeding difficulties initially, followed by hyperphagia and obesity. It does not present with macroglossia or visceromegaly. * **Werner Syndrome:** A premature aging disorder (progeria) that typically manifests in the second decade of life, not the neonatal period. * **Cockayne Syndrome:** A rare autosomal recessive disorder featuring growth failure, photosensitivity, and a "bird-like" facies. It is a form of dwarfism, the opposite of the overgrowth seen here. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ear Creases/Pits:** Look for linear creases on the earlobes or pits on the posterior helix in BWS questions. * **Abdominal Wall Defects:** Omphalocele or umbilical hernia are frequently associated. * **Tumor Risk:** Children with BWS have a significantly increased risk of embryonal tumors, most commonly **Wilms tumor** and **Hepatoblastoma**. * **Screening:** Protocol includes abdominal ultrasound every 3 months until age 8 and AFP levels every 3 months until age 4.

Question 1

Probiotics are useful for which of the following conditions?

Accepted Answer

Necrotizing enterocolitis

Answer

Breast milk jaundice

Answer

Hospital acquired pneumonia

Answer

Neonatal seizures

Question 2

Infants diagnosed with Intrauterine Growth Restriction (IUGR) at birth are termed as:

Accepted Answer

Small for gestational age

Answer

Growth retarded

Answer

Low birth weight

Answer

Preterm

Question 3

Which of the following disorders is an indication for the use of steroids in neonates?

Accepted Answer

Bronchopulmonary dysplasia

Answer

Pulmonary hypoplasia

Answer

Oesophageal atresia

Answer

None of the above

Question 4

Neonatal hypothermia can be prevented by all of the following EXCEPT?

Accepted Answer

Cold chain

Answer

Warm chain

Answer

Kangaroo Mother care

Answer

Radiant warmer

Question 5

Which of the following is NOT a complication of prematurity?

Accepted Answer

Retinitis pigmentosa

Answer

Intraventricular hemorrhage

Answer

Necrotizing enterocolitis

Answer

Periventricular leukomalacia

Question 6

A woman with a history of repeated abortions gave birth to a low birth weight baby. The child is having rashes over palms and rhinitis. What is the most probable diagnosis?

Accepted Answer

Congenital syphilis

Answer

Congenital HIV

Answer

Congenital rubella

Answer

Pemphigus

Question 7

What is the Ponderal's index for a "small for gestational age" child?

Accepted Answer

Less than 2

Answer

Less than 1

Answer

Less than 3

Answer

Less than 4

Question 8

A neonate born to a mother with hepatitis B infection should be treated with what intervention?

Accepted Answer

Immunoglobulins and Hepatitis B vaccine

Answer

Isolation

Answer

Immunoglobulins

Answer

Hepatitis B vaccine

Question 9

A 2-day-old newborn baby presented with microcephaly, macroglossia, visceromegaly, and a blood glucose level of 20 mg/dl. What is the most likely diagnosis?

Accepted Answer

Beckwith-Wiedemann syndrome

Answer

Prader-Willi syndrome

Answer

Werner syndrome

Answer

Cockayne syndrome

Question 10

A newborn has Apgar scores of 3 at 1 minute and 6 at 5 minutes. At 10 minutes, the child shows features of breathlessness. Chest X-ray reveals mediastinal shift. What are the possible causes?

Accepted Answer

Pneumothorax

Answer

Bilateral choanal atresia

Answer

Congenital diaphragmatic hernia

Answer

Hyaline membrane disease

Neonatology — MCQs

Neonatology — MCQs

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