Neonatology Practice Questions

Q: What is the most common cause of seizures in a newborn on day 1 of life?

Hypoxia. **Explanation:** **Hypoxic-Ischemic Encephalopathy (HIE)**, resulting from perinatal asphyxia, is the most common cause of neonatal seizures, accounting for approximately 60-80% of cases. These seizures typically manifest within the **first 24 hours of life** (Day 1). The underlying mechanism involves a lack of oxygen and blood flow to the brain, leading to ATP depletion, failure of the sodium-potassium pump, and neuronal depolarization. **Analysis of Options:** * **Hypoxia (Correct):** The primary cause of seizures on Day 1. It often presents as subtle or clonic seizures in a neonate with a history of fetal distress or low Apgar scores. * **Hypocalcemia:** Early-onset hypocalcemia (first 72 hours) is common in infants of diabetic mothers or preterm babies, but it is a less frequent primary cause than HIE. Late-onset hypocalcemia (after 72 hours) is usually due to high phosphate intake (cow's milk). * **Hypoglycemia:** While a common metabolic trigger, it usually occurs in the context of other stressors or specific risk factors (SGA, IDM) and is statistically less common than HIE as a solitary cause of seizures on Day 1. * **Intrauterine Infections (TORCH):** These typically present with other systemic signs (hepatosplenomegaly, rash, microcephaly) and are a much rarer cause of acute seizures compared to birth asphyxia. **High-Yield Clinical Pearls for NEET-PG:** * **Timing is Key:** * **0–24 hours:** HIE (Most common), Hypoglycemia. * **24–72 hours:** Intraventricular hemorrhage (IVH), Subarachnoid hemorrhage, Metabolic disorders. * **>72 hours:** Meningitis, Septicemia, Drug withdrawal. * **Drug of Choice:** Phenobarbitone remains the first-line anticonvulsant for neonatal seizures. * **Most common type:** Subtle seizures (e.g., eye blinking, rowing, pedaling) are the most frequent clinical presentation in neonates.

Q: What is the recommended daily protein requirement for a preterm infant?

3.5-4 gm/kg. **Explanation:** The correct answer is **D (3.5-4 gm/kg)**. **Why it is correct:** Preterm infants have significantly higher protein requirements compared to term infants to facilitate "catch-up growth" and match the intrauterine growth rate (the rate at which a fetus would grow during the third trimester). To achieve a weight gain of approximately 15–20 g/kg/day, a high protein-to-energy ratio is essential. Current guidelines (including WHO and ESPGHAN) recommend a protein intake of **3.5 to 4.5 g/kg/day** for very low birth weight (VLBW) infants to prevent postnatal growth restriction and support neurodevelopment. **Why other options are incorrect:** * **A (0.5-1 gm/kg):** This is grossly inadequate and would lead to a negative nitrogen balance and muscle wasting. * **B (1.5-2 gm/kg):** This is the maintenance requirement for an **older child or a term neonate** (approx. 2 g/kg/day), but it is insufficient for the rapid growth needs of a preterm baby. * **C (2.5-3 gm/kg):** While better, this range often results in suboptimal growth in extremely premature infants. It may be acceptable for late preterms, but the standard recommendation for preterm management focuses on the higher 3.5-4 g/kg range. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Requirement:** Preterm infants require **110–130 kcal/kg/day** for adequate growth. * **Protein-Energy Ratio:** For optimal protein utilization, an infant needs roughly 25–30 kcal for every gram of protein. * **Early Initiation:** "Aggressive nutrition" (starting amino acids at 2–3 g/kg/day within the first hours of life) is now standard to prevent the "metabolic shock" of birth. * **Monitoring:** Blood Urea Nitrogen (BUN) and serum albumin are used to monitor if protein intake is adequate or excessive.

Q: After delivery, Caput succedaneum typically disappears within what timeframe?

24-48 hours. **Explanation:** **Caput succedaneum** is a common neonatal scalp condition characterized by a diffuse, edematous swelling of the soft tissues. It is caused by pressure from the cervix on the presenting part of the fetal head during labor, leading to local venous and lymphatic obstruction. 1. **Why A is correct:** Because the fluid is located in the **subcutaneous tissue** (above the periosteum), it is easily reabsorbed by the lymphatic system once the mechanical pressure of labor is removed. This resolution typically occurs rapidly, usually within **24 to 48 hours** after birth. 2. **Why B, C, and D are incorrect:** These timeframes are more characteristic of **Cephalhematoma**. Unlike Caput, a Cephalhematoma is a subperiosteal hemorrhage that takes much longer (weeks to months) to resolve because blood takes longer to organize and resorb than simple edema. **High-Yield Clinical Pearls for NEET-PG:** * **Crosses Sutures:** Caput succedaneum **crosses suture lines** (diffuse), whereas Cephalhematoma is limited by sutures (localized). * **Timing:** Caput is present **at birth**; Cephalhematoma often appears a few hours after birth as the bleeding progresses. * **Complications:** Caput is benign and requires no treatment. Cephalhematoma may lead to jaundice (due to bilirubin from broken-down RBCs) or underlying linear skull fractures. * **Subgaleal Hemorrhage:** Always differentiate these from Subgaleal hemorrhage, which is a surgical emergency involving bleeding between the aponeurosis and periosteum, presenting as a rapidly expanding, fluctuant mass.

Q: Which of the following statements is FALSE regarding kernicterus?

It has no long-term effects.. **Explanation:** **Kernicterus** (Chronic Bilirubin Encephalopathy) is a permanent neurological condition caused by the toxicity of unconjugated bilirubin crossing the blood-brain barrier. 1. **Why Option A is the correct (False) statement:** Kernicterus is characterized by **permanent, irreversible neurological damage**. Long-term effects are severe and include **choreoathetoid cerebral palsy**, sensorineural hearing loss (auditory neuropathy), dental enamel hypoplasia, and upward gaze palsy. Therefore, stating it has "no long-term effects" is medically incorrect. 2. **Analysis of other options:** * **Option B:** In healthy term neonates without hemolysis, the risk of kernicterus significantly increases when serum bilirubin levels exceed **25 mg/dL**. However, in preterm or sick infants, it can occur at much lower levels. * **Option C:** Unconjugated bilirubin is lipid-soluble and has a predilection for specific brain regions. The **basal ganglia** (specifically the globus pallidus and subthalamic nuclei) are the most common sites of deposition, followed by the hippocampus and cranial nerve nuclei. * **Option D:** **Opisthotonus** (severe arching of the back) and retrocollis are hallmark clinical signs of the intermediate and advanced stages of acute bilirubin encephalopathy. **NEET-PG High-Yield Pearls:** * **Earliest sign:** Poor feeding and loss of Moro reflex. * **Most common long-term sequela:** Choreoathetoid Cerebral Palsy. * **MRI Finding:** High-intensity signals in the **globus pallidus** on T2-weighted images. * **Prevention:** Timely use of phototherapy and exchange transfusion based on age-specific nomograms (Bhutani’s Chart).

Q: What is the diagnosis in a baby girl delivered at 30 weeks' gestation?

Congenital cytomegalovirus infection. ***Congenital cytomegalovirus infection*** - The classic **blueberry muffin rash** (purpuric papules) in a preterm neonate is the hallmark of congenital CMV infection. - CMV is the most common **intrauterine infection** and often presents with **IUGR**, **hepatosplenomegaly**, and **thrombocytopenia** in premature infants. *Ecthyma gangrenosum* - Characterized by **necrotic ulcerative lesions** with black eschar centers, typically caused by **Pseudomonas aeruginosa**. - Occurs in **immunocompromised patients** with **septicemia**, not as a congenital condition in neonates. *Homozygous protein C deficiency* - Presents with **purpura fulminans** causing extensive skin necrosis and **warfarin-induced skin necrosis**. - Associated with **thrombotic complications** rather than the blueberry muffin appearance seen in CMV. *Klippel-Trenaunay syndrome* - Features a **port-wine stain**, **varicose veins**, and **limb hypertrophy** (capillary-lymphatic-venous malformation). - This is a **vascular malformation syndrome**, not an infectious process presenting with systemic illness.

Q: What is the definition of hypertension in a full-term newborn?

Mean blood pressure > 70 mm Hg. **Explanation:** In neonatology, blood pressure (BP) values are highly dynamic and depend on gestational age, birth weight, and postnatal age. For a **full-term newborn** (during the first week of life), hypertension is generally defined as a **systolic BP > 90 mmHg** or a **mean arterial pressure (MAP) > 70 mmHg**. The correct answer is **B (Mean BP > 70 mmHg)** because this threshold represents values persistently above the 95th percentile for a healthy term infant. At this level, clinical evaluation for underlying causes (most commonly renal artery thrombosis or renal parenchymal disease) is indicated. **Analysis of Incorrect Options:** * **Option A (> 80 mmHg):** While this value is certainly hypertensive, it is significantly higher than the diagnostic threshold for a newborn. Using this as a definition would delay the diagnosis of neonatal hypertension. * **Option C (> 90 mmHg):** This value is often used as the threshold for **systolic** blood pressure, not mean blood pressure. * **Option D (> 500 mmHg):** This is physiologically impossible and incompatible with life. **High-Yield Facts for NEET-PG:** * **Most common cause:** In neonates, hypertension is usually **secondary**. The most common cause is **umbilical artery catheterization** leading to renal artery embolism/thrombosis. * **Normal MAP Rule of Thumb:** In the first few days of life, the minimum acceptable MAP is roughly equal to the infant's **gestational age in weeks**. * **Measurement:** The gold standard for BP monitoring in sick neonates is **indwelling arterial line** manometry. For screening, the **oscillometric method** (cuff) is used, ensuring the cuff width is 40–50% of the arm circumference.

Question 1

Which of the following does NOT meet the criteria for pathological jaundice?

Accepted Answer

Onset 24 hours or later but within 72 hours

Answer

Persistence for more than 14 days

Answer

Conjugated bilirubin level greater than 2 mg/dL

Answer

Clay-colored stools

Question 2

What is the most common cause of seizures in a newborn on day 1 of life?

Accepted Answer

Hypoxia

Answer

Hypocalcemia

Answer

Hypoglycemia

Answer

Intrauterine infections

Question 3

Which age group most often presents with jaundice due to Omphalitis in infants?

Accepted Answer

3-6 weeks

Answer

At birth

Answer

24-72 hours

Answer

1-3 weeks

Question 4

What is the recommended daily protein requirement for a preterm infant?

Accepted Answer

3.5-4 gm/kg

Answer

0.5-1 gm/kg

Answer

1.5-2 gm/kg

Answer

2.5-3 gm/kg

Question 5

After delivery, Caput succedaneum typically disappears within what timeframe?

Accepted Answer

24-48 hours

Answer

3-5 days

Answer

5-7 days

Answer

7-10 days

Question 6

Which of the following statements is FALSE regarding kernicterus?

Accepted Answer

It has no long-term effects.

Answer

It occurs when bilirubin levels exceed 25 mg%.

Answer

Bilirubin is deposited in the basal ganglia.

Answer

Opisthotonus is a clinical sign.

Question 7

What is the diagnosis in a baby girl delivered at 30 weeks' gestation?

Accepted Answer

Congenital cytomegalovirus infection

Answer

Ecthyma gangrenosum

Answer

Homozygous protein C deficiency

Answer

Klippel-Trenaunay syndrome

Question 8

Two days after birth, a child developed respiratory distress and had a scaphoid abdomen. Breath sounds were decreased on the left side. After bag and mask ventilation, an endotracheal tube was inserted, and the maximal cardiac impulse shifted to the right side. What should be the next step in management?

Accepted Answer

Confirm the position of the endotracheal tube

Answer

Emergency surgery

Answer

Nasogastric tube insertion

Answer

Chest X-ray to confirm the position of the endotracheal tube

Question 9

A neonate continuously regurgitates all feeds and is continuously drooling saliva. Which of the following is the most probable diagnosis?

Accepted Answer

Tracheo-esophageal fistula

Answer

Normal phenomenon

Answer

Congenital hypertrophic pyloric stenosis

Answer

Hirschsprung disease

Question 10

What is the definition of hypertension in a full-term newborn?

Accepted Answer

Mean blood pressure > 70 mm Hg

Answer

Mean blood pressure > 80 mm Hg

Answer

Mean blood pressure > 90 mm Hg

Answer

Mean blood pressure > 500 mm Hg

Neonatology — MCQs

Neonatology — MCQs

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