Neonatology Practice Questions

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.

Q: About trisomy 13, which of the following is a true statement?

Bilateral microphthalmia. **Explanation:** Trisomy 13, also known as **Patau Syndrome**, is a severe chromosomal anomaly characterized by a failure of midline development and defects in the prechordal mesoderm. **1. Why Option A is Correct:** Bilateral **microphthalmia** (abnormally small eyes) is a classic midline defect associated with Patau Syndrome. It often occurs alongside other ocular anomalies like coloboma or anophthalmia. The syndrome is defined by the "3 Ps": **P**olydactyly, **P**alates (Cleft lip/palate), and **P**unched-out scalp lesions (Aplasia cutis congenita). **2. Why the other options are incorrect:** * **Neurofibroma (B):** These are benign nerve sheath tumors characteristic of **Neurofibromatosis Type 1**, an autosomal dominant neurocutaneous syndrome, not a chromosomal trisomy. * **Rocker bottom feet (C):** While seen in Patau Syndrome, this is the **hallmark feature of Trisomy 18 (Edwards Syndrome)**. In NEET-PG, if forced to choose the most specific association, rocker bottom feet are classically linked to Edwards, whereas polydactyly is linked to Patau. * **Dermoid cyst (D):** These are developmental choristomas commonly found in the ovary or near the eyebrow. They are not a specific or diagnostic feature of Trisomy 13. **High-Yield Clinical Pearls for NEET-PG:** * **Holoprosencephaly:** The most severe neurological finding in Patau Syndrome (failure of the forebrain to divide). * **Aplasia Cutis Congenita:** Focal absence of skin on the scalp; a very high-yield "spotter" for Patau. * **Echogenic intracardiac focus:** Often seen on prenatal ultrasound. * **Prognosis:** Extremely poor; most infants do not survive beyond the first year of life.

Q: Which vitamin is administered to newborns to prevent hemorrhage?

Vitamin K. **Explanation:** **Correct Answer: A. Vitamin K** Newborns are naturally deficient in Vitamin K because it crosses the placenta poorly, and the neonatal gut is sterile (lacking the bacteria required for Vitamin K synthesis). Vitamin K is essential for the γ-carboxylation of clotting factors **II, VII, IX, and X**. Without it, infants are at high risk for **Vitamin K Deficiency Bleeding (VKDB)**, formerly known as Hemorrhagic Disease of the Newborn. To prevent this, a single intramuscular dose of 1 mg Vitamin K (Phytonadione) is routinely administered to all newborns within one hour of birth. **Incorrect Options:** * **Vitamin E:** While it is an antioxidant that prevents hemolysis in preterm infants, it does not play a direct role in the coagulation cascade. * **Vitamin D:** Essential for calcium homeostasis and bone health. Supplementation (400 IU/day) is recommended for breastfed infants to prevent rickets, but it does not prevent hemorrhage. * **Vitamin A:** Important for vision and immune function. Supplementation is part of the national immunization schedule starting at 9 months, not at birth for hemorrhage prevention. **High-Yield Clinical Pearls for NEET-PG:** * **VKDB Classification:** * *Early:* Within 24 hours (usually due to maternal drugs like anticonvulsants). * *Classic:* Days 2–7 (due to low intake/sterile gut). * *Late:* Weeks 2–12 (associated with exclusive breastfeeding or malabsorption). * **Route:** Intramuscular (IM) is preferred over oral due to better absorption and efficacy in preventing late VKDB. * **Dose:** 1 mg for infants >1500g; 0.5 mg for infants ≤1500g.

Q: What is the ponderal index in malnourished babies?

Less than 2. **Explanation:** The **Ponderal Index (PI)** is a critical anthropometric tool used to assess fetal and neonatal growth, particularly to differentiate between types of Intrauterine Growth Restriction (IUGR). It is calculated using the formula: **PI = [Weight (in grams) / Length (in cm)³] × 100** **Why Option B is Correct:** In healthy, term neonates, the normal Ponderal Index is typically between **2.2 and 3.0**. A value **less than 2** is the diagnostic cutoff for malnutrition or **Asymmetric IUGR** (wasted babies). In these cases, the baby’s weight is significantly reduced relative to their length because weight gain is affected in the third trimester while skeletal growth is relatively preserved (the "brain-sparing" effect). **Analysis of Incorrect Options:** * **Option A (<1):** This value is physiologically incompatible with life in a term neonate; even severely malnourished infants rarely fall below 1.5. * **Options C & D (<4 and <6):** These values are too high. A PI above 3.0 actually indicates a "short and fat" baby, often seen in infants of diabetic mothers (macrosomia). **NEET-PG High-Yield Pearls:** * **Asymmetric IUGR:** Low PI (<2). Caused by placental insufficiency (e.g., PIH). Better prognosis. * **Symmetric IUGR:** Normal PI (but low absolute weight/length). Caused by early insults like chromosomal anomalies or TORCH infections. * **Clinical Utility:** PI is more sensitive than weight-for-gestational-age alone in identifying neonates at risk for metabolic complications like hypoglycemia and hypothermia. * **Rule of Thumb:** If the baby looks "old man-like" with loose skin folds, the PI will almost certainly be <2.

Q: A premature baby born to a diabetic mother presented with respiratory distress and was admitted to the neonatal intensive care unit. Which of the following findings indicates Respiratory Distress Syndrome (RDS) in a newborn?

Presence of an air bronchogram on chest X-ray. **Explanation:** **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant, leading to alveolar collapse and decreased lung compliance. **Why Option C is Correct:** The hallmark radiological finding in RDS is a **"ground-glass appearance"** (diffuse reticulogranular opacities) with a prominent **air bronchogram**. An air bronchogram occurs when air-filled bronchi are visualized against the backdrop of collapsed (opaque) alveoli. This is a classic sign of parenchymal lung disease like RDS. **Why the Other Options are Incorrect:** * **Option A:** RDS typically presents **immediately at birth** or within the first few hours (usually <6 hours). A delayed onset often suggests other etiologies like pneumonia or sepsis. * **Option B:** Antenatal corticosteroids (e.g., Betamethasone) are a **preventive measure**. They accelerate fetal lung maturity and surfactant production, thereby *reducing* the risk and severity of RDS. * **Option D:** RDS is a disease of **prematurity**. While infants of diabetic mothers (IDM) are at higher risk due to insulin-mediated inhibition of surfactant synthesis, the risk is significantly higher in preterm babies. Term babies are more likely to present with Transient Tachypnea of the Newborn (TTN) or Meconium Aspiration Syndrome (MAS). **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Prematurity (most common), Maternal Diabetes, Cesarean section without labor, and Male gender. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates lung immaturity. * **Management:** The definitive treatment is **Exogenous Surfactant replacement** (administered via ET tube) and respiratory support (CPAP or mechanical ventilation). * **Silverman-Anderson Score:** Used to grade the severity of respiratory distress in neonates (higher score = more severe distress).

Q: A boy presents with multiple bullous lesions on his trunk and periostitis observed on x-rays. What is the most appropriate next investigation?

VDRL testing for mother and child. ### Explanation The clinical presentation of **bullous lesions** (Pemphigus syphiliticus) and **periostitis** in an infant is highly suggestive of **Congenital Syphilis**. **1. Why Option A is Correct:** Congenital syphilis is caused by the transplacental transmission of *Treponema pallidum*. The classic early manifestations (appearing before age 2) include: * **Cutaneous signs:** Vesiculobullous lesions (often on palms and soles) or a maculopapular rash. * **Skeletal signs:** Periostitis (inflammation of the periosteum) and osteochondritis (e.g., Wimberger’s sign). The standard screening protocol involves non-treponemal tests like **VDRL or RPR**. Testing both the mother and the child is essential to correlate titers; a neonatal titer fourfold higher than the maternal titer is diagnostic. **2. Why Other Options are Incorrect:** * **Option B (PCR for TB):** While TB can cause osteomyelitis, it does not typically present with acute bullous lesions in neonates. * **Option C (HBsAg):** Hepatitis B in neonates is usually asymptomatic at birth and does not cause periostitis or bullous skin eruptions. * **Option D (ELISA):** While ELISA can be used for various infections (like HIV), VDRL remains the gold standard initial screening tool for syphilis due to its ability to monitor treatment response via titers. **Clinical Pearls for NEET-PG:** * **Snuffles:** Early-onset syphilitic rhinitis (highly infectious discharge). * **Wimberger’s Sign:** Focal erosion of the medial proximal tibial metaphysis. * **Hutchinson’s Triad (Late Syphilis):** Interstitial keratitis, sensorineural hearing loss, and Hutchinson teeth. * **Treatment of Choice:** Parenteral Penicillin G is the mainstay for both maternal and congenital syphilis.

Question 1

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 2

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 3

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 4

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 5

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

Question 6

About trisomy 13, which of the following is a true statement?

Accepted Answer

Bilateral microphthalmia

Answer

Neurofibroma

Answer

Rocker bottom feet

Answer

Dermoid cyst

Question 7

Which vitamin is administered to newborns to prevent hemorrhage?

Accepted Answer

Vitamin K

Answer

Vitamin E

Answer

Vitamin D

Answer

Vitamin A

Question 8

What is the ponderal index in malnourished babies?

Accepted Answer

Less than 2

Answer

Less than 1

Answer

Less than 4

Answer

Less than 6

Question 9

A premature baby born to a diabetic mother presented with respiratory distress and was admitted to the neonatal intensive care unit. Which of the following findings indicates Respiratory Distress Syndrome (RDS) in a newborn?

Accepted Answer

Presence of an air bronchogram on chest X-ray

Answer

Onset of symptoms after 6 hours of age

Answer

Antenatal corticosteroid therapy administered to the mother

Answer

The baby being born at term gestation

Question 10

A boy presents with multiple bullous lesions on his trunk and periostitis observed on x-rays. What is the most appropriate next investigation?

Accepted Answer

VDRL testing for mother and child

Answer

PCR for maternal tuberculosis

Answer

HBsAg screening

Answer

ELISA testing for mother and child

Neonatology — MCQs

Neonatology — MCQs

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