Neonatology Practice Questions

Q: The classic triad of congenital rubella syndrome includes which of the following, except?

Retinal detachment. **Explanation:** The classic triad of **Congenital Rubella Syndrome (CRS)**, also known as **Gregg’s Triad**, is a high-yield topic in NEET-PG. It occurs when the rubella virus crosses the placenta during the first trimester, leading to multi-organ malformations. **Why Retinal Detachment is the Correct Answer:** Retinal detachment is **not** part of the classic triad. While CRS causes significant ocular pathology, the characteristic finding is **"Salt and Pepper Retinopathy"** (mottled pigmentation of the retina), which usually does not affect vision. Other ocular features include microphthalmia and glaucoma, but not typically detachment. **Analysis of the Classic Triad (Incorrect Options):** * **Cataract (Option A):** This is the most common ocular manifestation. It is often bilateral and presents as a "pearly white" nuclear opacity. * **Sensorineural Deafness (Option B):** This is the **most common** overall manifestation of CRS. It may be the only finding in late-onset cases. * **Congenital Heart Disease (Option D):** The most characteristic cardiac lesion is **Patent Ductus Arteriosus (PDA)**, followed by peripheral pulmonary artery stenosis. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Period:** Maximum risk of fetal damage is during the first 12 weeks of gestation. * **Dermal Erythropoiesis:** Infants may present with a **"Blueberry muffin rash"** (purpuric skin lesions). * **Diagnosis:** Presence of **IgM antibodies** in the newborn or persistence of IgG beyond 6 months. * **Prevention:** Live attenuated **RA 27/3 vaccine**. It must be avoided during pregnancy, and pregnancy should be avoided for 1 month post-vaccination.

Q: Which of the following is true about erythema toxicum neonatorum?

Resolves spontaneously and requires no treatment. **Explanation:** **Erythema Toxicum Neonatorum (ETN)** is a common, benign, self-limiting cutaneous condition seen in approximately 50% of full-term newborns. 1. **Why Option B is Correct:** ETN is a physiological phenomenon, not an infection. The lesions are transient and typically peak at 24–48 hours of life. Because it is benign and asymptomatic (infants remain otherwise healthy), the management is strictly **observation**. It resolves spontaneously within 5–7 days without any intervention. 2. **Why Other Options are Incorrect:** * **Option A:** Since the etiology is non-infectious, antibiotics are unnecessary. Diagnosis is clinical; however, a Tzanck smear would show eosinophils, not bacteria. * **Option C:** The hallmark histological finding of ETN is **eosinophils**, not neutrophils. A classic NEET-PG trap is confusing ETN with *Transient Neonatal Pustular Melanosis (TNPM)*, which is characterized by neutrophils. * **Option D:** ETN typically appears within the first **24 to 72 hours** of birth. It rarely occurs after 10–14 days of life. Onset after 4 weeks would suggest other diagnoses like infantile acne or seborrheic dermatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Appearance:** "Flea-bite" appearance—small erythematous macules, papules, or pustules on an erythematous base. * **Distribution:** Spares the **palms and soles** (unlike Syphilis or TNPM). * **Microscopy:** Wright stain of pustule contents reveals **innumerable eosinophils**. * **Predisposition:** More common in term infants with higher birth weights; rare in premature neonates.

Q: A newborn infant presents with intermittent cyanosis that improves with crying and worsens when quiet. What is the most likely diagnosis?

Choanal atresia. **Explanation:** The clinical presentation of **intermittent cyanosis that improves with crying and worsens during feeding or rest** is the classic hallmark of **Choanal Atresia**. **1. Why Choanal Atresia is correct:** Newborns are **obligate nasal breathers** until approximately 4–6 months of age. Choanal atresia involves a bony or membranous obstruction of the posterior nasal passage. When the infant is quiet or feeding, the mouth is closed, leading to upper airway obstruction and cyanosis. However, when the infant **cries**, they breathe through their **mouth**, bypassing the nasal obstruction, which leads to an immediate improvement in oxygenation and skin color. **2. Why the other options are incorrect:** * **Diaphragmatic Hernia:** Typically presents with immediate respiratory distress, a scaphoid abdomen, and shifted heart sounds. Cyanosis usually **worsens with crying** as the infant swallows air, further compressing the lungs. * **Cyanotic Congenital Heart Disease:** Cyanosis in cardiac lesions (like Tetralogy of Fallot or TGA) is generally persistent and typically **worsens with crying** (e.g., a "Tet spell") due to increased right-to-left shunting. * **Tracheal Agenesis:** This is a rare, fatal condition presenting with immediate, severe respiratory failure at birth and an inability to intubate. It does not present with intermittent cyanosis. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Failure to pass a 6F or 8F suction catheter through the nose into the nasopharynx. * **Gold Standard Investigation:** Non-contrast CT scan of the paranasal sinuses (shows narrowing of the posterior choanae). * **Management:** Immediate stabilization with an **Oral (McGovern) airway**; definitive treatment is surgical repair. * **Association:** Often part of the **CHARGE syndrome** (Coloboma, Heart defects, Atresia choanae, Retarded growth, Genitourinary anomalies, Ear anomalies).

Q: When severe dehydration in a neonate occurs, what is the recommended fluid replacement amount in the first hour?

20–40 mL/kg. In neonatology, the management of severe dehydration or hypovolemic shock requires rapid volume expansion to restore organ perfusion and prevent multi-organ dysfunction. ### **Explanation of the Correct Answer** **Option A (20–40 mL/kg)** is the correct choice based on standard neonatal resuscitation and stabilization protocols (such as AIIMS and WHO guidelines). For a neonate in shock or with severe dehydration, the initial bolus is **20 mL/kg** of isotonic crystalloid (Normal Saline or Ringer’s Lactate) given over 15–20 minutes. If there is no clinical improvement, a second bolus of **20 mL/kg** is administered, totaling **40 mL/kg** within the first hour. ### **Analysis of Incorrect Options** * **Options B & C (5–15 mL/kg):** These volumes are insufficient for severe dehydration. While smaller volumes (10 mL/kg) may be used in specific cases like preterm infants with suspected cardiac dysfunction or HIE to avoid fluid overload, they are not the standard for severe hypovolemic shock. * **Option D (15–20 mL/kg):** While 20 mL/kg is the standard *initial* bolus, the question asks for the amount in the *first hour*. Since many neonates require a repeat bolus to achieve stability, the range of 20–40 mL/kg is more clinically accurate for the total first-hour management. ### **NEET-PG High-Yield Pearls** * **Fluid of Choice:** Always use **Isotonic Crystalloids** (0.9% NS or RL). Never use 5% Dextrose or hypotonic solutions for boluses. * **Assessment:** Improvement is marked by a decrease in heart rate, improved capillary refill time ( 1 mL/kg/hr). * **Preterm Caution:** In very low birth weight (VLBW) infants, boluses should be given more cautiously (over 30–60 mins) to reduce the risk of Intraventricular Hemorrhage (IVH).

Q: Which of the following is NOT a component of VACTERL association?

Aniridia. **Explanation:** The **VACTERL association** is a non-random co-occurrence of birth defects. It is a diagnosis of exclusion, typically requiring at least **three** of the component anomalies to be present. **Why Aniridia is the correct answer:** **Aniridia** (absence of the iris) is not a component of VACTERL. Instead, it is a hallmark of the **WAGR syndrome** (Wilms tumor, Aniridia, Genitourinary anomalies, and Range of developmental delays), which is caused by a microdeletion on chromosome 11. **Analysis of incorrect options (Components of VACTERL):** * **V – Vertebral anomalies:** Most commonly hemivertebrae or sacral agenesis. * **A – Anal atresia:** Often associated with rectovestibular or rectourethral fistulas. * **C – Cardiac defects:** Ventricular Septal Defect (VSD) is the most common. * **TE – Tracheoesophageal fistula (Option A):** Usually presents with esophageal atresia. * **R – Renal anomalies (Option B):** Includes renal agenesis, dysplasia, or hydronephrosis. * **L – Limb defects (Option C):** Classically **Radial dysplasia** (radial aplasia/hypoplasia) or polydactyly. **High-Yield Clinical Pearls for NEET-PG:** * **Intelligence:** Children with VACTERL association typically have **normal intelligence**, unlike many other chromosomal syndromes. * **Single Umbilical Artery:** This is a common prenatal finding associated with VACTERL. * **Initial Screening:** If VACTERL is suspected, the first step is often a chest X-ray (vertebral/rib issues) and an echocardiogram. * **Differential:** Do not confuse VACTERL with **CHARGE syndrome** (Coloboma, Heart defects, Atresia choanae, Retardation, Genital, and Ear anomalies).

Q: What is the birth weight of a baby considered to be low birth weight?

Less than 2500 g. **Explanation:** The classification of birth weight is a fundamental concept in neonatology, standardized by the World Health Organization (WHO) to identify infants at higher risk for morbidity and mortality. **1. Why Option C is Correct:** A **Low Birth Weight (LBW)** infant is defined as any neonate with a birth weight of **less than 2500 grams (up to and including 2499 g)**, regardless of the gestational age. This threshold is clinically significant because infants below this weight have a significantly higher risk of complications such as hypothermia, hypoglycemia, and infections. **2. Why Other Options are Incorrect:** * **Option A (<1800 g):** This does not correspond to a standard WHO classification. However, weights below 1500 g are classified as Very Low Birth Weight (VLBW). * **Option B (<2000 g):** While these infants are high-risk, 2000 g is not the official cutoff for LBW. * **Option D (<3000 g):** The average birth weight for an Indian neonate is approximately 2.7 to 2.9 kg. A weight of 2500–3000 g is considered normal, though on the lower side of the distribution. **3. NEET-PG High-Yield Clinical Pearls:** To excel in NEET-PG, remember the specific sub-classifications of birth weight: * **Low Birth Weight (LBW):** 4000 g (often associated with maternal diabetes). * **Note:** LBW can be due to either **prematurity** (born before 37 weeks) or **Intrauterine Growth Restriction (IUGR)**. The most common cause of LBW in India is IUGR due to maternal malnutrition and anemia.

Q: Which of the following is NOT associated with jaundice in infancy?

Maple syrup urine disease. **Explanation:** The correct answer is **Maple Syrup Urine Disease (MSUD)**. MSUD is an amino acidopathy caused by a deficiency in the branched-chain alpha-keto acid dehydrogenase complex, leading to the accumulation of Leucine, Isoleucine, and Valine. Clinically, it presents with poor feeding, vomiting, seizures, and a characteristic "maple syrup" odor in the urine. Crucially, it causes **neurological deterioration** rather than hepatic dysfunction or hyperbilirubinemia. **Analysis of other options:** * **Galactosemia:** A classic cause of neonatal jaundice. Deficiency of GALT (Galactose-1-phosphate uridyltransferase) leads to the accumulation of toxic metabolites, causing **conjugated hyperbilirubinemia**, hepatomegaly, cataracts, and *E. coli* sepsis. * **Hereditary Fructose Intolerance (HFI):** Caused by Aldolase B deficiency. While it presents later (when fructose/sucrose is introduced), it manifests with acute liver failure, hypoglycemia, and **jaundice**. * **Crigler-Najjar Syndrome:** A disorder of bilirubin conjugation due to the absence (Type I) or deficiency (Type II) of the enzyme **UGT1A1**, leading to severe **unconjugated hyperbilirubinemia** and risk of kernicterus. **NEET-PG High-Yield Pearls:** * **MSUD:** Look for "alternating hypertonia/hypotonia" and "sweet-smelling urine." * **Galactosemia:** Suspect in a neonate with jaundice, hepatomegaly, and **reducing substances in urine** (but negative glucose dipstick). * **Inborn Errors of Metabolism (IEM):** If an IEM presents with jaundice and liver signs, think Galactosemia, Tyrosinemia, or HFI. If it presents with purely neurological signs/acidosis, think MSUD or Organic Acidemias.

Question 1

The classic triad of congenital rubella syndrome includes which of the following, except?

Accepted Answer

Retinal detachment

Answer

Cataract

Answer

Deafness

Answer

Congenital heart disease (CHD)

Question 2

A baby is born prematurely at 29 weeks gestation by caesarean delivery for fetal distress. The neonate develops tachypnea, nasal flaring, subcostal and intercostal retractions immediately after birth. Chest radiography shows bilateral, diffuse, ground glass appearance, air bronchograms, and poor lung expansion. What is the best treatment plan for this neonate?

Accepted Answer

Surfactant administration and respiratory support

Answer

Oxygen therapy

Answer

Emergency surgical repair of tracheoesophageal fistula

Answer

Observation only

Question 3

A 28-week pregnant multigravida has an abnormal glucose tolerance test. Her previous child weighed 4 kg at birth. Which of the following is TRUE about infants of diabetic mothers?

Accepted Answer

A high incidence of congenital heart anomalies is common in infants of diabetic mothers.

Answer

Hyperglycemia occurs in all infants of diabetic mothers.

Answer

Infants are typically small for gestational age.

Answer

There is a high incidence of metabolic syndrome in later life.

Question 4

Which of the following is true about erythema toxicum neonatorum?

Accepted Answer

Resolves spontaneously and requires no treatment

Answer

Requires antibiotic treatment after obtaining culture and sensitivity results from the lesion

Answer

Characterized by neutrophil-laden lesions

Answer

Usually occurs after 4 weeks of birth

Question 5

A newborn infant presents with intermittent cyanosis that improves with crying and worsens when quiet. What is the most likely diagnosis?

Accepted Answer

Choanal atresia

Answer

Diaphragmatic hernia

Answer

Congenital heart disease (Cyanotic)

Answer

Tracheal agenesis

Question 6

When severe dehydration in a neonate occurs, what is the recommended fluid replacement amount in the first hour?

Accepted Answer

20–40 mL/kg

Answer

5–10 mL/kg

Answer

10–15 mL/kg

Answer

15–20 mL/kg

Question 7

Which of the following is NOT a component of VACTERL association?

Accepted Answer

Aniridia

Answer

Tracheoesophageal fistula

Answer

Renal agenesis

Answer

Radial aplasia

Question 8

What is the birth weight of a baby considered to be low birth weight?

Accepted Answer

Less than 2500 g

Answer

Less than 1800 g

Answer

Less than 2000 g

Answer

Less than 3000 g

Question 9

Which of the following is NOT associated with jaundice in infancy?

Accepted Answer

Maple syrup urine disease

Answer

Hereditary fructose intolerance

Answer

Galactosemia

Answer

Crigler-Najjar syndrome

Question 10

A neonate with respiratory distress and the given chest X-ray most likely has which of the following conditions?

Accepted Answer

Congenital lobar emphysema

Answer

Cystic fibrosis

Answer

Congenital cystic adenomatoid malformation

Answer

Pneumonia

Neonatology — MCQs

Neonatology — MCQs

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