Neonatology Practice Questions

Q: Hydrops fetalis may be caused by the following except?

Congenital varicella syndrome. **Explanation:** Hydrops fetalis is defined as the abnormal accumulation of fluid in two or more fetal compartments (e.g., ascites, pleural effusion, pericardial effusion, or skin edema). It is broadly categorized into **Immune** (Rh isoimmunization) and **Non-immune** (90% of cases). **Why Congenital Varicella Syndrome is the correct answer:** While many intrauterine infections (TORCH) like Parvovirus B19, CMV, and Syphilis are notorious causes of non-immune hydrops, **Congenital Varicella Syndrome** typically presents with cicatricial skin scarring, limb hypoplasia, chorioretinitis, and microcephaly. It is **not** a recognized cause of hydrops fetalis. **Analysis of Incorrect Options:** * **Congenital Heart Block:** This is a classic cause of hydrops. It often results from maternal SLE (anti-Ro/SSA and anti-La/SSB antibodies). The resulting bradycardia leads to low cardiac output and high-output heart failure, causing fluid extravasation. * **Cystic Hygroma:** Large lymphatic malformations (often associated with Turner syndrome or Trisomy 21) cause lymphatic obstruction. This leads to impaired venous return and subsequent hydrops. * **Congenital Nephrosis (Finnish type):** This condition involves massive protein loss in utero. The resulting severe hypoproteinemia lowers oncotic pressure, leading to generalized edema and hydrops. **NEET-PG High-Yield Pearls:** * **Most common cause of Non-immune Hydrops:** Cardiovascular anomalies. * **Most common infectious cause:** Parvovirus B19 (due to suppression of erythropoiesis leading to profound anemia). * **Diagnostic marker:** Increased Nuchal Translucency (NT) in the first trimester is a screening red flag for hydrops. * **Alpha-Thalassemia (Hb Bart’s):** A very common cause of hydrops in Southeast Asian populations.

Q: An infant presents with respiratory distress. What is the diagnosis based on the provided X-ray?

Diaphragmatic hernia. ***Diaphragmatic hernia*** - Classic X-ray findings include **bowel loops** visible in the thoracic cavity with **mediastinal shift** away from the affected side. - Presents with **severe respiratory distress** in newborns due to lung compression and **pulmonary hypoplasia**. *Bronchiectasis* - Typically seen in **older children** with chronic respiratory infections, not in newborns. - X-ray shows **thickened bronchial walls** and **honeycomb appearance**, not bowel loops in chest. *Hyaline membrane disease* - Shows characteristic **ground-glass opacity** with **air bronchograms** throughout both lung fields. - Associated with **surfactant deficiency** in premature infants, not bowel displacement into thorax. *Pneumatocele* - Appears as **thin-walled air-filled cysts** within lung parenchyma, typically following pneumonia. - Usually develops **post-infection** in older infants, not as a congenital condition in newborns.

Q: A 12-hour-old male infant of a diabetic mother presents with seizures. Which of the following is the least likely cause?

Hypermagnesemia. **Explanation:** In an infant of a diabetic mother (IDM), seizures are a common clinical presentation, but **Hypermagnesemia** is the least likely cause. In fact, IDMs are characteristically predisposed to **Hypomagnesemia**. This occurs because maternal diabetes often leads to maternal magnesium loss through urine, resulting in maternal hypomagnesemia. This, in turn, causes secondary magnesium deficiency in the fetus. **Analysis of Options:** * **Hypoglycemia (Option A):** This is the most common metabolic complication in IDMs. Fetal hyperinsulinism (in response to maternal hyperglycemia) persists after birth, leading to a rapid drop in blood glucose, typically within the first 1–6 hours. It is a frequent cause of neonatal seizures. * **Hypocalcemia (Option B):** IDMs often experience hypocalcemia within the first 24–72 hours. This is attributed to delayed parathyroid hormone (PTH) synthesis and the aforementioned hypomagnesemia, which interferes with PTH release and action. * **Hypermagnesemia (Option C):** This is incorrect because IDMs are prone to *low* magnesium, not high. Hypermagnesemia is usually seen in neonates whose mothers received Magnesium Sulfate ($MgSO_4$) for pre-eclampsia or eclampsia, and it typically causes hypotonia and respiratory depression rather than seizures. * **Birth Asphyxia (Option D):** IDMs are often macrosomic, increasing the risk of prolonged labor, shoulder dystocia, and birth asphyxia, all of which are potent causes of early-onset neonatal seizures. **NEET-PG High-Yield Pearls for IDM:** * **Most common cardiac anomaly:** Ventricular Septal Defect (VSD). * **Most specific cardiac anomaly:** Transposition of the Great Arteries (TGA). * **Most specific malformation:** Caudal Regression Syndrome (Sacral Agenesis). * **Other complications:** Polycythemia, Hyperbilirubinemia, and Respiratory Distress Syndrome (due to insulin inhibiting surfactant production).

Q: What is the maximum urine osmolality in a preterm neonate?

500 mOsm/kg. **Explanation:** The ability of a neonate to concentrate urine is significantly limited compared to adults due to the anatomical and physiological immaturity of the kidneys. **1. Why 500 mOsm/kg is correct:** In preterm neonates, the maximum urinary concentrating capacity is approximately **500 mOsm/kg**. This limitation is due to several factors: * **Short Loops of Henle:** Preterm infants have shorter loops, reducing the efficiency of the countercurrent multiplier system. * **Low Medullary Urea Gradient:** Neonates are in an anabolic state with low protein intake/turnover, leading to lower urea levels in the renal medulla. * **Reduced Response to ADH:** The distal tubules and collecting ducts show diminished sensitivity to Antidiuretic Hormone (ADH). **2. Analysis of Incorrect Options:** * **A (200 mOsm/kg):** This is too low; even preterm kidneys can concentrate above the osmolality of plasma (~285 mOsm/kg). * **B (400 mOsm/kg):** While closer, it underestimates the peak capacity of a stable preterm infant. * **D (800 mOsm/kg):** This is the concentrating capacity of a **term neonate**. Full-term infants have more mature nephrons but still fall short of the adult capacity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Adult Max Osmolality:** 1200–1400 mOsm/kg. * **Term Neonate Max Osmolality:** ~800 mOsm/kg. * **Preterm Neonate Max Osmolality:** ~500 mOsm/kg. * **Clinical Implication:** Because neonates cannot concentrate urine effectively, they are at a high risk of **hypernatremic dehydration** if fluid intake is inadequate or if they experience increased insensible water loss (e.g., under phototherapy). * **Diluting Capacity:** Interestingly, a neonate's ability to *dilute* urine (down to 30–50 mOsm/kg) is much better developed than their ability to concentrate it.

Q: A premature baby, born at 33 weeks of gestation with a birth weight of 1500 Gms has stable vitals. Which of the following is the initial feeding method of choice?

Orogastric tube feeding. **Explanation:** The primary determinant for the method of feeding in a neonate is the **gestational age**, which dictates the coordination of sucking, swallowing, and breathing. **1. Why Orogastric (OG) Tube Feeding is Correct:** Coordination of **sucking and swallowing** typically develops between **32 to 34 weeks** of gestation. This baby is born at 33 weeks and is hemodynamically stable. While the baby may have some sucking ability, it is often not mature enough to sustain total caloric requirements via oral feeds without the risk of aspiration or exhaustion. Therefore, **Enteral feeding via an Orogastric tube** is the initial method of choice to ensure adequate nutrition while the baby matures. Orogastric is preferred over nasogastric in neonates because they are obligatory nose breathers. **2. Why Other Options are Incorrect:** * **A & B (IV Fluids):** Intravenous fluids are indicated for babies <30 weeks, those with a birth weight <1200g, or those who are hemodynamically unstable (e.g., respiratory distress). This baby is 1500g and stable; starting enteral feeds early is preferred to promote gut maturation. * **D (Total Parenteral Nutrition):** TPN is reserved for extremely premature infants (<28-30 weeks) or those with surgical gastrointestinal contraindications where enteral feeding is not possible for a prolonged period. **Clinical Pearls for NEET-PG:** * ** 34 weeks:** Direct Breastfeeding (Suck-swallow-breath coordination is fully mature). * **Birth Weight <1500g (VLBW):** These infants are at high risk for NEC; hence, breast milk (EBM) is the gold standard for enteral feeds.

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).

Question 1

Hydrops fetalis may be caused by the following except?

Accepted Answer

Congenital varicella syndrome

Answer

Congenital heart block

Answer

Cystic hygroma

Answer

Congenital nephrosis

Question 2

An infant presents with respiratory distress. What is the diagnosis based on the provided X-ray?

Accepted Answer

Diaphragmatic hernia

Answer

Bronchiectasis

Answer

Hyaline membrane disease

Answer

Pneumatocele

Question 3

A 12-hour-old male infant of a diabetic mother presents with seizures. Which of the following is the least likely cause?

Accepted Answer

Hypermagnesemia

Answer

Hypoglycemia

Answer

Hypocalcemia

Answer

Birth asphyxia

Question 4

What is the maximum urine osmolality in a preterm neonate?

Accepted Answer

500 mOsm/kg

Answer

200 mOsm/kg

Answer

400 mOsm/kg

Answer

800 mOsm/kg

Question 5

A premature baby, born at 33 weeks of gestation with a birth weight of 1500 Gms has stable vitals. Which of the following is the initial feeding method of choice?

Accepted Answer

Orogastric tube feeding

Answer

Intravenous Fluids

Answer

Intravenous Fluids and oral feeding

Answer

Total parenteral Nutrition

Question 6

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 7

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 8

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 9

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 10

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

Neonatology — MCQs

Neonatology — MCQs

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