Neonatology Practice Questions

Q: A term infant has initial Apgar scores of 8 and 10 at 1 and 5 minutes. On auscultation of the chest, a heart murmur is audible. There is hepatosplenomegaly. Cataracts of the crystalline lens are noted. The infant is at the 30th percentile for height and weight. Echocardiography shows a patent ductus arteriosus. Which of the following events is the most likely risk factor for the findings in this infant?

Congenital rubella infection. ### Explanation The clinical presentation of **cataracts**, **Patent Ductus Arteriosus (PDA)**, and **hepatosplenomegaly** in a term infant is the classic triad of **Congenital Rubella Syndrome (CRS)**. **1. Why Option A is Correct:** CRS occurs due to maternal infection with the Rubella virus (a Togavirus) during the first trimester. The virus is teratogenic and leads to: * **Ocular defects:** "Pearly white" nuclear cataracts (most common) and glaucoma. * **Cardiac defects:** PDA (most common) and peripheral pulmonary artery stenosis. * **Auditory defects:** Sensorineural hearing loss (the most common overall finding). * **Systemic signs:** Hepatosplenomegaly, jaundice, and "Blueberry muffin" spots (extramedullary hematopoiesis). **2. Why Incorrect Options are Wrong:** * **B. Dietary folate deficiency:** Primarily associated with **Neural Tube Defects** (e.g., spina bifida, anencephaly), not cataracts or PDA. * **C. Dispermy at conception:** This leads to **Triploidy** (69 chromosomes), which usually results in spontaneous abortion or severe multi-organ anomalies and growth restriction, but does not specifically present with this classic triad. * **D. Erythroblastosis fetalis:** Caused by Rh/ABO incompatibility. It presents with severe anemia, hydrops fetalis, and hepatosplenomegaly due to hemolysis, but it does not cause congenital cataracts or structural heart defects like PDA. **3. High-Yield Clinical Pearls for NEET-PG:** * **Gregg’s Triad:** Cataracts, Deafness, and Cardiac defects (PDA). * **Timing:** The risk of malformation is highest (up to 80%) if the mother is infected within the first **12 weeks** of gestation. * **Diagnosis:** Detection of **Rubella-specific IgM** in the cord blood or infant sera. * **Prevention:** Vaccination with the **MMR vaccine** (Live attenuated). Note: MMR is contraindicated during pregnancy; women should avoid pregnancy for 1 month after vaccination.

Q: A child is born with caudal regression syndrome. What maternal complication is suspected?

Maternal diabetes. **Explanation:** **Caudal Regression Syndrome (CRS)**, also known as sacral agenesis, is a rare congenital defect characterized by the abnormal development of the lower spine (sacrum and coccyx) and associated lower limb deformities. **1. Why Maternal Diabetes is Correct:** Maternal pre-gestational diabetes mellitus is the most significant risk factor for CRS. While the most common cardiac malformation in infants of diabetic mothers (IDM) is a Ventricular Septal Defect (VSD) and the most specific cardiac finding is Asymmetric Septal Hypertrophy, **Caudal Regression Syndrome is the most specific malformation associated with maternal diabetes.** An infant born with CRS has a 200-fold higher risk of having a mother with diabetes compared to the general population. The pathogenesis is linked to fetal oxidative stress and disturbed gene expression (like *Hox* genes) during the first trimester. **2. Why Other Options are Incorrect:** * **Maternal Hypothyroidism:** Typically associated with congenital hypothyroidism (cretinism) or neurodevelopmental delays, but not structural spinal defects. * **Maternal Hypertension:** Primarily leads to Intrauterine Growth Restriction (IUGR), placental abruption, or prematurity, rather than specific teratogenic malformations. * **Maternal Cardiac Disease:** Does not have a direct causal link to caudal regression; however, maternal medications (like ACE inhibitors) can be teratogenic, but they cause renal dysgenesis rather than CRS. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common anomaly in IDM:** Cardiac anomalies (specifically VSD). * **Most specific anomaly in IDM:** Caudal Regression Syndrome. * **VACTERL association:** CRS is often a component of the VACTERL spectrum (Vertebral, Anal, Cardiac, Tracheo-Esophageal, Renal, and Limb anomalies). * **Sirenomelia:** Often confused with CRS, "Mermaid syndrome" is a more severe, distinct entity involving fused lower limbs.

Q: Which of the following features is characteristic of a premature baby compared to a baby with intrauterine growth restriction?

Sole creases all over the feet. ### Explanation The key to distinguishing a **Preterm baby** from a **Small for Gestational Age (SGA/IUGR)** baby lies in assessing physical maturity versus nutritional status. Physical maturity markers (like sole creases, ear recoil, and breast nodules) progress with gestational age, regardless of the baby's weight. **1. Why Option A is Correct:** In a **term baby with IUGR**, the gestational age is $\geq$ 37 weeks. Therefore, physical maturity markers will be well-developed. **Sole creases all over the feet** (extending to the heel) are a hallmark of a term baby. In contrast, a premature baby would have creases only on the anterior one-third or two-thirds of the sole, or none at all. **2. Analysis of Incorrect Options:** * **Option B (Breast nodule 2 mm):** This is a feature of **prematurity**. In a term IUGR baby, the breast nodule is typically $>5$ mm. * **Option C (Ear cartilage well formed):** This is a feature of **maturity (IUGR/Term)**. A preterm baby has thick, pliable ears with little cartilage and slow or no recoil. * **Option D (Skin glistening and thin):** This is characteristic of a **preterm baby**. A term IUGR baby typically has skin that is dry, cracked, leathery, or peeling (parchment-like) due to the loss of subcutaneous fat and vernix. **Clinical Pearls for NEET-PG:** * **New Ballard Score:** The standard tool used to estimate gestational age by assessing 6 neuromuscular and 6 physical criteria. * **IUGR vs. Preterm:** IUGR babies have a **higher Head Circumference to Abdominal Circumference (HC/AC) ratio** (asymmetric) and are at higher risk for hypoglycemia and polycythemia. * **Neuromuscular maturity:** Preterm babies are hypotonic ("froglike" posture), while term IUGR babies maintain good muscle tone and recoil.

Q: A newborn presents with dribbling of milk after feeds, respiratory distress, and frothing at the mouth. What is the most likely diagnosis?

Tracheoesophageal fistula. **Explanation:** The clinical triad of **excessive salivation (frothing at the mouth)**, **choking/dribbling during feeds**, and **respiratory distress** is the classic presentation of **Tracheoesophageal Fistula (TEF)**, usually associated with Esophageal Atresia (EA). 1. **Why Option A is Correct:** In the most common type (Type C: EA with distal TEF), the esophagus ends in a blind pouch. When the infant swallows saliva or milk, it cannot pass into the stomach, leading to pooling in the pouch and subsequent "frothing" and "dribbling." Respiratory distress occurs due to the aspiration of these fluids or the reflux of gastric acid through the fistula into the lungs. 2. **Why Other Options are Incorrect:** * **Tetralogy of Fallot (B):** This is a cyanotic heart disease. While it causes respiratory distress (tachypnea) and cyanosis (Tet spells), it does not present with frothing or feeding-related dribbling. * **Respiratory Distress Syndrome (C):** Primarily seen in preterm infants due to surfactant deficiency. It presents with grunting, flaring, and retractions immediately after birth, but not with excessive oral secretions or esophageal obstruction symptoms. **Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (Esophageal Atresia with Distal TEF) – ~85% of cases. * **Antenatal Clue:** Polyhydramnios (fetus cannot swallow amniotic fluid). * **Initial Diagnostic Step:** Inability to pass a stiff, radio-opaque nasogastric tube (NGT) into the stomach (coils in the pouch on X-ray). * **Associated Anomalies:** Always screen for **VACTERL** association (Vertebral, Anal, Cardiac, TEF, Renal, Limb anomalies). The most common cardiac defect is VSD.

Q: What is the most likely diagnosis for a boy born at 36 weeks gestation weighing 1800 g?

Neonatal thyrotoxicosis. **Explanation:** The correct answer is **Neonatal thyrotoxicosis**. **1. Why Neonatal Thyrotoxicosis is correct:** Neonatal thyrotoxicosis (Neonatal Graves' Disease) occurs due to the transplacental passage of maternal **Thyroid Stimulating Immunoglobulins (TSI)**. A classic clinical triad seen in these neonates is **preterm birth, low birth weight (IUGR), and microcephaly**. The hypermetabolic state induced by excess thyroid hormone leads to poor weight gain despite adequate feeding, tachycardia, irritability, and occasionally hepatosplenomegaly. In this question, a 36-weeker (preterm) weighing 1800g (Low Birth Weight/SGA) fits this clinical profile perfectly. **2. Why other options are incorrect:** * **Congenital Parvovirus B19:** Typically presents with **Hydrops Fetalis** due to severe fetal anemia and high-output cardiac failure, rather than simple low birth weight at 36 weeks. * **Fetal Alcohol Syndrome (FAS):** While it causes IUGR and microcephaly, it is characterized by distinct facial dysmorphism (smooth philtrum, thin upper lip, short palpebral fissures) which is not mentioned here. * **Nesidioblastosis:** This refers to persistent hyperinsulinemic hypoglycemia of infancy. It typically presents with **macrosomia** (large for gestational age) and severe refractory hypoglycemia, the opposite of the low birth weight seen in this case. **High-Yield Clinical Pearls for NEET-PG:** * **Pathogenesis:** It is a transient condition, resolving as maternal antibodies are cleared from the infant's circulation (usually by 3–4 months). * **Treatment:** Indicated if the infant is symptomatic. **Propranolol** is used for tachycardia; **Methimazole** or Lugol’s iodine is used to achieve euthyroidism. * **Mortality:** If untreated, mortality can be as high as 15% due to heart failure.

Q: A 30-hour-old breastfed infant develops jaundice affecting the face, palms, and soles. Which of the following is NOT a cause of this presentation?

Physiological jaundice. **Explanation:** The clinical presentation describes a 30-hour-old infant with jaundice involving the **palms and soles**. According to **Kramer’s Rule**, jaundice affecting the palms and soles indicates a serum bilirubin level >15 mg/dL, which is considered **pathological jaundice**. **Why Physiological Jaundice is the correct answer (NOT a cause):** Physiological jaundice typically appears **after 24 hours** (usually peaking between days 3–5), but it is characterized by its mild nature. It **never** involves the palms and soles, and bilirubin levels rarely exceed 12–15 mg/dL in term infants. Therefore, jaundice reaching the extremities at just 30 hours of age is inconsistent with a physiological diagnosis. **Analysis of Incorrect Options:** * **Congenital obliteration of bile duct (Biliary Atresia):** This causes conjugated hyperbilirubinemia. While it often presents slightly later, any early-onset cholestasis can lead to significant jaundice. * **Breast milk jaundice:** Though it usually peaks in the second week, early-onset "breastfeeding jaundice" (due to caloric deprivation) can cause significant unconjugated hyperbilirubinemia in the first few days. * **Septicemia:** Sepsis is a major cause of early-onset pathological jaundice. It can cause hemolysis and hepatic dysfunction, leading to high bilirubin levels that involve the entire body, including palms and soles. **NEET-PG High-Yield Pearls:** 1. **Kramer’s Staging:** Face (4-6 mg/dL), Upper trunk (6-8), Lower trunk/thighs (8-12), Arms/Lower legs (12-14), **Palms/Soles (>15 mg/dL)**. 2. **Pathological Jaundice Criteria:** Appears in 2 weeks, bilirubin increase >5 mg/dL/day, or direct bilirubin >2 mg/dL. 3. **Treatment:** Phototherapy is initiated based on age-specific nomograms (Bhutani Chart).

Q: The newborn period is defined as the first ________ days after birth?

28. **Explanation:** The **neonatal period** is defined by the World Health Organization (WHO) and standard pediatric textbooks (like Nelson) as the period from birth through the **first 28 completed days of life**. This is a critical transition phase where the infant adapts from intrauterine to extrauterine life. **Why Option B is correct:** The neonatal period is specifically divided into two phases: 1. **Early Neonatal Period:** Birth to 7 days (0–6 days). 2. **Late Neonatal Period:** 7 days to 28 days (7–27 days). The 28-day mark is the standard epidemiological cutoff used to calculate the Neonatal Mortality Rate (NMR), which is a key indicator of newborn care quality. **Why other options are incorrect:** * **Option A (21 days):** This has no clinical or statistical significance in defining the newborn period. * **Option C (30 days):** While often used colloquially to mean "one month," it is medically inaccurate. The neonatal period ends strictly at 28 days, regardless of the calendar month's length. * **Option D (40 days):** This often refers to the *puerperium* (the period following childbirth during which the mother's reproductive organs return to their non-pregnant state), not the infant’s neonatal status. **High-Yield Clinical Pearls for NEET-PG:** * **Perinatal Period:** Starts at 22 completed weeks (154 days) of gestation (when birth weight is normally 500g) and ends 7 completed days after birth. * **Infancy:** Defined as the first year of life (0–12 months). * **Neonatal Mortality Rate (NMR):** Defined as the number of deaths during the first 28 days of life per 1,000 live births. In India, NMR contributes to nearly 70% of the Infant Mortality Rate (IMR). * **Most common cause of Neonatal Mortality in India:** Prematurity and low birth weight (followed by birth asphyxia and sepsis).

Question 1

A child presented with severe respiratory distress two days after birth. On examination, he was observed to have a scaphoid abdomen and decreased breath sounds on the left side. He was managed by prompt endotracheal intubation. After ET tube placement, the maximal cardiac impulse shifted further to the right side. What should be the next step in management?

Accepted Answer

Remove tube and reattempt intubation

Answer

Confirm the position of the endotracheal tube by chest X-ray

Answer

Nasogastric tube insertion and decompress the bowel

Answer

Chest X-ray to confirm diagnosis

Question 2

A term infant has initial Apgar scores of 8 and 10 at 1 and 5 minutes. On auscultation of the chest, a heart murmur is audible. There is hepatosplenomegaly. Cataracts of the crystalline lens are noted. The infant is at the 30th percentile for height and weight. Echocardiography shows a patent ductus arteriosus. Which of the following events is the most likely risk factor for the findings in this infant?

Accepted Answer

Congenital rubella infection

Answer

Dietary folate deficiency

Answer

Dispermy at conception

Answer

Erythroblastosis fetalis

Question 3

A child is born with caudal regression syndrome. What maternal complication is suspected?

Accepted Answer

Maternal diabetes

Answer

Maternal hypothyroidism

Answer

Maternal hypertension

Answer

Maternal cardiac disease

Question 4

A neonate is suffering from respiratory distress. A chest X-ray shows multiple air-filled spaces. What is the most likely diagnosis?

Accepted Answer

Congenital lobar aplasia of the lung

Answer

Congenital lung cysts

Answer

Congenital adenomatoid malformation

Answer

Congenital diaphragmatic hernia

Question 5

Which of the following features is characteristic of a premature baby compared to a baby with intrauterine growth restriction?

Accepted Answer

Sole creases all over the feet

Answer

Breast nodule 2 mm

Answer

Ear cartilage is well formed with good elastic recoil

Answer

Skin is glistening and thin

Question 6

A newborn presents with dribbling of milk after feeds, respiratory distress, and frothing at the mouth. What is the most likely diagnosis?

Accepted Answer

Tracheoesophageal fistula

Answer

Tetralogy of Fallot

Answer

Respiratory distress syndrome

Answer

None of the above

Question 7

Which of the following supports the diagnosis of respiratory distress syndrome (RDS) in a newborn?

Accepted Answer

Air bronchogram in chest x-ray

Answer

Receipt of antenatal steroids

Answer

Manifests after 6 hours of life

Answer

Occurs after term gestation

Question 8

What is the most likely diagnosis for a boy born at 36 weeks gestation weighing 1800 g?

Accepted Answer

Neonatal thyrotoxicosis

Answer

Congenital parvovirus B19 infection

Answer

Fetal alcohol syndrome

Answer

Nesidioblastosis

Question 9

A 30-hour-old breastfed infant develops jaundice affecting the face, palms, and soles. Which of the following is NOT a cause of this presentation?

Accepted Answer

Physiological jaundice

Answer

Congenital obliteration of bile duct

Answer

Breast milk jaundice

Answer

Septicemia

Question 10

The newborn period is defined as the first ________ days after birth?

Accepted Answer

28

Answer

21

Answer

30

Answer

40

Neonatology — MCQs

Neonatology — MCQs

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