Neonatology Practice Questions

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: Pharmacological closure of patent ductus arteriosus in a premature infant is by administration of ______________?

Ibuprofen. **Explanation:** The closure of the **Patent Ductus Arteriosus (PDA)** is mediated by the inhibition of **Prostaglandin E2 (PGE2)**, which is responsible for keeping the ductus open in utero. In premature infants, if the ductus fails to close spontaneously, pharmacological intervention is required. **Why Ibuprofen is correct:** Ibuprofen is a non-selective **Cyclooxygenase (COX) inhibitor**. By inhibiting the COX enzyme, it reduces the synthesis of prostaglandins, leading to the constriction and eventual closure of the ductus. While **Indomethacin** was traditionally the first-line agent, **Ibuprofen** is now often preferred because it has a similar efficacy rate but a lower risk of renal side effects and necrotizing enterocolitis (NEC). **Why other options are incorrect:** * **Aspirin:** Although it is a COX inhibitor, it is not used in neonates due to the risk of antiplatelet effects and the potential association with Reye’s syndrome. * **Estrogen:** This hormone has no role in ductal closure; it is primarily involved in reproductive development. * **Prednisolone:** Corticosteroids do not directly inhibit prostaglandin synthesis in the manner required to close a PDA. **High-Yield Clinical Pearls for NEET-PG:** * **First-line drugs:** Ibuprofen (IV/Oral), Indomethacin, and recently, **Paracetamol** (Acetaminophen) is emerging as an effective alternative with fewer side effects. * **Contraindications:** Pharmacological closure is contraindicated if there is active bleeding (IVH), significant thrombocytopenia, or necrotizing enterocolitis. * **Ductal Patency:** If a cyanotic heart disease is present (e.g., Transposition of Great Arteries), we keep the ductus *open* using **Alprostadil (PGE1 infusion)**. * **Murmur:** PDA is characterized by a **"machinery-like" continuous murmur** best heard at the left infraclavicular area.

Q: What is the minimum number of pustules required to diagnose a possible severe bacterial infection in children?

More than 10. This question is based on the **Integrated Management of Neonatal and Childhood Illness (IMNCI)** guidelines, which are high-yield for NEET-PG. ### **Explanation of the Correct Answer** According to IMNCI protocols for young infants (0–2 months), skin pustules are categorized to determine the severity of infection: * **Possible Serious Bacterial Infection (PSBI):** Diagnosed if there are **more than 10 skin pustules** or if there is a single large abscess. This indicates a systemic risk, requiring urgent referral and injectable antibiotics. * **Local Bacterial Infection:** Diagnosed if there are **10 or fewer pustules**. This is managed with oral antibiotics and local skin care at home. The threshold of **10 pustules** is used as a clinical proxy to differentiate between a localized skin infection and a potentially disseminated or severe infection in a vulnerable neonate. ### **Analysis of Incorrect Options** * **Option A (More than 5):** While 5 pustules require treatment, they fall under the category of "Local Bacterial Infection" (≤10 pustules). * **Options C & D (More than 15/20):** These numbers exceed the diagnostic threshold. While a child with 20 pustules certainly has a severe infection, the *minimum* number required to trigger the "Severe" classification is 10. ### **High-Yield Clinical Pearls for NEET-PG** * **Other signs of PSBI:** In addition to >10 pustules, PSBI is diagnosed if the infant has: convulsions, fast breathing (≥60 bpm), severe chest indrawing, nasal flaring, grunting, bulging fontanelle, or temperature instability (>37.5°C or <35.5°C). * **Umbilical Sepsis:** If redness of the umbilicus extends to the periumbilical skin (cellulitis), it is also classified as a **Serious Bacterial Infection**. * **Treatment:** For PSBI, the standard initial treatment is Inj. Ampicillin and Inj. Gentamicin.

Q: What is the definition of extreme preterm?

less than 28 weeks. **Explanation:** The classification of prematurity is based on the gestational age at birth, as defined by the **World Health Organization (WHO)**. This classification is crucial for predicting neonatal outcomes, mortality risk, and the intensity of required neonatal intensive care. * **Correct Answer: D (< 28 weeks):** Infants born before 28 completed weeks of gestation are classified as **Extremely Preterm**. These neonates are at the highest risk for complications such as Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **Analysis of Incorrect Options:** * **Option A (34–36 weeks):** These are classified as **Late Preterm**. They often appear like term babies but are "metabolic mimics" prone to hypoglycemia, hypothermia, and feeding difficulties. * **Option B (32–33 weeks):** These fall under the category of **Moderate Preterm**. * **Option C (28–31 weeks):** These are classified as **Very Preterm**. **High-Yield NEET-PG Pearls:** 1. **Term Pregnancy:** 37 to 42 weeks. 2. **Post-term:** ≥ 42 weeks. 3. **Viability:** In India, the limit of viability is generally considered **28 weeks** (or 1000g), though globally it is shifting toward 24 weeks. 4. **Birth Weight Correlation:** While preterm refers to *gestational age*, remember the weight-based categories: * **LBW:** < 2500g * **VLBW:** < 1500g * **ELBW:** < 1000g (Extreme Low Birth Weight) 5. **Surfactant:** Production begins at 24 weeks but reaches adequate levels only by 34–35 weeks.

Q: A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Intubation is successful with little or no improvement in clinical status. An emergency chest x-ray is shown. Which of the following is the most likely explanation for this infant's condition?

Diaphragmatic hernia. ***Diaphragmatic hernia*** - The classic triad of **scaphoid abdomen**, **absent breath sounds on the left**, and **bowel sounds in the chest** strongly indicates a **Bochdalek hernia** (congenital diaphragmatic hernia). - **Intubation provides minimal improvement** because the underlying issue is **pulmonary hypoplasia** from compression during fetal development, not just airway obstruction. *Pneumonia* - Would typically present with **bilateral decreased breath sounds** and **respiratory symptoms that improve with intubation** and oxygen support. - **Scaphoid abdomen** is not a feature of neonatal pneumonia, and chest x-ray would show **infiltrates** rather than bowel loops in the chest. *Congenital cystic adenomatoid malformation* - Presents with **cystic masses** in the lung parenchyma on chest imaging, not **bowel loops** in the thoracic cavity. - The **abdomen would appear normal**, not scaphoid, as abdominal contents remain in the peritoneal cavity. *Choanal atresia* - Causes **nasal breathing obstruction** and **cyanosis that improves with crying** (when mouth breathing occurs). - Does not affect **chest breath sounds** or cause **abdominal changes**, and intubation would provide significant improvement.

Q: All of the following are accepted therapeutic measures initiated in hyperammonemic states in an infant except?

Exchange transfusion to remove ammonia. **Explanation:** Hyperammonemia in neonates is a medical emergency, most commonly caused by Urea Cycle Disorders (UCDs) or Organic Acidemias. The primary goal of management is to stop ammonia production and enhance its excretion. **Why Option D is the correct answer (the "Except"):** While **Exchange Transfusion** was used historically, it is now considered **inefficient and obsolete** for treating hyperammonemia. It removes only a negligible amount of ammonia compared to modern techniques. The current "gold standard" for rapid ammonia removal in neonates is **Continuous Renal Replacement Therapy (CRRT)** or **Hemodialysis**, which are significantly more effective. **Analysis of Incorrect Options (Accepted Measures):** * **Option A & B:** Management requires stopping all protein intake to halt ammonia production. To prevent endogenous protein breakdown (catabolism), the infant must receive high caloric intake via **IV Dextrose (10-12 mg/kg/min) and Lipids**. Once ammonia levels stabilize, **Essential Amino Acids** are reintroduced early (within 24-48 hours) to support growth and prevent further catabolism. * **Option C:** These are "Ammonia Scavengers." **Sodium Benzoate and Sodium Phenylacetate** provide alternative pathways for nitrogen excretion (bypassing the urea cycle). **Arginine** is essential because it becomes a "rate-limiting" amino acid in most UCDs. **High-Yield Clinical Pearls for NEET-PG:** 1. **First-line investigation:** Arterial Ammonia levels (Normal 500 µmol/L or non-responsive to drugs). 3. **Commonest UCD:** Ornithine Transcarbamylase (OTC) deficiency (X-linked recessive). 4. **Clinical Clue:** A neonate with a "symptom-free interval" followed by poor feeding, vomiting, and encephalopathy (lethargy/seizures) without sepsis.

Q: Meconium ileus is associated with all of the following except?

Maternal hypertension. Meconium ileus is a condition where thick, inspissated meconium causes intestinal obstruction, typically at the level of the terminal ileum. While most commonly associated with **Cystic Fibrosis** (80-90% of cases), it is also linked to several metabolic and functional disorders. **Explanation of the Correct Answer:** **D. Maternal hypertension** is the correct answer because it is **not** a recognized risk factor for meconium ileus. Maternal hypertension is more frequently associated with intrauterine growth restriction (IUGR) or placental insufficiency, but it does not directly affect the viscosity of fetal meconium or intestinal motility in a way that leads to ileus. **Analysis of Incorrect Options:** * **A. Hirschsprung's disease:** Although primarily a cause of delayed meconium passage due to aganglionosis, it can present with a clinical picture similar to meconium ileus (meconium plug syndrome) due to functional obstruction. * **B. Maternal diabetes:** Infants of diabetic mothers (IDM) have an increased risk of **Small Left Colon Syndrome**, a functional obstruction related to meconium plugging, often grouped under the differential diagnosis of meconium ileus. * **C. Hypothyroidism:** Congenital hypothyroidism leads to decreased gut motility (peristalsis), which can result in delayed passage of meconium and inspissation, mimicking or causing meconium ileus. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Gastrografin enema (both diagnostic and therapeutic; the hyperosmolar solution draws water into the bowel to soften meconium). * **X-ray Finding:** "Ground glass" or "Soap bubble" appearance (Neuhauser’s sign) due to air mixing with meconium. * **Associated Finding:** Microcolon (due to disuse of the distal colon). * **Most Common Cause:** Cystic Fibrosis (always screen these neonates with a sweat chloride test).

Q: Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Usually occurs in exclusively breastfed babies. **Explanation:** Hemorrhagic Disease of the Newborn (HDN), now termed **Vitamin K Deficiency Bleeding (VKDB)**, is classified into three types based on the timing of onset: Early, Classical, and Late. **Why Option A is the "Except" (Correct Answer):** The question asks for the feature that is *not* characteristic. While Late VKDB **does** primarily occur in exclusively breastfed babies (because breast milk is a poor source of Vitamin K), the option is marked as the answer likely due to a technicality in the question's framing or a distractor. However, in standard medical literature, exclusive breastfeeding is the **primary risk factor** for Late VKDB. If this is a "single best answer" scenario where all options are technically true, the question may be flawed, but clinically, Late VKDB is defined by its association with breastfeeding and lack of prophylaxis. **Analysis of Other Options:** * **Option B:** Late VKDB typically presents between **2 to 12 weeks** (up to 6 months) of life. * **Option C:** Unlike the Classical form (which presents with GI bleed), Late VKDB has a very high incidence (**50–80%**) of **Intracranial Hemorrhage (ICH)**, leading to high morbidity and mortality. * **Option D:** A single dose of **1 mg Intramuscular (IM) Vitamin K** at birth is highly effective and provides nearly 100% protection against Late VKDB. **High-Yield Clinical Pearls for NEET-PG:** 1. **Early VKDB:** Occurs within 1.5 kg; 0.5 mg for babies <1.5 kg. Oral Vitamin K is less effective for preventing the Late form.

Question 1

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 2

Pharmacological closure of patent ductus arteriosus in a premature infant is by administration of ______________?

Accepted Answer

Ibuprofen

Answer

Aspirin

Answer

Estrogen

Answer

Prednisolone

Question 3

What is the minimum number of pustules required to diagnose a possible severe bacterial infection in children?

Accepted Answer

More than 10

Answer

More than 5

Answer

More than 15

Answer

More than 20

Question 4

What is the definition of extreme preterm?

Accepted Answer

less than 28 weeks

Answer

34-36 weeks

Answer

32-33 weeks

Answer

28-31 weeks

Question 5

A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Intubation is successful with little or no improvement in clinical status. An emergency chest x-ray is shown. Which of the following is the most likely explanation for this infant's condition?

Accepted Answer

Diaphragmatic hernia

Answer

Pneumonia

Answer

Congenital cystic adenomatoid malformation

Answer

Choanal atresia

Question 6

All of the following are accepted therapeutic measures initiated in hyperammonemic states in an infant except?

Accepted Answer

Exchange transfusion to remove ammonia

Answer

Intravenous administration of 10% dextrose with lipids (1 g/kg/24h)

Answer

Addition of a mixture of essential amino acids (0.25 g/kg/24h)

Answer

Intravenous infusion of sodium benzoate, sodium phenylacetate and arginine

Question 7

Meconium ileus is associated with all of the following except?

Accepted Answer

Maternal hypertension

Answer

Hirschsprung's disease

Answer

Maternal diabetes

Answer

Hypothyroidism

Question 8

Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Accepted Answer

Usually occurs in exclusively breastfed babies

Answer

Onset occurs at 4–12 weeks of age

Answer

Intracranial hemorrhage can occur

Answer

Intramuscular vitamin K prophylaxis at birth has a protective role

Question 9

A 6-hour-old infant delivered with difficulty by low forceps exhibits an asymmetric Moro reflex involving the right arm. The infant is cyanotic and has labored respiration. The abdomen does not bulge with inspiration, and breath sounds are decreased in the right chest. What is the most likely diagnosis?

Accepted Answer

Ipsilateral paralysis of the diaphragm

Answer

Respiratory distress syndrome

Answer

Meconium aspiration syndrome

Answer

Tracheoesophageal fistula

Question 10

A 30-week gestation, 1.2 kg infant develops respiratory distress, grunting, and chest retractions within 2 hours of birth. His respiratory rate is 70/min. What is the MOST appropriate next step in management?

Accepted Answer

Nasal CPAP

Answer

Surfactant therapy plus mechanical ventilation

Answer

Mechanical ventilation only

Answer

Warm humidified oxygen through a hood mask

Neonatology — MCQs

Neonatology — MCQs

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