Neonatology Practice Questions

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: An infant born 3 hours previously to a mother with poorly controlled insulin-dependent gestational diabetes presents with abnormal breathing. Examination reveals cyanosis, irregular and labored breathing, decreased breath sounds on the right side, and decreased tone in the right arm. A stat portable chest radiograph is normal. Which of the following studies is most likely to confirm the diagnosis?

Chest ultrasound. **Explanation:** The clinical presentation points toward **Phrenic Nerve Palsy**, a birth injury often associated with macrosomia and difficult deliveries (common in infants of diabetic mothers). The combination of respiratory distress (cyanosis, labored breathing), unilateral decreased breath sounds, and ipsilateral **Erb’s palsy** (decreased tone in the right arm) is classic. 1. **Why Chest Ultrasound is correct:** In phrenic nerve palsy, the affected side of the diaphragm is paralyzed. While a chest X-ray may show an elevated hemidiaphragm, it can often appear normal in the early hours or if the infant is on positive pressure. **Chest Ultrasound (or fluoroscopy)** is the gold standard for confirmation as it demonstrates **paradoxical diaphragmatic movement** (the affected side moves upward during inspiration while the healthy side moves downward). 2. **Why other options are incorrect:** * **Nasal wash:** Used for bronchiolitis (RSV); however, the focal lung findings and associated arm weakness make a viral etiology unlikely. * **Fiberoptic bronchoscopy:** Used for internal airway obstructions (e.g., laryngomalacia). It cannot evaluate diaphragmatic excursion. * **Chest CT:** Provides detailed anatomy but is unnecessary, involves high radiation, and does not show the dynamic movement of the diaphragm as effectively as ultrasound. **Clinical Pearls for NEET-PG:** * **Association:** 80-90% of phrenic nerve palsies are associated with **ipsilateral Brachial Plexus injury** (C3-C5 roots). * **Management:** Most cases are managed conservatively with positioning (affected side down); surgical plication is reserved for refractory cases. * **Differential:** Always differentiate from **Congenital Diaphragmatic Hernia (CDH)**; however, CDH typically shows a scaphoid abdomen and bowel loops on X-ray.

Q: An infant presents with cleft lip, cleft palate, polydactyly, microcephaly with holoprosencephaly, and ectodermal scalp defect. Which of the following genetic conditions is the infant likely suffering from?

Trisomy 13. **Explanation:** The clinical presentation described—**cleft lip/palate, polydactyly, and holoprosencephaly**—forms the classic triad of **Patau Syndrome (Trisomy 13)** [1]. This condition results from a failure of the prosencephalon to divide (holoprosencephaly), leading to midline facial defects [1]. The presence of **cutis aplasia** (ectodermal scalp defects) is a highly specific, pathognomonic finding for Trisomy 13 in medical entrance exams. **Analysis of Options:** * **Trisomy 13 (Correct):** Characterized by "3 Ps": **P**olydactyly, **P**alate (cleft), and **P**rosencephalon defects (holoprosencephaly) [1]. Microphthalmia and rocker-bottom feet are also common. * **Trisomy 21 (Down Syndrome):** Presents with flat facial profile, upslanting palpebral fissures, Simian crease, and Sandal gap [2, 3]. It lacks the severe midline structural malformations like holoprosencephaly. * **Trisomy 18 (Edwards Syndrome):** Characterized by "PRINCE" features: **P**rominent occiput, **R**ocker-bottom feet, **I**ntellectual disability, **N**ondisjunction, **C**lenched fists (overlapping fingers), and **E**ars (low-set). While it shares rocker-bottom feet with Trisomy 13, it does not typically feature polydactyly or clefting. * **Turner Syndrome (45, XO):** Presents in females with cystic hygroma, webbing of the neck, and coarctation of the aorta. It does not involve polydactyly or holoprosencephaly. **High-Yield NEET-PG Pearls:** * **Cutis Aplasia:** If you see "punched-out scalp lesion" or "scalp defect" in a neonate, think Trisomy 13. * **Holoprosencephaly:** Associated with Sonic Hedgehog (SHH) gene mutations and Trisomy 13 [1]. * **Survival:** Most cases of Trisomy 13 and 18 result in stillbirth or death within the first year of life, unlike Trisomy 21.

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: 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.

Question 1

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 2

An infant born 3 hours previously to a mother with poorly controlled insulin-dependent gestational diabetes presents with abnormal breathing. Examination reveals cyanosis, irregular and labored breathing, decreased breath sounds on the right side, and decreased tone in the right arm. A stat portable chest radiograph is normal. Which of the following studies is most likely to confirm the diagnosis?

Accepted Answer

Chest ultrasound

Answer

Nasal wash for viral culture

Answer

Fiberoptic bronchoscopy

Answer

Chest CT

Question 3

An infant presents with cleft lip, cleft palate, polydactyly, microcephaly with holoprosencephaly, and ectodermal scalp defect. Which of the following genetic conditions is the infant likely suffering from?

Accepted Answer

Trisomy 13

Answer

Trisomy 21

Answer

Trisomy 18

Answer

Turner syndrome

Question 4

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 5

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 6

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 7

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

Accepted Answer

Ibuprofen

Answer

Aspirin

Answer

Estrogen

Answer

Prednisolone

Question 8

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 9

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 10

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

Neonatology — MCQs

Neonatology — MCQs

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