Neonatology Practice Questions

Q: A 26-year-old primigravida develops gestational diabetes and remains hyperglycemic during the remainder of her pregnancy. Which of the following abnormalities in the newborn child is likely related to the maternal hyperglycemia?

Increased birth weight. **Explanation:** The correct answer is **C. Increased birth weight (Macrosomia).** **Pathophysiology:** The underlying mechanism is explained by the **Pedersen Hypothesis**. Maternal hyperglycemia leads to fetal hyperglycemia because glucose crosses the placenta via facilitated diffusion. In response, the fetal pancreas undergoes islet cell hyperplasia and secretes excess insulin (fetal hyperinsulinemia). Since insulin is a potent anabolic hormone and a structural analogue of Insulin-like Growth Factor (IGF-1), it promotes excessive deposition of fat and glycogen in fetal tissues, leading to **macrosomia** (birth weight >4000g or >90th percentile). **Analysis of Incorrect Options:** * **A. Ambiguous genitalia:** This is typically caused by Congenital Adrenal Hyperplasia (CAH) or chromosomal abnormalities, not maternal glucose levels. * **B. Cretinism:** This results from untreated congenital hypothyroidism (iodine deficiency or thyroid dysgenesis), not maternal diabetes. * **D. Sheehan syndrome:** This is a maternal complication involving postpartum pituitary necrosis due to severe obstetric hemorrhage; it does not occur in the newborn. **NEET-PG High-Yield Pearls:** * **Most common cardiac anomaly** in infants of diabetic mothers (IDM): Hypertrophic Cardiomyopathy (specifically asymmetric septal hypertrophy). * **Most specific anomaly:** Caudal Regression Syndrome (Sacral agenesis). * **Metabolic complications in IDM:** Hypoglycemia (due to persistent hyperinsulinemia after cord clamping), Hypocalcemia, Hypomagnesemia, and Polycythemia. * **Respiratory:** Increased risk of Respiratory Distress Syndrome (RDS) because hyperinsulinemia inhibits surfactant production by type II pneumocytes.

Q: A 32-week, 1400 g neonate is born to a primigravida. The baby did not require resuscitation and showed stable vitals. The baby was transferred to the NICU. How will you manage the feeding of this patient?

Start total enteral feeding; IV feeding is not required.. ### Explanation The management of feeding in a preterm neonate depends on the **gestational age, birth weight, and clinical stability**. **1. Why Option A is Correct:** According to standard neonatology protocols (including AIIMS and NNF guidelines), stable neonates born at **≥32 weeks** of gestation with a birth weight of **≥1200–1500 g** can usually tolerate **total enteral nutrition** from the first day of life. Since this neonate is 32 weeks, weighs 1400 g, and is hemodynamically stable (no resuscitation required, stable vitals), there is no contraindication to starting full enteral feeds (preferably via orogastric tube or paladai/spoon). Intravenous (IV) fluids are generally not required if the baby can meet their fluid and caloric requirements enterally. **2. Why Other Options are Incorrect:** * **Options B, C, and D:** These options suggest starting IV or parenteral feeding. IV fluids/Parenteral nutrition are typically reserved for babies **<32 weeks**, those weighing **<1200–1500 g**, or those who are **clinically unstable** (e.g., respiratory distress, sepsis, or birth asphyxia). Delaying enteral feeding (as suggested in C and D) unnecessarily increases the risk of catheter-related infections and delays gut maturation. **3. Clinical Pearls for NEET-PG:** * **Trophic Feeding (Minimal Enteral Nutrition):** Starting small volumes (10–15 ml/kg/day) of milk to "prime" the gut without expecting nutritional weight gain. Indicated in very low birth weight (VLBW) infants who are not yet ready for full feeds. * **Feeding Methods by Gestation:** * ** 34 weeks:** Direct breastfeeding. * **Choice of Milk:** Expressed Breast Milk (EBM) is the gold standard to prevent Necrotizing Enterocolitis (NEC).

Q: Stroke bite lesions are seen in which of the following conditions?

Macular staining of infant. **Explanation:** **Macular staining of the infant** (Option C), also known as **Nevus Simplex**, is the most common vascular lesion in neonates. These are capillary malformations characterized by pale pink, maculopapular lesions. They are colloquially named based on their location: * **"Stork bite":** When located on the nape of the neck. * **"Angel kiss":** When located on the eyelids or glabella. These lesions are benign, blanch on pressure, and typically fade within the first year of life (except for nuchal lesions, which may persist). **Why other options are incorrect:** * **Sturge-Weber Syndrome (A):** Associated with a **Port-wine stain** (Nevus Flammeus). Unlike stork bites, these are usually unilateral, follow the trigeminal nerve distribution, do not cross the midline, and do not fade with age. * **Blue Rubber Bleb Nevus Syndrome (B):** A rare condition characterized by multiple cutaneous and gastrointestinal venous malformations (hemangiomas) that appear as bluish, rubbery blebs. * **Craniofacial Nevus (D):** A general term often used to describe larger melanocytic nevi or port-wine stains, but it is not the specific clinical term for the transient macular stains seen in newborns. **High-Yield Clinical Pearls for NEET-PG:** * **Nevus Simplex (Stork bite):** Most common; transient; fades spontaneously. * **Nevus Flammeus (Port-wine stain):** Permanent; grows with the child; associated with Sturge-Weber syndrome (glaucoma, seizures, tram-track calcifications). * **Salmon Patch:** Another synonym for Nevus Simplex. * **Management:** Reassurance is the key, as no treatment is required for stork bites.

Q: Unconjugated hyperbilirubinemia is seen in all except?

Biliary atresia. **Explanation:** The core concept in this question is differentiating between **unconjugated (indirect)** and **conjugated (direct)** hyperbilirubinemia. **Why Biliary Atresia is the correct answer:** Biliary atresia is a structural condition characterized by the progressive destruction or absence of the extrahepatic biliary tree. This leads to an obstruction in bile flow, causing **conjugated hyperbilirubinemia** (cholestasis). In this condition, the liver can conjugate bilirubin, but it cannot excrete it into the intestine. Clinically, this presents with jaundice, acholic (clay-colored) stools, and dark urine. **Analysis of Incorrect Options (Causes of Unconjugated Hyperbilirubinemia):** * **Physiological Jaundice:** Caused by increased RBC breakdown and immature hepatic UGT enzyme activity. It is always unconjugated. * **Breast Milk Jaundice:** Occurs due to factors in breast milk (like beta-glucuronidase) that increase enterohepatic circulation of bilirubin. It is unconjugated. * **Gilbert Syndrome:** A genetic defect causing reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, leading to impaired conjugation and mild unconjugated hyperbilirubinemia. **NEET-PG High-Yield Pearls:** 1. **Rule of Thumb:** Any jaundice appearing within the first 24 hours of life or lasting beyond 2 weeks (prolonged jaundice) requires investigation for pathological causes. 2. **Biliary Atresia Diagnosis:** The "Gold Standard" for diagnosis is an **Intraoperative Cholangiogram (IOC)**. The initial screening test is often a HIDA scan (showing no excretion into the bowel). 3. **Treatment:** The surgical procedure of choice for Biliary Atresia is **Kasai Portoenterostomy**, ideally performed before 60 days of life for the best prognosis. 4. **Crigler-Najjar Syndrome:** Another high-yield cause of severe unconjugated hyperbilirubinemia due to total (Type I) or partial (Type II) absence of UGT enzyme.

Q: At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?

Hyperglycemia. **Explanation:** The correct answer is **C. Hyperglycemia**. In fact, growth-restricted fetuses (Fetal Growth Restriction - FGR/IUGR) are prone to **Hypoglycemia**, not hyperglycemia. **Why Hyperglycemia is incorrect (The Medical Concept):** Growth-restricted fetuses have chronic placental insufficiency, leading to poor nutrient transfer. Consequently, they have **depleted glycogen stores** in the liver and heart, and diminished subcutaneous fat (reduced glycerol for gluconeogenesis). Post-delivery, they cannot maintain blood glucose levels, making hypoglycemia a hallmark neonatal complication. **Analysis of other options:** * **Meconium Aspiration (A):** Chronic hypoxia in utero triggers vagal stimulation, leading to the passage of meconium. Combined with reduced amniotic fluid (oligohydramnios), the risk of thick meconium aspiration syndrome (MAS) is high. * **Hypothermia (B):** These neonates have a high surface-area-to-body-mass ratio and lack **brown fat** and subcutaneous adipose tissue, which are essential for non-shivering thermogenesis. * **Polycythemia (D):** Chronic intrauterine hypoxia stimulates fetal **erythropoietin** production, leading to an increased red cell mass (polycythemia) to compensate for low oxygen levels. This can result in hyperviscosity syndrome. **NEET-PG High-Yield Pearls:** * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Commonest cause of Asymmetrical IUGR:** Placental insufficiency (e.g., Preeclampsia). * **Other complications:** Hypocalcemia (due to relative hypoparathyroidism) and Pulmonary Hemorrhage. * **Rule of thumb:** IUGR babies are "Small but Mature," meaning they often have accelerated lung maturity due to chronic stress (increased steroids), reducing the risk of RDS compared to preterm infants of the same weight.

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. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. Which of the following is the most likely explanation for this infant's condition?

Diaphragmatic hernia. ### Explanation **Correct Answer: C. Diaphragmatic hernia** The clinical presentation is classic for **Congenital Diaphragmatic Hernia (CDH)**, most commonly the **Bochdalek type** (posterolateral), which occurs on the **left side** in 85% of cases. The underlying pathophysiology involves a defect in the pleuroperitoneal membrane, allowing abdominal viscera (stomach, intestines) to herniate into the thoracic cavity. This leads to: 1. **Scaphoid Abdomen:** Since the abdominal contents are in the chest, the abdomen appears sunken. 2. **Respiratory Distress:** Caused by severe **pulmonary hypoplasia** and pulmonary hypertension. 3. **Physical Findings:** Absent breath sounds on the affected side and shifted heart sounds to the contralateral side (mediastinal shift). **Why Incorrect Options are Wrong:** * **Pneumonia (A):** While it causes respiratory distress, it does not present with a scaphoid abdomen or immediate severe distress at birth. * **Congenital Cystic Adenomatoid Malformation (CCAM) (B):** This is a lung parenchymal abnormality. While it shows cystic areas on X-ray similar to bowel loops, the abdomen would be **normal/protuberant**, not scaphoid. * **Choanal Atresia (D):** This causes upper airway obstruction. Distress is relieved by crying and worsens during feeding; it does not cause unilateral absent breath sounds or a scaphoid abdomen. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and Cyanosis. * **Management Priority:** **Stabilization first.** Immediate endotracheal intubation is required. **Avoid bag-and-mask ventilation**, as it distends the herniated bowel, further compressing the lungs. * **X-ray Finding:** Presence of air-filled bowel loops in the hemithorax and a mediastinal shift. * **Most common site:** Left posterolateral (Bochdalek). Foramen of Morgagni is anterior and less common.

Q: What is the most common cause of low birth weight babies?

Prematurity. **Explanation:** Low Birth Weight (LBW) is defined by the WHO as a birth weight of less than **2,500 grams**, regardless of gestational age. Globally and in India, the two primary determinants of LBW are **Prematurity** (born before 37 weeks) and **Intrauterine Growth Restriction (IUGR)**. **Why Prematurity is the Correct Answer:** Prematurity is the leading cause of LBW. Since the majority of fetal weight gain occurs during the third trimester (specifically after 28 weeks), any infant born before 37 weeks has insufficient time to accumulate subcutaneous fat and muscle mass, resulting in a lower birth weight. In clinical practice, most LBW babies are premature, whereas most IUGR babies are "Small for Gestational Age" (SGA). **Analysis of Incorrect Options:** * **A. Anemia:** While maternal anemia is a significant risk factor for IUGR and preterm labor, it is a *contributory* factor rather than the direct classification or most common cause. * **B. Infection:** Maternal infections (e.g., TORCH, UTIs) can trigger preterm labor or cause fetal growth restriction, but they represent a specific etiology rather than the most frequent underlying mechanism. * **D. Diabetes:** Maternal diabetes (especially Gestational Diabetes) is typically associated with **Macrosomia** (birth weight >4000g or >90th percentile) rather than low birth weight, unless complicated by severe vasculopathy. **High-Yield Clinical Pearls for NEET-PG:** * **VLBW (Very Low Birth Weight):** <1,500 grams. * **ELBW (Extremely Low Birth Weight):** <1,000 grams. * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Kangaroo Mother Care (KMC):** The most effective intervention for stable LBW babies to prevent hypothermia and promote growth.

Question 1

A 26-year-old primigravida develops gestational diabetes and remains hyperglycemic during the remainder of her pregnancy. Which of the following abnormalities in the newborn child is likely related to the maternal hyperglycemia?

Accepted Answer

Increased birth weight

Answer

Ambiguous genitalia

Answer

Cretinism

Answer

Sheehan syndrome

Question 2

During neonatal resuscitation, when should chest compressions be started, and what is the ideal ratio of chest compressions to ventilation?

Accepted Answer

Heart rate less than 60 beats/min; 3:1

Answer

Heart rate less than 60 beats/min; 30:2

Answer

Heart rate less than 100 beats/min; 2:1

Answer

Heart rate less than 100 beats/min; 15:1

Question 3

A 32-week, 1400 g neonate is born to a primigravida. The baby did not require resuscitation and showed stable vitals. The baby was transferred to the NICU. How will you manage the feeding of this patient?

Accepted Answer

Start total enteral feeding; IV feeding is not required.

Answer

Start IV feeding with minimal enteral feeding.

Answer

Start IV feeding and introduce enteral feeding on the 2nd day of life.

Answer

Start parenteral feeding and institute oral feeding on the 2nd day of life.

Question 4

Respiratory distress syndrome in the newborn is commonly associated with which of the following conditions, except?

Accepted Answer

Intrauterine growth retardation

Answer

Diabetic pregnancy

Answer

Prematurity

Answer

Following an elective cesarean section

Question 5

Stroke bite lesions are seen in which of the following conditions?

Accepted Answer

Macular staining of infant

Answer

Sturge-Weber syndrome

Answer

Blue rubber bleb nevus syndrome

Answer

Craniofacial nevus

Question 6

Unconjugated hyperbilirubinemia is seen in all except?

Accepted Answer

Biliary atresia

Answer

Physiological jaundice

Answer

Breast milk jaundice

Answer

Gilbert syndrome

Question 7

At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?

Accepted Answer

Hyperglycemia

Answer

Meconium aspiration

Answer

Hypothermia

Answer

Polycythemia

Question 8

A female infant is born prematurely at 28 weeks' gestation. Shortly after birth, she shows signs of dyspnea, cyanosis, and tachypnea. She is placed on a ventilator for assisted breathing, and a diagnosis of neonatal respiratory distress syndrome (hyaline membrane disease) is made. Which of the following is the cause of this syndrome?

Accepted Answer

Lack of fetal pulmonary maturity and deficiency of surfactant

Answer

Bronchopulmonary dysplasia

Answer

Intraventricular brain hemorrhage

Answer

Necrotizing enterocolitis

Question 9

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. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. 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 10

What is the most common cause of low birth weight babies?

Accepted Answer

Prematurity

Answer

Anemia

Answer

Infection

Answer

Diabetes

Neonatology — MCQs

Neonatology — MCQs

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