Neonatology Practice Questions

Q: A neonate presents with frothy sputum in the mouth on the third day of life and coughing during feeding. What is the most likely diagnosis?

Tracheoesophageal fistula. ### Explanation **Correct Option: A. Tracheoesophageal Fistula (TEF)** The clinical presentation of **frothy secretions** (excessive salivation) and **coughing/choking during feeding** is the classic triad of Tracheoesophageal Fistula with Esophageal Atresia (EA). * **Mechanism:** In EA, the blind proximal esophageal pouch fills with saliva, which then overflows into the trachea or spills out of the mouth as frothy bubbles. When feeding is attempted, the milk has no path to the stomach, leading to immediate regurgitation and aspiration, causing coughing and cyanosis (the "3 Cs": Coughing, Choking, and Cyanosis). **Why other options are incorrect:** * **B. Choanal Atresia:** This presents with respiratory distress that **improves with crying** and worsens during feeding (as the neonate is an obligate nasal breather). It does not typically cause frothy sputum. * **C. Cleft Palate:** While it causes feeding difficulties and nasal regurgitation, it does not present with the characteristic "frothing" at the mouth seen in EA/TEF. * **D. Diaphragmatic Hernia:** Presents with a **scaphoid abdomen**, shifted heart sounds, and severe respiratory distress immediately after birth, rather than frothing and feeding-related coughing. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (85%) – Proximal Esophageal Atresia with Distal TEF. * **Initial Diagnostic Step:** Inability to pass a stiff, radio-opaque **nasogastric tube** (it coiling in the upper pouch on X-ray). * **Associated Anomalies:** Look for **VACTERL** association (Vertebral, Anal, Cardiac, TEF, Renal, and Limb defects). * **Antenatal Clue:** Maternal polyhydramnios and an absent fetal stomach bubble on ultrasound.

Q: Which of the following complications can occur as a result of passage of meconium in utero?

Obstructive emphysema. **Explanation:** The passage of meconium in utero, often triggered by fetal distress or hypoxia, can lead to **Meconium Aspiration Syndrome (MAS)**. **Why Option A is Correct:** When a neonate aspirates meconium-stained amniotic fluid, the thick, particulate matter reaches the distal airways. This results in a **"ball-valve" effect**: meconium allows air to enter during inspiration (when airways dilate) but obstructs air exit during expiration (when airways narrow). This leads to air trapping and **obstructive emphysema**. If the obstruction is complete, it leads to atelectasis; if partial, it leads to hyperinflation and potential air-leak syndromes like pneumothorax. **Why the Other Options are Incorrect:** * **B. Meconium ileus:** This is a primary intestinal obstruction caused by inspissated meconium in the terminal ileum, most commonly associated with **Cystic Fibrosis**. It is not caused by the passage of meconium into the amniotic fluid. * **C. Neonatal hepatitis:** This is a clinical syndrome of prolonged neonatal jaundice caused by various infectious, metabolic, or idiopathic factors. It has no pathophysiological link to meconium aspiration. * **D. Intrauterine growth restriction (IUGR):** While IUGR may be a *predisposing factor* for fetal distress (which leads to meconium passage), it is not a *complication* of meconium passage itself. **High-Yield Clinical Pearls for NEET-PG:** * **Chest X-ray findings in MAS:** Characteristic "patchy opacities" (atelectasis) alternating with areas of "hyperinflation" (emphysema). * **Chemical Pneumonitis:** Meconium is sterile but highly irritating, causing inflammation and surfactant inactivation. * **PPHN:** Persistent Pulmonary Hypertension of the Newborn is a severe, frequent complication of MAS. * **Management:** Routine intrapartum suctioning on the perineum is no longer recommended. Management focuses on respiratory support and surfactant therapy.

Q: A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?

Normal finding. **Explanation:** **1. Why "Normal finding" is correct:** Meconium is the first stool passed by a newborn. It is typically **dark green to black** in color, odorless, and has a sticky, tar-like consistency. It is composed of ingested amniotic fluid, mucus, lanugo, bile, and epithelial cells. * **Timing:** 99% of full-term healthy neonates pass meconium within the first **24 to 48 hours** of life. Passing black meconium at 12 hours is a perfectly physiological and healthy observation. **2. Why other options are incorrect:** * **Intestinal hemorrhage:** While blood can turn stool black (melena), in a 12-hour-old neonate, black sticky stool is the expected appearance of meconium, not a sign of pathology. * **Fibrocystic disease of pancreas (Cystic Fibrosis):** This condition is associated with **Meconium Ileus**, where the meconium is abnormally thick and sticky, leading to intestinal obstruction and a **failure/delay** in passing stool (>48 hours), rather than normal passage at 12 hours. * **Hirschsprung's disease:** This is characterized by a **delay** in passing meconium (usually >48 hours) due to the absence of ganglion cells in the distal colon. Early passage at 12 hours effectively rules this out. **Clinical Pearls for NEET-PG:** * **Delayed Meconium (>48 hrs):** Think of Hirschsprung’s disease, Meconium Ileus (Cystic Fibrosis), Anorectal malformations, or Hypothyroidism. * **Transition Stools:** By day 3–4, stool changes from black-green to greenish-brown. * **Breastfed Stools:** Usually appear by day 5; they are golden yellow, mustard-like, and non-offensive. * **Apt Test:** Used to differentiate swallowed maternal blood from neonatal gastrointestinal GI bleeding.

Q: A 32-week pregnant multigravida is diagnosed with gestational diabetes based on an abnormal glucose tolerance test. Which of the following is NOT a potential complication in the newborn?

Hyperglycemia. The correct answer is **B. Hyperglycemia**. ### **Explanation of the Correct Answer** The pathophysiology of an Infant of a Diabetic Mother (IDM) is governed by the **Pedersen Hypothesis**. Maternal hyperglycemia leads to fetal hyperglycemia because glucose crosses the placenta. In response, the fetal pancreas undergoes islet cell hyperplasia and secretes excess insulin (fetal hyperinsulinism). After birth, the high glucose supply from the mother is abruptly cut off, but the newborn’s insulin levels remain high. This results in **hypoglycemia**, not hyperglycemia. Therefore, hyperglycemia is not a complication seen in these neonates. ### **Analysis of Incorrect Options** * **A. Hyperbilirubinemia:** IDMs often have polycythemia (due to increased erythropoietin from fetal hypoxia). The breakdown of excess red blood cells leads to increased indirect bilirubin levels. * **C. Hypocalcemia:** This occurs due to a delay in the physiological rise of parathyroid hormone (PTH) after birth and is often associated with maternal-fetal magnesium imbalances. * **D. Hypomagnesemia:** Maternal diabetes often leads to maternal magnesium loss through urine, resulting in fetal magnesium deficiency. This, in turn, suppresses PTH secretion, worsening hypocalcemia. ### **NEET-PG High-Yield Pearls** * **Most common anomaly:** Hypertrophic Cardiomyopathy (specifically asymmetric septal hypertrophy). * **Most specific anomaly:** Caudal Regression Syndrome (Sacral Agenesis). * **Most common malformation:** Congenital Heart Disease (specifically VSD and Transposition of Great Arteries). * **Other complications:** Respiratory Distress Syndrome (insulin inhibits surfactant production), Polycythemia, and Renal Vein Thrombosis.

Q: Very low birth weight is defined as a weight of less than:

1500 gm. **Explanation:** Birth weight is a critical predictor of neonatal survival and morbidity. The World Health Organization (WHO) classifies neonates based on their birth weight to standardize clinical management and prognostic expectations. * **Correct Answer (B):** **Very Low Birth Weight (VLBW)** is defined as a birth weight of **less than 1500 grams**, regardless of gestational age. These infants are at a significantly higher risk for complications such as Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **Analysis of Incorrect Options:** * **Option A (1000 gm):** This defines **Extremely Low Birth Weight (ELBW)**. These neonates require intensive tertiary care and have the highest mortality rates. * **Option C (2000 gm):** While clinically significant, this is not a formal WHO classification threshold. * **Option D (2500 gm):** This defines **Low Birth Weight (LBW)**. Any infant weighing less than 2500 grams at birth falls into this category, which includes both preterm infants and those with Intrauterine Growth Restriction (IUGR). **High-Yield Clinical Pearls for NEET-PG:** 1. **Classification Summary:** * LBW: 4000 g (or > 4500 g in some guidelines), often associated with maternal diabetes. 3. **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR. 4. **Kangaroo Mother Care (KMC):** Specifically recommended for stable LBW/VLBW infants to improve outcomes.

Q: All of the following are true about physiological jaundice EXCEPT?

Persists beyond 10 days of life.. **Explanation:** Physiological jaundice is a common, benign condition in neonates resulting from the transient imbalance between bilirubin production and its clearance. **1. Why Option D is the Correct Answer (The Exception):** Physiological jaundice is characterized by its **transient nature**. In term neonates, it typically peaks on day 3–5 and **disappears by 7–10 days** of life. If jaundice persists beyond 10–14 days, it is no longer considered physiological and warrants investigation for pathological causes (e.g., cholestasis, hypothyroidism, or breast milk jaundice). **2. Analysis of Other Options:** * **Option A:** It is clinically detectable in approximately **60% of term** and 80% of preterm neonates during the first week, making this a true statement. * **Option B:** In physiological jaundice, the cord blood indirect bilirubin is typically low, usually ** 2.5 mg/dL) is a predictor of subsequent pathological hyperbilirubinemia. * **Option C:** Spontaneous resolution within the first week (for term infants) is a hallmark of physiological jaundice, requiring no specific treatment other than adequate feeding. **High-Yield NEET-PG Pearls:** * **Criteria for Pathological Jaundice:** Jaundice appearing within **24 hours** of birth, serum bilirubin rising >5 mg/dL/day, total bilirubin >15 mg/dL, or presence of conjugated hyperbilirubinemia (>2 mg/dL). * **Mechanism:** Increased RBC load (short lifespan), immature UGT1A1 enzyme activity, and increased enterohepatic circulation. * **Rule of Thumb:** Jaundice in a newborn always progresses in a **cephalo-caudal** direction (Kramer’s Rule).

Q: Unconjugated hyperbilirubinemia in neonates is seen in all of the following conditions except?

Dubin-Johnson syndrome. **Explanation:** The core of this question lies in distinguishing between **unconjugated (indirect)** and **conjugated (direct)** hyperbilirubinemia. **1. Why Dubin-Johnson Syndrome is the Correct Answer:** Dubin-Johnson syndrome is an autosomal recessive disorder caused by a mutation in the **MRP2 gene**, which leads to a defect in the transport of conjugated bilirubin from hepatocytes into the bile canaliculi. Therefore, it results in **conjugated hyperbilirubinemia**. A classic diagnostic feature is a "black liver" due to the accumulation of epinephrine metabolites. **2. Analysis of Incorrect Options (Causes of Unconjugated Hyperbilirubinemia):** * **Physiological Jaundice:** Occurs due to immature glucuronyl transferase activity and increased RBC turnover, leading to a rise in unconjugated bilirubin. * **Hypothyroidism:** Thyroid hormones are essential for the induction of the enzyme **UDP-glucuronosyltransferase (UGT)**. Deficiency slows down the conjugation process, causing prolonged unconjugated jaundice. * **Hemolytic Anemia:** Conditions like Rh incompatibility or G6PD deficiency cause excessive breakdown of RBCs, overwhelming the liver's conjugation capacity with heme-derived indirect bilirubin. **NEET-PG High-Yield Pearls:** * **Crigler-Najjar & Gilbert Syndromes:** These are the primary genetic causes of **unconjugated** hyperbilirubinemia (defect in UGT1A1 enzyme). * **Dubin-Johnson vs. Rotor Syndrome:** Both cause conjugated hyperbilirubinemia. Dubin-Johnson features a black liver and abnormal coproporphyrin I levels; Rotor syndrome does not have liver pigmentation. * **Rule of Thumb:** If the pathology is *before* or *at* the level of conjugation (hemolysis, uptake, or enzyme defect), it is unconjugated. If the pathology is *after* conjugation (excretion or obstruction), it is conjugated.

Q: Which of the following findings on Day 10 of life is considered worrisome?

Conjugated hyperbilirubinemia. **Explanation:** **1. Why Conjugated Hyperbilirubinemia is the Correct Answer:** In neonatology, **conjugated (direct) hyperbilirubinemia is always pathological**, regardless of the day of life. It is defined as a direct bilirubin level >1 mg/dL (if total bilirubin is 20% of the total bilirubin. On Day 10, this finding strongly suggests serious underlying conditions such as **Biliary Atresia** or neonatal cholestasis, requiring urgent investigation (e.g., HIDA scan, ultrasound) to prevent irreversible liver damage. **2. Analysis of Incorrect Options:** * **Doll’s Eye Reflex (Option B):** This is a **normal physiological finding** in the first few weeks of life. It disappears as cortical fixation develops (usually by 3–4 weeks). Its presence on Day 10 is expected. * **No Weight Gain (Option C):** It is normal for a neonate to lose up to 10% of their birth weight in the first week of life. Most infants only **regain their birth weight by Day 10–14**. Therefore, not having gained weight beyond the birth weight by Day 10 is not necessarily worrisome. * **Unconjugated Hyperbilirubinemia (Option D):** This is common on Day 10 and is often due to **Breast Milk Jaundice**, which typically peaks around Day 10–14. Unlike the conjugated form, it is usually benign and managed with observation or phototherapy if levels exceed the threshold. **Clinical Pearls for NEET-PG:** * **Physiological Jaundice:** Appears after 24 hours, peaks on Day 3–5, and disappears by Day 14. * **Pathological Jaundice:** Appears within 2 weeks (prolonged), or has a conjugated fraction. * **Biliary Atresia:** The most common cause of surgical jaundice in neonates; the Kasai procedure is most effective if performed before 60 days of life.

Question 1

A neonate presents with frothy sputum in the mouth on the third day of life and coughing during feeding. What is the most likely diagnosis?

Accepted Answer

Tracheoesophageal fistula

Answer

Choanal atresia

Answer

Cleft palate

Answer

Diaphragmatic hernia

Question 2

Which of the following complications can occur as a result of passage of meconium in utero?

Accepted Answer

Obstructive emphysema

Answer

Meconium ileus

Answer

Neonatal hepatitis

Answer

Intrauterine growth restriction

Question 3

A neonate passes black colored meconium after 12 hours of birth. What is the true statement regarding this observation?

Accepted Answer

Normal finding

Answer

Intestinal hemorrhage

Answer

Fibrocystic disease of pancreas

Answer

Hirschsprung's disease

Question 4

A 32-week pregnant multigravida is diagnosed with gestational diabetes based on an abnormal glucose tolerance test. Which of the following is NOT a potential complication in the newborn?

Accepted Answer

Hyperglycemia

Answer

Hyperbilirubinemia

Answer

Hypocalcemia

Answer

Hypomagnesemia

Question 5

Which of the following statements is NOT true about Necrotizing Enterocolitis (NEC)?

Accepted Answer

The distal part of the colon is the most frequently involved segment.

Answer

The greatest risk factor for NEC is prematurity.

Answer

NEC may be seen in term infants.

Answer

Aggressive formula feeding may predispose to the development of NEC.

Question 6

Very low birth weight is defined as a weight of less than:

Accepted Answer

1500 gm

Answer

1000 gm

Answer

2000 gm

Answer

2500 gm

Question 7

All of the following are true about physiological jaundice EXCEPT?

Accepted Answer

Persists beyond 10 days of life.

Answer

Occurs in approximately 60% of newborns within the first week of life.

Answer

Cord indirect bilirubin levels are typically below 1.3 mg/dL.

Answer

Resolves spontaneously within one week.

Question 8

Unconjugated hyperbilirubinemia in neonates is seen in all of the following conditions except?

Accepted Answer

Dubin-Johnson syndrome

Answer

Physiological jaundice

Answer

Hypothyroidism

Answer

Hemolytic anemia

Question 9

Which of the following findings on Day 10 of life is considered worrisome?

Accepted Answer

Conjugated hyperbilirubinemia

Answer

Doll's Eye Reflex

Answer

No weight gain

Answer

Unconjugated hyperbilirubinemia

Question 10

Delayed cord clamping in preterm neonates has the following effects, except:

Accepted Answer

Higher rate of necrotizing enterocolitis

Answer

Higher red cell volume

Answer

Lower rate of intraventricular hemorrhage

Answer

Lower need for blood transfusion

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?