Neonatology Practice Questions

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: What is true about pulmonary surfactant?

All of the above. Pulmonary surfactant is a surface-active lipoprotein complex (primarily **Dipalmitoylphosphatidylcholine/Lecithin**) secreted by **Type II pneumocytes**. Its primary function is to reduce surface tension at the air-liquid interface of the alveoli, preventing alveolar collapse during expiration (increasing lung compliance). **Explanation of Options:** * **Option A:** Pulmonary surfactant is a distinct biochemical entity essential for extrauterine life. * **Option B:** Deficiency is the hallmark of **Hyaline Membrane Disease (HMD)**, also known as Respiratory Distress Syndrome (RDS). In preterm neonates (usually <34 weeks), inadequate surfactant leads to diffuse alveolar atelectasis, ventilation-perfusion mismatch, and the formation of proteinaceous hyaline membranes. * **Option C:** It has significant therapeutic applications. **Exogenous surfactant replacement therapy** (e.g., Poractant alfa, Beractant) is the standard of care for treating RDS in preterm infants, significantly reducing mortality and air leak syndromes. Since all statements are physiologically and clinically accurate, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Composition:** 90% lipids (mainly Lecithin) and 10% proteins (**SP-A, B, C, D**). **SP-B** is most critical for surfactant function. * **Maturity Marker:** An **L:S ratio > 2:1** in amniotic fluid indicates fetal lung maturity. * **Synthesis:** Begins around 24–28 weeks; reaches mature levels by **35 weeks**. * **Stimulants:** Glucocorticoids (Betamethasone/Dexamethasone) accelerate surfactant production by inducing Type II pneumocytes. * **Chest X-ray in HMD:** Characterized by a "Ground glass" appearance and air bronchograms.

Q: Which of the following is not a sign of Patent Ductus Arteriosus (PDA) in a preterm baby?

Narrow pulse pressure. **Explanation:** In a preterm neonate, a **Patent Ductus Arteriosus (PDA)** leads to a left-to-right shunt, causing pulmonary over-circulation and systemic "steal." **Why "Narrow Pulse Pressure" is the correct answer:** PDA is characterized by **Wide Pulse Pressure**, not narrow. This occurs because blood shunts from the aorta into the pulmonary artery during diastole (diastolic steal), significantly lowering the diastolic blood pressure. Simultaneously, the increased stroke volume to compensate for the shunt maintains or raises systolic pressure, resulting in a wide gap between the two. **Analysis of Incorrect Options:** * **Apnea:** PDA causes pulmonary congestion and decreased lung compliance, which frequently triggers or worsens apnea of prematurity. * **Tachycardia:** This is a compensatory mechanism. The heart rate increases to maintain systemic cardiac output in the face of the diastolic steal and left-sided volume overload. * **Necrotizing Enterocolitis (NEC):** The "ductal steal" phenomenon diverts blood away from the mesenteric circulation. This intestinal ischemia is a well-documented risk factor for the development of NEC in preterm infants. **High-Yield Clinical Pearls for NEET-PG:** * **Murmur:** Classically described as a **continuous "machinery" murmur** at the left upper sternal border. In preterms, it may only be systolic. * **Bounding Pulses:** A hallmark physical finding due to the wide pulse pressure (e.g., "water-hammer" pulses). * **Hyperactive Precordium:** Due to left ventricular volume overload. * **Management:** First-line medical management includes NSAIDs like **Indomethacin** or **Ibuprofen** (and recently, Paracetamol). If medical therapy fails or is contraindicated, surgical ligation is considered.

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: 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.

Q: A newborn presents with the following findings: heart rate of 110, slow and irregular respiratory effort, flaccid muscle tone, no reflex irritability, and blue color. What is the Apgar score in this case?

3. ### Explanation The **Apgar score** is a rapid clinical assessment tool used at 1 and 5 minutes after birth to evaluate a newborn’s transition to extrauterine life. It assesses five parameters, each scored from 0 to 2. In this clinical scenario, the score is calculated as follows: * **Heart Rate:** 110 bpm (>100 bpm) = **2 points** * **Respiratory Effort:** Slow and irregular = **1 point** * **Muscle Tone:** Flaccid/Limp = **0 points** * **Reflex Irritability:** No response = **0 points** * **Color:** Blue/Pale = **0 points** * **Total Score:** 2 + 1 + 0 + 0 + 0 = **3** #### Analysis of Incorrect Options: * **Option A (1):** This score would be too low; it ignores the fact that the heart rate is >100 (2 points) and there is some respiratory effort (1 point). * **Option C (5) & D (7):** These scores are too high. They would require better muscle tone (flexion), active reflex response (grimace/cry), or better peripheral perfusion (acrocyanosis). #### NEET-PG High-Yield Pearls: * **Mnemonic:** **A**ppearance (Color), **P**ulse (Heart Rate), **G**rimace (Reflex Irritability), **A**ctivity (Muscle Tone), **R**espiration. * **Heart Rate** is the most important prognostic component of the score. * **Interpretation:** 0–3: Severe distress; 4–6: Moderate distress; 7–10: Normal/Excellent. * **Crucial Note:** The Apgar score is **not** used to determine the need for initial resuscitation; resuscitation must begin immediately if the baby is apneic or gasping, without waiting for the 1-minute score.

Question 1

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 2

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 3

What is true about pulmonary surfactant?

Accepted Answer

All of the above

Answer

Pulmonary surfactant itself

Answer

Deficiency occurs in hyaline membrane disease

Answer

Has therapeutic applications

Question 4

Which of the following is not a sign of Patent Ductus Arteriosus (PDA) in a preterm baby?

Accepted Answer

Narrow pulse pressure

Answer

Apnea

Answer

Tachycardia

Answer

Necrotizing enterocolitis

Question 5

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 6

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 7

Which of the following is a characteristic finding in a small for gestational age infant?

Accepted Answer

Undescended testis

Answer

Wrinkled sole

Answer

Lanugo on sole

Answer

Breast nodule

Question 8

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

Question 9

A newborn presents with the following findings: heart rate of 110, slow and irregular respiratory effort, flaccid muscle tone, no reflex irritability, and blue color. What is the Apgar score in this case?

Accepted Answer

3

Answer

1

Answer

5

Answer

7

Question 10

Which of the following is true about Harlequin skin color change?

Accepted Answer

Probably reflects an imbalance in the autonomic vascular regulatory mechanism

Answer

The skin of the entire body is typically reddish

Answer

Needs immediate hospitalization

Answer

A complication of Epidermolysis bullosa

Neonatology — MCQs

Neonatology — MCQs

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