Neonatology Practice Questions

Q: All of the following cause jaundice at birth or within 24 hours EXCEPT?

Physiological jaundice. **Explanation:** Jaundice appearing **within the first 24 hours of life** is always considered **pathological**. **1. Why Physiological Jaundice is the correct answer:** Physiological jaundice occurs due to the transient inability of the immature neonatal liver to conjugate bilirubin. It typically appears **after 24 hours** of life (usually between 48–72 hours), peaks around day 4–5, and disappears by day 10–14. Since the question asks for causes *except* those appearing within 24 hours, physiological jaundice is the correct choice. **2. Analysis of Incorrect Options (Causes of Jaundice < 24 hours):** * **Hemolytic disease of the newborn:** Conditions like Rh incompatibility or ABO incompatibility cause rapid red cell destruction immediately after birth, leading to early unconjugated hyperbilirubinemia. * **Crigler-Najjar Syndrome:** This is a rare genetic deficiency of the enzyme UDP-glucuronosyltransferase (UGT1A1). Type 1 presents with severe, non-hemolytic unconjugated jaundice almost immediately after birth. * **Intrauterine infections (TORCH):** Infections like CMV, Rubella, or Toxoplasmosis cause hepatitis and biliary obstruction, leading to **conjugated hyperbilirubinemia** present at or shortly after birth. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any jaundice in the first 24 hours, bilirubin rising >5 mg/dL/day, or conjugated bilirubin >2 mg/dL is **pathological**. * **Most common cause** of jaundice in the first 24 hours: Hemolytic disease (Rh/ABO incompatibility). * **Kramer’s Rule:** Used for clinical assessment of jaundice; it progresses in a **cephalo-caudal** direction (Head to Toe). * **Biliary Atresia:** Usually presents later (2–4 weeks) with conjugated jaundice and clay-colored stools.

Q: Hypoglycemia in neonates occurs when blood glucose is less than what value?

40 mg%. **Explanation:** In neonatology, hypoglycemia is defined as a blood glucose level low enough to cause symptoms or potential neurological injury. According to the **World Health Organization (WHO)** and standard pediatric guidelines (such as Ghai Pediatrics), neonatal hypoglycemia is generally defined as a blood glucose level **<40 mg/dL** (or <45 mg/dL in some protocols) within the first 24–72 hours of life. The physiological basis for this threshold is the "nadir" that occurs 1–2 hours after birth, where glucose levels naturally drop before stabilizing. A value below 40 mg% indicates that the neonate’s metabolic demands are exceeding their glycogen stores or gluconeogenic capacity, necessitating intervention to prevent long-term neurodevelopmental sequelae. **Analysis of Options:** * **Option A (20 mg%):** This is dangerously low and represents "severe" hypoglycemia. While it was historically used as a cutoff for immediate IV intervention, it is not the diagnostic threshold. * **Option B (40 mg%):** **Correct.** This is the standard operational threshold for defining hypoglycemia in a newborn. * **Option C (60 mg%):** This is considered a normal/optimal range for an older infant or child, but it is too high to be the diagnostic cutoff for a neonate. * **Option D (10 mg%):** This represents critical, life-threatening hypoglycemia and is not a diagnostic standard. **Clinical Pearls for NEET-PG:** * **Symptomatic vs. Asymptomatic:** If blood glucose is <40 mg/dL and the baby is symptomatic (jitteriness, lethargy, seizures), immediate **IV 10% Dextrose (2 ml/kg bolus)** is required. * **High-Risk Groups:** Infants of diabetic mothers (IDM), Small for Gestational Age (SGA), and preterm babies are at the highest risk. * **Whipple’s Triad:** Remember this for general hypoglycemia: (1) Symptoms of hypoglycemia, (2) Low plasma glucose, (3) Relief of symptoms after glucose administration.

Q: Which of the following diseases can lead to opisthotonus?

Kernicterus. **Explanation:** **Kernicterus** (Bilirubin-induced neurologic dysfunction) is the correct answer. It occurs when unconjugated bilirubin crosses the blood-brain barrier and deposits in the **basal ganglia** and brainstem nuclei. **Opisthotonus**—a state of severe hyperextension where the head, neck, and spinal column enter a bridge-like arching position—is a hallmark clinical sign of **Acute Bilirubin Encephalopathy (Phase 2)**. It results from extrapyramidal involvement and intense muscle spasticity. **Analysis of Incorrect Options:** * **Tetany (A):** Characterized by increased neuromuscular irritability due to hypocalcemia. Clinical features include carpopedal spasm, laryngospasm, and seizures, but not typically opisthotonus. * **Measles (C):** A viral prodrome followed by a maculopapular rash and Koplik spots. While it can cause encephalitis as a complication, opisthotonus is not a classic or defining feature. * **Pertussis (D):** Known as "whooping cough," it presents with paroxysmal cough and inspiratory whoop. Neurological symptoms (pertussis encephalopathy) are rare and usually secondary to hypoxia or hemorrhage, not primary opisthotonus. **High-Yield Clinical Pearls for NEET-PG:** * **Target Site:** The **Globus Pallidus** is the most common site of bilirubin deposition in Kernicterus. * **Clinical Triad of Chronic Kernicterus:** Choreoathetoid cerebral palsy, sensorineural hearing loss (SNHL), and upward gaze palsy. * **Differential Diagnosis for Opisthotonus:** Tetanus (neonatal and adult), Kernicterus, Meningitis, and Phenothiazine toxicity (extrapyramidal reaction). * **MRI Finding:** High-intensity signals in the globus pallidus on T2-weighted images.

Q: What is the most specific cardiovascular anomaly in an infant of a diabetic mother?

Transposition of the Great Arteries (TGA). **Explanation:** The cardiovascular system is the most common site for congenital malformations in Infants of Diabetic Mothers (IDM). Understanding the distinction between "most common" and "most specific" is crucial for NEET-PG. **1. Why TGA is the Correct Answer:** While **Ventricular Septal Defect (VSD)** is the most common cardiac defect numerically, **Transposition of the Great Arteries (TGA)** is considered the **most specific** cardiovascular anomaly associated with maternal diabetes. The relative risk of an IDM developing TGA is significantly higher compared to the general population. The underlying mechanism involves disturbed primary heart field development and abnormal neural crest cell migration due to maternal hyperglycemia during the first trimester (organogenesis). **2. Analysis of Incorrect Options:** * **A. Ventricular Septal Defect (VSD):** This is the **most common** cardiac defect in IDMs (and in the general population), but it lacks the high specificity associated with TGA in the context of diabetic embryopathy. * **C. TAPVC & D. ASD:** While these can occur in IDMs, they do not show a statistically significant or specific correlation with maternal diabetes compared to TGA or VSD. **3. NEET-PG High-Yield Pearls:** * **Most Common Cardiac Abnormality:** Asymmetric Septal Hypertrophy (Hypertrophic Cardiomyopathy). This is transient and resolves after birth as insulin levels normalize. * **Most Common Structural Defect:** VSD. * **Most Specific Structural Defect:** TGA. * **Other Specific Associations:** Truncus Arteriosus, Tricuspid Atresia, and Coarctation of the Aorta. * **Non-Cardiac Specificity:** **Caudal Regression Syndrome** (Sacral Agenesis) is the overall most specific malformation in IDMs, though it is rare.

Q: A newborn with an APGAR score of 2 at 1 minute and 6 at 5 minutes presents with respiratory distress and mediastinal shift. What is the most likely diagnosis?

All of these. **Explanation:** The correct answer is **D. All of these**. The clinical presentation of a newborn with low APGAR scores, respiratory distress, and a **mediastinal shift** indicates a space-occupying lesion or pressure imbalance within the thoracic cavity that is displacing the heart and trachea to the contralateral side. **1. Why "All of these" is correct:** * **Congenital Diaphragmatic Hernia (CDH):** This is the most classic cause. Abdominal contents herniate into the chest (usually the left side), compressing the lungs and shifting the mediastinum to the opposite side. It presents with a scaphoid abdomen and immediate respiratory distress. * **Pneumothorax:** In neonates (especially those requiring resuscitation or having meconium aspiration), air can leak into the pleural space. A tension pneumothorax creates positive pressure that pushes the mediastinum away from the affected side. * **Congenital Pulmonary Airway Malformation (CPAM/CCAM):** This is a cystic adenomatoid proliferation of lung tissue. Large cysts can cause significant mass effect, leading to lung hypoplasia and mediastinal shift. **2. Clinical Pearls for NEET-PG:** * **Immediate Management of CDH:** Avoid bag-and-mask ventilation (as it distends the bowel in the chest, worsening compression); instead, perform **immediate endotracheal intubation**. * **Diagnosis:** A chest X-ray is the gold standard for differentiating these conditions. CDH shows bowel loops in the thorax; Pneumothorax shows a hyperlucent area without lung markings; CPAM shows multi-cystic lesions. * **Mediastinal Shift:** Always look for this sign in "Respiratory Distress" questions. If the shift is *toward* the lesion, think of collapse/agenesis; if the shift is *away* from the lesion, think of CDH, pneumothorax, or cysts.

Q: What is the minimum and maximum score of the Expanded New Ballard Score?

-10 and 50. **Explanation:** The **New Ballard Score (NBS)** is a clinical tool used to estimate gestational age in neonates by assessing physical and neuromuscular maturity. The "Expanded" version was specifically designed to include extremely premature infants (born as early as 20 weeks). **1. Why the Correct Answer is D (-10 and 50):** The Expanded New Ballard Score assesses **6 Neuromuscular** and **6 Physical** criteria. Each criterion is scored on a scale from -1 to 5 (some physical criteria start at -2). * **Minimum Score:** The lowest possible score for each of the 12 categories is either -1 or -2. When totaled, the minimum cumulative score is **-10**, which corresponds to **20 weeks** of gestation. * **Maximum Score:** The highest possible score for each category is 5 (for post-mature features). The maximum cumulative score is **50**, which corresponds to **44 weeks** of gestation. **2. Analysis of Incorrect Options:** * **Option A (-15 and 40):** Incorrect range; the scale does not go as low as -15, and 40 only represents 40 weeks of gestation. * **Option B (20 and 44):** These numbers represent the gestational age range (20 to 44 weeks) that the score covers, not the numerical score itself. * **Option C (-20 and 44):** Incorrect; -20 is not a possible score, and 44 is the gestational age limit, not the maximum score. **Clinical Pearls for NEET-PG:** * **Timing:** For maximum accuracy, the assessment should be performed within **24 hours** of birth. If the infant is <26 weeks, it should be done within the first 12 hours. * **Components:** Remember the "6+6" rule (6 Neuromuscular + 6 Physical signs). * **Neuromuscular signs include:** Posture, Square window, Arm recoil, Popliteal angle, Scarf sign, and Heel to ear. * **Physical signs include:** Skin, Lanugo, Plantar surface, Breast, Eye/Ear, and Genitals.

Q: A term neonate, delivered by C-section, presents with respiratory distress immediately after birth. X-ray shows perihilar streaking, and the distress subsides after 48-72 hours. What is the diagnosis?

Transient tachypnea of the newborn. **Explanation:** **Transient Tachypnea of the Newborn (TTN)**, also known as "Wet Lung Disease," is the most likely diagnosis. The underlying pathophysiology is the **delayed clearance of fetal lung fluid** by the pulmonary lymphatic system. 1. **Why Option D is correct:** TTN characteristically occurs in **term neonates** delivered via **elective C-section** (missing the "thoracic squeeze" of vaginal delivery) or precipitous labor. The classic X-ray findings include **perihilar streaking** (prominent pulmonary vascular markings) and fluid in the interlobar fissures. Clinically, the distress is self-limiting and typically resolves within **48–72 hours** as the fluid is absorbed. 2. **Why other options are incorrect:** * **Neonatal Apnea:** Refers to a cessation of breathing for >20 seconds; it is a disorder of respiratory control, not a parenchymal lung issue presenting with tachypnea. * **Meconium Aspiration Syndrome (MAS):** Occurs in post-term infants with a history of meconium-stained liquor. X-ray shows "patchy opacities" and hyperinflation, not simple perihilar streaking. * **ARDS (or RDS/HMD):** Primarily affects **preterm** infants due to surfactant deficiency. X-ray shows a "ground-glass" appearance and air bronchograms. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Elective C-section, maternal asthma, and maternal diabetes. * **X-ray Buzzwords:** Perihilar streaking, "Sunburst" appearance, fluid in fissures, and mild cardiomegaly. * **Management:** Supportive care (oxygen via hood/CPAP). It is a diagnosis of exclusion. * **Key differentiator:** If the distress lasts >72 hours, reconsider the diagnosis (e.g., pneumonia or congenital heart disease).

Question 1

According to the perinatal risk stratification of preterm neonates and developmental outcomes, which of the following constitutes a moderate risk category?

Accepted Answer

Gestation 30-32 weeks, birth weight 1000-1500 gm, 1-3 days of hypoglycemia

Answer

Gestation < 28 weeks, birth weight 1251-1500 gm, 1-4 days of hypoglycemia

Answer

Gestation < 28 weeks, birth weight <1250 gm, 1-4 days of hypoglycemia

Answer

Gestation 30-32 weeks, birth weight 1251-1500 gm, more than 5 days of hypoglycemia

Question 2

All of the following cause jaundice at birth or within 24 hours EXCEPT?

Accepted Answer

Physiological jaundice

Answer

Hemolytic disease of the newborn

Answer

Crigler-Najjar syndrome

Answer

Intrauterine infections (TORCH)

Question 3

A male baby born at term with an uncomplicated pregnancy, labor, and delivery developed severe respiratory distress within a few hours of birth. His chest X-ray revealed a normal heart shadow and fine reticulonodular infiltrates radiating from the hilum. Echocardiogram findings revealed no abnormality, and the results of routine cultures were also negative. Family history reveals a similar clinical course and death of a male sibling at 1 month and a female sibling at 2 months of age, respectively. What is the most likely diagnosis?

Accepted Answer

Neonatal Alveolar Proteinosis

Answer

Total Anomalous Pulmonary Venous Circulation (TAPVC)

Answer

Meconium Aspiration Syndrome

Answer

Diffuse Herpes simplex infection

Question 4

Hypoglycemia in neonates occurs when blood glucose is less than what value?

Accepted Answer

40 mg%

Answer

20 mg%

Answer

60 mg%

Answer

10 mg%

Question 5

Which of the following diseases can lead to opisthotonus?

Accepted Answer

Kernicterus

Answer

Tetany

Answer

Measles

Answer

Pertussis

Question 6

What is the most specific cardiovascular anomaly in an infant of a diabetic mother?

Accepted Answer

Transposition of the Great Arteries (TGA)

Answer

Ventricular Septal Defect (VSD)

Answer

Total Anomalous Pulmonary Venous Connection (TAPVC)

Answer

Atrial Septal Defect (ASD)

Question 7

A newborn with an APGAR score of 2 at 1 minute and 6 at 5 minutes presents with respiratory distress and mediastinal shift. What is the most likely diagnosis?

Accepted Answer

All of these

Answer

Congenital adenomatoid lung disease

Answer

Pneumothorax

Answer

Diaphragmatic hernia

Question 8

A newborn has a heart rate of 80 bpm and gasping respirations. What is your next immediate step?

Accepted Answer

Positive pressure ventilation with room air.

Answer

Intubate the newborn.

Answer

Positive pressure ventilation with 50% oxygen.

Answer

Continuous positive airway pressure with 100% oxygen.

Question 9

What is the minimum and maximum score of the Expanded New Ballard Score?

Accepted Answer

-10 and 50

Answer

-15 and 40

Answer

20 and 44

Answer

-20 and 44

Question 10

A term neonate, delivered by C-section, presents with respiratory distress immediately after birth. X-ray shows perihilar streaking, and the distress subsides after 48-72 hours. What is the diagnosis?

Accepted Answer

Transient tachypnea of the newborn

Answer

Neonatal apnea

Answer

Meconium aspiration syndrome

Answer

ARDS

Neonatology — MCQs

Neonatology — MCQs

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