Neonatology — MCQs

A mother is holding her newborn baby in the hospital bed just a few hours after giving birth. The mother becomes alarmed when her baby begins to have difficulty in breathing and she rings for help. Upon examination, the baby is in severe respiratory distress with a barrel-shaped chest, scaphoid-shaped abdomen, and absence of breath sounds on the left side. A chest radiograph reveals air/fluid containing bowel in the left-side hemithorax, no visible aerated lung on the left side, contralateral displacement of the heart and other mediastinal structures, compression of the contralateral lung, and reduced size of the abdomen. Which of the following is the most likely diagnosis?

Neonatology Indian Medical PG Practice Questions and MCQs

Question 641: Which of the following is considered a normal finding in a term neonate?

A. Erythema toxicum
B. Epstein's pearls
C. Subconjunctival hemorrhages
D. All of the above (Correct Answer)

Explanation: In neonatology, it is crucial to distinguish between physiological variations and pathological conditions. All the options listed are common, benign findings in a healthy term neonate that require no intervention. **Detailed Breakdown:** * **Erythema Toxicum Neonatorum (Option A):** This is a benign, self-limiting rash appearing in up to 50% of term newborns, usually within the first 24–48 hours. It presents as erythematous macules with central pale yellow/white papules or pustules. **High-yield fact:** A Tzanck smear of the pustule reveals **eosinophils**, distinguishing it from transient neonatal pustular melanosis (which shows neutrophils). * **Epstein’s Pearls (Option B):** These are small (1–3 mm), white-yellow epithelial cysts found on the **hard palate** near the median raphe. They are developmental remnants of trapped epithelium and typically resolve spontaneously within a few weeks. * **Subconjunctival Hemorrhages (Option C):** These are common following vaginal delivery due to the sudden increase in intrathoracic and venous pressure as the baby passes through the birth canal. They appear as bright red patches on the sclera, are asymptomatic, and resolve without treatment within 1–2 weeks. **Clinical Pearls for NEET-PG:** * **Milium:** Tiny white sebaceous cysts on the nose/cheeks (keratin-filled). * **Mongolian Spots:** Slate-gray/blue macules typically over the lumbosacral area; caused by arrested melanocyte migration. * **Molding:** Temporary alteration in head shape due to overlapping of cranial bones during labor; resolves in 2–3 days. * **Vaginal Bleeding:** "Pseudomenses" in female neonates is normal due to withdrawal of maternal estrogen.

Question 642: What is the primary cause of hyaline membrane disease?

A. Prematurity
B. Oxygen toxicity
C. Alveolar inflammation
D. Surfactant deficiency (Correct Answer)

Explanation: **Explanation:** **Hyaline Membrane Disease (HMD)**, also known as Respiratory Distress Syndrome (RDS), is primarily caused by **surfactant deficiency**. Surfactant, produced by Type II pneumocytes, reduces surface tension within the alveoli. Without adequate surfactant, surface tension increases, leading to widespread alveolar collapse (atelectasis) at the end of expiration. This results in poor gas exchange, hypoxia, and the formation of proteinaceous "hyaline membranes" within the airspaces. **Analysis of Options:** * **A. Prematurity:** While prematurity is the most significant **risk factor** for HMD (as surfactant production typically matures after 34 weeks), it is not the *pathophysiological cause*. The disease itself is a direct result of the missing biochemical substance (surfactant). * **B. Oxygen Toxicity:** This is a potential **complication** of treatment (leading to Bronchopulmonary Dysplasia or Retinopathy of Prematurity) rather than the cause of HMD. * **C. Alveolar Inflammation:** This is characteristic of pneumonia or meconium aspiration syndrome, not the primary mechanism of HMD, which is non-inflammatory atelectasis. **High-Yield Clinical Pearls for NEET-PG:** * **Lecithin/Sphingomyelin (L/S) Ratio:** A ratio **>2:1** in amniotic fluid indicates fetal lung maturity. * **X-ray Findings:** Classic "Ground glass appearance" with air bronchograms and low lung volumes. * **Prevention:** Antenatal corticosteroids (e.g., Dexamethasone or Betamethasone) given to the mother significantly reduce the risk. * **Management:** The standard of care includes **CPAP** and exogenous surfactant replacement (e.g., Poractant alfa) via the **INSURE** technique (Intubate-Surfactant-Extubate).

Question 643: A preterm neonate with hyaline membrane disease needs to be treated with:

A. Dexamethasone
B. Betamethasone
C. Hydrocortisone
D. Surfactant (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Surfactant** **Medical Concept:** Hyaline Membrane Disease (HMD), also known as Respiratory Distress Syndrome (RDS), is primarily caused by a **deficiency of pulmonary surfactant** in preterm neonates. Surfactant (produced by Type II pneumocytes) reduces alveolar surface tension, preventing alveolar collapse at the end of expiration. In its absence, the lungs become stiff (low compliance), leading to diffuse atelectasis and impaired gas exchange. Therefore, the definitive treatment for a neonate with HMD is **Exogenous Surfactant Replacement Therapy** (e.g., Poractant alfa or Beractant) administered via the endotracheal tube. **Why the other options are incorrect:** * **A & B (Dexamethasone/Betamethasone):** These are **antenatal corticosteroids**. They are administered to the *mother* (not the neonate) at risk of preterm delivery to accelerate fetal lung maturity and prevent HMD. Once the neonate is born with HMD, they are not the primary treatment. * **C (Hydrocortisone):** This is typically used in neonates for refractory hypotension or adrenal insufficiency, but it has no role in the acute management of HMD. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** The classic X-ray finding in HMD is a **"Ground Glass Appearance"** with prominent air bronchograms. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates fetal lung immaturity. * **Administration:** Surfactant is often given via the **INSURE** technique (Intubation, Surfactant, and Extubation to CPAP). * **Prevention:** A single course of antenatal Betamethasone (12 mg, 2 doses 24 hours apart) is the gold standard for prevention.

Question 644: At what age is physiological jaundice typically observed in a newborn?

A. At birth
B. Within the first week of life (Correct Answer)
C. At one month of age
D. At one year of age

Explanation: **Explanation:** Physiological jaundice is a common, non-pathological condition occurring in approximately 60% of term and 80% of preterm neonates. It occurs due to a transient imbalance between bilirubin production (high RBC turnover) and bilirubin clearance (immature hepatic glucuronosyltransferase enzyme). **Why Option B is correct:** Physiological jaundice typically appears **after 24 hours** of life, peaks between days 3–5 in term infants (days 5–7 in preterm), and usually resolves by the end of the **first week** (or 14 days in preterm). Therefore, it is characteristically observed within the first week of life. **Why other options are incorrect:** * **Option A (At birth):** Jaundice appearing at birth or within the first 24 hours is **always pathological**. Common causes include ABO/Rh incompatibility or intrauterine infections. * **Option C & D (One month/year):** Jaundice at these ages is abnormal. Prolonged jaundice (beyond 2 weeks) requires investigation for cholestasis (e.g., Biliary Atresia) or metabolic disorders. **NEET-PG High-Yield Pearls:** 1. **Kramer’s Rule:** Used for clinical assessment of jaundice progression (Cephalo-caudal progression). 2. **Pathological Jaundice Criteria:** Appears <24 hours, serum bilirubin rises >5 mg/dL/day, or total bilirubin exceeds 15 mg/dL. 3. **Treatment:** Phototherapy is the first line; it converts bilirubin into water-soluble **lumirubin** via structural isomerization. 4. **Breast Milk Jaundice:** Typically starts after the first week (day 7–10) and can last for several weeks, unlike physiological jaundice.

Question 645: An infant has an APGAR score of 6 at 5 minutes of life. What is the interpretation of this score?

A. Normal infant
B. Moderate asphyxia (Correct Answer)
C. Severe birth asphyxia
D. Requires immediate resuscitation

Explanation: **Explanation:** The APGAR score is a rapid clinical assessment tool used at 1 and 5 minutes after birth to evaluate a neonate’s transition to extrauterine life. It assesses five parameters: Heart Rate, Respiratory Effort, Muscle Tone, Reflex Irritability, and Color. **Why Option B is Correct:** The interpretation of the APGAR score is categorized as follows: * **7 to 10:** Normal/Excellent (No depression) * **4 to 6:** **Moderate Asphyxia** (Mild to moderate depression) * **0 to 3:** Severe Birth Asphyxia (Severe depression) A score of 6 at 5 minutes falls squarely into the **Moderate Asphyxia** category, indicating that the infant requires stimulation and potentially supplemental oxygen or bag-mask ventilation, but is not in a state of terminal collapse. **Why Other Options are Incorrect:** * **Option A:** A score of 7 or above is considered normal. A score of 6 indicates the infant is struggling and requires intervention. * **Option C:** Severe asphyxia is reserved for scores between 0 and 3. These infants usually require aggressive resuscitation (intubation/chest compressions). * **Option D:** While a score of 6 requires *intervention*, the term "immediate resuscitation" in neonatal protocols usually refers to the 1-minute score or infants with scores <3. Furthermore, the question asks for the **interpretation** (diagnosis/category) rather than the management step. **High-Yield Clinical Pearls for NEET-PG:** * **Most Objective Parameter:** Heart Rate. * **Least Reliable/First to disappear:** Color (Acrocyanosis is common and normal). * **Prognostic Value:** The 5-minute and 10-minute scores are better predictors of long-term neurological outcomes than the 1-minute score. * **Limitation:** APGAR score alone does **not** diagnose birth asphyxia; it must be correlated with umbilical cord blood pH and clinical signs of encephalopathy (HIE).

Question 646: Which is the commonest abdominal mass in a neonate?

A. Wilm's tumor
B. Polycystic kidney
C. Neuroblastoma (Correct Answer)
D. Rhabdomyosarcoma

Explanation: **Explanation:** In neonates, the majority (approximately 55-60%) of abdominal masses are of **renal origin**. However, when evaluating the options provided for the most common **neoplastic (malignant)** abdominal mass or a specific pathological entity in this context, **Neuroblastoma** is the correct choice. * **Neuroblastoma (Correct):** It is the most common malignant tumor of childhood and the most common abdominal malignancy in the neonatal period. It frequently presents as a firm, irregular mass that often crosses the midline. In neonates, it may present as "Blueberry muffin" spots (skin metastases) or massive hepatomegaly (Pepper syndrome). * **Wilms’ Tumor (Incorrect):** While it is the most common primary renal malignancy in children, it is **rare in the neonatal period**. The peak incidence is between 2 to 5 years of age. * **Polycystic Kidney (Incorrect):** Autosomal Recessive Polycystic Kidney Disease (ARPKD) can present with bilateral flank masses in a neonate, but it is a congenital cystic disease rather than a solid tumor. Statistically, multicystic dysplastic kidney (MCDK) is the most common *non-malignant* renal mass, but it is not listed here. * **Rhabdomyosarcoma (Incorrect):** This is a soft tissue sarcoma that can occur in the genitourinary tract, but it is significantly less common than neuroblastoma in the neonatal age group. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of neonatal abdominal mass:** Multicystic Dysplastic Kidney (MCDK) – *Non-malignant*. * **Most common neonatal malignancy:** Neuroblastoma. * **Most common renal malignancy in neonates:** Congenital Mesoblastic Nephroma (not Wilms'). * **Key distinction:** Neuroblastoma often crosses the midline and may have calcifications on X-ray/CT, whereas Wilms’ tumor usually does not cross the midline.

Question 647: The APGAR score includes which of the following parameters except?

A. Heart rate
B. Muscle tone
C. Blood pressure (Correct Answer)
D. Breathing effort

Explanation: The APGAR score is a rapid clinical assessment tool used at 1 and 5 minutes after birth to evaluate a newborn's physical condition and the need for immediate resuscitation. **Explanation of the Correct Answer:** **C. Blood Pressure** is the correct answer because it is **not** a component of the APGAR score. In a delivery room setting, measuring blood pressure is time-consuming and requires specialized equipment, making it impractical for a rapid 60-second assessment of a neonate’s transition to extrauterine life. **Explanation of Incorrect Options:** The APGAR acronym stands for: * **A - Appearance (Skin Color):** Assessing for cyanosis or pallor. * **P - Pulse (Heart Rate):** The most important prognostic indicator. (**Option A**) * **G - Grimace (Reflex Irritability):** Response to stimulation (e.g., suctioning). * **A - Activity (Muscle Tone):** Degree of flexion and movement. (**Option B**) * **R - Respiration (Breathing Effort):** Evaluated by the quality of the cry or chest excursions. (**Option D**) **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Routinely performed at **1 and 5 minutes**. If the 5-minute score is <7, it is repeated every 5 minutes up to 20 minutes. * **Scoring:** Each parameter is scored 0, 1, or 2 (Total score: 0–10). * **Interpretation:** 7–10 is normal; 4–6 is moderately depressed; 0–3 is severely depressed. * **Prognostic Value:** The APGAR score does **not** predict long-term neurological outcomes or cerebral palsy; it primarily reflects the effectiveness of resuscitation efforts. * **Sequence of Disappearance:** In neonatal distress, the parameters usually disappear in the order of: Color → Respiration → Muscle Tone → Reflex Irritability → Heart Rate.

Question 648: Meconium is excreted by a newborn till which day?

A. 2nd
B. 3rd (Correct Answer)
C. 6th
D. 4th

Explanation: **Explanation:** The transition of stool in a newborn follows a predictable chronological pattern based on the initiation of enteral feeding and the clearance of intrauterine debris. * **Correct Answer (B - 3rd Day):** Meconium is the first stool of a newborn, composed of amniotic fluid, mucus, lanugo, bile, and epithelial cells. In a healthy, term neonate, meconium is typically passed within the first 24–48 hours. By the **3rd day**, the stool begins to transition from the thick, tarry, black-green meconium to "transitional stools" (brownish-green/yellow), marking the end of pure meconium excretion. **Analysis of Incorrect Options:** * **A (2nd Day):** While most infants pass their *first* stool by day 2, the excretion of meconium continues until the gastrointestinal tract is cleared, usually extending into the 3rd day. * **D (4th Day):** By the 4th day, stools should ideally be "milk stools" (yellow and mustard-like in breastfed infants). Persistent meconium beyond the 4th day may indicate inadequate milk intake or underlying pathology. * **C (6th Day):** This is pathologically late. Prolonged meconium passage suggests intestinal obstruction or dysmotility. **High-Yield Clinical Pearls for NEET-PG:** * **Delayed Meconium (>48 hours):** Always rule out **Hirschsprung disease**, **Meconium ileus** (associated with Cystic Fibrosis), or **Anorectal malformations**. * **Meconium Plug Syndrome:** Often seen in infants of diabetic mothers or those exposed to magnesium sulfate. * **Stool Color Evolution:** Meconium (Day 1-2) → Transitional (Day 3-4) → Milk Stool (Day 5+). * **Failure to pass meconium** is the earliest clinical sign of Hirschsprung disease in 90% of cases.

Question 649: Physiological jaundice of the newborn may be managed by all of the following except?

A. Metalloporphyrin
B. Phenytoin sodium (Correct Answer)
C. Phototherapy
D. None of the above

Explanation: **Explanation:** Physiological jaundice is a common, self-limiting condition in neonates caused by the transient inability of the immature liver to conjugate bilirubin. While most cases require only observation, certain pharmacological and physical interventions can be used to manage rising bilirubin levels. **Why Phenytoin sodium is the correct answer:** Phenytoin is **not** used in the management of neonatal jaundice. In fact, phenytoin is known to be metabolized by the liver and does not induce the enzymes responsible for bilirubin conjugation in a clinically useful way for neonates. Conversely, **Phenobarbital** (not Phenytoin) is the drug used in specific cases (like Crigler-Najjar Type II) because it induces the enzyme *UDP-glucuronosyltransferase*, which enhances bilirubin conjugation. **Analysis of other options:** * **Metalloporphyrins (e.g., Tin-mesoporphyrin):** These are competitive inhibitors of the enzyme *Heme Oxygenase*. They work by blocking the rate-limiting step of heme degradation into biliverdin, thereby preventing the production of bilirubin. * **Phototherapy:** This is the gold standard and most common treatment. It uses light energy (ideally blue-green spectrum, 460-490 nm) to convert unconjugated bilirubin into water-soluble isomers (**lumirubin** and photobilirubin) that can be excreted in bile and urine without conjugation. **NEET-PG High-Yield Pearls:** * **Lumirubin:** The structural isomer formed during phototherapy; its formation is irreversible and it is the most important pathway for bilirubin excretion. * **Phenobarbital:** Takes 3–7 days to act; it is generally not used for acute physiological jaundice but may be used in chronic cholestasis or Crigler-Najjar syndrome. * **Bronze Baby Syndrome:** A complication of phototherapy occurring in infants with conjugated hyperbilirubinemia.

Question 650: A mother is holding her newborn baby in the hospital bed just a few hours after giving birth. The mother becomes alarmed when her baby begins to have difficulty in breathing and she rings for help. Upon examination, the baby is in severe respiratory distress with a barrel-shaped chest, scaphoid-shaped abdomen, and absence of breath sounds on the left side. A chest radiograph reveals air/fluid containing bowel in the left-side hemithorax, no visible aerated lung on the left side, contralateral displacement of the heart and other mediastinal structures, compression of the contralateral lung, and reduced size of the abdomen. Which of the following is the most likely diagnosis?

A. Esophageal Hiatal hernia
B. Infantile Hypertrophic Pyloric Stenosis
C. Tracheoesophageal fistula (TEF)
D. Congenital Diaphragmatic Hernia (Correct Answer)

Explanation: ### **Explanation** **Correct Answer: D. Congenital Diaphragmatic Hernia (CDH)** The clinical presentation is a classic "textbook" description of **Congenital Diaphragmatic Hernia (CDH)**. CDH occurs due to the failure of the pleuroperitoneal membranes to fuse, most commonly at the **Foramen of Bochdalek** (posterolateral, left side > right side). * **Pathophysiology:** Abdominal viscera (bowel loops, stomach, liver) herniate into the thoracic cavity during fetal development. This leads to **pulmonary hypoplasia** and pulmonary hypertension. * **Clinical Triad:** 1. **Respiratory Distress:** Occurs shortly after birth. 2. **Scaphoid Abdomen:** The abdomen appears sunken because the abdominal contents are in the chest. 3. **Barrel-shaped Chest:** Due to the presence of bowel loops in the hemithorax. * **Radiology:** Confirms the diagnosis by showing air-filled bowel loops in the chest, mediastinal shift to the contralateral side, and a lack of abdominal gas. --- ### **Why Incorrect Options are Wrong:** * **A. Esophageal Hiatal Hernia:** Usually presents with gastroesophageal reflux or vomiting later in life; it does not cause acute neonatal respiratory distress or a scaphoid abdomen. * **B. Infantile Hypertrophic Pyloric Stenosis:** Presents at **3–6 weeks** of age with non-bilious, projectile vomiting and a palpable "olive-shaped" mass. It is not a cause of neonatal respiratory distress. * **C. Tracheoesophageal Fistula (TEF):** Presents with excessive salivation, choking, and cyanosis during the first feed. While it causes respiratory issues, it does not present with a scaphoid abdomen or bowel loops in the chest. --- ### **High-Yield NEET-PG Pearls:** * **Most common site:** Left-sided posterolateral (Bochdalek hernia). * **Initial Management:** **Immediate endotracheal intubation.** Avoid bag-and-mask ventilation as it distends the herniated bowel with air, further compressing the lungs. * **Prognostic Factor:** The degree of pulmonary hypoplasia and pulmonary hypertension determines survival, not the size of the defect. * **Associated finding:** Often associated with malrotation of the gut.

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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