Neonatology Practice Questions

Q: Physiological jaundice in a term baby typically lasts up to how many days?

10 days. **Explanation:** Physiological jaundice is a common, non-pathological condition in neonates caused by the transient inability of the liver to conjugate bilirubin, combined with increased red blood cell turnover. In a **term baby**, serum bilirubin levels typically peak between days 3 and 5 and return to normal levels (less than 2 mg/dL) by **10 days of life**. In contrast, in preterm babies, the peak occurs later (days 5–7) and the jaundice can persist for up to 14 days. **Analysis of Options:** * **A (4 days):** This is usually the timeframe for the *peak* intensity of jaundice in term infants, not the resolution. * **B (7 days):** While many babies show significant decline by one week, the formal definition of the physiological window for term infants extends to 10 days. * **C (10 days):** **Correct.** This marks the upper limit for the resolution of physiological jaundice in term neonates. * **D (14 days):** This is the typical duration for physiological jaundice in **preterm** babies. In term babies, jaundice persisting beyond 14 days is termed "prolonged jaundice" and requires investigation for pathological causes (e.g., biliary atresia or hypothyroidism). **High-Yield Clinical Pearls for NEET-PG:** * **Onset:** Physiological jaundice never appears in the first 24 hours of life (always pathological if it does). * **Bilirubin Type:** It is always **unconjugated** hyperbilirubinemia. * **Rate of Rise:** The serum bilirubin level increases by less than 5 mg/dL per day. * **Peak Levels:** Usually does not exceed 15 mg/dL in term infants. * **Treatment:** Physiological jaundice typically requires no treatment other than frequent breastfeeding.

Q: A diabetic female at 40 weeks of gestation delivered a baby by elective cesarean section. Soon after birth, the baby developed respiratory distress. What is the most likely diagnosis?

Transient tachypnea of the newborn. **Explanation:** The most likely diagnosis is **Transient Tachypnea of the Newborn (TTN)**. **Why Option A is correct:** TTN, also known as "Wet Lung," is caused by delayed clearance of fetal lung fluid. The two most significant risk factors present in this clinical vignette are **Elective Cesarean Section** (missing the "thoracic squeeze" of vaginal delivery and the catecholamine surge that triggers fluid resorption) and **Maternal Diabetes**. The respiratory distress typically appears within hours of birth and is characterized by tachypnea, grunting, and retractions. **Why other options are incorrect:** * **B. Congenital Diaphragmatic Hernia:** Usually presents with a scaphoid abdomen and severe respiratory distress immediately at birth. Breath sounds are typically absent on the affected side (usually left). * **C. Tracheoesophageal Fistula:** Presents with excessive salivation, drooling, and choking/cyanosis during the first feed, rather than isolated respiratory distress immediately after a C-section. * **D. Hyaline Membrane Disease (RDS):** While maternal diabetes is a risk factor (insulin antagonizes cortisol's effect on surfactant), RDS is primarily a disease of **preterm** infants. This baby is at 40 weeks (term), making TTN much more statistically likely. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray finding in TTN:** Characterized by "Sunburst appearance," prominent vascular markings, fluid in the interlobar fissures, and occasionally pleural effusion. * **Management:** Usually self-limiting; resolves within 24–72 hours with supportive care (oxygen/CPAP). * **Key Differentiator:** If the question mentions a **term/near-term** baby and **C-section**, always think of **TTN** first. If it mentions **preterm**, think of **RDS**.

Q: Higher incidence of which of the following is seen in the infant of a diabetic mother?

Polycythemia. **Explanation:** The infant of a diabetic mother (IDM) faces several metabolic and hematologic challenges due to maternal hyperglycemia. **Why Polycythemia is correct:** Maternal hyperglycemia leads to fetal hyperglycemia, which stimulates the fetal pancreas to produce excess insulin (fetal hyperinsulinism). Insulin is a potent anabolic hormone that increases the fetal metabolic rate and oxygen consumption. This results in relative **fetal hypoxia**, which triggers the release of **erythropoietin**, stimulating the bone marrow to produce more red blood cells. This leads to **polycythemia** (hematocrit >65%), which can further cause hyperviscosity and neonatal jaundice due to increased RBC breakdown. **Why the other options are incorrect:** * **A. Macrocytic anemia:** IDMs are more prone to polycythemia, not anemia. If anemia occurs, it is usually normocytic; macrocytic anemia is typically associated with B12 or folate deficiency. * **B. Hypercalcemia:** IDMs characteristically develop **hypocalcemia** (not hypercalcemia), often due to functional hypoparathyroidism resulting from maternal-fetal magnesium imbalances. * **C. Hyperglycemia:** IDMs suffer from **hypoglycemia**. After birth, the high insulin levels persist, but the continuous glucose supply from the mother is severed, leading to a rapid drop in blood glucose within the first 1–2 hours of life. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cardiac anomaly:** Ventricular Septal Defect (VSD). * **Most specific cardiac anomaly:** Transposition of the Great Arteries (TGA). * **Most specific malformation:** Caudal Regression Syndrome (Sacral Agenesis). * **Metabolic Profile:** Hypoglycemia, Hypocalcemia, Hypomagnesemia, and Hyperbilirubinemia. * **Respiratory:** Increased risk of Respiratory Distress Syndrome (RDS) because insulin inhibits surfactant production by antagonizing cortisol.

Q: The neonatal period extends up to which point in a newborn's life?

28 days of life. **Explanation:** The **neonatal period** is defined as the first **28 days of life**. This period represents a critical transition from intrauterine to extrauterine life, characterized by significant physiological adaptations in the respiratory, circulatory, and metabolic systems. * **Why Option C is correct:** According to the World Health Organization (WHO) and standard pediatric textbooks (like Nelson and Ghai), the neonatal period starts at birth and ends at exactly 28 completed days. This is further subdivided into: * **Early Neonatal Period:** Birth to 7 completed days (0–6 days). * **Late Neonatal Period:** 7 to 28 completed days (7–27 days). * **Why Options A, B, and D are incorrect:** These timeframes do not align with standard medical definitions. While "one month" is often used colloquially (Option B), the medical and statistical definition specifically adheres to the 28-day rule to standardize global health data, such as the Neonatal Mortality Rate (NMR). **High-Yield Clinical Pearls for NEET-PG:** * **Perinatal Period:** Starts at 22 completed weeks (154 days) of gestation (when birth weight is normally 500g) and ends at 7 completed days after birth. * **Infancy:** Extends from birth up to 1 year of age. * **Neonatal Mortality Rate (NMR):** Defined as the number of deaths during the first 28 days of life per 1,000 live births. In India, neonatal deaths contribute to approximately 70% of the Infant Mortality Rate (IMR), making this period the most vulnerable phase of childhood. * **Most common cause of neonatal mortality in India:** Preterm birth and low birth weight, followed by birth asphyxia and sepsis.

Q: A large for date baby may be due to which of the following conditions?

All of the above. **Explanation:** A **Large for Gestational Age (LGA)** or "Large for Date" baby is defined as a neonate whose birth weight is above the **90th percentile** for that specific gestational age. This condition is primarily driven by hyperinsulinism or genetic factors that accelerate fetal growth. * **Diabetic Mother (Option B):** This is the most common clinical cause. According to the **Pedersen Hypothesis**, maternal hyperglycemia leads to fetal hyperglycemia. This stimulates the fetal pancreas to secrete excess insulin. Since fetal insulin acts as a potent **anabolic growth hormone**, it leads to macrosomia (increased fat deposition and organomegaly). * **Beckwith-Wiedemann Syndrome (Option A):** This is a classic overgrowth disorder characterized by the triad of **macrosomia, macroglossia (large tongue), and omphalocele**. It involves dysregulation of imprinted genes on chromosome 11p15.5 (like IGF-2). * **Genetic Predisposition (Option C):** Constitutional factors, such as tall/obese parents or high maternal weight gain during pregnancy, significantly contribute to increased birth weight. **Why "All of the above" is correct:** All three conditions independently contribute to increased fetal size through either metabolic (insulin) or genetic pathways. **High-Yield Clinical Pearls for NEET-PG:** * **Infant of Diabetic Mother (IDM):** These babies are "large but immature." They are at high risk for **hypoglycemia, hypocalcemia, polycythemia, and Hypertrophic Cardiomyopathy (Septal hypertrophy).** * **Beckwith-Wiedemann Syndrome:** Associated with an increased risk of embryonal tumors, most commonly **Wilms tumor** and hepatoblastoma. * **Sotos Syndrome:** Another high-yield overgrowth syndrome characterized by a "macrodolichocephalic" head and advanced bone age.

Q: Deficiency of surfactant is seen in which of the following conditions?

Hyaline membrane disease (HMD). ### Explanation **Correct Option: C. Hyaline membrane disease (HMD)** Hyaline Membrane Disease, also known as **Respiratory Distress Syndrome (RDS)**, is primarily caused by a deficiency of pulmonary surfactant. Surfactant (produced by Type II pneumocytes) reduces alveolar surface tension. In its absence, alveoli collapse at the end of expiration (atelectasis), leading to impaired gas exchange, hypoxia, and the formation of proteinaceous "hyaline membranes" within the alveoli. This condition is most common in preterm infants (born before 34 weeks) because surfactant production only peaks near term. **Analysis of Incorrect Options:** * **A. Bronchopulmonary Dysplasia (BPD):** This is a chronic lung disease that occurs as a *complication* of prolonged mechanical ventilation and oxygen therapy, often following HMD. It is characterized by alveolar hypoplasia rather than primary surfactant deficiency. * **B. Neonatal Asphyxia:** This refers to impaired gas exchange leading to progressive hypoxia and hypercapnia. While asphyxia can *inactivate* existing surfactant, the primary pathology is a lack of oxygenation/perfusion, not a deficiency in surfactant production. * **D. Anencephaly:** While infants with anencephaly may have lung hypoplasia due to lack of fetal breathing movements or hormonal triggers (like ACTH/cortisol), surfactant deficiency is not the hallmark or defining feature of this neural tube defect. **High-Yield Clinical Pearls for NEET-PG:** * **Lecithin/Sphingomyelin (L/S) Ratio:** A ratio **>2:1** in amniotic fluid indicates fetal lung maturity. * **Best Initial Test:** Chest X-ray showing a **"Ground glass appearance"** and air bronchograms. * **Management:** Antenatal steroids (Dexamethasone/Betamethasone) given to the mother significantly reduce the risk of HMD. * **Surfactant Composition:** Primarily **Dipalmitoylphosphatidylcholine (DPPC)**; the most important protein for function is **SP-B**.

Q: In which of the following conditions are steroids NOT indicated for treatment?

Intraventricular hemorrhage. **Explanation:** The correct answer is **Intraventricular Hemorrhage (IVH)**. In neonatology, steroids are not used to treat IVH; in fact, postnatal corticosteroid use (especially dexamethasone) has been associated with an increased risk of neurodevelopmental impairment and does not reduce the incidence or severity of existing germinal matrix hemorrhage. **Why the other options are incorrect:** * **Hypercalcemia:** Glucocorticoids are a recognized treatment for refractory neonatal hypercalcemia (e.g., in Williams Syndrome or Subcutaneous Fat Necrosis). They work by decreasing intestinal calcium absorption and increasing renal calcium excretion. * **Respiratory Distress:** Steroids are indicated in two specific contexts: **Antenatal** (to prevent Respiratory Distress Syndrome by accelerating surfactant production) and **Postnatal** (to treat or prevent Bronchopulmonary Dysplasia/Chronic Lung Disease in ventilator-dependent infants). * **Enterocolitis:** While not a primary treatment for Necrotizing Enterocolitis (NEC), steroids are used in the management of **Eosinophilic Enterocolitis**, a rare allergic gastrointestinal disorder in infants that presents with vomiting and bloody stools. **High-Yield Clinical Pearls for NEET-PG:** * **Antenatal Steroids:** The "Gold Standard" for preventing RDS, IVH, and NEC when given to the mother 24–48 hours before preterm delivery (Betamethasone is preferred over Dexamethasone). * **Postnatal Steroids:** Used cautiously for BPD (DART protocol). Side effects include hyperglycemia, hypertension, and intestinal perforation (especially when used with Indomethacin). * **IVH Prevention:** The most effective prevention for IVH is the administration of **Antenatal Corticosteroids** to the mother, not postnatal administration to the neonate.

Question 1

An infant weighing 1600 g is born at 32 weeks' gestation. Initial evaluation was benign, and the infant was transferred to the level 2 nursery for prematurity. At 1 hour of life, the infant is tachypneic with a heart rate of 140 beats per minute, a respiratory rate of 80 breaths per minute, a temperature of 35°C, and a peripheral oxygen saturation of 98%. The lungs are clear with bilateral breath sounds and there is no murmur; the infant is in no distress. The child's chest radiograph is shown. Which of the following is the most appropriate next step in evaluating the infant?

Accepted Answer

Place the infant under a warmer.

Answer

Obtain a complete blood count and differential.

Answer

Perform a lumbar puncture.

Answer

Administer intravenously 5 cc of D50W.

Question 2

Physiological jaundice in a term baby typically lasts up to how many days?

Accepted Answer

10 days

Answer

4 days

Answer

7 days

Answer

14 days

Question 3

A diabetic female at 40 weeks of gestation delivered a baby by elective cesarean section. Soon after birth, the baby developed respiratory distress. What is the most likely diagnosis?

Accepted Answer

Transient tachypnea of the newborn

Answer

Congenital diaphragmatic hernia

Answer

Tracheoesophageal fistula

Answer

Hyaline membrane disease

Question 4

Higher incidence of which of the following is seen in the infant of a diabetic mother?

Accepted Answer

Polycythemia

Answer

Macrocytic anaemia

Answer

Hypercalcaemia

Answer

Hyperglycemia

Question 5

The neonatal period extends up to which point in a newborn's life?

Accepted Answer

28 days of life

Answer

21 days of life

Answer

30 days of life

Answer

35 days of life

Question 6

What is the management of a newborn when the mother has active Tuberculosis and is taking Anti-Tuberculosis Treatment (ATT)?

Accepted Answer

BCG vaccination, Isoniazid (INH) for 6 weeks, and Breast Feeding

Answer

BCG vaccination, Rifampicin, Isoniazid (INH), and Breast Feeding

Answer

BCG vaccination and Isolation of the baby

Answer

BCG vaccination, Isoniazid (INH), and withholding Breast Feeding

Question 7

A large for date baby may be due to which of the following conditions?

Accepted Answer

All of the above

Answer

Beckwith-Wiedemann syndrome

Answer

Diabetic mother

Answer

Genetic predisposition

Question 8

What is the normal cardiac output of a newborn?

Accepted Answer

350 ml/kg/min

Answer

200 ml/kg/min

Answer

250 ml/kg/min

Answer

300 ml/kg/min

Question 9

Deficiency of surfactant is seen in which of the following conditions?

Accepted Answer

Hyaline membrane disease (HMD)

Answer

Bronchopulmonary dysplasia (BPD)

Answer

Neonatal asphyxia

Answer

Anencephaly

Question 10

In which of the following conditions are steroids NOT indicated for treatment?

Accepted Answer

Intraventricular hemorrhage

Answer

Hypercalcemia

Answer

Respiratory distress

Answer

Enterocolitis

Neonatology — MCQs

Neonatology — MCQs

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