Neonatology Practice Questions

Q: One of the earliest features of neonatal sepsis is:

Alteration of established feeding behaviour. ### Explanation Neonatal sepsis is a clinical syndrome characterized by systemic signs of infection and accompanied by bacteremia in the first month of life. **Why Option A is Correct:** The earliest signs of neonatal sepsis are often **subtle, non-specific, and vague**. Neonatologists frequently refer to this as the infant **"not doing well."** An **alteration in established feeding behavior** (refusal to suck, poor feeding, or increased gastric residuals) is typically the first clinical indicator. Other early signs include lethargy, irritability, and temperature instability (hypothermia is more common than fever in preterm neonates). **Why Other Options are Incorrect:** * **B. Shock:** This is a **late and decompensated feature** of septicemia. It indicates multi-organ dysfunction and carries a high mortality rate. * **C. Bleeding:** Manifesting as petechiae, purpura, or GI bleeds, this usually indicates **Disseminated Intravascular Coagulation (DIC)**, a severe complication of advanced sepsis. * **D. Sclerema:** This refers to the hardening of subcutaneous fat. It is a **grave prognostic sign** seen in severely ill, cold, and septic neonates, indicating a near-terminal state. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Blood culture (though results take 24–48 hours). * **Hematological Scoring System (Rodwell’s):** Includes parameters like total WBC count, immature-to-total (I:T) neutrophil ratio (>0.2 is significant), and degenerative changes in neutrophils. * **Most Common Organisms:** In India, *Klebsiella pneumoniae* and *Staphylococcus aureus* are common; globally, Group B Streptococcus (GBS) is a major cause of early-onset sepsis. * **First-line Antibiotics:** Usually a combination of Ampicillin and Gentamicin (or Amikacin).

Q: Which of the following conditions is commonly encountered in a female newborn and requires no therapy?

Mucoid vaginal discharge. **Explanation:** The correct answer is **Mucoid vaginal discharge**. This is a physiological phenomenon in female neonates caused by the **passive placental transfer of maternal estrogen** during pregnancy. 1. **Why it is correct:** High levels of maternal estrogen stimulate the fetal endometrial lining and vaginal mucosa. After birth, the sudden withdrawal of these hormones leads to the shedding of the vaginal epithelium (mucoid discharge) and, in some cases, "pseudomenses" (blood-tinged discharge) [1]. This is a self-limiting, benign condition that typically resolves within the first week of life and requires only parental reassurance [1]. 2. **Why the other options are incorrect:** * **Enlarged clitoris:** This is an abnormal finding (clitoromegaly) and may be a sign of Congenital Adrenal Hyperplasia (CAH) or maternal androgen exposure [3]. It requires a thorough endocrine workup. * **Labial fusion:** While often benign, it is usually an acquired condition due to low estrogen levels or local irritation. If it causes urinary obstruction or recurrent infections, it may require topical estrogen cream or surgical intervention. * **Prolapsed urethra:** This presents as a congested, donut-shaped mass at the urinary meatus [2]. It is a rare clinical emergency that requires medical or surgical management. **High-Yield Clinical Pearls for NEET-PG:** * **Breast engorgement:** Can occur in both male and female neonates due to maternal estrogen; it may be accompanied by "Witch’s milk" secretion. Never squeeze the tissue as it can lead to mastitis. * **Pseudomenses:** If a neonate has bloody vaginal discharge, the most common cause is estrogen withdrawal, not trauma or infection [1]. * **Timeline:** Most hormone-related neonatal changes peak at 3–5 days and resolve by 2 weeks of age [1].

Q: A baby is born at 30 weeks of gestation by cesarean delivery. The neonate develops tachypnea, flaring, and subcostal and intercostal retractions immediately after birth. Chest radiography shows a bilateral, diffuse, ground-glass appearance with an air bronchogram sign present. Surfactant therapy was started within 1 hour of the onset of respiratory distress. This is known as what?

Early rescue therapy. ### Explanation The clinical presentation of a preterm neonate (30 weeks) with immediate respiratory distress and a "ground-glass" appearance on X-ray is classic for **Respiratory Distress Syndrome (RDS)** due to surfactant deficiency. **1. Why "Early Rescue Therapy" is Correct:** Surfactant replacement therapy is categorized based on the timing of administration. **Early rescue therapy** refers to the administration of surfactant within the **first 1–2 hours** of life in infants with established signs of RDS. Clinical trials have shown that early rescue therapy is superior to late rescue, as it significantly reduces the risk of neonatal mortality and chronic lung disease (bronchopulmonary dysplasia). **2. Analysis of Incorrect Options:** * **Prophylactic Therapy:** This involves giving surfactant in the delivery room (within 10–30 minutes of birth) to "at-risk" infants *before* symptoms develop. Current guidelines favor early CPAP over routine prophylaxis. * **Late Rescue Therapy:** This refers to surfactant administration more than **2 hours** after birth (usually between 2–12 hours) once the disease has progressed significantly. It is less effective than early rescue. * **Immediate Therapy:** This is not a standard clinical term used in surfactant protocols; the classification relies on "Prophylactic" vs. "Rescue" (Early/Late). **3. NEET-PG Clinical Pearls:** * **Radiology of RDS:** Look for "Ground-glass opacities," "Air bronchograms," and low lung volumes (bell-shaped thorax). * **L/S Ratio:** A Lecithin/Sphingomyelin ratio **<2:1** in amniotic fluid indicates lung immaturity. * **Administration Technique:** The **INSURE** technique (Intubate-Surfactant-Extubate to CPAP) is a high-yield concept for minimizing mechanical ventilation. * **Most common cause of RDS:** Prematurity (Surfactant is produced by Type II Pneumocytes).

Q: A 4-day-old newborn presents with icterus involving the soles. What is the expected total bilirubin level (mg/dL)?

15. ### Explanation The correct answer is **B (15 mg/dL)**. This question tests the clinical assessment of neonatal jaundice using **Kramer’s Rule**, which correlates the cephalocaudal progression of icterus with serum bilirubin levels. #### 1. Why Option B is Correct According to Kramer’s Rule, jaundice in newborns progresses in a head-to-toe direction. When icterus reaches the **palms and soles**, it indicates the highest clinical grade (Zone 5). The estimated serum bilirubin levels for each zone are: * **Zone 1 (Head and neck):** 4–6 mg/dL * **Zone 2 (Upper trunk to umbilicus):** 6–8 mg/dL * **Zone 3 (Lower trunk and thighs):** 8–12 mg/dL * **Zone 4 (Arms and lower legs):** 12–14 mg/dL * **Zone 5 (Palms and soles):** **>15 mg/dL** Since the newborn has icterus involving the soles, the expected bilirubin level is at least 15 mg/dL. #### 2. Why Other Options are Incorrect * **Option D (6 mg/dL):** Corresponds to Zone 1 (Head/Neck). * **Option A (8 mg/dL):** Corresponds to Zone 2 (Upper trunk). * **Option C (12 mg/dL):** Corresponds to Zone 3/4 (Lower trunk/legs). #### 3. Clinical Pearls for NEET-PG * **Visual Limitation:** Clinical estimation is subjective and can be unreliable in dark-skinned infants or under artificial light. Any involvement of the feet (Zone 5) is a "danger sign" requiring immediate laboratory confirmation. * **Physiological vs. Pathological:** Jaundice appearing within the first 24 hours of life is **always pathological**. * **Treatment Threshold:** In a healthy term baby at 4 days (96 hours), a bilirubin of 15 mg/dL usually warrants monitoring or phototherapy depending on risk factors (refer to AAP nomograms). * **Bilirubin Encephalopathy:** High levels (>20–25 mg/dL) risk crossing the blood-brain barrier, leading to Kernicterus.

Q: Which of the following conditions does NOT typically cross the placenta?

Toxic erythema. **Explanation:** The correct answer is **Toxic erythema (Erythema Toxicum Neonatorum)**. This is a benign, self-limiting cutaneous condition seen in healthy newborns. It is not a transplacental pathology but rather an inflammatory reaction of the skin that typically appears 24–48 hours after birth. It is characterized by eosinophilic infiltration and does not involve maternal-fetal transmission. **Analysis of Options:** * **Isoimmune hemolytic anemia & Rh-hemolytic anemia:** These conditions occur due to the transplacental passage of maternal **IgG antibodies**. Since IgG is the only immunoglobulin class that can cross the placenta, it targets fetal red blood cell antigens, leading to hemolysis (e.g., Rh or ABO incompatibility). * **Toxoplasmosis:** This is part of the **TORCH** group of infections. *Toxoplasma gondii* is a protozoan that can cross the placental barrier, especially if the mother acquires a primary infection during pregnancy, leading to congenital toxoplasmosis (classic triad: chorioretinitis, hydrocephalus, and intracranial calcifications). **NEET-PG High-Yield Pearls:** * **IgG vs. IgM:** Only IgG crosses the placenta (via neonatal Fc receptors). IgM, IgA, and IgE do not. Therefore, detecting **IgM** in a newborn’s blood indicates an *in utero* infection rather than maternal transfer. * **Erythema Toxicum Neonatorum:** The hallmark finding on a Tzanck smear or skin biopsy is the presence of numerous **eosinophils**. It spares the palms and soles. * **Transient Neonatal Pustular Melanosis:** Often confused with toxic erythema, but it is present at birth and the aspirate shows **neutrophils** instead of eosinophils.

Q: Which of the following is NOT associated with bronchopulmonary dysplasia?

Theophylline. **Explanation:** **Bronchopulmonary Dysplasia (BPD)** is a chronic lung disease of infancy characterized by the need for supplemental oxygen for at least 28 days after birth. The correct answer is **Theophylline**, as it is not a causative factor; rather, methylxanthines (like Caffeine or Theophylline) are often used in the *management* of apnea of prematurity and to facilitate weaning from mechanical ventilation. **Why the other options are incorrect:** * **Prematurity (B):** This is the single most significant risk factor. Immature lungs have deficient surfactant and underdeveloped antioxidant enzyme systems, making them highly susceptible to injury. * **Barotrauma (C):** High peak inspiratory pressures during mechanical ventilation cause physical stretching and damage to the fragile alveolar-capillary membrane, triggering an inflammatory cascade that leads to BPD. * **Oxygen Therapy (D):** Prolonged exposure to high concentrations of inspired oxygen (FiO2) leads to the production of free radicals (oxidative stress), which damages lung tissue and inhibits normal alveolarization. **NEET-PG High-Yield Pearls:** * **Definition:** BPD is most commonly defined as the need for supplemental oxygen at **36 weeks post-menstrual age (PMA)** for very preterm infants. * **Pathology:** "New BPD" is characterized by **alveolar simplification** (fewer and larger alveoli) rather than the intense fibrosis seen in the "Old BPD" era. * **Prevention:** Antenatal steroids, early use of CPAP (to avoid intubation), and **Caffeine citrate** (Trial of Caffeine for Apnea of Prematurity - CAP trial) are proven to reduce the incidence of BPD. * **Vitamin A:** Intramuscular Vitamin A supplementation has also been shown to reduce BPD risk in extremely low birth weight (ELBW) infants.

Question 1

One of the earliest features of neonatal sepsis is:

Accepted Answer

Alteration of established feeding behaviour

Answer

Shock

Answer

Bleeding

Answer

Sclerema

Question 2

Which of the following conditions is commonly encountered in a female newborn and requires no therapy?

Accepted Answer

Mucoid vaginal discharge

Answer

Enlarged clitoris

Answer

Labial fusion

Answer

Prolapsed urethra

Question 3

Which factor is associated with an increased incidence of sudden infant death syndrome?

Accepted Answer

Maternal smoking

Answer

High socioeconomic status

Answer

Female gender

Answer

Prone sleep positioning

Question 4

All of the following statements regarding jaundice in a newborn are true, EXCEPT:

Accepted Answer

High levels of unconjugated bilirubin may cause kernicterus.

Answer

Physiological jaundice usually peaks after 48 hours.

Answer

Breast milk jaundice usually peaks after day 7.

Answer

All of the above are true.

Question 5

A baby is born at 30 weeks of gestation by cesarean delivery. The neonate develops tachypnea, flaring, and subcostal and intercostal retractions immediately after birth. Chest radiography shows a bilateral, diffuse, ground-glass appearance with an air bronchogram sign present. Surfactant therapy was started within 1 hour of the onset of respiratory distress. This is known as what?

Accepted Answer

Early rescue therapy

Answer

Immediate therapy

Answer

Late rescue therapy

Answer

Prophylactic therapy

Question 6

A 4-day-old newborn presents with icterus involving the soles. What is the expected total bilirubin level (mg/dL)?

Accepted Answer

15

Answer

8

Answer

12

Answer

6

Question 7

If a mother is HBsAg positive, what management is recommended for the newborn?

Accepted Answer

Hepatitis B vaccine at birth and immunoglobulin within 24 hours at separate sites

Answer

Hepatitis B vaccine at 6 weeks

Answer

Hepatitis B vaccine at birth

Answer

Hepatitis B immunoglobulin within 24 hours of birth

Question 8

Which of the following conditions does NOT typically cross the placenta?

Accepted Answer

Toxic erythema

Answer

Isoimmune hemolytic anemia

Answer

Rh-hemolytic anemia

Answer

Toxoplasmosis

Question 9

Which of the following is NOT associated with bronchopulmonary dysplasia?

Accepted Answer

Theophylline

Answer

Prematurity

Answer

Barotrauma

Answer

Oxygen therapy

Question 10

Which of the following is a criterion for a high-risk infant?

Accepted Answer

Maternal employment

Answer

Maternal folate deficiency during pregnancy

Answer

Preeclampsia during pregnancy

Answer

Malpresentation during birth

Neonatology — MCQs

Neonatology — MCQs

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