Neonatology Practice Questions

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: Congenital anomalies are most severe in which of the following infections?

Rubella infection. **Explanation:** **Congenital Rubella Syndrome (CRS)** is characterized by the highest risk of severe, multisystemic malformations, particularly when the infection occurs during the first trimester (the period of organogenesis). The virus causes chronic focal destruction of cells and mitotic inhibition, leading to a classic triad of **Cataracts, Sensorineural deafness, and Cardiac defects (Patent Ductus Arteriosus).** The severity is inversely proportional to gestational age; infection before 11 weeks leads to anomalies in nearly 100% of cases. **Analysis of Incorrect Options:** * **Mumps:** While mumps during pregnancy is associated with an increased risk of spontaneous abortion in the first trimester, it is **not** a recognized teratogen and does not cause a specific syndrome of congenital anomalies. * **Cytomegalovirus (CMV):** CMV is the most common cause of congenital infection, but it often presents with "damage" (microcephaly, periventricular calcifications, hearing loss) rather than structural "malformations" or "anomalies" as severe as those seen in Rubella. * **Toxoplasma:** Congenital toxoplasmosis typically presents with the Sabin triad (Chorioretinitis, Hydrocephalus, and Intracranial calcifications). While serious, the structural anatomical disruption is generally less extensive than the multisystemic embryopathy of Rubella. **High-Yield Clinical Pearls for NEET-PG:** * **Gregg’s Triad (Rubella):** Cataract, PDA, and Deafness. * **Blueberry Muffin Rash:** Seen in Rubella and CMV (due to extramedullary hematopoiesis). * **Timing:** Rubella risk is highest in the 1st trimester; after 16 weeks, the risk of major anomalies is negligible. * **Vaccination:** Live attenuated vaccines (MMR) are contraindicated during pregnancy. Women should avoid pregnancy for 1 month after vaccination.

Q: All are possible causes of seizures on day 1 of life EXCEPT?

Tetanus. ### Explanation The timing of neonatal seizures is a critical diagnostic clue in NEET-PG questions. The correct answer is **Tetanus** because of its specific incubation period. **1. Why Tetanus is the Correct Answer:** Neonatal Tetanus (*Clostridium tetani*) typically presents between **day 3 and day 14 of life** (classically around day 7, hence the "7th-day disease"). It requires time for the spores introduced via an unclean umbilical cord stump to germinate and for the tetanospasmin toxin to reach the CNS via retrograde axonal transport. It is clinically impossible for tetanus to manifest on the first day of life. **2. Analysis of Incorrect Options (Causes of Day 1 Seizures):** * **Asphyxia (Hypoxic-Ischemic Encephalopathy):** This is the **most common cause** of seizures in the first 24 hours of life. Seizures usually peak within 12–24 hours after a birth injury. * **Hypoglycemia:** Metabolic disturbances, particularly low blood glucose (common in infants of diabetic mothers or SGA babies), frequently trigger seizures within the first few hours of life. * **Intraventricular Bleeding (IVH):** Intracranial hemorrhages (IVH or Subarachnoid hemorrhage) are significant causes of early-onset seizures, especially in preterm neonates or those with birth trauma. **Clinical Pearls for NEET-PG:** * **Most common cause of neonatal seizures:** Perinatal Asphyxia. * **Seizures on Day 1:** Asphyxia, Metabolic (Hypoglycemia, Hypocalcemia), Intracranial hemorrhage. * **Seizures on Day 3–7:** Septicemia, Meningitis, Tetanus, or Inborn Errors of Metabolism. * **Drug of Choice for Neonatal Seizures:** Phenobarbitone. * **Tetanus Prevention:** Immunization of the mother with Tetanus Toxoid (TT/Td) and the "5 Cleans" during delivery.

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

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 2

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 3

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 4

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 5

Congenital anomalies are most severe in which of the following infections?

Accepted Answer

Rubella infection

Answer

Mumps

Answer

Cytomegalovirus (CMV)

Answer

Toxoplasma

Question 6

All are possible causes of seizures on day 1 of life EXCEPT?

Accepted Answer

Tetanus

Answer

Hypoglycemia

Answer

Asphyxia

Answer

Intraventricular bleeding

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 one of the following drugs causes QT prolongation in a premature infant?

Accepted Answer

Cisapride

Answer

Metoclopramide

Answer

Omeprazole

Answer

Domperidone

Neonatology — MCQs

Neonatology — MCQs

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