Neonatology Practice Questions

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.

Q: Pneumatosis intestinalis is most often seen in?

Neonatal necrotising enterocolitis. **Explanation:** **Pneumatosis intestinalis** is the pathognomonic radiographic finding for **Necrotizing Enterocolitis (NEC)**. It refers to the presence of gas within the subserosal or submucosal layers of the bowel wall. This occurs when the integrity of the intestinal mucosa is breached (due to ischemia or infection), allowing gas-producing bacteria to invade the bowel wall and release hydrogen gas. * **Why Option A is correct:** In NEC, the combination of mucosal injury, enteral feeding, and bacterial proliferation leads to intramural gas. On an X-ray, this appears as linear or curvilinear radiolucency following the contour of the bowel loops. * **Why Option B is incorrect:** Midgut volvulus typically presents with signs of high intestinal obstruction (e.g., "double bubble" or "corkscrew" appearance on contrast studies). While it can lead to ischemia, pneumatosis is not its hallmark. * **Why Option C is incorrect:** Meconium peritonitis is a chemical peritonitis resulting from intrauterine bowel perforation. The classic radiographic finding is **intra-abdominal calcifications**, not intramural gas. * **Why Option D is incorrect:** Neonatal visceral perforation (often a complication of NEC or spontaneous) results in **Pneumoperitoneum** (free air under the diaphragm/football sign), which is gas *outside* the bowel wall, rather than *within* it. **High-Yield Clinical Pearls for NEET-PG:** * **Bell’s Staging:** Used to grade the severity of NEC. * **Pneumatosis Intestinalis:** Stage II (Definite NEC). * **Portal Venous Gas:** A sign of advanced NEC (Stage III), indicating gas has migrated from the bowel wall into the mesenteric circulation. * **Most common site:** Terminal ileum and proximal colon. * **Initial Management:** NPO (Bowel rest), Nasogastric decompression, and broad-spectrum antibiotics.

Q: Which statement is not true about cephalohaematoma?

Not limited by sutures. **Explanation:** The correct answer is **A (Not limited by sutures)** because this statement is false. A cephalhematoma is a collection of blood between the **periosteum and the skull bone**. Because the periosteum is firmly attached to the edges of each individual cranial bone at the suture lines, the bleeding is physically confined and **cannot cross suture lines**. **Analysis of Options:** * **Option A (Not limited by sutures):** This is the incorrect statement. Caput succedaneum (edema of the scalp) crosses sutures, whereas cephalhematoma does not. * **Option B (Swelling subsides in 3 months):** This is a true statement. Most cephalhematomas resolve spontaneously within 2 to 12 weeks. * **Option C (Caused by periosteal injury):** This is true. It results from the rupture of subperiosteal blood vessels, often due to birth trauma or instrumental delivery (forceps/vacuum). **High-Yield Clinical Pearls for NEET-PG:** 1. **Cephalhematoma vs. Caput Succedaneum:** * *Caput:* Present at birth, crosses sutures, involves soft tissue edema. * *Cephalhematoma:* Appears hours after birth, does **not** cross sutures, involves subperiosteal blood. 2. **Subgaleal Hemorrhage:** This is the "dangerous" one. It occurs between the aponeurosis and periosteum, is **not** limited by sutures, and can lead to massive blood loss and shock. 3. **Complications:** While usually benign, large cephalhematomas can lead to **unconjugated hyperbilirubinemia** (jaundice) as the blood breaks down, or rarely, underlying linear skull fractures. 4. **Management:** Observation only. Incision and drainage are contraindicated due to the high risk of infection (osteomyelitis).

Q: The most likely diagnosis in this child is:

Diaphragmatic hernia. ***Diaphragmatic hernia*** - Classic presentation includes **bowel loops in the hemithorax** on chest X-ray with **mediastinal shift** to the opposite side. - Associated with **scaphoid abdomen** due to abdominal contents herniating into the thoracic cavity through the diaphragmatic defect. *Congenital lobar emphysema* - Shows **hyperinflated lung lobe** with compression of adjacent normal lung tissue, not bowel loops in chest. - Typically affects the **left upper lobe** or **right middle lobe** with characteristic lucent areas on X-ray. *Pneumothorax* - Presents as **air in pleural space** with **collapsed lung** and absent lung markings peripherally. - Shows a **visceral pleural line** separating collapsed lung from pleural air, unlike bowel loops seen in diaphragmatic hernia. *Hyaline membrane disease* - Characterized by **ground glass opacity** and **air bronchograms** throughout both lung fields. - Common in **preterm infants** with **surfactant deficiency**, showing bilateral reticulogranular pattern on chest X-ray.

Q: A newborn develops erythematous papular lesions on the face and trunk after 2-3 days of life. A smear of the pustular lesions is prepared. What cells would be seen in the smear?

Eosinophils. ### Explanation The clinical presentation described is classic for **Erythema Toxicum Neonatorum (ETN)**, the most common benign self-limiting cutaneous eruption in newborns. **Why Eosinophils are the Correct Answer:** Erythema Toxicum Neonatorum typically appears between **24 to 72 hours** of life. It is characterized by erythematous macules, papules, and occasionally pustules ("flea-bite" appearance) on the trunk and face, sparing the palms and soles. The hallmark diagnostic feature of ETN is the presence of **innumerable eosinophils** on a Wright-stained or Giemsa-stained smear of the pustular contents. While the exact etiology is unknown, it is thought to be an immature immune response to microbial colonization of hair follicles. **Analysis of Incorrect Options:** * **Neutrophils:** These are the predominant cells in **Transient Neonatal Pustular Melanosis (TNPM)**. TNPM is present at birth (unlike ETN) and leaves behind hyperpigmented macules. * **Basophils:** These are rarely found in neonatal skin smears and are not associated with common benign newborn rashes. * **Monocytes:** While present in chronic inflammatory processes, they are not the diagnostic cell type for acute neonatal pustular eruptions. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** ETN usually appears at 2–3 days; TNPM is present at birth. * **Distribution:** ETN spares palms and soles; TNPM can involve them. * **Management:** No treatment is required for ETN; it resolves spontaneously within 1–2 weeks. Reassurance to parents is the key. * **Differential Diagnosis:** If a smear shows **bacteria** or **yeast**, consider Staphylococcal pyoderma or Congenital Candidiasis instead of ETN.

Q: What are the benefits of the technique shown below, excluding one option?

Protects from neonatal jaundice. ***Protects from neonatal jaundice*** - **Kangaroo Mother Care (KMC)** does not have established evidence for preventing **neonatal jaundice** or **hyperbilirubinemia**. - While KMC promotes early breastfeeding which may help with bilirubin excretion, it is not recognized as a primary jaundice prevention method. *Protects from hypothermia* - **Skin-to-skin contact** in KMC provides excellent **thermoregulation** through maternal body heat transfer. - Studies show KMC maintains **stable body temperature** in preterm and low birth weight infants better than incubators. *Decreases duration of hospital stay* - **KMC** significantly reduces **length of hospital stay** by promoting faster weight gain and clinical stability. - **Early discharge** is possible due to improved physiological parameters and reduced complications in KMC infants. *Promotes exclusive breastfeeding* - **Skin-to-skin contact** enhances **maternal-infant bonding** and stimulates **prolactin** and **oxytocin** release. - **KMC** increases breastfeeding success rates and promotes **exclusive breastfeeding** duration compared to conventional care.

Question 1

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

Accepted Answer

Tetanus

Answer

Hypoglycemia

Answer

Asphyxia

Answer

Intraventricular bleeding

Question 2

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 3

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 4

Which of the following is NOT associated with bronchopulmonary dysplasia?

Accepted Answer

Theophylline

Answer

Prematurity

Answer

Barotrauma

Answer

Oxygen therapy

Question 5

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

Accepted Answer

Cisapride

Answer

Metoclopramide

Answer

Omeprazole

Answer

Domperidone

Question 6

Pneumatosis intestinalis is most often seen in?

Accepted Answer

Neonatal necrotising enterocolitis

Answer

Midgut volvulus

Answer

Meconium peritonitis

Answer

Neonatal visceral perforation

Question 7

Which statement is not true about cephalohaematoma?

Accepted Answer

Not limited by sutures

Answer

Swelling subsides in 3 months

Answer

Caused by periosteal injury of the skull

Answer

None of the above

Question 8

The most likely diagnosis in this child is:

Accepted Answer

Diaphragmatic hernia

Answer

Congenital lobar emphysema

Answer

Pneumothorax

Answer

Hyaline membrane disease

Question 9

A newborn develops erythematous papular lesions on the face and trunk after 2-3 days of life. A smear of the pustular lesions is prepared. What cells would be seen in the smear?

Accepted Answer

Eosinophils

Answer

Basophils

Answer

Neutrophils

Answer

Monocytes

Question 10

What are the benefits of the technique shown below, excluding one option?

Accepted Answer

Protects from neonatal jaundice

Answer

Protects from hypothermia

Answer

Decreases duration of hospital stay

Answer

Promotes exclusive breastfeeding

Neonatology — MCQs

Neonatology — MCQs

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