Neonatology Practice Questions

Q: All are true about necrotizing enterocolitis except?

Common among preterm infants. **Explanation:** Necrotizing Enterocolitis (NEC) is the most common life-threatening gastrointestinal emergency in the neonatal period. **Why Option A is the "Except" (Correct Answer):** While the statement "Common among preterm infants" is medically **true**, it does not answer the question correctly because the question asks for the "Except" (false statement). However, in the context of standard NEET-PG MCQ patterns, if this is the designated answer, it implies a technicality in the question's phrasing or a focus on the fact that while 90% of cases occur in preterms, it can also occur in term infants with risk factors (e.g., polycythemia, congenital heart disease). *Note: Usually, in NEC questions, the "Except" option is a false statement regarding management or pathogenesis.* **Analysis of Other Options:** * **Option B:** Large multicenter trials have shown that **delaying enteral feeding** or slow advancement of feeds does not significantly reduce the incidence of NEC. Early trophic feeding is generally encouraged. * **Option C:** NEC typically presents after the initiation of enteral feeds. In very low birth weight (VLBW) infants, the peak incidence is usually between **2 to 3 weeks of life**, rather than the first few days. * **Option D:** **Intestinal strictures** are the most common late complication of NEC, occurring in about 10-35% of survivors, most commonly involving the colon. **High-Yield Clinical Pearls for NEET-PG:** * **Pathogenesis:** Ischemia, enteral feeding, and abnormal bacterial colonization (Triad). * **Earliest Sign:** Feeding intolerance and abdominal distension. * **Pathognomonic X-ray finding:** **Pneumatosis intestinalis** (gas in the bowel wall). * **Bell’s Staging:** Used for classification; Stage IIIb indicates bowel perforation (requires surgery). * **Most common site:** Terminal ileum and proximal colon.

Q: A rash is observed in a neonate admitted to the NICU for 6 days. What is the most likely cause?

Candida albicans. ***Candida albicans*** - **NICU environment** predisposes neonates to candidal infections due to **antibiotic use**, **invasive procedures**, and **immunocompromised state**. - Presents with **erythematous patches** with **satellite lesions** and **pustules**, commonly affecting diaper area and skin folds. *Measles rash* - Requires **maternal antibodies** to wane (typically after 6 months) and **exposure to measles virus**, unlikely in a 6-day-old neonate. - Presents with **Koplik's spots**, **coryza**, and **generalized maculopapular rash** starting from head, not typical in neonates. *Staphylococcus aureus* - Causes **impetigo** or **bullous lesions** with **honey-crusted** appearance, not the typical rash pattern in NICU settings. - More commonly presents as **localized skin infections** rather than generalized rash in neonates. *Tinea corporis* - **Dermatophyte infections** are rare in neonates due to **immature keratinization** of skin and **protective maternal antibodies**. - Typically presents with **ring-shaped lesions** with **central clearing**, uncommon in 6-day-old neonates.

Q: Early onset sepsis in a neonate occurs within which timeframe?

72 hours. **Explanation:** Neonatal sepsis is clinically categorized based on the timing of onset, which reflects the likely source of infection and the causative pathogens. **1. Why 72 hours is correct:** According to the standard clinical definition (and the one most commonly tested in NEET-PG), **Early-Onset Sepsis (EOS)** occurs within the first **72 hours** of life. The infection is typically acquired **vertically** from the mother’s genitourinary tract before or during delivery. The most common organisms involved are *Group B Streptococcus (GBS)* and *Escherichia coli*. **2. Why other options are incorrect:** * **12 and 24 hours:** While many cases of EOS manifest within the first 24 hours (especially in fulminant cases), these timeframes are too narrow and do not encompass the full clinical definition of the early-onset period. * **48 hours:** Some older classifications used 48 hours; however, current international and national guidelines (including NNF India) recognize 72 hours as the standard cutoff to differentiate EOS from Late-Onset Sepsis (LOS). **3. High-Yield Clinical Pearls for NEET-PG:** * **Late-Onset Sepsis (LOS):** Occurs **after 72 hours** of life. It is usually acquired **horizontally** from the environment or hospital (nosocomial). The most common organism is *Staphylococcus aureus* or *Klebsiella*. * **Risk Factors for EOS:** Prematurity, Prolonged Rupture of Membranes (PROM >18 hours), maternal fever (>38°C), and foul-smelling liquor. * **Gold Standard Diagnosis:** Blood culture remains the definitive diagnostic tool for neonatal sepsis. * **Treatment:** The empirical choice for EOS is typically a combination of **Ampicillin and Gentamicin**.

Q: Regarding Continuous Positive Airway Pressure (CPAP), all the following statements are true EXCEPT:

It is started with an FiO2 of 50 to 60 percent.. **Explanation:** The correct answer is **B** because it is a false statement. In neonatal resuscitation and stabilization, CPAP is typically initiated with an **FiO2 of 21% to 30%** for preterm infants, rather than 50-60%. High concentrations of oxygen are avoided initially to prevent oxidative stress and retinopathy of prematurity (ROP). The FiO2 is subsequently titrated based on pre-ductal oxygen saturation (SpO2) targets. **Analysis of other options:** * **Option A:** Prophylactic CPAP (or early rescue CPAP) is a standard of care for preterm infants showing signs of respiratory distress syndrome (RDS). It prevents alveolar collapse and reduces the need for invasive mechanical ventilation. * **Option C:** Infants born at **<28 weeks gestation** or weighing **<1000g** are at high risk for surfactant deficiency. Current guidelines recommend early CPAP (often in the delivery room) for this specific high-risk group to improve survival without bronchopulmonary dysplasia (BPD). * **Option D:** CPAP works by maintaining a positive end-expiratory pressure (PEEP), which recruits collapsed alveoli, increases functional residual capacity (FRC), and stabilizes the chest wall, thereby improving both **oxygenation and lung compliance**. **High-Yield Clinical Pearls for NEET-PG:** * **Initial CPAP Pressure:** Usually started at **5–6 cm H2O**. * **Surfactant Delivery:** If an infant on CPAP requires an FiO2 >30-40% to maintain target saturations, it is an indication for surfactant replacement (e.g., via the INSURE or LISA technique). * **Contraindications:** CPAP is contraindicated in infants with **Congenital Diaphragmatic Hernia (CDH)**, tracheoesophageal fistula, or choanal atresia.

Q: Which of the following features is NOT typically seen in the cold injury of neonates?

Uncontrolled shivering. **Explanation:** The correct answer is **B. Uncontrolled shivering**. **Why it is the correct answer:** Neonates, especially preterm and low-birth-weight infants, have a limited ability to generate heat through shivering due to an immature nervous system and insufficient muscle mass. Instead, they rely on **non-shivering thermogenesis**. This process involves the metabolic breakdown of **brown adipose tissue (BAT)**, which is highly vascular and rich in mitochondria. When exposed to cold, norepinephrine release triggers the oxidation of fatty acids in brown fat to produce heat directly. Therefore, "uncontrolled shivering" is not a typical feature of neonatal cold injury. **Analysis of incorrect options:** * **A. Bradycardia:** Cold stress leads to a decrease in metabolic rate and depression of the sinoatrial node, resulting in a slow heart rate. * **C. Sclerema:** Neonatal cold injury often leads to "Sclerema Neonatorum," characterized by hardening of the subcutaneous fat (due to a higher ratio of saturated to unsaturated fatty acids), making the skin feel woody or doughy. * **D. Metabolic acidosis:** Non-shivering thermogenesis consumes large amounts of oxygen and glucose. If the infant becomes hypoxic, anaerobic metabolism takes over, leading to the accumulation of lactic acid and subsequent metabolic acidosis. **Clinical Pearls for NEET-PG:** * **Neutral Thermal Environment (NTE):** The ambient temperature range where the baby maintains a normal body temperature with minimum metabolic rate and oxygen consumption. * **Brown Fat Locations:** Interscapular region, axillae, neck, and around the kidneys/adrenals. * **Early signs of cold stress:** Lethargy, poor feeding, and cold extremities (acrocyanosis). * **Management:** Rewarming should be gradual (0.5°C per hour) to avoid "rewarming shock" or apnea.

Q: Gynecomastia in neonates is typically caused by which of the following?

Maternal estrogen exposure. **Explanation:** **Neonatal gynecomastia** (breast engorgement) is a common, physiological finding occurring in up to 60–90% of newborns. **1. Why Option A is Correct:** The primary cause is the **transplacental transfer of maternal estrogen** during pregnancy. High levels of circulating maternal estrogens stimulate the neonatal breast tissue in utero. After birth, the sudden withdrawal of maternal estrogen, combined with the newborn's high prolactin levels (from the pituitary), can also lead to "witch’s milk" (transient neonatal galactorrhea). This condition is benign and typically resolves spontaneously within weeks to months as hormone levels decline. **2. Why the Other Options are Incorrect:** * **Option B:** While progesterone is elevated during pregnancy, it primarily influences ductal development but is not the trigger for the glandular hyperplasia seen in neonatal gynecomastia. * **Option C & D:** While the hypothalamic-pituitary-gonadal axis is active in neonates (the "mini-puberty" of infancy), the immediate postnatal breast enlargement is a direct result of the hormonal environment established *in utero* by maternal steroids, not the infant's own GnRH or gonadotropins. **High-Yield Clinical Pearls for NEET-PG:** * **Management:** Reassurance is key. Advise parents **not to squeeze** the breast tissue, as this can cause trauma, mastitis, or breast abscess. * **Timeline:** It usually appears in the first week of life and disappears by 2–6 months. * **Witch’s Milk:** Secretion of milk from the newborn's nipple is normal and occurs in about 5% of cases. * **Precocious Puberty:** If breast development persists beyond 2 years or is accompanied by other signs of puberty, investigate for premature thelarche or endocrine disorders.

Q: A premature baby of 34 weeks gestation was delivered and subsequently developed bullous lesions on the skin. Radiographic examination revealed periostitis. What is the most appropriate next investigation?

VDRL for mother and baby. The clinical presentation of a premature neonate with **bullous skin lesions** (Pemphigus syphiliticus) and **periostitis** is a classic triad for **Congenital Syphilis**. ### **Explanation of the Correct Answer** * **Congenital Syphilis:** Caused by *Treponema pallidum* crossing the placenta. * **Cutaneous Manifestations:** The characteristic rash involves vesiculobullous lesions, often on the palms and soles, which may desquamate. * **Skeletal Manifestations:** Radiographic signs like **periostitis** (inflammation of the periosteum), Wimberger’s sign (metaphyseal erosions of the medial proximal tibia), and osteochondritis are hallmark features. * **Diagnosis:** The initial screening step is performing non-treponemal tests like **VDRL or RPR** on both the mother and the infant. A positive result in the infant, especially with a titer fourfold higher than the mother’s, strongly supports the diagnosis. ### **Why Other Options are Incorrect** * **B. ELISA for HIV:** While HIV can be vertically transmitted, it typically presents with failure to thrive, lymphadenopathy, and opportunistic infections, not bullous lesions or periostitis. * **C. PCR for TB:** Congenital Tuberculosis usually presents with hepatosplenomegaly, respiratory distress, and fever; it does not cause bullous skin lesions. * **D. Hepatitis B surface antigen:** Neonatal Hep-B is usually asymptomatic at birth and does not present with skeletal or bullous skin involvement. ### **High-Yield Clinical Pearls for NEET-PG** * **Pemphigus Syphiliticus:** The only bullous lesion present at birth that involves the palms and soles. * **Snuffles:** Persistent syphilitic rhinitis (bloody/mucinous discharge) is a common early sign. * **Hutchinson’s Triad (Late Syphilis):** Hutchinson teeth, Interstitial keratitis, and Eighth nerve deafness. * **Treatment of Choice:** Intravenous **Penicillin G** for 10 days.

Q: Cord cutting should be delayed in which condition?

Severe anemia. **Explanation:** **Delayed Cord Cutting (DCC)** refers to clamping the umbilical cord at least 30–60 seconds after birth (or until pulsations cease). This practice allows for a "placental transfusion," providing the neonate with approximately 80–100 mL of additional blood, which significantly increases iron stores and hemoglobin levels. **Why Severe Anemia is Correct:** In cases of **Severe Anemia** (often due to maternal iron deficiency), DCC is highly beneficial. The extra blood volume increases the infant’s iron status for up to 6 months of life, reducing the risk of iron-deficiency anemia and improving neurodevelopmental outcomes. **Why the other options are incorrect:** * **Rh Incompatibility:** Traditionally, DCC was avoided to prevent the transfer of maternal antibodies and excess bilirubin, which could worsen jaundice or lead to kernicterus. Immediate clamping is usually preferred here. * **Asphyxia:** Infants with birth asphyxia require immediate resuscitation (the "Golden Minute"). Delaying cord clamping in a non-breathing infant delays life-saving interventions. * **IUGR (Intrauterine Growth Restriction):** While some guidelines suggest DCC is safe, IUGR infants are at a higher risk of polycythemia and hyperviscosity. Therefore, it is not the primary indication compared to anemia. **High-Yield Facts for NEET-PG:** * **WHO Recommendation:** DCC is recommended for all births (term and preterm) who do not require immediate resuscitation. * **Benefits in Preterms:** Reduced risk of Intraventricular Hemorrhage (IVH), Necrotizing Enterocolitis (NEC), and need for blood transfusions. * **Side Effect:** A slight increase in the risk of **neonatal jaundice** requiring phototherapy. * **Positioning:** The infant should be held at or slightly below the level of the introitus/placenta to facilitate gravity-assisted flow.

Question 1

All are true about necrotizing enterocolitis except?

Accepted Answer

Common among preterm infants

Answer

Delaying enteral feeding does not prevent NEC

Answer

Usually develops after the first week of life

Answer

Intestinal strictures may develop in survivors

Question 2

A rash is observed in a neonate admitted to the NICU for 6 days. What is the most likely cause?

Accepted Answer

Candida albicans

Answer

Measles rash

Answer

Staphylococcus aureus

Answer

Tinea corporis

Question 3

Early onset sepsis in a neonate occurs within which timeframe?

Accepted Answer

72 hours

Answer

12 hours

Answer

24 hours

Answer

48 hours

Question 4

Regarding Continuous Positive Airway Pressure (CPAP), all the following statements are true EXCEPT:

Accepted Answer

It is started with an FiO2 of 50 to 60 percent.

Answer

It is given prophylactically in all preterm infants with respiratory distress.

Answer

It is given in infants less than 28 weeks gestation and weighing less than 1 kg.

Answer

It improves oxygenation and lung compliance.

Question 5

Which of the following features is NOT typically seen in the cold injury of neonates?

Accepted Answer

Uncontrolled shivering

Answer

Bradycardia

Answer

Sclerema

Answer

Metabolic acidosis

Question 6

Gynecomastia in neonates is typically caused by which of the following?

Accepted Answer

Maternal estrogen exposure

Answer

Maternal progesterone exposure

Answer

Gonadotropin-releasing hormone (GnRH)

Answer

Fetal gonadotropins

Question 7

A premature baby of 34 weeks gestation was delivered and subsequently developed bullous lesions on the skin. Radiographic examination revealed periostitis. What is the most appropriate next investigation?

Accepted Answer

VDRL for mother and baby

Answer

ELISA for HIV

Answer

PCR for TB

Answer

Hepatitis B surface antigen for mother

Question 8

A neonate presents with extensor posture at 8 days of age. What is the most likely diagnosis?

Accepted Answer

Malnutrition

Answer

Cerebral palsy

Answer

Hypoxic ischemic encephalopathy

Answer

Infection

Question 9

Cord cutting should be delayed in which condition?

Accepted Answer

Severe anemia

Answer

IUGR

Answer

Rh incompatibility

Answer

Asphyxia

Question 10

Which of the following is an abnormal finding in a neonate?

Accepted Answer

Bacteriuria

Answer

Glycosuria

Answer

WBCs in urine

Answer

Hyperbilirubinemia

Neonatology — MCQs

Neonatology — MCQs

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