Neonatology Practice Questions

Q: Unconjugated hyperbilirubinemia is seen in all except?

Biliary atresia. **Explanation:** The core concept in this question is differentiating between **unconjugated (indirect)** and **conjugated (direct)** hyperbilirubinemia. **Why Biliary Atresia is the correct answer:** Biliary atresia is a structural condition characterized by the progressive destruction or absence of the extrahepatic biliary tree. This leads to an obstruction in bile flow, causing **conjugated hyperbilirubinemia** (cholestasis). In this condition, the liver can conjugate bilirubin, but it cannot excrete it into the intestine. Clinically, this presents with jaundice, acholic (clay-colored) stools, and dark urine. **Analysis of Incorrect Options (Causes of Unconjugated Hyperbilirubinemia):** * **Physiological Jaundice:** Caused by increased RBC breakdown and immature hepatic UGT enzyme activity. It is always unconjugated. * **Breast Milk Jaundice:** Occurs due to factors in breast milk (like beta-glucuronidase) that increase enterohepatic circulation of bilirubin. It is unconjugated. * **Gilbert Syndrome:** A genetic defect causing reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, leading to impaired conjugation and mild unconjugated hyperbilirubinemia. **NEET-PG High-Yield Pearls:** 1. **Rule of Thumb:** Any jaundice appearing within the first 24 hours of life or lasting beyond 2 weeks (prolonged jaundice) requires investigation for pathological causes. 2. **Biliary Atresia Diagnosis:** The "Gold Standard" for diagnosis is an **Intraoperative Cholangiogram (IOC)**. The initial screening test is often a HIDA scan (showing no excretion into the bowel). 3. **Treatment:** The surgical procedure of choice for Biliary Atresia is **Kasai Portoenterostomy**, ideally performed before 60 days of life for the best prognosis. 4. **Crigler-Najjar Syndrome:** Another high-yield cause of severe unconjugated hyperbilirubinemia due to total (Type I) or partial (Type II) absence of UGT enzyme.

Q: At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?

Hyperglycemia. **Explanation:** The correct answer is **C. Hyperglycemia**. In fact, growth-restricted fetuses (Fetal Growth Restriction - FGR/IUGR) are prone to **Hypoglycemia**, not hyperglycemia. **Why Hyperglycemia is incorrect (The Medical Concept):** Growth-restricted fetuses have chronic placental insufficiency, leading to poor nutrient transfer. Consequently, they have **depleted glycogen stores** in the liver and heart, and diminished subcutaneous fat (reduced glycerol for gluconeogenesis). Post-delivery, they cannot maintain blood glucose levels, making hypoglycemia a hallmark neonatal complication. **Analysis of other options:** * **Meconium Aspiration (A):** Chronic hypoxia in utero triggers vagal stimulation, leading to the passage of meconium. Combined with reduced amniotic fluid (oligohydramnios), the risk of thick meconium aspiration syndrome (MAS) is high. * **Hypothermia (B):** These neonates have a high surface-area-to-body-mass ratio and lack **brown fat** and subcutaneous adipose tissue, which are essential for non-shivering thermogenesis. * **Polycythemia (D):** Chronic intrauterine hypoxia stimulates fetal **erythropoietin** production, leading to an increased red cell mass (polycythemia) to compensate for low oxygen levels. This can result in hyperviscosity syndrome. **NEET-PG High-Yield Pearls:** * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Commonest cause of Asymmetrical IUGR:** Placental insufficiency (e.g., Preeclampsia). * **Other complications:** Hypocalcemia (due to relative hypoparathyroidism) and Pulmonary Hemorrhage. * **Rule of thumb:** IUGR babies are "Small but Mature," meaning they often have accelerated lung maturity due to chronic stress (increased steroids), reducing the risk of RDS compared to preterm infants of the same weight.

Q: A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. Which of the following is the most likely explanation for this infant's condition?

Diaphragmatic hernia. ### Explanation **Correct Answer: C. Diaphragmatic hernia** The clinical presentation is classic for **Congenital Diaphragmatic Hernia (CDH)**, most commonly the **Bochdalek type** (posterolateral), which occurs on the **left side** in 85% of cases. The underlying pathophysiology involves a defect in the pleuroperitoneal membrane, allowing abdominal viscera (stomach, intestines) to herniate into the thoracic cavity. This leads to: 1. **Scaphoid Abdomen:** Since the abdominal contents are in the chest, the abdomen appears sunken. 2. **Respiratory Distress:** Caused by severe **pulmonary hypoplasia** and pulmonary hypertension. 3. **Physical Findings:** Absent breath sounds on the affected side and shifted heart sounds to the contralateral side (mediastinal shift). **Why Incorrect Options are Wrong:** * **Pneumonia (A):** While it causes respiratory distress, it does not present with a scaphoid abdomen or immediate severe distress at birth. * **Congenital Cystic Adenomatoid Malformation (CCAM) (B):** This is a lung parenchymal abnormality. While it shows cystic areas on X-ray similar to bowel loops, the abdomen would be **normal/protuberant**, not scaphoid. * **Choanal Atresia (D):** This causes upper airway obstruction. Distress is relieved by crying and worsens during feeding; it does not cause unilateral absent breath sounds or a scaphoid abdomen. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of CDH:** Respiratory distress, Scaphoid abdomen, and Cyanosis. * **Management Priority:** **Stabilization first.** Immediate endotracheal intubation is required. **Avoid bag-and-mask ventilation**, as it distends the herniated bowel, further compressing the lungs. * **X-ray Finding:** Presence of air-filled bowel loops in the hemithorax and a mediastinal shift. * **Most common site:** Left posterolateral (Bochdalek). Foramen of Morgagni is anterior and less common.

Q: What is the most common cause of low birth weight babies?

Prematurity. **Explanation:** Low Birth Weight (LBW) is defined by the WHO as a birth weight of less than **2,500 grams**, regardless of gestational age. Globally and in India, the two primary determinants of LBW are **Prematurity** (born before 37 weeks) and **Intrauterine Growth Restriction (IUGR)**. **Why Prematurity is the Correct Answer:** Prematurity is the leading cause of LBW. Since the majority of fetal weight gain occurs during the third trimester (specifically after 28 weeks), any infant born before 37 weeks has insufficient time to accumulate subcutaneous fat and muscle mass, resulting in a lower birth weight. In clinical practice, most LBW babies are premature, whereas most IUGR babies are "Small for Gestational Age" (SGA). **Analysis of Incorrect Options:** * **A. Anemia:** While maternal anemia is a significant risk factor for IUGR and preterm labor, it is a *contributory* factor rather than the direct classification or most common cause. * **B. Infection:** Maternal infections (e.g., TORCH, UTIs) can trigger preterm labor or cause fetal growth restriction, but they represent a specific etiology rather than the most frequent underlying mechanism. * **D. Diabetes:** Maternal diabetes (especially Gestational Diabetes) is typically associated with **Macrosomia** (birth weight >4000g or >90th percentile) rather than low birth weight, unless complicated by severe vasculopathy. **High-Yield Clinical Pearls for NEET-PG:** * **VLBW (Very Low Birth Weight):** <1,500 grams. * **ELBW (Extremely Low Birth Weight):** <1,000 grams. * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Kangaroo Mother Care (KMC):** The most effective intervention for stable LBW babies to prevent hypothermia and promote growth.

Q: Which bedside monitoring tool is commonly used for neonates with hypoxic-ischemic encephalopathy (HIE)?

aEEG (amplitude-integrated electroencephalography). ### Explanation **Correct Answer: A. aEEG (amplitude-integrated electroencephalography)** **Why it is correct:** In neonates with Hypoxic-Ischemic Encephalopathy (HIE), **aEEG** is the preferred bedside monitoring tool because it provides a simplified, continuous trend of brain electrical activity. It uses a limited number of electrodes to compress raw EEG data into a time-compressed display, allowing clinicians to monitor background activity, detect subclinical seizures, and assess the severity of encephalopathy in real-time. It is particularly vital for identifying candidates for **therapeutic hypothermia** and predicting long-term neurodevelopmental outcomes. **Why the other options are incorrect:** * **B. heeG:** This is a non-existent medical term. * **C. cEEG (continuous electroencephalography):** While cEEG is the "gold standard" for diagnosing seizures, it is technically demanding, requires specialized interpretation by a neurologist, and is often not available for immediate, continuous bedside use in many NICUs. aEEG is the more common "bedside" screening tool. * **D. nEEG:** This is not a standard clinical abbreviation for neonatal monitoring. **High-Yield Clinical Pearls for NEET-PG:** * **Sarnat Staging:** Clinical tool used to grade HIE (Stage I: Hyperalert; Stage II: Lethargic/Seizures; Stage III: Comatose/Flaccid). * **Therapeutic Hypothermia:** Indicated for moderate-to-severe HIE (Sarnat Stage II/III). It must be initiated within **6 hours** of birth, maintaining a core temperature of **33.5°C for 72 hours**. * **aEEG Patterns:** A "flat trace" or "burst suppression" on aEEG indicates severe brain injury and a poor prognosis. * **MRI Brain:** The imaging modality of choice for HIE, ideally performed between **3–5 days** of life (DWI sequence is most sensitive early on).

Q: Which of the following is NOT a feature of the classical triad of congenital rubella syndrome?

Glaucoma. **Explanation** The correct answer is **D. Glaucoma**. Congenital Rubella Syndrome (CRS) occurs due to transplacental transmission of the Rubella virus, primarily during the first trimester of pregnancy. The "Classical Triad," also known as **Gregg’s Triad**, consists of specific malformations that are hallmark features of the syndrome. 1. **Why Glaucoma is the correct answer:** While glaucoma (specifically infantile glaucoma) can occur in CRS, it is **not** part of the classical triad. In the context of NEET-PG, examiners often use glaucoma as a distractor because it is an ocular manifestation, but it is distinct from the primary triad component (Cataract). 2. **Why the other options are incorrect (Components of Gregg’s Triad):** * **Cataract (Option A):** This is the most common ocular manifestation of the triad. It is often bilateral and described as a "pearly white" nuclear opacification. * **Congenital Heart Disease (Option B):** The most characteristic cardiac lesion is **Patent Ductus Arteriosus (PDA)**, followed by peripheral pulmonary artery stenosis. * **Deafness (Option C):** Sensorineural hearing loss is the most common single finding in CRS and is often the only manifestation in late-presenting cases. **High-Yield Clinical Pearls for NEET-PG:** * **Expanded CRS:** Beyond the triad, look for "Blueberry muffin" spots (extramedullary hematopoiesis), microcephaly, and radiolucent bone lesions ("celery stalking"). * **Timing:** The risk of fetal damage is highest (up to 90%) if the mother is infected before the 11th week of gestation. * **Diagnosis:** Confirmed by the presence of **Rubella-specific IgM** antibodies in the infant or persistence of IgG beyond 6–12 months. * **Prevention:** Live attenuated vaccine (RA 27/3 strain). **Contraindicated in pregnancy**; pregnancy should be avoided for 1 month after vaccination.

Q: All the following are true about transient tachypnea of the newborn except?

If untreated, distress can progress to respiratory failure. **Explanation:** **Transient Tachypnea of the Newborn (TTN)**, also known as "Wet Lung Disease," is a benign, self-limiting condition. **Why Option D is the correct answer (The Exception):** TTN is characterized by its **transient** nature. By definition, it is a non-progressive condition that typically resolves within 24 to 72 hours with minimal supportive care (such as supplemental oxygen). Unlike Respiratory Distress Syndrome (RDS) or Meconium Aspiration Syndrome, TTN **does not progress to respiratory failure** or require long-term mechanical ventilation if left to its natural course. **Analysis of Incorrect Options:** * **Option A:** TTN is most **commonly seen in term** or late-preterm babies. Risk factors include elective Cesarean section (due to lack of thoracic squeeze and hormonal surges that trigger fluid resorption) and maternal diabetes. * **Option B:** The pathophysiology involves **delayed clearance of fetal lung fluid** by the pulmonary lymphatic system and delayed activation of epithelial sodium channels (ENaC). * **Option C:** Chest X-ray typically shows **hyperexpanded lung fields**, prominent vascular markings (perihilar streaking/“sunburst appearance”), and occasionally fluid in the horizontal fissure. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Early onset of tachypnea (RR >60) shortly after birth. * **Management:** Primarily supportive (Oxygen via hood or nasal cannula). * **Diagnosis of Exclusion:** It is often a diagnosis made after ruling out neonatal pneumonia or RDS. * **Key Trigger:** Elective C-section without labor is the most common predisposing factor mentioned in exams.

Q: Cerebral blood flow in an asphyxiated child is best measured by:

NIRS. **Explanation:** In the context of neonatal asphyxia (Hypoxic-Ischemic Encephalopathy), the assessment of cerebral perfusion and oxygenation requires a method that is non-invasive, continuous, and available at the bedside. **Why NIRS is the Correct Answer:** **Near-Infrared Spectroscopy (NIRS)** is the preferred clinical tool for monitoring cerebral blood flow (CBF) and oxygenation in neonates. It utilizes the ability of near-infrared light to penetrate the skull and be absorbed by hemoglobin. By measuring the ratio of oxygenated to deoxygenated hemoglobin, it provides a real-time **Regional Oxygen Saturation (rSO2)** value. This serves as a surrogate for cerebral blood flow, allowing clinicians to detect fluctuations in perfusion immediately at the bedside without transporting a critically ill, ventilated neonate. **Why Other Options are Incorrect:** * **PET (Positron Emission Tomography):** While the gold standard for measuring metabolic activity and blood flow, it involves exposure to ionizing radiation and requires transport to a specialized suite, making it impractical for an unstable asphyxiated neonate. * **Radionuclide Imaging:** Similar to PET, this involves radioactive tracers and lacks the real-time, continuous monitoring capability required in the NICU. * **MRI Angiography:** MRA provides excellent structural detail of blood vessels but does not measure dynamic, real-time blood flow or tissue oxygenation. The logistical challenge of moving a sick neonate into an MRI scanner limits its use for routine monitoring. **Clinical Pearls for NEET-PG:** * **NIRS Normal Range:** Cerebral rSO2 in neonates is typically **60–80%**. * **Autoregulation:** In asphyxiated neonates, cerebral autoregulation is often "pressure-passive," meaning CBF fluctuates directly with systemic blood pressure; NIRS is vital to monitor this. * **Other uses:** NIRS is also used to monitor renal perfusion and mesenteric oxygenation (to screen for NEC).

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).

Question 1

Unconjugated hyperbilirubinemia is seen in all except?

Accepted Answer

Biliary atresia

Answer

Physiological jaundice

Answer

Breast milk jaundice

Answer

Gilbert syndrome

Question 2

At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?

Accepted Answer

Hyperglycemia

Answer

Meconium aspiration

Answer

Hypothermia

Answer

Polycythemia

Question 3

A female infant is born prematurely at 28 weeks' gestation. Shortly after birth, she shows signs of dyspnea, cyanosis, and tachypnea. She is placed on a ventilator for assisted breathing, and a diagnosis of neonatal respiratory distress syndrome (hyaline membrane disease) is made. Which of the following is the cause of this syndrome?

Accepted Answer

Lack of fetal pulmonary maturity and deficiency of surfactant

Answer

Bronchopulmonary dysplasia

Answer

Intraventricular brain hemorrhage

Answer

Necrotizing enterocolitis

Question 4

A newborn infant develops respiratory distress immediately after birth. The infant's abdomen is scaphoid. No breath sounds are heard on the left side of the chest, but they are audible on the right. Following successful intubation with little or no improvement in clinical status, an emergency chest x-ray was performed. Which of the following is the most likely explanation for this infant's condition?

Accepted Answer

Diaphragmatic hernia

Answer

Pneumonia

Answer

Congenital cystic adenomatoid malformation

Answer

Choanal atresia

Question 5

What is the most common cause of low birth weight babies?

Accepted Answer

Prematurity

Answer

Anemia

Answer

Infection

Answer

Diabetes

Question 6

Which bedside monitoring tool is commonly used for neonates with hypoxic-ischemic encephalopathy (HIE)?

Accepted Answer

aEEG (amplitude-integrated electroencephalography)

Answer

heeG

Answer

cEEG (continuous electroencephalography)

Answer

nEEG

Question 7

Which of the following is NOT a feature of the classical triad of congenital rubella syndrome?

Accepted Answer

Glaucoma

Answer

Cataract

Answer

Congenital heart disease (CHD)

Answer

Deafness

Question 8

All the following are true about transient tachypnea of the newborn except?

Accepted Answer

If untreated, distress can progress to respiratory failure

Answer

Commonly seen in term babies

Answer

Due to delayed clearance of lung fluid

Answer

Chest X-ray may show hyperexpanded lung fields

Question 9

Cerebral blood flow in an asphyxiated child is best measured by:

Accepted Answer

NIRS

Answer

PET

Answer

Radionuclide imaging

Answer

MRI angiography

Question 10

One of the earliest features of neonatal sepsis is:

Accepted Answer

Alteration of established feeding behaviour

Answer

Shock

Answer

Bleeding

Answer

Sclerema

Neonatology — MCQs

Neonatology — MCQs

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