Neonatology Practice Questions

Q: Which of the following can cause hyperbilirubinemia in a child?

Breast milk jaundice. **Explanation:** **Correct Answer: A. Breast milk jaundice** **Mechanism:** Breast milk jaundice is a common cause of unconjugated hyperbilirubinemia in neonates. It typically occurs after the first week of life (peaking at 2 weeks). The underlying pathophysiology involves substances in breast milk, such as **beta-glucuronidase** and non-esterified fatty acids, which inhibit the enzyme **UDP-glucuronosyltransferase (UGT1A1)** and increase the enterohepatic circulation of bilirubin. **Why the other options are incorrect:** * **B. Cystic Fibrosis:** While CF can cause hepatobiliary issues (like neonatal cholestasis or biliary cirrhosis) in older children due to inspissated bile, it is not a primary or common cause of neonatal hyperbilirubinemia compared to breast milk jaundice. * **C. Fanconi’s Syndrome:** This is a generalized proximal renal tubular dysfunction (leading to loss of glucose, amino acids, and phosphates in urine). It does not involve bilirubin metabolism or the hepatobiliary system. (Note: Do not confuse this with *Fanconi Anemia*, which is a DNA repair defect). **High-Yield NEET-PG Pearls:** * **Breastfeeding Jaundice vs. Breast Milk Jaundice:** Breastfeeding jaundice occurs in the **first week** due to *inadequate* milk intake (dehydration/decreased calorie intake). Breast milk jaundice occurs **after the first week** in healthy, thriving infants. * **Management:** Continue breastfeeding. If bilirubin levels are dangerously high, brief interruption (24–48 hours) can lead to a rapid drop, but this is rarely necessary. * **Kramer’s Rule:** Used for clinical assessment of jaundice progression (Cephalo-caudal progression). * **Crigler-Najjar Syndrome:** A severe genetic deficiency of UGT1A1 causing persistent unconjugated hyperbilirubinemia.

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: In a neonate with asymptomatic hypoglycemia, immediate treatment should include which of the following?

None of the above. ### Explanation The management of neonatal hypoglycemia is a high-yield topic for NEET-PG, and the distinction between **symptomatic** and **asymptomatic** cases is critical. **1. Why "None of the above" is correct:** According to the American Academy of Pediatrics (AAP) and standard protocols, the first-line management for an **asymptomatic** neonate with hypoglycemia is **enteral feeding** (breastfeeding or formula). Intravenous (IV) dextrose boluses are reserved for symptomatic neonates or those who fail to respond to enteral feeds. None of the options provided (A, B, or C) represent the standard initial management for an asymptomatic case. **2. Analysis of Incorrect Options:** * **Option A (100 mg/kg Dextrose):** This is a dosage calculation, not a standard clinical order. While 2 ml/kg of 10% Dextrose equals 200 mg/kg, "100 mg/kg" is sub-therapeutic for a bolus. * **Option B (2 mg/kg 10% Dextrose):** This is a common distractor. The correct dose for a symptomatic bolus is **2 ml/kg** of 10% Dextrose (which equals 200 mg/kg), not 2 mg/kg. * **Option C (2 ml/kg 25% Dextrose):** 25% Dextrose is **hypertonic** and contraindicated in neonates as a bolus due to the risk of rebound hypoglycemia and intracranial hemorrhage (due to rapid osmolarity changes). Only 10% Dextrose (D10W) is used for boluses in neonatology. **3. Clinical Pearls for NEET-PG:** * **Definition:** Hypoglycemia in neonates is generally defined as blood glucose ** 12 mg/kg/min, investigations for hyperinsulinism (e.g., Critical Sample) should be initiated.

Q: According to the Sarnat staging of hypoxic-ischemic encephalopathy (HIE), in which stage are neonatal seizures most commonly seen?

Stage II. **Explanation:** The **Sarnat and Sarnat Staging** is a clinical tool used to grade the severity of Hypoxic-Ischemic Encephalopathy (HIE) in newborns. **Why Stage II is correct:** Stage II (Moderate HIE) is characterized by **cerebral irritability**. In this stage, the neonate is lethargic or obtunded, showing increased muscle tone and brisk deep tendon reflexes. Crucially, this is the stage where **neonatal seizures are most frequent and prominent**. The EEG in Stage II typically shows a "periodic" or "burst-suppression" pattern, reflecting significant but potentially reversible cortical dysfunction. **Why other options are incorrect:** * **Stage I (Mild):** The infant is hyper-alert and jittery. Sympathetic activity is high (tachycardia, mydriasis), but **seizures are absent**, and the EEG is usually normal. * **Stage III (Severe):** The infant is in a stupor or coma. While brain injury is most severe here, the brain is often "electrically silent." Seizures are **uncommon** in this stage because the neuronal damage is so extensive that the cortex cannot generate or sustain organized seizure activity. * **Stage IV:** There is no Stage IV in the classic Sarnat classification; it consists of only three stages. **NEET-PG High-Yield Pearls:** * **Stage I:** Duration <24 hours; prognosis is excellent. * **Stage II:** Duration 2–14 days; prognosis is variable. * **Stage III:** Duration weeks; high mortality and severe long-term neurological deficits (e.g., cerebral palsy). * **Key differentiator:** If a question mentions "hyper-alert" baby, think Stage I. If "seizures" are mentioned, think Stage II. If "absent reflexes/flaccid," think Stage III.

Q: Kernicterus is associated with which of the following?

All of the above. **Explanation:** **Kernicterus** (Chronic Bilirubin Encephalopathy) is a permanent neurological sequela caused by the deposition of **unconjugated bilirubin** in specific brain regions, most notably the **Basal Ganglia** (Globus pallidus and subthalamic nuclei), **Brainstem nuclei** (auditory and oculomotor), and the **Cerebellum**. The correct answer is **D (All of the above)** because the clinical features of Kernicterus directly reflect the damage to these specific anatomical sites: 1. **Choreoathetoid Cerebral Palsy:** Damage to the **Basal Ganglia** results in extrapyramidal movement disorders. Choreoathetosis is the hallmark motor manifestation of chronic bilirubin toxicity. 2. **Hearing Abnormalities:** Bilirubin has a high affinity for the **Auditory Nerve (CN VIII)** and the **Cochlear Nuclei** in the brainstem. This typically manifests as sensorineural hearing loss or auditory neuropathy spectrum disorder. 3. **Upward Gaze Palsy:** Involvement of the **Oculomotor nuclei** in the brainstem leads to characteristic vertical gaze abnormalities, specifically a limitation of upward gaze (Parinaud-like syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site affected:** Globus Pallidus. * **MRI Finding:** High-intensity signals in the Globus Pallidus on T2-weighted images. * **Clinical Triad:** Extrapyramidal disturbances (Athetosis), Auditory abnormalities, and Oculomotor impairment. * **Teeth:** May show enamel hypoplasia or green staining (bilirubin staining of deciduous teeth). * **Prevention:** Timely management of neonatal jaundice using the **Bhutani Nomogram** to guide phototherapy and exchange transfusion.

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).

Question 1

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 2

Which of the following can cause hyperbilirubinemia in a child?

Accepted Answer

Breast milk jaundice

Answer

Cystic fibrosis

Answer

Fanconi's syndrome

Answer

All of the above

Question 3

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

Accepted Answer

Prematurity

Answer

Anemia

Answer

Infection

Answer

Diabetes

Question 4

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 5

In a neonate with asymptomatic hypoglycemia, immediate treatment should include which of the following?

Accepted Answer

None of the above

Answer

100 mg/kg Dextrose

Answer

2 mg/kg 10% Dextrose

Answer

2 ml/kg 25% Dextrose

Question 6

A newborn baby presented with profuse bleeding from the umbilical stump. The rest of the examination and PT, APTT are within normal limits. What is the most probable diagnosis?

Accepted Answer

Glanzmann thrombasthenia

Answer

Factor X deficiency

Answer

Von Willebrand disease

Answer

Bernard-Soulier disease

Question 7

According to the Sarnat staging of hypoxic-ischemic encephalopathy (HIE), in which stage are neonatal seizures most commonly seen?

Accepted Answer

Stage II

Answer

Stage I

Answer

Stage III

Answer

Stage IV

Question 8

Kernicterus is associated with which of the following?

Accepted Answer

All of the above

Answer

Choreoathetoid cerebral palsy

Answer

Hearing abnormalities

Answer

Upward gaze palsy

Question 9

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 10

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

Accepted Answer

NIRS

Answer

PET

Answer

Radionuclide imaging

Answer

MRI angiography

Neonatology — MCQs

Neonatology — MCQs

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