Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 151: What is the most common cause of respiratory distress in a neonate within the first 24 hours of birth?

A. Neonatal sepsis
B. Meconium aspiration syndrome (Correct Answer)
C. Bacterial pneumonia
D. Air embolism

Explanation: **Explanation:** **Meconium Aspiration Syndrome (MAS)** is the most common cause of respiratory distress in term and post-term neonates. It occurs when the fetus passes meconium in utero (often due to fetal distress/hypoxia) and subsequently aspirates it into the lungs. This leads to a triad of airway obstruction (ball-valve effect), chemical pneumonitis, and surfactant inactivation. While Transient Tachypnea of the Newborn (TTN) is a frequent cause of mild distress, MAS remains the leading pathological cause of significant respiratory distress in the immediate postnatal period for mature infants. **Analysis of Incorrect Options:** * **Neonatal Sepsis:** While a major cause of morbidity, it usually presents with systemic signs (lethargy, poor feeding, temperature instability) alongside respiratory symptoms. It is less common as a primary cause of immediate respiratory distress compared to MAS. * **Bacterial Pneumonia:** Often overlaps with sepsis (especially Group B Streptococcus). While it causes distress, the incidence is lower than MAS in the first 24 hours. * **Air Embolism:** This is an extremely rare iatrogenic complication (e.g., from umbilical venous catheterization) and is not a standard cause of neonatal respiratory distress. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray Findings in MAS:** Characterized by "patchy opacities" (atelectasis) alternating with areas of hyperinflation (emphysema) and a "snowstorm appearance." * **Risk Factors:** Post-term pregnancy (>42 weeks) and Fetal Growth Restriction (FGR). * **Complication:** MAS is the most common condition associated with **Persistent Pulmonary Hypertension of the Newborn (PPHN)**. * **Management:** If the baby is non-vigorous, the current NRP guidelines recommend routine resuscitation (PPV) rather than routine endotracheal suctioning.

Question 152: What is the commonest indication for liver transplantation in infants?

A. Alcoholic cirrhosis
B. Biliary cirrhosis
C. Primary hemochromatosis
D. Biliary atresia (Correct Answer)

Explanation: **Explanation:** **Biliary Atresia** is the correct answer as it is the **most common indication for liver transplantation in the pediatric age group**, accounting for approximately 40–50% of all pediatric transplants. It is a progressive fibro-inflammatory obliteration of the extrahepatic biliary tree, leading to cholestasis, biliary cirrhosis, and eventually liver failure. While the initial surgical intervention is the **Kasai procedure** (hepatoportoenterostomy), a significant majority of these infants eventually require a liver transplant due to failed drainage or progressive cirrhosis. **Analysis of Incorrect Options:** * **Alcoholic Cirrhosis:** This is a leading indication for liver transplantation in **adults**, but it is virtually non-existent in the infant population. * **Biliary Cirrhosis:** This is a pathological state (secondary to chronic biliary obstruction) rather than a primary diagnosis. While Biliary Atresia leads to biliary cirrhosis, the specific disease entity remains the primary indication. * **Primary Hemochromatosis:** This is a genetic disorder of iron overload that typically manifests in adulthood. While "Neonatal Hemochromatosis" (now known as Gestational Alloimmune Liver Disease) exists and can require transplantation, it is much rarer than Biliary Atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Biliary Atresia:** Jaundice (beyond 2 weeks of age), acholic (clay-colored) stools, and hepatomegaly. * **Gold Standard Diagnosis:** Intraoperative Cholangiogram (IOC). * **Best Prognosis:** The Kasai procedure is most successful if performed within the first **60 days of life**. * **Most common indication for transplant in adults:** NASH/NAFLD and Alcoholic Liver Disease.

Question 153: What is the use of Ballard's scoring system in newborn babies?

A. Assessment of gestational age (Correct Answer)
B. Assessment of birth weight
C. Prediction of neonatal death
D. Screening for sepsis

Explanation: **Explanation:** The **Ballard Scoring System** (specifically the New Ballard Score) is a clinical tool used to estimate the **gestational age** of a newborn. It is particularly useful when the mother’s Last Menstrual Period (LMP) is unknown or when there is a discrepancy between the dates and the clinical appearance of the baby. **Why Option A is Correct:** The system evaluates two main components: 1. **Neuromuscular Maturity:** Assesses muscle tone and neurological development (e.g., Posture, Square window, Arm recoil, Popliteal angle, Scarf sign, Heel to ear). 2. **Physical Maturity:** Assesses anatomical features that change with gestation (e.g., Skin texture, Lanugo, Plantar surface, Breast bud, Eye/Ear, Genitals). The combined score is plotted on a scale to determine the gestational age (from 20 to 44 weeks). **Why Other Options are Incorrect:** * **Option B:** Birth weight is measured using a weighing scale and is used to classify babies as LBW, VLBW, or ELBW, but it does not define gestational maturity. * **Option C:** Prediction of neonatal death is typically assessed using scores like **SNAP** (Score for Neonatal Acute Physiology) or **CRIB** (Clinical Risk Index for Babies). * **Option D:** Screening for sepsis involves the **Sepsis Screen** (CRP, TLC, ANC, I/T ratio, ESR) and blood cultures. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** The New Ballard Score is most accurate when performed within **24 hours** of birth (can be used up to 96 hours). * **Range:** The New Ballard Score can assess extremely premature neonates (down to **20 weeks**). * **Key Indicator:** The **Plantar creases** are one of the most reliable physical signs; they appear anteriorly at 32 weeks and cover the entire sole by term.

Question 154: A 32-week premature infant weighing 900gm is on the third day of life with a serum bilirubin level of 13 mg%. What is the treatment of choice?

A. Exchange transfusion (Correct Answer)
B. Phototherapy
C. Wait and watch therapy
D. Pharmacologic therapy

Explanation: **Explanation:** The management of neonatal hyperbilirubinemia in preterm infants depends on birth weight, gestational age, and postnatal age. For a **900g (VLBW)** infant on the **third day of life**, a serum bilirubin of **13 mg/dL** is critically high and meets the threshold for an exchange transfusion. **1. Why Exchange Transfusion is correct:** In extremely low birth weight (ELBW) and very low birth weight (VLBW) infants, the blood-brain barrier is immature, increasing the risk of bilirubin encephalopathy (kernicterus) at much lower levels than in term infants. According to standard guidelines (like those from the AAP or AIIMS), for an infant <1000g, the threshold for **Phototherapy** is usually **5 mg/dL**, and the threshold for **Exchange Transfusion** is **10-12 mg/dL**. Since 13 mg/dL exceeds this limit, immediate exchange transfusion is required to prevent neurotoxicity. **2. Why other options are incorrect:** * **Phototherapy:** While this infant certainly needs phototherapy, it is insufficient at this level. Phototherapy is a preventive measure; once bilirubin reaches exchange thresholds, it is considered a medical emergency. * **Wait and watch:** This is dangerous. Delaying treatment in a 900g infant with high bilirubin leads to permanent neurological damage. * **Pharmacologic therapy:** Drugs like Phenobarbitone take 48–72 hours to act and are not used for acute management of high bilirubin levels. **Clinical Pearls for NEET-PG:** * **Rule of Thumb for Exchange Transfusion in Preterms:** A common clinical guide is to perform an exchange transfusion when the bilirubin level (in mg/dL) exceeds **1% of the birth weight in grams** (e.g., for 1000g, threshold is 10 mg/dL). * **Double Volume Exchange Transfusion (DVET):** Uses 160 ml/kg of blood; it removes about 85% of sensitized RBCs and 50% of bilirubin. * **Most common cause** of early jaundice (<24 hours) is ABO or Rh incompatibility.

Question 155: For a neonate at 48 hours of birth with a history of non-passage of meconium, what is the next step in evaluation?

A. Sweat chloride level
B. CFTR mutation analysis
C. Lower GI study (Correct Answer)
D. Manometry

Explanation: **Explanation:** The failure to pass meconium within the first 24–48 hours of life is a clinical red flag, most commonly associated with **Hirschsprung Disease (HD)** or **Meconium Ileus (MI)**. **Why Lower GI Study is the Correct Next Step:** A **Contrast Enema (Lower GI study)** is the initial diagnostic imaging of choice. It serves two critical purposes: 1. **Diagnostic:** It helps differentiate between HD (showing a transition zone with a narrow distal segment and dilated proximal colon) and MI (showing a microcolon with pellet-like meconium). 2. **Therapeutic:** In cases of Meconium Ileus, a gastrografin enema can help dissolve and flush out the inspissated meconium. **Analysis of Incorrect Options:** * **A & B (Sweat Chloride & CFTR Analysis):** While Meconium Ileus is the earliest manifestation of Cystic Fibrosis (CF), these tests are not the *immediate* next step. Sweat chloride is often unreliable in the first two weeks of life due to low sweat rates, and genetic analysis is a confirmatory, not an initial, step. * **D (Manometry):** Anorectal manometry is used to look for the absence of the recto-anal inhibitory reflex (RAIR) in Hirschsprung Disease. However, it is technically difficult to perform and interpret in neonates and is usually reserved for older children or as a secondary investigation. **High-Yield Clinical Pearls for NEET-PG:** * **Normal Physiology:** 95% of full-term neonates pass meconium within 24 hours; 99% within 48 hours. * **Gold Standard:** Rectal Suction Biopsy is the gold standard for diagnosing Hirschsprung Disease (showing absence of ganglion cells and hypertrophied nerve bundles). * **X-ray Finding:** "Soap bubble appearance" (Neuhauser’s sign) in the right iliac fossa is characteristic of Meconium Ileus.

Question 156: Low birth weight baby is defined as one whose birth weight is:

A. Less than 1800 g
B. Less than 2000 g
C. Less than 2500 g (Correct Answer)
D. Less than 3000 g

Explanation: **Explanation:** The classification of birth weight is a fundamental concept in neonatology, standardized by the World Health Organization (WHO) to identify infants at higher risk for morbidity and mortality. **1. Why Option C is Correct:** A **Low Birth Weight (LBW)** baby is defined as any neonate with a birth weight of **less than 2500 grams (up to and including 2499 g)**, regardless of the gestational age. This threshold is clinically significant because babies below this weight have significantly higher risks of hypothermia, hypoglycemia, infection, and developmental delays. **2. Why Other Options are Incorrect:** * **Option A (<1800 g):** This does not correspond to a standard WHO category. However, babies below 1500 g are classified as **Very Low Birth Weight (VLBW)**. * **Option B (<2000 g):** While these infants require specialized care, this is not the formal cutoff for LBW. * **Option D (<3000 g):** The average birth weight for a healthy Indian neonate is approximately 2.7–2.9 kg. A weight of 2500–3000 g is considered within the normal range, though it may be on the lower side of the distribution. **3. High-Yield Clinical Pearls for NEET-PG:** * **VLBW (Very Low Birth Weight):** < 1500 grams. * **ELBW (Extremely Low Birth Weight):** < 1000 grams. * **Micropremie:** < 750 grams. * **Large for Gestational Age (LGA):** > 4000 grams (often associated with maternal diabetes). * **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR. * **Important:** LBW can be due to either **prematurity** (born before 37 weeks) or **Intrauterine Growth Restriction (IUGR)**. In India, the most common cause of LBW is IUGR due to maternal malnutrition and anemia.

Question 157: A neonate develops signs of meningitis at seven days of birth. The presence of which of the following infectious agents in the maternal genital tract can be the causative agent of this disease?

A. Neisseria gonorrhoeae
B. Chlamydia trachomatis
C. Streptococcus agalactiae (Correct Answer)
D. Haemophilus ducreyi

Explanation: **Explanation:** The clinical presentation of neonatal meningitis within the first week of life (early-onset) is most commonly due to pathogens acquired vertically from the maternal birth canal during labor. **1. Why Streptococcus agalactiae is correct:** *Streptococcus agalactiae*, also known as **Group B Streptococcus (GBS)**, is the leading cause of neonatal sepsis and meningitis worldwide. It colonizes the maternal genitourinary and gastrointestinal tracts in approximately 10–30% of pregnant women. Neonates acquire the infection through ascending spread or during passage through the birth canal, leading to pneumonia, sepsis, or meningitis. **2. Why the other options are incorrect:** * **Neisseria gonorrhoeae:** Primarily causes **Ophthalmia neonatorum** (purulent conjunctivitis) in the first 2–5 days of life. It rarely causes systemic infections like meningitis in neonates. * **Chlamydia trachomatis:** Typically causes inclusion conjunctivitis (5–14 days post-delivery) or **interstitial pneumonia** (at 4–11 weeks). It is not a standard cause of neonatal meningitis. * **Haemophilus ducreyi:** This is the causative agent of **Chancroid** (painful genital ulcers). It is not associated with vertical transmission or neonatal meningitis. **Clinical Pearls for NEET-PG:** * **Top 3 causes of Neonatal Meningitis:** 1. *Group B Streptococcus* (Most common), 2. *Escherichia coli* (K1 antigen strain), 3. *Listeria monocytogenes*. * **Early-onset Sepsis (<7 days):** Usually due to GBS or *E. coli* acquired from the birth canal. * **Late-onset Sepsis (>7 days):** Often includes nosocomial pathogens like *Staphylococcus aureus* or *Klebsiella*. * **Drug of Choice:** For GBS meningitis, the treatment is **Ampicillin + Gentamicin** (or a third-generation cephalosporin like Cefotaxime).

Question 158: Why are newborn babies prone to hypoglycemia?

A. Low body glycogen reserves (Correct Answer)
B. Impaired glucose metabolism
C. Prematurity
D. All of the above

Explanation: **Explanation:** Neonatal hypoglycemia is a common metabolic challenge because the transition from continuous transplacental glucose supply to intermittent enteral feeding requires immediate mobilization of internal stores. **Why Option A is Correct:** The primary reason newborns are prone to hypoglycemia is **low body glycogen reserves**. Glycogen is stored in the fetal liver and skeletal muscle predominantly during the **third trimester**. At birth, these stores are rapidly depleted (within 8–12 hours) to maintain normoglycemia until feeding is established. Since newborns have a high brain-to-body mass ratio, their glucose consumption rate (4–6 mg/kg/min) is significantly higher than that of adults, making them highly dependent on these limited reserves. **Analysis of Incorrect Options:** * **B. Impaired glucose metabolism:** This is incorrect because the metabolic pathways (glycogenolysis and gluconeogenesis) are generally intact in a healthy term neonate. The issue is the *quantity* of the substrate, not the *quality* of the metabolic machinery. * **C. Prematurity:** While preterm babies are indeed at higher risk for hypoglycemia, "prematurity" is a clinical state, not the underlying physiological mechanism. Prematurity leads to hypoglycemia *because* these infants miss the third-trimester peak of glycogen deposition. * **D. All of the above:** Incorrect because "impaired metabolism" is not a standard physiological feature of a normal newborn. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** In neonates, hypoglycemia is generally defined as plasma glucose **<40–45 mg/dL**. * **High-Risk Groups:** IDM (Infant of Diabetic Mother) due to hyperinsulinism, and SGA (Small for Gestational Age) due to exhausted glycogen stores. * **Clinical Feature:** The most common presentation is **asymptomatic**, but symptomatic babies may show jitters, tremors, or lethargy. * **Management:** First-line for asymptomatic is breastfeeding; for symptomatic or severe cases, a **10% Dextrose bolus (2 ml/kg)** followed by a maintenance infusion (GIR 6–8 mg/kg/min).

Question 159: The most common cause of vaginal bleeding in a neonate is:

A. Sarcoma botryoides
B. Birth trauma
C. Bleeding disorder
D. Hormone withdrawal (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Hormone Withdrawal** **Medical Concept:** The most common cause of vaginal bleeding in a newborn female is **physiological neonatal withdrawal bleeding** (sometimes called "pseudomenstruation"). During pregnancy, high levels of maternal estrogens cross the placenta and stimulate the growth of the fetal endometrial lining. Following delivery, the sudden separation from the placenta leads to a rapid drop in the neonate’s estrogen levels. This abrupt withdrawal causes the endometrial lining to shed, resulting in self-limiting vaginal bleeding, typically occurring between the **2nd and 5th day of life**. **Analysis of Incorrect Options:** * **A. Sarcoma botryoides:** This is a rare, highly malignant embryonal rhabdomyosarcoma that presents as a "grape-like" mass protruding from the vagina. While it causes bleeding, it is extremely rare in the immediate neonatal period and usually presents in toddlers. * **B. Birth trauma:** While trauma can cause localized bruising or lacerations, it is an uncommon cause of isolated vaginal bleeding unless there was significant instrumental delivery or breech extraction complications. * **C. Bleeding disorder:** Conditions like Vitamin K deficiency bleeding (VKDB) can cause mucosal hemorrhage; however, these would typically present with bleeding from multiple sites (e.g., GI tract, umbilical stump, intracranial) rather than isolated vaginal bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Reassurance:** This is a physiological phenomenon. No treatment is required; parents should be reassured that it will resolve spontaneously within a few days. * **Associated Findings:** Maternal estrogen withdrawal can also cause **neonatal breast engorgement** and "witch’s milk" (milky nipple discharge) in both male and female infants. * **Timing:** If bleeding persists beyond the first week of life or is associated with petechiae/purpura, investigate for Vitamin K deficiency or systemic coagulopathy.

Question 160: Which congenital heart disease causes death in the first week of life?

A. Ventricular Septal Defect (VSD)
B. Tetralogy of Fallot (TOF)
C. Ebstein's anomaly
D. Hypoplastic left ventricle (Correct Answer)

Explanation: **Explanation:** **Hypoplastic Left Heart Syndrome (HLHS)**, or a hypoplastic left ventricle, is a critical ductal-dependent cyanotic heart disease. In this condition, the left-sided structures (mitral valve, left ventricle, and aorta) are severely underdeveloped. 1. **Why it is the correct answer:** In HLHS, systemic circulation depends entirely on the **Ductus Arteriosus (PDA)**. During the first week of life, as the PDA begins to close physiologically, the systemic perfusion fails, leading to rapid circulatory collapse, metabolic acidosis, and death if not intervened upon (via Prostaglandin E1 infusion or surgery). It is the most common cause of death from CHD in the first week of life. 2. **Why the other options are incorrect:** * **VSD:** This is an acyanotic CHD. Symptoms of heart failure typically appear at **4–6 weeks** of life as pulmonary vascular resistance drops; it rarely causes death in the first week. * **Tetralogy of Fallot (TOF):** While a common cyanotic CHD, it usually presents with a murmur or cyanosis later in infancy. "Tet spells" and significant mortality typically occur after the neonatal period. * **Ebstein’s Anomaly:** While it can cause severe neonatal cyanosis and right heart failure, it is statistically less likely to cause immediate mortality in the first week compared to the systemic collapse seen in HLHS. **Clinical Pearls for NEET-PG:** * **Most common CHD overall:** VSD. * **Most common cyanotic CHD (overall):** TOF. * **Most common cyanotic CHD in the newborn period:** Transposition of the Great Arteries (TGA). * **Ductal-dependent lesions:** Always suspect these when a neonate presents with sudden shock/collapse following the "asymptomatic" first 24–48 hours of life.

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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