Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 301: A 2-week-old neonate presents with stridor in the prone position. What is the recommended management?

A. Oral calcium supplementation
B. Nebulization therapy
C. Observation and watchful waiting (Correct Answer)
D. Antibiotic administration

Explanation: **Explanation:** The clinical presentation describes **Laryngomalacia**, the most common cause of congenital stridor in neonates. It is characterized by an inspiratory stridor that typically worsens when the infant is supine, crying, or feeding, and notably **improves in the prone position** (due to the forward displacement of the tongue and supraglottic structures). **Why Option C is Correct:** In over 90% of cases, laryngomalacia is a self-limiting condition. As the laryngeal cartilage matures and strengthens, the stridor typically resolves spontaneously by 18–24 months of age. Therefore, **observation and watchful waiting** is the standard management for mild to moderate cases where the infant is feeding well and gaining weight. **Why Other Options are Incorrect:** * **Option A:** Calcium supplementation is used for laryngospasm due to hypocalcemic tetany, not for structural anomalies like laryngomalacia. * **Option B:** Nebulization (e.g., adrenaline or saline) is indicated for inflammatory conditions like Croup (Laryngotracheobronchitis), but it does not correct the anatomical collapse seen in laryngomalacia. * **Option C:** Antibiotics are used for infectious causes of airway obstruction (e.g., Epiglottitis or Bacterial Tracheitis), which present with fever and acute distress, unlike this neonate. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Usually clinical; definitive diagnosis is via **flexible fiberoptic laryngoscopy** (shows "omega-shaped" epiglottis and inward collapse of aryepiglottic folds). * **Surgical Indication:** **Supraglottoplasty** is only indicated in "Severe Laryngomalacia" (characterized by failure to thrive, cor pulmonale, or severe apnea). * **Association:** Frequently associated with **Gastroesophageal Reflux Disease (GERD)**, which can exacerbate the stridor.

Question 302: Which of the following findings in a 5-year-old child warrants further investigation?

A. Conjunctival hemorrhage
B. Buphthalmos (Correct Answer)
C. Erythema toxicum
D. Mongolian spots

Explanation: **Explanation:** **Buphthalmos** (Option B) is the correct answer because it is a hallmark sign of **Congenital Glaucoma**. The term literally means "ox-eye" and refers to the progressive enlargement of the globe due to increased intraocular pressure (IOP) acting on the distensible sclera and cornea of an infant. It is a medical emergency that requires surgical intervention (e.g., goniotomy or trabeculotomy) to prevent permanent blindness. Clinical features include the triad of **epiphora (tearing), photophobia, and blepharospasm**, along with corneal clouding. **Analysis of Incorrect Options:** * **Conjunctival Hemorrhage (A):** Commonly seen after vaginal delivery due to the pressure changes in the birth canal. It is a benign, self-limiting condition that resolves within 1–2 weeks without treatment. * **Erythema Toxicum (C):** A common, benign neonatal rash characterized by erythematous macules with central yellow-white wheals or pustules. It typically appears in the first 24–72 hours of life and contains **eosinophils** on smear. * **Mongolian Spots (D):** Now termed Congenital Dermal Melanocytosis, these are bluish-grey pigmented macules usually found over the lumbosacral area. They are due to arrested melanocyte migration and are benign, usually fading by early childhood. **NEET-PG High-Yield Pearls:** * **Buphthalmos** occurs because the infant's eye is elastic; in adults, high IOP does not cause globe enlargement. * **Haab Striae:** Horizontal breaks in Descemet’s membrane seen in congenital glaucoma. * **Erythema Toxicum vs. Pustular Melanosis:** Erythema toxicum contains eosinophils; Transient Neonatal Pustular Melanosis (TNPM) contains neutrophils and is present at birth.

Question 303: What is the normal Mean Corpuscular Volume (MCV) in a neonate?

A. 90-110 fL (Correct Answer)
B. 110-125 fL
C. 125-135 fL
D. 140-150 fL

Explanation: **Explanation:** The correct answer is **A. 90-110 fL**. **1. Why it is correct:** Neonatal hematology is characterized by "macrocytosis" relative to adult values. At birth, the Mean Corpuscular Volume (MCV) is significantly higher than in adults (whose normal range is 80-100 fL). In a term neonate, the normal MCV typically ranges from **90 to 110 fL** (averaging around 105 fL). This is due to the rapid erythropoiesis occurring in the intrauterine environment and the presence of a higher percentage of reticulocytes, which are larger than mature red blood cells. **2. Why the other options are incorrect:** * **Options B, C, and D:** These values (110-150 fL) are pathologically high. While MCV can occasionally reach 115-120 fL in extremely premature infants, values consistently above 110 fL in a term neonate suggest underlying pathology, such as maternal folate/B12 deficiency or certain rare congenital hemolytic anemias. **3. High-Yield Clinical Pearls for NEET-PG:** * **Physiological Trend:** The MCV is highest at birth, remains high for the first week, and then gradually declines, reaching adult levels by approximately 1 year of age. * **Hemoglobin at Birth:** Normal cord blood hemoglobin is **14–20 g/dL**. * **Reticulocyte Count:** It is high at birth (3–7%) but drops significantly within the first week of life as erythropoietin production decreases due to improved oxygenation. * **Nucleated RBCs:** It is normal to see 3–10 nucleated RBCs per 100 WBCs in a peripheral smear of a newborn; their persistence beyond 3–4 days may indicate hypoxia or hemolysis.

Question 304: A premature neonate on top feeding develops abdominal distension and bleeding per rectum. He recently recovered from an acute upper respiratory tract infection. What is the probable diagnosis?

A. Necrotizing enterocolitis (Correct Answer)
B. Volvulus
C. Meckel's diverticulum
D. Intussusception

Explanation: **Explanation:** The clinical presentation of **prematurity**, **top feeding** (formula feeding), **abdominal distension**, and **hematochezia** (bleeding per rectum) is the classic triad for **Necrotizing Enterocolitis (NEC)**. **Why Necrotizing Enterocolitis is correct:** NEC is the most common gastrointestinal emergency in neonates. Prematurity is the single greatest risk factor due to intestinal immaturity. Formula feeding (top feeding) increases risk by providing a substrate for bacterial proliferation and causing mucosal injury. The recent respiratory infection likely caused a period of hypoxia/ischemia, triggering the "diving reflex," which shunts blood away from the gut to the brain and heart, leading to intestinal ischemia and necrosis. **Why other options are incorrect:** * **Volvulus:** Typically presents with sudden-onset bilious vomiting and signs of shock. While it causes distension, the strong association with prematurity and feeding makes NEC more likely. * **Meckel’s Diverticulum:** Usually presents in older children (Rule of 2s) with painless massive rectal bleeding. It is rare in the neonatal period. * **Intussusception:** Characterized by "currant jelly stools" and paroxysmal colicky pain. It most commonly occurs between 6 months and 2 years of age; it is extremely rare in premature neonates. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic X-ray finding:** **Pneumatosis intestinalis** (gas in the bowel wall). * **Bell’s Staging:** Used to classify the severity of NEC. * **Protective factor:** Breast milk (contains IgA and bioactive factors). * **First sign on X-ray:** Dilated bowel loops; **Pneumoperitoneum** (Football sign) indicates perforation and is an indication for surgery.

Question 305: Pneumatosis intestinalis is most often seen in?

A. Neonatal necrotizing enterocolitis (Correct Answer)
B. Midgut volvulus
C. Meconium peritonitis
D. Neonatal visceral perforation

Explanation: **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 mucosal barrier is breached (due to ischemia or inflammation), allowing gas-producing bacteria to invade the intestinal wall. On an X-ray, it appears as linear or curvilinear radiolucencies following the contour of the bowel loops. **Analysis of Options:** * **A. Neonatal Necrotizing Enterocolitis (Correct):** It is the most common gastrointestinal emergency in neonates (especially preterm). Pneumatosis intestinalis is the hallmark of Bell’s Stage II (Definite NEC). * **B. Midgut Volvulus:** The characteristic X-ray finding is a "corkscrew appearance" (on contrast study) or a "double bubble" sign if associated with malrotation. While it causes ischemia, intramural gas is not a primary feature. * **C. Meconium Peritonitis:** This is a sterile chemical peritonitis due to in-utero bowel perforation. The classic radiographic finding is **intraperitoneal calcifications**. * **D. Neonatal Visceral Perforation:** This typically presents as **pneumoperitoneum** (free air under the diaphragm or the "football sign"), indicating air *outside* the bowel, rather than within the bowel wall. **NEET-PG High-Yield Pearls:** * **Pathognomonic Sign of NEC:** Pneumatosis intestinalis. * **Most common site for NEC:** Terminal ileum and proximal colon. * **Portal Venous Gas:** A sign of advanced NEC (Bell’s Stage III) and carries a poor prognosis. * **First sign of NEC on X-ray:** Non-specific generalized bowel distension (ileus). * **Absolute indication for surgery in NEC:** Pneumoperitoneum (evidence of perforation).

Question 306: As per the latest resuscitation guidelines, umbilical cord clamping must be delayed for at least how long in preterm infants?

A. 20 seconds
B. 30 seconds (Correct Answer)
C. 40 seconds
D. 60 seconds

Explanation: **Explanation:** The current **NRP (Neonatal Resuscitation Program) 8th Edition** and **AHA/ILCOR guidelines** recommend **Delayed Cord Clamping (DCC)** for both term and preterm infants who do not require immediate resuscitation. **Why 30 seconds is correct:** For preterm infants, the guidelines specify a delay of **at least 30 to 60 seconds**. This physiological transition allows for a "placental transfusion," increasing the infant's blood volume by approximately 20–30%. In preterms, this significantly reduces the risk of intraventricular hemorrhage (IVH), necrotizing enterocolitis (NEC), and the need for blood transfusions. **Analysis of Incorrect Options:** * **A (20 seconds):** This duration is considered insufficient to allow for an adequate placental-to-fetal blood shift. * **C & D (40 and 60 seconds):** While DCC can extend up to 60 seconds (or more in some protocols), the question asks for the **minimum** duration required as per the standard definition in the latest guidelines, which is "at least 30 seconds." **High-Yield Clinical Pearls for NEET-PG:** * **Contraindications to DCC:** Placental abruption, placenta previa with bleeding, cord avulsion, or if the mother is hemodynamically unstable. * **Milking the Cord:** If DCC is not possible in preterm infants (<34 weeks), umbilical cord milking is generally **not** recommended as it is associated with an increased risk of IVH. * **Positioning:** During DCC, the infant can be placed on the mother’s abdomen or held at the level of the introitus; gravity does not significantly affect the volume of transfusion. * **Term Infants:** In term infants, DCC primarily improves iron stores and hemoglobin levels at birth.

Question 307: Asymmetric Moro's reflex in a neonate is indicative of:

A. Hypoxic-ischemic encephalopathy
B. Brain damage
C. Erb's palsy (Correct Answer)
D. Kernicterus

Explanation: **Explanation:** The **Moro reflex** is a primitive reflex normally present at birth and disappears by 3–6 months of age. It is characterized by sudden extension and abduction of the arms, followed by flexion and adduction (the "embrace" gesture). **Why Erb’s Palsy is correct:** An **asymmetric** Moro reflex occurs when one arm fails to move in coordination with the other. In **Erb’s palsy** (injury to the C5–C6 nerve roots of the brachial plexus), the affected arm is held in the "waiter's tip" position (adducted and internally rotated). Because the muscles of the shoulder and upper arm are paralyzed, the infant cannot abduct or externally rotate the affected limb during the reflex, leading to an asymmetric response. Other causes of asymmetry include fractured clavicle or humerus. **Why other options are incorrect:** * **Hypoxic-ischemic encephalopathy (HIE) & Brain damage:** These typically result in a **symmetric** response. Depending on the severity, the Moro reflex will be either exaggerated (early stage), depressed, or entirely absent (late stage/severe damage) on both sides. * **Kernicterus:** This condition (bilirubin-induced neurological damage) generally causes a **depressed or absent** Moro reflex symmetrically, often accompanied by hypertonicity or opisthotonus. **NEET-PG High-Yield Pearls:** * **Asymmetric Moro:** Think Erb’s Palsy, Clavicle fracture, or Hemiplegia. * **Absent Moro:** Suggests significant CNS depression or severe HIE. * **Persistence beyond 6 months:** Highly suggestive of cerebral palsy. * **Erb’s Palsy (C5-C6):** Most common brachial plexus injury; involves loss of "Abduction, Flexion, and External rotation."

Question 308: Which of the following is NOT a risk factor for neonatal hyperbilirubinemia?

A. Male gender
B. Prematurity
C. Cephalhematoma
D. Increased feeding (calorie) intake (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Increased feeding (calorie) intake.** In neonates, bilirubin is cleared through the liver and excreted via the gut. **Increased feeding** (especially breastfeeding) promotes intestinal motility and the passage of meconium, which reduces **enterohepatic circulation** (the reabsorption of bilirubin from the gut back into the bloodstream). Conversely, **inadequate feeding** or caloric deprivation leads to dehydration, delayed meconium passage, and increased enterohepatic circulation, which are major risk factors for jaundice. **Analysis of Incorrect Options:** * **Male gender:** Epidemiological studies consistently show that male infants have a higher risk of developing significant hyperbilirubinemia compared to females, likely due to genetic factors and a higher incidence of G6PD deficiency. * **Prematurity:** Preterm infants have immature hepatic conjugation enzymes (UDP-glucuronosyltransferase) and increased red cell turnover, making them highly susceptible to jaundice. * **Cephalhematoma:** This is a collection of blood under the periosteum. As the trapped red blood cells break down (extravascular hemolysis), they release a large load of bilirubin that can overwhelm the neonatal liver. **NEET-PG High-Yield Pearls:** * **Breast milk jaundice:** Occurs late (after day 7); caused by substances in milk (like beta-glucuronidase) that increase enterohepatic circulation. * **Breastfeeding jaundice:** Occurs early (first week); caused by **poor intake** and dehydration. * **Kramer’s Rule:** Used for clinical assessment of jaundice (starts from face and moves to feet). * **Bhutani Nomogram:** The gold standard for predicting the risk of severe hyperbilirubinemia based on hour-specific serum bilirubin levels.

Question 309: Children of parents with which of the following blood group combinations have the highest risk of erythroblastosis fetalis?

A. Rh+ father and Rh+ mother
B. Rh+ father and Rh- mother (Correct Answer)
C. Rh- father and Rh+ mother
D. Rh- father and Rh- mother

Explanation: **Explanation:** **Erythroblastosis fetalis** (Hemolytic Disease of the Newborn) occurs due to **Rh isoimmunization**. This condition arises when there is an incompatibility between the maternal and fetal blood groups, specifically involving the D antigen. 1. **Why Option B is Correct:** For erythroblastosis fetalis to occur, the **mother must be Rh-negative** and the **fetus must be Rh-positive**. Since the Rh-positive trait is dominant, a fetus can only be Rh-positive if the **father is Rh-positive**. During pregnancy or delivery, fetal Rh-positive RBCs enter the maternal circulation, causing the mother to produce anti-D antibodies (IgG). In subsequent pregnancies, these IgG antibodies cross the placenta and attack fetal RBCs, leading to hemolysis, anemia, and hydrops fetalis. 2. **Why Other Options are Incorrect:** * **Options A & C:** If the mother is **Rh-positive**, she already possesses the D antigen. Her immune system recognizes it as "self" and will not produce anti-D antibodies, regardless of the father's Rh status. * **Option D:** If both parents are **Rh-negative**, the fetus will inevitably be Rh-negative. Since there is no foreign D antigen involved, no sensitization occurs. **High-Yield Clinical Pearls for NEET-PG:** * **First Pregnancy:** Usually spared because sensitization occurs during the delivery of the first Rh-positive child. * **Prophylaxis:** Administer **Anti-D Gamma Globulin (RhoGAM)** to Rh-negative mothers at 28 weeks of gestation and within 72 hours of delivery (if the baby is Rh-positive). * **Diagnosis:** The **Indirect Coombs Test (ICT)** is used to detect antibodies in the mother's serum, while the **Direct Coombs Test (DCT)** is used to detect sensitized RBCs in the newborn. * **Most common cause of HDN:** ABO incompatibility (usually milder); **Most severe cause:** Rh incompatibility.

Question 310: What is the APGAR score for a newborn with the following findings: Heart Rate 120/min, Respiratory Rate 40/min, strong respiratory efforts, peripheral cyanosis, grimace during suctioning, slightly flexed posture, and no active limb movements?

A. 6
B. 7 (Correct Answer)
C. 8
D. 9

Explanation: The APGAR score is a rapid assessment tool used at 1 and 5 minutes after birth to evaluate a newborn's clinical status. It assesses five parameters, each scored from 0 to 2. ### **Breakdown of the Score for this Case:** 1. **Heart Rate (120/min):** >100 bpm = **2 points** 2. **Respiratory Effort:** Strong respiratory effort (even with a rate of 40/min) = **2 points** 3. **Muscle Tone:** Slightly flexed posture with no active limb movements = **1 point** (Active movement would be 2; flaccid would be 0). 4. **Reflex Irritability (Grimace during suctioning):** Grimace only = **1 point** (Cough/sneeze/cry would be 2; no response would be 0). 5. **Color:** Peripheral cyanosis (Acrocyanosis) = **1 point** (Completely pink would be 2; central cyanosis/pale would be 0). **Total Score: 2 + 2 + 1 + 1 + 1 = 7** ### **Why other options are incorrect:** * **Option A (6):** This underestimates the score by missing a point in either heart rate or respiratory effort, both of which are optimal here. * **Options C & D (8 or 9):** These scores would require the infant to be completely pink (2 points) and have active limb movements or a more vigorous reflex response (cough/sneeze). ### **NEET-PG High-Yield Pearls:** * **Order of disappearance:** In neonatal depression, the signs disappear in this order: Color → Respiration → Muscle Tone → Reflex Irritability → Heart Rate. * **Order of recovery:** This is the reverse of disappearance; Heart Rate is the first to improve. * **Interpretation:** 7–10 is Normal; 4–6 is Mildly/Moderately depressed; 0–3 is Severely depressed. * **Crucial Note:** APGAR score is **not** used to decide the need for resuscitation; resuscitation must begin before the 1-minute score if the infant is apneic or gasping.

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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