Neonatology — MCQs

A newborn presents with early onset dyspnea with chest retractions, expiratory grunting, and cyanosis following an uneventful normal preterm labor. On examination, no cardiac murmurs are heard and the lungs appear clear. A plain X-ray shows prominent pulmonary vascular markings and fluid lines in the fissures. The cyanosis improves with minimal oxygen. What is the most probable diagnosis?

Q82Medium

Which of the following statements about the ductus arteriosus is true?

Q83Easy

Mastitis neonatorum in a newborn is best treated with ___________?

Q84Medium

A neonate weighing 1.3 kg is born at 32 weeks' gestation and was transferred to the nursery for prematurity. After 1 hour, the infant is tachypneic with a heart rate of 150 bpm, respiratory rate of 76/min, temperature of 95°F, and oxygen saturation of 98%. The lungs are clear with bilateral breath sounds, there is no murmur, and the chest x-ray is normal. What is the next step in the management of this neonate?

Q85Easy

Crede's method refers to the instillation of which of the following substances?

Q86Medium

A neonate born to a mother with no prenatal care presents with severe oligohydramnios noted on a biophysical profile during active labor. What condition should this infant be carefully evaluated for?

Q87Medium

Hypoglycemia in a newborn is seen in which of the following conditions?

Q88Easy

Jaundice in a newborn, observed after 48 hours of birth, with bilirubin levels not exceeding 5 mg%, is characteristic of which condition?

Q89Medium

Which of the following are normal findings in a term neonate, EXCEPT?

Q90Medium

A primigravida mother presents with her 3-week-old male infant, who has a noisy breathing sound. The infant is afebrile, sleeping well, and feeding well. On clinical examination, the infant is normal. What is the appropriate management protocol?

Neonatology Indian Medical PG Practice Questions and MCQs

Question 81: A newborn presents with early onset dyspnea with chest retractions, expiratory grunting, and cyanosis following an uneventful normal preterm labor. On examination, no cardiac murmurs are heard and the lungs appear clear. A plain X-ray shows prominent pulmonary vascular markings and fluid lines in the fissures. The cyanosis improves with minimal oxygen. What is the most probable diagnosis?

A. Meconium aspiration syndrome
B. Fetal aspiration syndrome
C. Transient tachypnea of the newborn (Correct Answer)
D. Hyaline membrane disease

Explanation: ### Explanation **Correct Option: C. Transient Tachypnea of the Newborn (TTN)** **1. Why it is correct:** Transient Tachypnea of the Newborn (TTN), also known as "Wet Lung," is caused by **delayed resorption of fetal lung fluid** by the pulmonary lymphatic system. * **Clinical Presentation:** It typically presents in late preterm or term neonates shortly after birth with respiratory distress (tachypnea, grunting, retractions). * **Radiological Features:** The classic X-ray findings described—**prominent vascular markings (sunburst appearance)**, **fluid in the horizontal fissures**, and occasionally pleural effusions—are pathognomonic. * **Oxygen Response:** Unlike cyanotic heart disease or severe RDS, TTN typically shows rapid improvement with minimal supplemental oxygen (low FiO2). **2. Why the other options are incorrect:** * **A & B (Meconium/Fetal Aspiration):** These usually occur in post-term or term infants with a history of fetal distress or meconium-stained liquor. X-rays show patchy opacities and hyperinflation, not clear lungs with fluid lines. * **D (Hyaline Membrane Disease/RDS):** While common in preterms, the X-ray classically shows a **"ground-glass" appearance** with **air bronchograms** and low lung volumes, rather than prominent vascular markings and fluid lines. **3. NEET-PG High-Yield Pearls:** * **Risk Factors:** Cesarean section (lack of "thoracic squeeze"), maternal sedation, and maternal asthma. * **Management:** Supportive care (oxygen/CPAP). It is self-limiting and usually resolves within 24–72 hours. * **Differentiating Feature:** If the respiratory distress lasts >72 hours, reconsider the diagnosis (e.g., pneumonia or RDS). * **X-ray Buzzword:** "Starry sky" or "Sunburst" appearance of perihilar streaks.

Question 82: Which of the following statements about the ductus arteriosus is true?

A. It undergoes anatomic closure within 24 hours of birth.
B. It connects the aorta to the pulmonary vein.
C. It is induced to close by high levels of prostaglandins.
D. Its patency may cause a machinery murmur. (Correct Answer)

Explanation: **Explanation:** The **Ductus Arteriosus (DA)** is a vital fetal vascular structure connecting the pulmonary artery to the descending aorta, bypassing the non-functional fetal lungs. **Why Option D is Correct:** In Patent Ductus Arteriosus (PDA), blood flows from the high-pressure aorta to the lower-pressure pulmonary artery throughout the cardiac cycle. This continuous pressure gradient results in a **continuous "machinery" murmur**, heard loudest at the left infraclavicular area (Gibson’s murmur). **Analysis of Incorrect Options:** * **Option A:** Functional closure occurs within 10–15 hours of birth due to smooth muscle contraction. However, **anatomic closure** (fibrosis into the ligamentum arteriosum) takes much longer, typically **2 to 3 weeks**. * **Option B:** The DA connects the **pulmonary artery** (specifically the bifurcation or left branch) to the **descending aorta**, not the pulmonary vein. * **Option C:** Prostaglandins (PGE1 and PGE2) maintain patency. Closure is actually induced by **decreased prostaglandin levels** and the **rise in arterial oxygen tension (PaO2)** after the first breath. **High-Yield NEET-PG Pearls:** * **Drug of Choice for Closure:** Intravenous **Indomethacin** or **Ibuprofen** (NSAIDs that inhibit prostaglandin synthesis). Paracetamol is also used. * **Maintaining Patency:** In cyanotic heart diseases (e.g., Transposition of Great Arteries), **Alprostadil (PGE1)** is administered to keep the ductus open. * **Associated Infection:** Maternal **Rubella** infection during pregnancy is strongly associated with PDA in the newborn.

Question 83: Mastitis neonatorum in a newborn is best treated with ___________?

A. Oral erythromycin
B. Local fermentation
C. Evacuation by gentle massage
D. Conservative management (Correct Answer)

Explanation: **Explanation:** **Mastitis neonatorum** (physiological breast engorgement) is a common, benign condition seen in both male and female newborns during the first week of life. **Why Conservative Management is Correct:** The condition is caused by the **transplacental passage of maternal hormones** (estrogen and progesterone) into the fetal circulation. These hormones stimulate the neonatal mammary tissue. As the hormone levels drop after birth, the newborn’s pituitary gland releases prolactin, occasionally leading to the secretion of "witch’s milk." Since this is a physiological process, it is self-limiting and typically resolves spontaneously within 2–4 weeks as maternal hormones are cleared from the infant's system. No active intervention is required. **Why Other Options are Incorrect:** * **Oral erythromycin:** Antibiotics are only indicated if there is secondary bacterial infection (Neonatal Mastitis/Abscess), characterized by unilateral erythema, warmth, and tenderness. * **Local fermentation/warm compresses:** These are unnecessary for physiological engorgement and may cause skin irritation. * **Evacuation by gentle massage:** This is **strictly contraindicated**. Manipulating or squeezing the breast tissue can lead to trauma, introduce infection (Staph. aureus), and result in a breast abscess or permanent damage to the breast bud. **Clinical Pearls for NEET-PG:** * **Incidence:** Occurs in roughly 6%–9% of full-term newborns; rare in preterm infants. * **Key Sign:** Usually bilateral. If unilateral with signs of inflammation, suspect **Neonatal Mastitis** (most common organism: *Staphylococcus aureus*). * **Management of Abscess:** If an abscess forms, the treatment of choice is **Incision and Drainage (I&D)** plus systemic antibiotics. * **Warning:** Always advise parents against squeezing the breast, as it is the most common cause of progression from physiological engorgement to a pyogenic abscess.

Question 84: A neonate weighing 1.3 kg is born at 32 weeks' gestation and was transferred to the nursery for prematurity. After 1 hour, the infant is tachypneic with a heart rate of 150 bpm, respiratory rate of 76/min, temperature of 95°F, and oxygen saturation of 98%. The lungs are clear with bilateral breath sounds, there is no murmur, and the chest x-ray is normal. What is the next step in the management of this neonate?

A. Administer intravenously 5ml of D50.
B. Obtain a complete blood count and differential.
C. Perform a lumbar puncture.
D. Place the infant under a warmer. (Correct Answer)

Explanation: **Explanation:** The neonate in this scenario is presenting with **Cold Stress**. The key clinical finding is a temperature of **95°F (35°C)**, which is significantly below the normal neonatal range (97.7°F to 99.5°F). In neonates, especially preterm infants (32 weeks, 1.3 kg), hypothermia triggers a compensatory increase in metabolic rate to produce heat via **non-shivering thermogenesis** (metabolism of brown fat). This increased metabolic demand leads to **tachypnea** (RR 76/min) and tachycardia (HR 150 bpm) as the body attempts to deliver more oxygen and glucose to tissues. Since the chest X-ray and oxygen saturation are normal, primary pulmonary or cardiac causes are unlikely. The immediate priority is to restore the **Neutral Thermal Environment (NTE)** to decrease metabolic demand. **Analysis of Incorrect Options:** * **Option A:** While hypothermia can lead to hypoglycemia, D50 is never used in neonates due to the risk of rebound hyperinsulinemia and intracranial hemorrhage; D10W is the fluid of choice. * **Option B & C:** While sepsis can cause temperature instability, the infant has a clear trigger (prematurity/environmental exposure) and a normal CXR. Warming should precede or occur simultaneously with a sepsis workup if the infant remains unstable. **NEET-PG High-Yield Pearls:** * **Brown Fat:** Located in the interscapular area, neck, and axilla; it is the primary source of heat in neonates. * **Modes of Heat Loss:** Radiation (most common), Evaporation (highest immediately after birth), Convection, and Conduction. * **Cold Stress Triad:** Hypoxemia, Hypoglycemia, and Metabolic Acidosis. * **Management:** Always prioritize the "Warm Chain" to prevent morbidity in preterm infants.

Question 85: Crede's method refers to the instillation of which of the following substances?

A. 1% silver nitrate (Correct Answer)
B. 1% methyl cellulose
C. 1% chloramphenicol
D. 1% saline wash

Explanation: **Explanation:** **Crede’s Method** (specifically Crede’s prophylaxis) refers to the practice of instilling **1% Silver Nitrate** solution into the eyes of newborns immediately after birth. 1. **Why Option A is Correct:** Introduced by Karl Credé in 1881, this method was designed to prevent **Ophthalmia Neonatorum** (neonatal conjunctivitis), specifically caused by *Neisseria gonorrhoeae*. Silver nitrate acts as a potent germicide by precipitating bacterial proteins. While highly effective against Gonococcus, it is notorious for causing **chemical conjunctivitis** (redness and discharge within 24 hours), which is why it has largely been replaced by erythromycin or tetracycline ointments in modern practice. 2. **Why Other Options are Incorrect:** * **Option B (1% Methyl cellulose):** This is a lubricant used for dry eyes or during ophthalmic procedures; it has no antimicrobial properties. * **Option C (1% Chloramphenicol):** While an antibiotic, it is not the classic agent associated with "Crede's Method." Modern prophylaxis uses 0.5% Erythromycin or 1% Tetracycline. * **Option D (1% Saline wash):** Saline is used for irrigation but does not provide the necessary chemical prophylaxis against birth canal pathogens. **High-Yield Clinical Pearls for NEET-PG:** * **Ophthalmia Neonatorum Timing:** * *Chemical (Silver Nitrate):* Within 24 hours. * *Neisseria gonorrhoeae:* 2–5 days (Most severe, risk of corneal perforation). * *Chlamydia trachomatis:* 5–14 days (Most common cause overall). * **Note:** Silver nitrate is **not effective** against *Chlamydia*. * **Crede’s Maneuver (Distinction):** Do not confuse Crede's *prophylaxis* (eyes) with Crede's *maneuver* (manual pressure on the lower abdomen to empty a neurogenic bladder).

Question 86: A neonate born to a mother with no prenatal care presents with severe oligohydramnios noted on a biophysical profile during active labor. What condition should this infant be carefully evaluated for?

A. Anencephaly
B. Trisomy 18
C. Renal agenesis (Correct Answer)
D. Duodenal atresia

Explanation: **Explanation:** **Correct Option: C (Renal agenesis)** The underlying concept here is the **Potter sequence**. In utero, fetal urine is the primary contributor to amniotic fluid volume starting from the second trimester. Bilateral renal agenesis (or severe renal dysplasia) leads to a lack of fetal urine production, resulting in **severe oligohydramnios**. This lack of fluid causes mechanical compression of the fetus, leading to the classic "Potter facies" (low-set ears, flattened nose, recessed chin) and, most critically, **pulmonary hypoplasia**, which is the leading cause of death in these neonates. **Analysis of Incorrect Options:** * **A. Anencephaly:** Neural tube defects like anencephaly are associated with **polyhydramnios**, not oligohydramnios. This occurs because the fetus lacks the swallowing reflex or has exposed neural tissue causing transudation of fluid. * **B. Trisomy 18 (Edwards Syndrome):** While associated with various anomalies, it is more frequently linked to **polyhydramnios** due to impaired swallowing or associated GI malformations. * **D. Duodenal atresia:** This condition prevents the fetus from swallowing and absorbing amniotic fluid in the distal GI tract, leading to **polyhydramnios**. It is classically associated with the "double bubble" sign and Down Syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Oligohydramnios (AFI < 5 cm):** Think of the "DRIP" mnemonic—**D**emise, **R**enal abnormalities, **I**nsufficiency (Placental), **P**rom (Premature Rupture of Membranes). * **Potter Sequence:** The primary defect is renal; the secondary effects are pulmonary hypoplasia and limb deformities. * **Polyhydramnios (AFI > 25 cm):** Think of CNS issues (no swallowing) or GI obstructions (Atresias).

Question 87: Hypoglycemia in a newborn is seen in which of the following conditions?

A. Intrauterine growth restriction (IUGR) (Correct Answer)
B. Mother with hypothyroidism
C. Rh incompatibility
D. Maternal hyperthyroidism

Explanation: **Explanation:** **1. Why IUGR is the Correct Answer:** Neonatal hypoglycemia is defined as a blood glucose level **<40 mg/dL**. In Intrauterine Growth Restriction (IUGR) or Small for Gestational Age (SGA) infants, hypoglycemia occurs due to **decreased glycogen stores** in the liver and **diminished subcutaneous fat** (reduced precursors for gluconeogenesis). These infants have a high brain-to-body weight ratio, leading to increased glucose consumption relative to their limited supply. **2. Analysis of Incorrect Options:** * **Mother with Hypothyroidism (B):** This is not typically associated with neonatal hypoglycemia. Maternal hypothyroidism is more commonly linked to congenital hypothyroidism or neurodevelopmental delays in the offspring. * **Rh Incompatibility (C):** While severe Rh isoimmunization can lead to hyperinsulinism (due to islet cell hyperplasia), it is a less common cause compared to IUGR. In the context of standard NEET-PG questions, IUGR and Infants of Diabetic Mothers (IDM) are the primary associations for hypoglycemia. * **Maternal Hyperthyroidism (D):** This is generally associated with tachycardia, irritability, or intrauterine growth restriction, but it is not a direct, classic cause of neonatal hypoglycemia. **3. Clinical Pearls for NEET-PG:** * **High-Yield Causes of Hypoglycemia:** 1. **Decreased Stores:** IUGR, Prematurity. 2. **Hyperinsulinism:** Infant of Diabetic Mother (IDM), Beckwith-Wiedemann Syndrome, Nesidioblastosis. 3. **Increased Utilization:** Sepsis, Birth Asphyxia, Hypothermia. * **Symptomatic Threshold:** Always treat if glucose is <40 mg/dL. * **Management:** Asymptomatic cases are managed with early feeding; symptomatic cases require an **IV bolus of 10% Dextrose (2 ml/kg)** followed by a continuous infusion (GIR 6–8 mg/kg/min).

Question 88: Jaundice in a newborn, observed after 48 hours of birth, with bilirubin levels not exceeding 5 mg%, is characteristic of which condition?

A. ABO incompatibility
B. Hemolytic disease of the newborn
C. Neonatal hepatitis syndrome
D. Physiological jaundice (Correct Answer)

Explanation: ### Explanation **Physiological Jaundice** is the most common cause of neonatal jaundice. It occurs due to a transient imbalance between bilirubin production (increased RBC turnover) and excretion (immature hepatic glucuronyltransferase enzyme). **Why Option D is Correct:** Physiological jaundice is characterized by specific criteria: 1. **Onset:** Appears **after 24 hours** of life (typically peaking between days 3–5). 2. **Intensity:** Bilirubin levels usually rise by less than 5 mg/dL per day and typically do not exceed 15 mg/dL in term infants. 3. **Duration:** It usually disappears by the 10th day in term neonates. The scenario describes jaundice appearing after 48 hours with low intensity (5 mg%), which fits these criteria perfectly. **Why Other Options are Incorrect:** * **A & B (ABO Incompatibility/Hemolytic Disease):** These are causes of **pathological jaundice**. They typically manifest within the **first 24 hours** of birth due to rapid immune-mediated hemolysis, often leading to much higher bilirubin levels (>5 mg/dL/day). * **C (Neonatal Hepatitis Syndrome):** This presents as **conjugated hyperbilirubinemia** (cholestasis), usually appearing later (2–4 weeks of age) with dark urine and pale stools, rather than simple indirect hyperbilirubinemia in the first 48 hours. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any jaundice appearing in the **first 24 hours** of life is **Pathological** until proven otherwise. * **Kramer’s Rule:** Used for clinical assessment of jaundice progression (Cephalo-caudal progression). * **Treatment Threshold:** Physiological jaundice requires no treatment other than frequent breastfeeding. Phototherapy is initiated only if levels cross age-specific thresholds on the Bhutani Nomogram.

Question 89: Which of the following are normal findings in a term neonate, EXCEPT?

A. Mongolian spots
B. Erythema toxicum
C. Subconjunctival hemorrhages
D. Erythema nodosum (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Erythema nodosum**. **Why Erythema Nodosum is the correct answer:** Erythema nodosum is a form of panniculitis (inflammation of subcutaneous fat) characterized by tender, red nodules, typically on the shins. It is **not** a normal finding in neonates; rather, it is a hypersensitivity reaction to various triggers such as infections (Streptococcal, TB, fungal), drugs (sulfonamides), or systemic diseases (Sarcoidosis, IBD). In neonates, a similar-looking but distinct condition is *Subcutaneous Fat Necrosis*, which is also pathological. **Analysis of Incorrect Options (Normal Findings):** * **A. Mongolian spots:** These are congenital dermal melanocytosis appearing as blue-grey patches, usually over the lumbosacral area. They are common in Asian and dark-skinned infants and typically fade by early childhood. * **B. Erythema toxicum (neonatorum):** A benign, self-limiting rash appearing in 50% of term neonates within 24–48 hours. It features small papules/pustules on an erythematous base. A key diagnostic feature is the presence of **eosinophils** on a Tzanck smear. * **C. Subconjunctival hemorrhages:** These are common and result from the pressure changes and rupture of small capillaries during vaginal delivery. They are asymptomatic and resolve spontaneously within 1–2 weeks. **NEET-PG High-Yield Pearls:** * **Milium:** Tiny white papules on the nose/cheeks due to retained keratin (normal). * **Epstein pearls:** Whitish-yellow cysts on the hard palate (normal). * **Harlequin color change:** Transient deep red color on one half of the body when the infant lies on their side (normal). * **Salmon patch (Stork bite):** Capillary hemangioma on the nape of the neck or eyelids (normal).

Question 90: A primigravida mother presents with her 3-week-old male infant, who has a noisy breathing sound. The infant is afebrile, sleeping well, and feeding well. On clinical examination, the infant is normal. What is the appropriate management protocol?

A. Begin IV antibiotics
B. Reassure and give saline nasal drops (Correct Answer)
C. Give racemic epinephrine
D. Order for a chest X-ray

Explanation: ### Explanation The clinical presentation describes a classic case of **Neonatal Snuffles** (Physiological Nasal Congestion). In a 3-week-old infant who is otherwise healthy, feeding well, and gaining weight, noisy breathing is most commonly due to the narrow nasal passages of a neonate being partially obstructed by dried secretions or milk reflux. **Why Option B is Correct:** The absence of fever, respiratory distress (retractions/tachypnea), or feeding difficulties points toward a benign, physiological cause rather than an infection or structural anomaly. **Saline nasal drops** help liquefy mucus, and **reassurance** is the mainstay of management as the condition is self-limiting and improves as the nasal passages grow. **Why Other Options are Incorrect:** * **Option A (IV Antibiotics):** Incorrect because the infant is afebrile and clinically stable; there are no signs of neonatal sepsis or pneumonia. * **Option C (Racemic Epinephrine):** Used for upper airway obstruction like Croup (Laryngotracheobronchitis). This infant has no stridor or respiratory distress. * **Option D (Chest X-ray):** Unnecessary exposure to radiation. A CXR is indicated for lower respiratory tract pathology, which is ruled out by the normal clinical examination. **NEET-PG High-Yield Pearls:** * **Stridor vs. Snuffles:** If the noise were inspiratory and worsened when supine, consider **Laryngomalacia** (the most common cause of congenital stridor). * **Choanal Atresia:** If the infant had cyclical cyanosis (blue when quiet, pink when crying), suspect bilateral choanal atresia. * **Red Flags:** Always check for "sucking-in" (retractions), nasal flaring, or poor feeding before diagnosing simple snuffles. If these are absent, conservative management is the rule.

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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