Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 531: What is a long-term complication of bronchopulmonary dysplasia?

A. Decreased functional residual capacity
B. Small airway disease
C. Large airway disease (Correct Answer)
D. Interstitial lung disease

Explanation: **Explanation:** Bronchopulmonary Dysplasia (BPD) is a chronic lung disease of prematurity characterized by arrested alveolar development and vascular remodeling. While BPD primarily affects the lung parenchyma, it is significantly associated with structural and functional abnormalities of the **large airways**. **Why Large Airway Disease is Correct:** Infants with BPD frequently develop **tracheomalacia and bronchomalacia** (weakness of the tracheal/bronchial cartilage). This occurs due to prolonged endotracheal intubation, high-pressure mechanical ventilation, and chronic inflammation, which weaken the airway walls. This leads to dynamic airway collapse, causing persistent wheezing, stridor, and difficulty weaning from respiratory support. **Analysis of Incorrect Options:** * **A. Decreased functional residual capacity (FRC):** In BPD, there is typically **increased** FRC or hyperinflation due to air trapping caused by small airway obstruction and loss of elastic recoil. * **B. Small airway disease:** While BPD involves the distal lung units, the classic long-term structural complication emphasized in clinical exams is the collapse of the central/large airways (malacia). Small airway involvement usually manifests as reactive airway disease rather than a primary structural diagnosis. * **D. Interstitial lung disease (ILD):** BPD is a developmental disorder of alveolar simplification, not a primary interstitial process like idiopathic pulmonary fibrosis or surfactant protein deficiencies. **Clinical Pearls for NEET-PG:** * **Definition:** BPD is defined as the need for supplemental oxygen at **36 weeks post-menstrual age (PMA)**. * **Radiology:** Characterized by a "bubbly" appearance or "sponge-like" lungs (coarse opacities with lucent areas). * **Management:** The mainstay is prevention (antenatal steroids, surfactant, gentle ventilation) and supportive care (optimized nutrition, diuretics, and bronchodilators). * **Long-term sequelae:** Increased risk of pulmonary hypertension, recurrent viral bronchiolitis (RSV), and neurodevelopmental delays.

Question 532: Which of the following conditions in a newborn typically resolves spontaneously, EXCEPT?

A. Milia
B. Mongolian spots
C. Erythema toxicum
D. Talipes equinovarus (Correct Answer)

Explanation: **Explanation:** The core concept tested here is the differentiation between **physiological skin/orthopedic variations** in a newborn, which are self-limiting, and **pathological structural deformities** that require medical intervention. **Why Talipes Equinovarus (TEV) is the correct answer:** Talipes equinovarus, commonly known as **Clubfoot**, is a structural congenital deformity characterized by four components: Midfoot adductus, Forefoot varus, Hindfoot equinus, and Hindfoot varus (Mnemonic: **CAVE**). Unlike "positional" talipes, true TEV is not self-limiting. It requires early intervention, typically starting with the **Ponseti method** (serial casting), followed by Achilles tenotomy and bracing to prevent permanent disability. **Analysis of Incorrect Options:** * **Milia:** These are tiny, white, keratin-filled epidermal cysts found on the nose and cheeks of 40-50% of newborns. They resolve spontaneously within the first few weeks of life as the cysts rupture. * **Mongolian Spots (Congenital Dermal Melanocytosis):** These are blue-grey pigmented macules typically found over the sacrum or buttocks. They are due to delayed migration of melanocytes and usually fade by age 2–4 years. * **Erythema Toxicum Neonatorum:** A benign, self-limiting rash appearing in the first 24–48 hours of life. It is characterized by erythematous macules with central yellow-white papules or pustules. A Tzanck smear would show **eosinophils**. It resolves within 1–2 weeks. **High-Yield Clinical Pearls for NEET-PG:** * **Erythema Toxicum:** Contains **Eosinophils**; **Transient Neonatal Pustular Melanosis (TNPM):** Contains **Neutrophils** (present at birth). * **Epstein’s Pearls:** Small white papules on the hard palate (midline); these are the mucosal equivalent of Milia and also resolve spontaneously. * **Salmon Patch (Stork Bite):** Most common vascular lesion of infancy; usually fades by 1 year of age.

Question 533: What are the FDA indications for inhaled nitric oxide?

A. Malignant hypertension
B. Pulmonary hypertension in a newborn (Correct Answer)
C. Cyanotic congenital heart disease
D. None of the above

Explanation: **Explanation:** Inhaled Nitric Oxide (iNO) is a potent, selective pulmonary vasodilator. It works by increasing intracellular cGMP levels in vascular smooth muscle, leading to relaxation. Because it is inhaled, it specifically targets ventilated alveoli, improving ventilation-perfusion (V/Q) matching without causing systemic hypotension. **Why Option B is Correct:** The FDA has approved iNO specifically for the treatment of **Persistent Pulmonary Hypertension of the Newborn (PPHN)** in term and near-term neonates (>34 weeks gestation) who have hypoxic respiratory failure. It reduces the need for Extracorporeal Membrane Oxygenation (ECMO) by decreasing pulmonary artery pressure and improving oxygenation. **Why Other Options are Incorrect:** * **Option A (Malignant Hypertension):** This is a systemic hypertensive emergency. iNO is rapidly inactivated by hemoglobin when it enters the bloodstream, meaning it has **no systemic effect** and cannot treat systemic hypertension. * **Option C (Cyanotic Congenital Heart Disease):** iNO is generally not the primary FDA-indicated treatment here. In fact, in ductal-dependent lesions (like Hypoplastic Left Heart Syndrome), iNO can be dangerous as it may decrease pulmonary vascular resistance too much, leading to pulmonary over-circulation and systemic steal. **High-Yield Clinical Pearls for NEET-PG:** * **Starting Dose:** Usually 20 ppm (parts per million). * **Monitoring:** Always monitor for **Methemoglobinemia** and Nitrogen Dioxide ($NO_2$) levels during therapy. * **Rebound Effect:** Abrupt withdrawal can cause "rebound pulmonary hypertension"; therefore, iNO must be weaned gradually. * **Contraindication:** It is contraindicated in neonates known to be dependent on **right-to-left shunts** (e.g., severe left-sided obstructive lesions).

Question 534: Extremely low birth weight (ELBW) child is defined as?

A. less than 2500 gm
B. less than 2000 gm
C. less than 1500 gm
D. less than 1000 gm (Correct Answer)

Explanation: **Explanation:** The classification of birth weight is a fundamental concept in neonatology, used to predict neonatal morbidity and mortality. The correct answer is **D (less than 1000 gm)**. **1. Why Option D is Correct:** According to the World Health Organization (WHO) and the American Academy of Pediatrics (AAP), an **Extremely Low Birth Weight (ELBW)** infant is defined as a neonate born with a birth weight of **less than 1000 grams** (typically regardless of gestational age). These infants are at the highest risk for complications like Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **2. Analysis of Incorrect Options:** * **Option A (<2500 gm):** This defines **Low Birth Weight (LBW)**. It is the most common category and includes both preterm infants and small-for-gestational-age (SGA) infants. * **Option B (<2000 gm):** There is no specific WHO nomenclature for this cutoff; however, in some clinical settings, it is used as a threshold for specialized nursery care. * **Option C (<1500 gm):** This defines **Very Low Birth Weight (VLBW)**. These infants require intensive care but generally have better survival rates than ELBW infants. **3. High-Yield Clinical Pearls for NEET-PG:** * **Micropremie:** A term often used for infants weighing less than 750g or born before 26 weeks of gestation. * **Macrosomia:** Defined as a birth weight >4000 gm (or >4500 gm in some guidelines), often associated with maternal diabetes. * **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR. Formula: $[Weight (g) \times 100] / [Length (cm)]^3$. * **Survival:** The limit of viability is currently considered to be around 22–24 weeks of gestation or a weight of approximately 500g.

Question 535: A newborn infant presents with excessive frothing and choking upon attempted feeding, despite a normal APGAR score at birth. What is the investigation of choice?

A. Esophagoscopy
B. Bronchoscopy
C. MRI chest
D. X-ray chest and abdomen with a red rubber catheter passed per orally into the esophagus (Correct Answer)

Explanation: ### Explanation The clinical presentation of excessive frothing from the mouth and choking during the first feed is a classic triad for **Tracheoesophageal Fistula (TEF) with Esophageal Atresia (EA)**. **1. Why the Correct Answer is Right:** The initial step in diagnosing EA is attempting to pass a **stiff, wide-bore (10-12 Fr) radio-opaque red rubber catheter** through the mouth into the esophagus. In cases of atresia, the catheter will meet resistance and "coil" in the upper esophageal pouch (usually at 10–12 cm). An **X-ray of the chest and abdomen** is then performed to: * Confirm the level of the blind pouch (coiled catheter). * Check for the presence of **bowel gas**; its presence indicates a distal TEF (the most common type, Type C), while a gasless abdomen indicates pure EA without a distal fistula. **2. Why Incorrect Options are Wrong:** * **Esophagoscopy/Bronchoscopy:** These are invasive and unnecessary for the primary diagnosis. Bronchoscopy may be used pre-operatively to locate the exact site of a fistula, but it is not the initial investigation of choice. * **MRI Chest:** MRI is time-consuming, expensive, and provides no immediate diagnostic advantage over a simple X-ray in a neonate. **3. Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (85%) – Proximal Atresia with Distal Fistula. * **Antenatal Clue:** Polyhydramnios (due to inability to swallow amniotic fluid) and an absent/small stomach bubble on ultrasound. * **VACTERL Association:** Always screen for other anomalies (Vertebral, Anal, Cardiac, TEF, Renal, Limb). The most common associated anomaly is **Cardiac**. * **Management Tip:** Keep the infant in a prone/upright position with continuous suctioning of the upper pouch to prevent aspiration pneumonia before surgery.

Question 536: Which of the following is NOT a feature of acute bilirubin encephalopathy?

A. Lethargy
B. Opisthotonus
C. Exaggerated Moro reflex (Correct Answer)
D. Choreoathetosis

Explanation: **Explanation:** Acute Bilirubin Encephalopathy (ABE) refers to the acute clinical manifestations of bilirubin toxicity in the neonatal brain. The correct answer is **Exaggerated Moro reflex** because, in the early and intermediate phases of ABE, the Moro reflex is typically **depressed or absent**, not exaggerated. **Analysis of Options:** * **A. Lethargy:** This is a hallmark of the **Early Phase** of ABE. Infants typically present with poor feeding, hypotonia, and a decreased level of consciousness (lethargy). * **B. Opisthotonus:** This occurs during the **Intermediate and Advanced Phases**. As toxicity progresses, hypertonia of the extensor muscles leads to retrocollis (neck arching) and opisthotonus (back arching). * **D. Choreoathetosis:** This is a classic feature of **Chronic Bilirubin Encephalopathy (Kernicterus)**. While ABE refers to the acute stage, the question asks for features of the encephalopathy process; choreoathetosis represents the permanent extrapyramidal damage to the basal ganglia. * **C. Exaggerated Moro reflex (Correct):** In ABE, the Moro reflex is characteristically **depressed**. An exaggerated Moro reflex is more commonly associated with Neonatal Abstinence Syndrome or early Hypoxic-Ischemic Encephalopathy (Stage 1). **NEET-PG High-Yield Pearls:** 1. **Kernicterus Triad:** Choreoathetoid cerebral palsy, sensorineural hearing loss (SNHL), and upward gaze palsy. 2. **Brain MRI:** The most common finding in the acute phase is increased T1 signal intensity in the **Globus Pallidus**. 3. **Phases of ABE:** * *Phase 1 (Early):* Hypotonia, lethargy, poor suck, depressed Moro. * *Phase 2 (Intermediate):* Hypertonia (opisthotonus), high-pitched cry, fever. * *Phase 3 (Advanced):* Pronounced opisthotonus, seizures, coma, death.

Question 537: Which of the following is NOT a component of neonatal resuscitation?

A. Maintenance of temperature (Correct Answer)
B. Maintenance of respiration
C. Maintenance of circulation
D. Chest compression

Explanation: The core of neonatal resuscitation follows the **NRP (Neonatal Resuscitation Program)** guidelines, which focus on the transition from intrauterine to extrauterine life. **Why "Maintenance of Temperature" is the correct answer:** While thermal regulation is a critical part of **routine newborn care** and is essential during resuscitation to prevent cold stress, it is technically considered a **prerequisite** or a supportive measure rather than a core component of the resuscitation algorithm itself. The question asks for the "components" of resuscitation, which traditionally refer to the active interventions required to restore vital functions: Airway, Breathing, and Circulation (the ABCs). **Explanation of Incorrect Options:** * **Maintenance of Respiration:** This is the most critical component. Most neonates require only stimulation or Positive Pressure Ventilation (PPV) to initiate breathing. * **Maintenance of Circulation:** If the heart rate remains <60 bpm despite adequate ventilation, circulatory support is required. * **Chest Compressions:** This is a specific, advanced component of the "Circulation" step in the NRP algorithm, indicated when the heart rate is below 60 bpm after 30 seconds of effective PPV. **High-Yield Clinical Pearls for NEET-PG:** * **The Golden Minute:** The first 60 seconds are allocated for completing the initial steps, re-evaluating, and starting ventilation if required. * **Initial Steps:** Provide warmth, position the airway, clear secretions (if needed), dry, and stimulate. * **Compression-to-Ventilation Ratio:** In neonates, it is **3:1** (90 compressions and 30 breaths per minute). * **Most Important Step:** Effective **ventilation** is the single most important action in neonatal resuscitation.

Question 538: What is the average central aortic pressure in a full-term neonate in mm Hg?

A. 75/50 (Correct Answer)
B. 60/40
C. 40/20
D. 20/10

Explanation: **Explanation:** In a healthy, full-term neonate, the average central aortic pressure (which reflects systemic blood pressure) is approximately **75/50 mm Hg**. This value typically stabilizes within the first 24 hours of life as the infant transitions from fetal to neonatal circulation, characterized by a rise in systemic vascular resistance (SVR) following the removal of the low-resistance placental circuit [1]. **Analysis of Options:** * **A (75/50 mm Hg):** This is the standard physiological mean for a term infant. The mean arterial pressure (MAP) usually corresponds to the gestational age in weeks (e.g., a 40-week infant should have a MAP >40 mm Hg); here, the MAP would be approximately 55-60 mm Hg. * **B (60/40 mm Hg):** While these values may be seen in the first few hours of life or in late-preterm infants, they are lower than the established average for a stable, full-term neonate. * **C (40/20 mm Hg):** This represents significant hypotension in a term infant and is more characteristic of a very low birth weight (VLBW) preterm neonate. * **D (20/10 mm Hg):** These values are extremely low and would indicate profound shock or are more reflective of pressures found in the fetal pulmonary artery rather than the postnatal aorta [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** In the NICU, the minimum acceptable Mean Arterial Pressure (MAP) is generally equal to the infant's **gestational age in weeks**. * **Transition:** Blood pressure rises significantly during the first week of life as the ductus arteriosus closes and SVR increases [2]. * **Cuff Size:** For accurate measurement, the blood pressure cuff width should be **40-50%** of the circumference of the arm. A cuff that is too small will provide a falsely elevated reading.

Question 539: Thrombocytopenia, macerated skin lesions, rash, and periostitis in a newborn are characteristic of which condition?

A. Erythroblastosis fetalis
B. Cytomegalovirus infection
C. Syphilis (Correct Answer)
D. HIV infection

Explanation: **Explanation:** The clinical presentation of thrombocytopenia, macerated skin lesions, and periostitis in a newborn is classic for **Congenital Syphilis**, caused by *Treponema pallidum*. **Why Syphilis is correct:** Congenital syphilis typically presents in two stages: early (before 2 years) and late. * **Skin Lesions:** Macerated, bullous lesions (Pemphigus syphiliticus) or a maculopapular rash involving the palms and soles are hallmark signs. * **Bone Involvement:** Periostitis and osteochondritis (e.g., Wimberger’s sign—metaphyseal lucency of the proximal tibia) are highly characteristic and often cause "pseudoparalysis of Parrot" due to pain. * **Hematology:** Thrombocytopenia and anemia are common due to bone marrow involvement. * **Other signs:** Snuffles (hemorrhagic rhinitis) and hepatosplenomegaly. **Why other options are incorrect:** * **Erythroblastosis fetalis:** Presents with severe anemia, jaundice, and hydrops fetalis due to Rh/ABO incompatibility, but does not cause periostitis or specific skin rashes. * **Cytomegalovirus (CMV):** While it causes thrombocytopenia (blueberry muffin spots) and hepatosplenomegaly, its hallmark is **periventricular calcifications** and microcephaly, not periostitis or macerated skin. * **HIV infection:** Usually asymptomatic at birth. Clinical features like lymphadenopathy and failure to thrive develop later in infancy. **High-Yield Pearls for NEET-PG:** * **Hutchinson’s Triad (Late Syphilis):** Interstitial keratitis, Sensorineural hearing loss (8th nerve deafness), and Hutchinson’s teeth. * **Mulberry molars** and **Saddle nose** deformity are other late features. * **Screening:** VDRL/RPR (Nonspecific); **Confirmation:** FTA-ABS or TP-PA (Specific). * **Treatment of choice:** Aqueous Crystalline Penicillin G for 10 days.

Question 540: A baby is born with meconium-stained liquor. All of the following are taken into account in terming a baby 'vigorous' EXCEPT:

A. Tone
B. Colour (Correct Answer)
C. Heart Rate
D. Respiration

Explanation: In the management of a neonate born through **Meconium-Stained Amniotic Fluid (MSAF)**, the clinical decision-making process depends on whether the baby is "vigorous" or "non-vigorous." ### **Why "Colour" is the Correct Answer** According to the **Neonatal Resuscitation Program (NRP)** guidelines, the definition of a **vigorous** infant is based on three specific clinical parameters: 1. **Strong respiratory effort** (crying or regular breathing) 2. **Good muscle tone** (active movement or flexed extremities) 3. **Heart rate > 100 beats per minute** **Colour** is excluded from this definition because peripheral cyanosis (acrocyanosis) is a physiological finding in the first few minutes of life and is not a reliable indicator of the need for immediate tracheal suctioning or resuscitation in the context of meconium. ### **Analysis of Incorrect Options** * **Tone (Option A):** A vigorous baby must have good muscle tone. Limp or floppy extremities indicate a non-vigorous state. * **Heart Rate (Option C):** A heart rate of >100 bpm is a core requirement for being termed vigorous. * **Respiration (Option D):** Strong respiratory efforts or a loud cry are essential criteria. ### **Clinical Pearls for NEET-PG** * **Current Protocol:** Routine endotracheal suctioning for non-vigorous infants is **no longer recommended** by the latest NRP guidelines. Initial steps (warming, drying, stimulating) should be performed first. * **Suctioning:** If the baby is non-vigorous and has poor respiratory effort, the priority is **Positive Pressure Ventilation (PPV)**. Direct laryngoscopy and tracheal suctioning are only considered if the airway is obstructed. * **Apgar vs. Vigorous Criteria:** Do not confuse these. While "Colour" is a component of the **APGAR score**, it is specifically omitted from the "Vigorous" criteria used for MSAF management.

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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