Neonatology Practice Questions

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

Talipes equinovarus. **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.

Q: What are the FDA indications for inhaled nitric oxide?

Pulmonary hypertension in a newborn. **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).

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

less than 1000 gm. **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 ( 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.

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

Exaggerated Moro reflex. **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.

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

Maintenance of temperature. 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.

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

75/50. **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.

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

Syphilis. **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.

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

Colour. 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.

Question 1

What is a long-term complication of bronchopulmonary dysplasia?

Accepted Answer

Large airway disease

Answer

Decreased functional residual capacity

Answer

Small airway disease

Answer

Interstitial lung disease

Question 2

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

Accepted Answer

Talipes equinovarus

Answer

Milia

Answer

Mongolian spots

Answer

Erythema toxicum

Question 3

What are the FDA indications for inhaled nitric oxide?

Accepted Answer

Pulmonary hypertension in a newborn

Answer

Malignant hypertension

Answer

Cyanotic congenital heart disease

Answer

None of the above

Question 4

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

Accepted Answer

less than 1000 gm

Answer

less than 2500 gm

Answer

less than 2000 gm

Answer

less than 1500 gm

Question 5

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?

Accepted Answer

X-ray chest and abdomen with a red rubber catheter passed per orally into the esophagus

Answer

Esophagoscopy

Answer

Bronchoscopy

Answer

MRI chest

Question 6

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

Accepted Answer

Exaggerated Moro reflex

Answer

Lethargy

Answer

Opisthotonus

Answer

Choreoathetosis

Question 7

Which of the following is NOT a component of neonatal resuscitation?

Accepted Answer

Maintenance of temperature

Answer

Maintenance of respiration

Answer

Maintenance of circulation

Answer

Chest compression

Question 8

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

Accepted Answer

75/50

Answer

60/40

Answer

40/20

Answer

20/10

Question 9

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

Accepted Answer

Syphilis

Answer

Erythroblastosis fetalis

Answer

Cytomegalovirus infection

Answer

HIV infection

Question 10

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

Accepted Answer

Colour

Answer

Tone

Answer

Heart Rate

Answer

Respiration

Neonatology — MCQs

Neonatology — MCQs

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