Neonatology Practice Questions

Q: A newborn has a heart rate of 90 bpm and gasping respirations. Positive pressure ventilation with room air is initiated. After 60 seconds, the heart rate remains 80 bpm. What is the next step?

Consider tracheal intubation.. ### Explanation The core principle of Neonatal Resuscitation (NRP) is that **effective ventilation** is the most critical step. **1. Why Option B is Correct:** The newborn has a heart rate (HR) < 100 bpm and gasping respirations, which are indications for Positive Pressure Ventilation (PPV). After 60 seconds of PPV, the HR remains below 100 bpm (80 bpm). According to the NRP algorithm, if the HR does not improve despite PPV, the provider must perform **MR. SOPA** (ventilation corrective steps). If HR remains < 100 bpm after corrective steps, **tracheal intubation** or a laryngeal mask is indicated to ensure a secure airway and effective lung inflation before proceeding to further interventions like chest compressions. **2. Why Other Options are Incorrect:** * **Option A:** Continuing PPV with room air is insufficient because the HR has not responded after 60 seconds; escalation of care (corrective steps/airway security) is required. * **Option C:** While oxygen concentration can be increased, the priority is ensuring the *effectiveness* of ventilation via a secure airway. Increasing oxygen to 100% is usually reserved for when chest compressions begin. * **Option D:** CPAP is used for babies who are breathing spontaneously with a HR > 100 bpm but have respiratory distress (labored breathing/cyanosis). It is contraindicated in a baby who is gasping or has a HR < 100 bpm. **Clinical Pearls for NEET-PG:** * **Golden Minute:** The first 60 seconds are for completing the initial steps, evaluating, and starting PPV if needed. * **HR < 60 bpm:** The threshold to start chest compressions (after 30 seconds of effective PPV). * **MR. SOPA:** **M**ask adjustment, **R**eposition airway, **S**uction, **O**pen mouth, **P**ressure increase, **A**lternative airway (Intubation). * **Initial Oxygen:** For newborns ≥35 weeks, start PPV with 21% oxygen (room air). For <35 weeks, start with 21–30%.

Q: All of the following can be normally seen in a neonate at birth except?

Icterus. **Explanation:** The correct answer is **C. Icterus**. **1. Why Icterus is the correct answer:** Icterus (jaundice) is **never** normal at birth. Clinical jaundice appearing within the first 24 hours of life is always considered **pathological**. It usually indicates underlying conditions such as hemolytic disease of the newborn (Rh or ABO incompatibility), intrauterine infections (TORCH), or red cell enzyme defects (G6PD deficiency). Physiological jaundice typically appears only after 48–72 hours of life. **2. Analysis of Incorrect Options:** * **Acrocyanosis:** This refers to the bluish discoloration of the hands and feet due to peripheral vasoconstriction and sluggish capillary circulation. It is a normal finding in the first 24–48 hours of life and does not indicate systemic hypoxia. * **Soft systolic murmur:** Transient systolic murmurs are common in the first 24–48 hours. They often represent the functional closure of the Ductus Arteriosus or peripheral pulmonary artery stenosis as the neonatal circulation transitions. * **Heart rate (120–140/min):** The normal resting heart rate for a term neonate ranges from 120 to 160 beats per minute. A rate of 120–140/min is perfectly physiological. **Clinical Pearls for NEET-PG:** * **Pathological Jaundice Criteria:** Appearance in the first 24 hours, serum bilirubin rising >5 mg/dL/day, total bilirubin >15 mg/dL, or presence of conjugated hyperbilirubinemia. * **Normal Respiratory Rate:** 40–60 breaths/min. Periodic breathing (pauses 20 seconds) is pathological. * **First Void/Stool:** 95% of healthy newborns pass urine and meconium within the first 24 hours. Failure to pass meconium within 48 hours suggests Hirschsprung disease or Meconium Ileus.

Q: What percentage of babies with stage 2 hypoxic-ischemic encephalopathy (HIE) experience adverse neurological outcomes?

20%. **Explanation:** Hypoxic-Ischemic Encephalopathy (HIE) is graded using the **Sarnat and Sarnat Staging** system, which is a critical predictor of long-term neurodevelopmental prognosis in neonates. 1. **Why 20% is correct:** Stage 2 (Moderate HIE) is characterized by lethargy, hypotonia, suppressed primitive reflexes (like sucking), and often, the presence of seizures. While the majority of these infants recover, approximately **20-25%** suffer from long-term adverse neurological outcomes, such as cerebral palsy, intellectual disability, or epilepsy. 2. **Why other options are incorrect:** * **10% (Option A):** This is too low for Stage 2. However, Stage 1 (Mild HIE), characterized by hyperalertness and tachycardia without seizures, carries a near 0% risk of long-term deficits. * **30% (Option B):** While some older studies suggest slightly higher ranges, the standard consensus for "Moderate" HIE in competitive exams remains 20-25%. * **50% (Option D):** This is more representative of Stage 3 (Severe HIE). In Stage 3 (stupor/coma, flaccidity, absent reflexes), the prognosis is grim, with roughly **75-100%** of survivors experiencing severe neurological impairment or death. **High-Yield Clinical Pearls for NEET-PG:** * **Sarnat Staging:** Focus on the duration of symptoms. If Stage 2 symptoms persist for >7 days, the prognosis worsens significantly. * **Therapeutic Hypothermia:** The standard of care for Moderate to Severe HIE. It must be initiated within **6 hours** of birth to be effective. * **EEG Findings:** Periodic patterns or "burst-suppression" are characteristic of Stage 3; low-voltage or multifocal seizures are common in Stage 2.

Q: A 15-day-old baby presents with seizures. Blood tests reveal serum Calcium of 5 mg/dL, Phosphorus levels of 9 mg/dL, and PTH levels of 30 pg/mL (normal range = 10-60 pg/mL). What is the most probable diagnosis?

Hypoparathyroidism. **Explanation:** The clinical presentation of a 15-day-old neonate with seizures, low serum Calcium (5 mg/dL), and high Phosphorus (9 mg/dL) points toward a defect in the Parathyroid Hormone (PTH) axis. **1. Why Hypoparathyroidism is correct:** In a physiological state, low serum calcium should trigger a significant rise in PTH (secondary hyperparathyroidism). In this case, the PTH level (30 pg/mL) is within the "normal" range. However, for a calcium level as low as 5 mg/dL, this PTH level is **inappropriately low**. This indicates that the parathyroid glands are failing to respond to hypocalcemia, confirming **Hypoparathyroidism**. This is often seen in late-onset neonatal hypocalcemia (e.g., DiGeorge syndrome or high phosphate intake). **2. Why other options are incorrect:** * **Pseudohypoparathyroidism:** This is characterized by end-organ resistance to PTH. Therefore, PTH levels would be **markedly elevated** (high PTH, low Ca, high PO4). * **Vitamin D deficiency:** This typically presents with low Calcium and **low Phosphorus** (due to secondary hyperparathyroidism causing phosphaturia). PTH would be elevated. * **Hypoxic Ischemic Encephalopathy (HIE):** While HIE can cause seizures and early neonatal hypocalcemia (within 72 hours), it does not explain the specific biochemical pattern of inappropriately low PTH and high Phosphorus at 15 days of age. **High-Yield Clinical Pearls for NEET-PG:** * **Early-onset Neonatal Hypocalcemia:** Occurs within 72 hours; associated with prematurity, maternal diabetes, and birth asphyxia. * **Late-onset Neonatal Hypocalcemia:** Occurs after 72 hours (usually end of 1st week); associated with high phosphate cow’s milk or hypoparathyroidism. * **PTH/Phosphorus Rule:** If Ca is low and PO4 is high, look at PTH. High PTH = Resistance (Pseudo); Low/Normal PTH = Deficiency (Hypoparathyroidism).

Q: A newborn with 46XX karyotype presents with external genitalia of male. All the following are possible causes EXCEPT:

Anti-Müllerian hormone deficiency. The question describes a case of **46,XX DSD (Disorders of Sex Development)**, where a chromosomal female undergoes virilization of external genitalia due to excess androgen exposure. ### **Explanation of the Correct Answer** **C. Anti-Müllerian Hormone (AMH) deficiency:** This is the correct answer because AMH is responsible for the regression of Müllerian ducts (uterus, fallopian tubes) in males. In a 46,XX individual, there are no testes to produce AMH; therefore, Müllerian structures persist naturally. AMH deficiency (Persistent Müllerian Duct Syndrome) is a condition seen in **46,XY males** who have internal female organs but normal male external genitalia. It does not cause virilization in a 46,XX fetus. ### **Explanation of Incorrect Options** * **A. Placental aromatase deficiency:** Aromatase converts fetal androgens into estrogens. If deficient, fetal androgens (DHEA-S) cross into the maternal circulation and cause virilization of both the mother and the 46,XX fetus. * **B. Maternal androgen adrenal tumor:** High levels of circulating androgens from a maternal tumor (e.g., luteoma or adrenal adenoma) can cross the placenta and virilize the external genitalia of a female fetus. * **D. Wnt 4 mutation:** The *WNT4* gene is essential for ovarian development and acts as an anti-testis strategy. Mutations lead to "SERKAL syndrome," characterized by 46,XX sex reversal with androgen excess and virilization. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common cause of 46,XX DSD:** Congenital Adrenal Hyperplasia (21-Hydroxylase deficiency). * **External Genitalia vs. Internal Ducts:** External genitalia virilization requires **Androgens** (DHT). Internal male duct (Wolffian) development requires **Testosterone**. Internal female duct (Müllerian) regression requires **AMH**. * **Prader Staging:** Used to describe the degree of virilization of external genitalia in 46,XX infants.

Q: Which of the following is NOT a feature of Congenital rubella syndrome?

Anterior Uveitis. **Explanation:** Congenital Rubella Syndrome (CRS) is a classic TORCH infection characterized by a triad of ocular, cardiac, and auditory defects. The correct answer is **Anterior Uveitis** because it is not a typical feature of CRS; instead, it is more commonly associated with other congenital infections like Syphilis or Toxoplasmosis. **Analysis of Options:** * **Congenital Cataract (Option A):** This is a hallmark ocular finding in CRS, often described as "pearly white" and usually bilateral. It occurs due to the virus's persistence in the lens fiber. * **Microphthalmia (Option B):** This refers to abnormally small eyes and is a well-documented structural defect in infants with CRS, often occurring alongside cataracts. * **Salt and Pepper Retinitis (Option C):** This is the **most common** ocular manifestation of CRS. It is characterized by mottled pigmentation of the retina and typically does not affect vision significantly. * **Anterior Uveitis (Option D):** While CRS involves many parts of the eye, primary inflammation of the anterior uvea is not a standard feature. **Clinical Pearls for NEET-PG:** 1. **Gregg’s Triad:** Cataract, Sensorineural Hearing Loss (most common overall feature), and Congenital Heart Disease (PDA is most common; Peripheral Pulmonary Artery Stenosis is most specific). 2. **Dermal Erythropoiesis:** Presents as the "Blueberry muffin rash." 3. **Timing:** The risk of malformations is highest if the mother is infected during the **first trimester** (especially the first 8 weeks). 4. **Diagnosis:** Confirmed by Rubella-specific IgM antibodies in the neonate or persistence of IgG beyond 6–12 months.

Q: What is the most common delivery room emergency in newborns?

Failure to initiate efficient respiration. **Explanation:** **1. Why "Failure to initiate efficient respiration" is correct:** The transition from intrauterine to extrauterine life requires the rapid clearance of lung fluid and the establishment of spontaneous breathing to ensure gas exchange. Approximately **10% of newborns** require some assistance to begin breathing at birth, and about 1% require intensive resuscitative measures. This makes the failure to initiate or sustain spontaneous respiration (Birth Asphyxia) the most frequent emergency encountered in the delivery room. It is the primary indication for the Neonatal Resuscitation Program (NRP) algorithms. **2. Why the other options are incorrect:** * **Shock (A):** While hypovolemic or septic shock can occur, it is significantly less common than respiratory depression at the moment of birth. * **Life-threatening congenital malformations (B):** Conditions like Diaphragmatic Hernia or Gastroschisis are rare (occurring in roughly 1 in 2,000–5,000 births) compared to the high frequency of respiratory distress. * **Convulsions (C):** Neonatal seizures usually manifest hours or days after birth (often as a consequence of HIE following birth asphyxia) rather than as an immediate delivery room emergency. **3. Clinical Pearls for NEET-PG:** * **The "Golden Hour":** The first hour of life is critical; the first 60 seconds (The Golden Minute) are dedicated to starting ventilation if the baby is apneic or gasping. * **Most Important Step in NRP:** Effective **Positive Pressure Ventilation (PPV)** is the single most important and effective step in neonatal resuscitation. * **Initial Assessment:** Based on three questions: Is the infant Term? Does the infant have good Tone? Is the infant Breathing/Crying?

Q: Which of the following is the best indication for transfusion of packed red blood cells to an infant?

Platelets to prevent NAIT. **Explanation:** The correct answer is **D. Platelets to prevent NAIT.** **Neonatal Alloimmune Thrombocytopenia (NAIT)** is the neonatal equivalent of Rh incompatibility, but involving platelets. It occurs when maternal IgG antibodies (most commonly against **HPA-1a**) cross the placenta and destroy fetal platelets. Unlike Rh disease, NAIT can occur in the **first pregnancy**. The most dreaded complication is **Intracranial Hemorrhage (ICH)**, which can occur in utero or shortly after birth. Therefore, the primary management to prevent life-threatening bleeding is the transfusion of compatible platelets (ideally HPA-matched or maternal washed platelets). **Analysis of Incorrect Options:** * **A & C (Plasma):** Fresh Frozen Plasma (FFP) is used for clotting factor deficiencies (like Vitamin K deficiency or DIC). It does not contain platelets and has no role in treating ITP or NAIT. * **B (RBCs to prevent TA-GVH):** Transfusion-Associated Graft-Versus-Host Disease (TA-GVH) is a *complication* of transfusion, not an indication for it. To prevent TA-GVH in neonates, blood products must be **irradiated** to inactivate donor T-lymphocytes. **High-Yield Clinical Pearls for NEET-PG:** * **NAIT vs. ITP:** In NAIT, the mother’s platelet count is **normal**. In maternal ITP, the mother has a **low** platelet count. * **Most common antigen in NAIT:** HPA-1a (Human Platelet Antigen 1a). * **Treatment of choice for NAIT:** Transfusion of HPA-compatible platelets + IVIG. * **Irradiated blood products** are mandatory for intrauterine transfusions, preterm infants, and neonates with suspected immunodeficiency to prevent TA-GVH.

Question 1

A newborn has a heart rate of 90 bpm and gasping respirations. Positive pressure ventilation with room air is initiated. After 60 seconds, the heart rate remains 80 bpm. What is the next step?

Accepted Answer

Consider tracheal intubation.

Answer

Continue positive pressure ventilation with room air.

Answer

Positive pressure ventilation with 50% oxygen.

Answer

CPAP.

Question 2

An infant who appears to be of normal size is noted to be lethargic and somewhat limp on the warmer after birth. The mother is 28 years old, and this is her fourth delivery. The pregnancy was uncomplicated, with normal fetal monitoring prior to delivery. Labor was rapid, with local anesthesia and intravenous meperidine (Demerol) administered for maternal pain control. Which of the following therapeutic maneuvers is likely to improve this infant's condition most rapidly?

Accepted Answer

Administration of naloxone (Narcan)

Answer

Intravenous infusion of 10% dextrose in water

Answer

Administration of vitamin K

Answer

Measurement of electrolytes and magnesium levels

Question 3

All of the following can be normally seen in a neonate at birth except?

Accepted Answer

Icterus

Answer

Acrocyanosis

Answer

Soft systolic murmur

Answer

Heart rate between 120-140/min

Question 4

What percentage of babies with stage 2 hypoxic-ischemic encephalopathy (HIE) experience adverse neurological outcomes?

Accepted Answer

20%

Answer

10%

Answer

30%

Answer

50%

Question 5

A 15-day-old baby presents with seizures. Blood tests reveal serum Calcium of 5 mg/dL, Phosphorus levels of 9 mg/dL, and PTH levels of 30 pg/mL (normal range = 10-60 pg/mL). What is the most probable diagnosis?

Accepted Answer

Hypoparathyroidism

Answer

Pseudohypoparathyroidism

Answer

Vitamin D deficiency

Answer

Hypoxic ischemic encephalopathy

Question 6

All are true regarding periventricular leukomalacia except?

Accepted Answer

Cystic areas in grey matter of brain that develop after ischemic infarction.

Answer

Appear as echolucent areas (cysts) on neuroimaging in preterm neonates.

Answer

Require at least 2 weeks to form.

Answer

Presence at birth helps to determine timing of hemorrhagic events.

Question 7

A newborn with 46XX karyotype presents with external genitalia of male. All the following are possible causes EXCEPT:

Accepted Answer

Anti-Müllerian hormone deficiency

Answer

Placental aromatase deficiency

Answer

Maternal androgen adrenal tumor

Answer

Wnt 4 mutation

Question 8

Which of the following is NOT a feature of Congenital rubella syndrome?

Accepted Answer

Anterior Uveitis

Answer

Congenital Cataract

Answer

Microphthalmia

Answer

Salt and pepper retinitis

Question 9

What is the most common delivery room emergency in newborns?

Accepted Answer

Failure to initiate efficient respiration

Answer

Shock

Answer

Life-threatening congenital malformations

Answer

Convulsions

Question 10

Which of the following is the best indication for transfusion of packed red blood cells to an infant?

Accepted Answer

Platelets to prevent NAIT

Answer

Plasma to prevent ITP

Answer

RBCs to prevent TA-GVH

Answer

Plasma to prevent NAIT

Neonatology — MCQs

Neonatology — MCQs

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