Neonatology Practice Questions

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.

Q: 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?

Transient tachypnea of the newborn. ### 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.

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

Conservative management. **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.

Q: 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?

Place the infant under a warmer.. **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.

Q: 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?

Renal agenesis. **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 25 cm):** Think of CNS issues (no swallowing) or GI obstructions (Atresias).

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

Intrauterine growth restriction (IUGR). **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 1

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 2

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 3

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 4

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 5

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

Question 6

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?

Accepted Answer

Transient tachypnea of the newborn

Answer

Meconium aspiration syndrome

Answer

Fetal aspiration syndrome

Answer

Hyaline membrane disease

Question 7

Mastitis neonatorum in a newborn is best treated with ___________?

Accepted Answer

Conservative management

Answer

Oral erythromycin

Answer

Local fermentation

Answer

Evacuation by gentle massage

Question 8

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?

Accepted Answer

Place the infant under a warmer.

Answer

Administer intravenously 5ml of D50.

Answer

Obtain a complete blood count and differential.

Answer

Perform a lumbar puncture.

Question 9

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?

Accepted Answer

Renal agenesis

Answer

Anencephaly

Answer

Trisomy 18

Answer

Duodenal atresia

Question 10

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

Accepted Answer

Intrauterine growth restriction (IUGR)

Answer

Mother with hypothyroidism

Answer

Rh incompatibility

Answer

Maternal hyperthyroidism

Neonatology — MCQs

Neonatology — MCQs

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