Neonatology Practice Questions

Q: All of the following are accepted therapeutic measures initiated in hyperammonemic states in an infant except?

Exchange transfusion to remove ammonia. **Explanation:** Hyperammonemia in neonates is a medical emergency, most commonly caused by Urea Cycle Disorders (UCDs) or Organic Acidemias. The primary goal of management is to stop ammonia production and enhance its excretion. **Why Option D is the correct answer (the "Except"):** While **Exchange Transfusion** was used historically, it is now considered **inefficient and obsolete** for treating hyperammonemia. It removes only a negligible amount of ammonia compared to modern techniques. The current "gold standard" for rapid ammonia removal in neonates is **Continuous Renal Replacement Therapy (CRRT)** or **Hemodialysis**, which are significantly more effective. **Analysis of Incorrect Options (Accepted Measures):** * **Option A & B:** Management requires stopping all protein intake to halt ammonia production. To prevent endogenous protein breakdown (catabolism), the infant must receive high caloric intake via **IV Dextrose (10-12 mg/kg/min) and Lipids**. Once ammonia levels stabilize, **Essential Amino Acids** are reintroduced early (within 24-48 hours) to support growth and prevent further catabolism. * **Option C:** These are "Ammonia Scavengers." **Sodium Benzoate and Sodium Phenylacetate** provide alternative pathways for nitrogen excretion (bypassing the urea cycle). **Arginine** is essential because it becomes a "rate-limiting" amino acid in most UCDs. **High-Yield Clinical Pearls for NEET-PG:** 1. **First-line investigation:** Arterial Ammonia levels (Normal 500 µmol/L or non-responsive to drugs). 3. **Commonest UCD:** Ornithine Transcarbamylase (OTC) deficiency (X-linked recessive). 4. **Clinical Clue:** A neonate with a "symptom-free interval" followed by poor feeding, vomiting, and encephalopathy (lethargy/seizures) without sepsis.

Q: Meconium ileus is associated with all of the following except?

Maternal hypertension. Meconium ileus is a condition where thick, inspissated meconium causes intestinal obstruction, typically at the level of the terminal ileum. While most commonly associated with **Cystic Fibrosis** (80-90% of cases), it is also linked to several metabolic and functional disorders. **Explanation of the Correct Answer:** **D. Maternal hypertension** is the correct answer because it is **not** a recognized risk factor for meconium ileus. Maternal hypertension is more frequently associated with intrauterine growth restriction (IUGR) or placental insufficiency, but it does not directly affect the viscosity of fetal meconium or intestinal motility in a way that leads to ileus. **Analysis of Incorrect Options:** * **A. Hirschsprung's disease:** Although primarily a cause of delayed meconium passage due to aganglionosis, it can present with a clinical picture similar to meconium ileus (meconium plug syndrome) due to functional obstruction. * **B. Maternal diabetes:** Infants of diabetic mothers (IDM) have an increased risk of **Small Left Colon Syndrome**, a functional obstruction related to meconium plugging, often grouped under the differential diagnosis of meconium ileus. * **C. Hypothyroidism:** Congenital hypothyroidism leads to decreased gut motility (peristalsis), which can result in delayed passage of meconium and inspissation, mimicking or causing meconium ileus. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Gastrografin enema (both diagnostic and therapeutic; the hyperosmolar solution draws water into the bowel to soften meconium). * **X-ray Finding:** "Ground glass" or "Soap bubble" appearance (Neuhauser’s sign) due to air mixing with meconium. * **Associated Finding:** Microcolon (due to disuse of the distal colon). * **Most Common Cause:** Cystic Fibrosis (always screen these neonates with a sweat chloride test).

Q: Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Usually occurs in exclusively breastfed babies. **Explanation:** Hemorrhagic Disease of the Newborn (HDN), now termed **Vitamin K Deficiency Bleeding (VKDB)**, is classified into three types based on the timing of onset: Early, Classical, and Late. **Why Option A is the "Except" (Correct Answer):** The question asks for the feature that is *not* characteristic. While Late VKDB **does** primarily occur in exclusively breastfed babies (because breast milk is a poor source of Vitamin K), the option is marked as the answer likely due to a technicality in the question's framing or a distractor. However, in standard medical literature, exclusive breastfeeding is the **primary risk factor** for Late VKDB. If this is a "single best answer" scenario where all options are technically true, the question may be flawed, but clinically, Late VKDB is defined by its association with breastfeeding and lack of prophylaxis. **Analysis of Other Options:** * **Option B:** Late VKDB typically presents between **2 to 12 weeks** (up to 6 months) of life. * **Option C:** Unlike the Classical form (which presents with GI bleed), Late VKDB has a very high incidence (**50–80%**) of **Intracranial Hemorrhage (ICH)**, leading to high morbidity and mortality. * **Option D:** A single dose of **1 mg Intramuscular (IM) Vitamin K** at birth is highly effective and provides nearly 100% protection against Late VKDB. **High-Yield Clinical Pearls for NEET-PG:** 1. **Early VKDB:** Occurs within 1.5 kg; 0.5 mg for babies <1.5 kg. Oral Vitamin K is less effective for preventing the Late form.

Q: What is the blood glucose level considered hyperglycemia in a neonate?

125 mg/dL. **Explanation:** In neonatology, **hyperglycemia** is defined as a whole blood glucose level **>125 mg/dL** or a plasma glucose level **>145–150 mg/dL**, regardless of the infant's gestational age or weight. The threshold of 125 mg/dL is clinically significant because it often exceeds the renal threshold for glucose in preterm neonates, leading to **osmotic diuresis**, dehydration, and an increased risk of intraventricular hemorrhage (IVH) due to rapid shifts in serum osmolality. **Analysis of Options:** * **Option B (125 mg/dL):** This is the standard diagnostic cutoff for whole blood glucose in neonates. It is a high-yield fact frequently tested in NEET-PG. * **Option A & C (150 mg/dL & 180 mg/dL):** While these values represent significant hyperglycemia and are often the thresholds for initiating medical intervention (like insulin or reducing glucose infusion rates), they are not the *defining* lower limit. 150 mg/dL is specifically the threshold for plasma glucose. * **Option D (100 mg/dL):** This is within the normal glycemic range for a stable neonate. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** Iatrogenic (excessive Glucose Infusion Rate - GIR) is the most common cause, especially in Very Low Birth Weight (VLBW) infants. 2. **Neonatal Diabetes:** Defined as hyperglycemia occurring within the first month of life lasting >2 weeks; it is most commonly transient. 3. **Management:** The first step is reducing the GIR. Insulin is reserved for persistent hyperglycemia (>200–250 mg/dL) despite GIR optimization. 4. **Hypoglycemia Refresher:** Remember that for NEET-PG, neonatal hypoglycemia is generally defined as <45 mg/dL.

Q: Which of the following is best for the transport of a newborn while maintaining body temperature?

Kangaroo Mother Care (KMC). **Explanation:** The primary goal of neonatal transport is to maintain the "warm chain" to prevent neonatal cold stress and hypoglycemia. **Why Kangaroo Mother Care (KMC) is the Correct Answer:** KMC is considered the **gold standard** for transporting stable low-birth-weight (LBW) newborns, especially in resource-limited settings. It utilizes **skin-to-skin contact**, where the mother’s body acts as a natural "active" heat source, providing continuous thermal regulation. Unlike mechanical devices, KMC also facilitates breastfeeding, reduces transport-related stress, and provides sensory stimulation, making it the most effective and safest method for maintaining temperature during transit. **Analysis of Incorrect Options:** * **Transport Incubator:** While effective, these are expensive, require a continuous power supply, and are often bulky. They are generally reserved for unstable neonates requiring mechanical ventilation. * **Thermacol Box:** This is a "passive" insulation method. While it can reduce heat loss, it cannot generate heat. It is an outdated practice and inferior to the active warming provided by KMC. * **Hot Water Bottle:** This is **strictly contraindicated**. Newborn skin is extremely thin and poorly vascularized; hot water bottles pose a high risk of accidental contact burns and hyperthermia. **High-Yield Clinical Pearls for NEET-PG:** * **Neutral Thermal Environment (NTE):** The environmental temperature range where the baby maintains a normal body temperature with minimum metabolic rate and oxygen consumption. * **Components of KMC:** Skin-to-skin contact, exclusive breastfeeding, and early discharge. * **Transport Criteria:** Always stabilize the "ABC" (Airway, Breathing, Circulation) and ensure the baby is warm before initiating transport. KMC is the preferred method for stable babies <2500g.

Q: A neonate born at 34 weeks gestation with premature rupture of membranes undergoes a chest X-ray. Which of the following is LEAST likely to be considered in the differential diagnosis of the findings on the chest X-ray?

Ventricular septal defect. ***Ventricular septal defect*** - **VSD** primarily causes **cardiomegaly** and **pulmonary plethora** on chest X-ray, not the typical respiratory distress patterns expected in a premature neonate. - The chest X-ray findings in this clinical scenario would more likely show **pulmonary parenchymal changes** rather than cardiac abnormalities. *Congenital pneumonia* - **Premature rupture of membranes (PROM)** significantly increases the risk of **ascending bacterial infection** leading to congenital pneumonia. - Chest X-ray typically shows **bilateral infiltrates**, **consolidation**, or **reticulogranular opacities** similar to other neonatal lung diseases. *Hyaline membrane disease* - **Prematurity at 34 weeks** places this neonate at high risk for **surfactant deficiency** causing hyaline membrane disease (respiratory distress syndrome). - Classic chest X-ray findings include **reticulogranular opacities**, **air bronchograms**, and **low lung volumes**. *Congenital alveolar proteinosis* - Presents with **bilateral pulmonary infiltrates** and **reticulogranular pattern** on chest X-ray, mimicking other neonatal respiratory conditions. - Can cause **respiratory distress** in neonates and appears radiographically similar to **hyaline membrane disease** or **congenital pneumonia**.

Question 1

All of the following are accepted therapeutic measures initiated in hyperammonemic states in an infant except?

Accepted Answer

Exchange transfusion to remove ammonia

Answer

Intravenous administration of 10% dextrose with lipids (1 g/kg/24h)

Answer

Addition of a mixture of essential amino acids (0.25 g/kg/24h)

Answer

Intravenous infusion of sodium benzoate, sodium phenylacetate and arginine

Question 2

Meconium ileus is associated with all of the following except?

Accepted Answer

Maternal hypertension

Answer

Hirschsprung's disease

Answer

Maternal diabetes

Answer

Hypothyroidism

Question 3

Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Accepted Answer

Usually occurs in exclusively breastfed babies

Answer

Onset occurs at 4–12 weeks of age

Answer

Intracranial hemorrhage can occur

Answer

Intramuscular vitamin K prophylaxis at birth has a protective role

Question 4

A 6-hour-old infant delivered with difficulty by low forceps exhibits an asymmetric Moro reflex involving the right arm. The infant is cyanotic and has labored respiration. The abdomen does not bulge with inspiration, and breath sounds are decreased in the right chest. What is the most likely diagnosis?

Accepted Answer

Ipsilateral paralysis of the diaphragm

Answer

Respiratory distress syndrome

Answer

Meconium aspiration syndrome

Answer

Tracheoesophageal fistula

Question 5

A 30-week gestation, 1.2 kg infant develops respiratory distress, grunting, and chest retractions within 2 hours of birth. His respiratory rate is 70/min. What is the MOST appropriate next step in management?

Accepted Answer

Nasal CPAP

Answer

Surfactant therapy plus mechanical ventilation

Answer

Mechanical ventilation only

Answer

Warm humidified oxygen through a hood mask

Question 6

Arrange the following steps of handwashing, before entering a NICU, in proper sequence?

Accepted Answer

1 - 4 - 3 - 2

Answer

1 - 2 - 3 - 4

Answer

4 - 3 - 2 - 1

Answer

3 - 2 - 4 - 1

Question 7

What is the blood glucose level considered hyperglycemia in a neonate?

Accepted Answer

125 mg/dL

Answer

150 mg/dL

Answer

180 mg/dL

Answer

100 mg/dL

Question 8

Which of the following is best for the transport of a newborn while maintaining body temperature?

Accepted Answer

Kangaroo Mother Care (KMC)

Answer

Transport incubator

Answer

Thermacol box

Answer

Hot water bottle

Question 9

A neonate born at 34 weeks gestation with premature rupture of membranes undergoes a chest X-ray. Which of the following is LEAST likely to be considered in the differential diagnosis of the findings on the chest X-ray?

Accepted Answer

Ventricular septal defect

Answer

Congenital pneumonia

Answer

Hyaline membrane disease

Answer

Congenital alveolar proteinosis

Question 10

A 40-year-old man developed burning pain and paresthesias of his left scalp and forehead for 9 days. Three days later, he noted several papules on his scalp, followed the next day by more on his forehead over the left eyebrow and on his left upper eyelid. These evolved into small blisters on which crusts formed. As the older lesions became crusted, new papules appeared in the same general area. Examination revealed several erythematous papules, and groups of clear-fluid-filled vesicles with erythematous bases, and crusted papules in the left anterior scalp, forehead, and upper eyelid. The tip of the nose was spared. If this same condition affects a pregnant female in the 1st trimester, which of the following abnormalities can be seen in the newborn?

Accepted Answer

Cicatricial skin lesions

Answer

Sensorineural hearing loss

Answer

Macroopthalmia

Answer

Hyperpigmentation

Neonatology — MCQs

Neonatology — MCQs

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