Neonatology Practice Questions

Q: What should be the maximum suction pressure in mmHg when suctioning the airway of neonates during neonatal resuscitation?

100 mmHg. ### Explanation **Correct Answer: C. 100 mmHg** In neonatal resuscitation, suctioning is indicated only if the airway is obstructed by secretions or if positive pressure ventilation (PPV) is required. According to the **Neonatal Resuscitation Program (NRP)** guidelines, the negative pressure for suctioning should be set between **80 and 100 mmHg**. The goal is to provide enough pressure to effectively clear the airway of mucus, blood, or meconium without causing mucosal trauma, laryngeal spasms, or profound **vagal-induced bradycardia**. A pressure of 100 mmHg is considered the upper safe limit for neonates to prevent these complications while ensuring adequate clearance. **Analysis of Options:** * **A. 50 mmHg:** This pressure is generally too low to effectively clear thick secretions or meconium from the oropharynx or trachea. * **B. 80 mmHg:** While this is the lower end of the recommended range (80–100 mmHg), the question asks for the *maximum* suction pressure, making 100 mmHg the more precise answer. * **D. 130 mmHg:** Pressures exceeding 100 mmHg significantly increase the risk of mucosal injury, edema, and reflex bradycardia due to vagal stimulation. **High-Yield Clinical Pearls for NEET-PG:** * **Order of Suctioning:** Always suction the **Mouth** before the **Nose** ("M" before "N") to prevent the infant from aspirating secretions if they gasp when the nose is stimulated. * **Suction Catheter Size:** Usually a 10F or 12F suction catheter is used for the oropharynx. * **Meconium Policy:** Routine intrapartum or post-delivery suctioning for vigorous infants born through meconium-stained amniotic fluid is **no longer recommended**. Suctioning is reserved for non-vigorous infants with evidence of airway obstruction. * **Duration:** Limit each suction attempt to **3–5 seconds** to prevent hypoxia.

Q: What is the normal reticulocyte count in a newborn?

2.5-6%. **Explanation:** The correct answer is **C (2.5-6%)**. **1. Why it is correct:** In utero, the fetus exists in a state of relative hypoxia, which stimulates high levels of erythropoietin (EPO). This leads to active erythropoiesis to ensure adequate oxygen delivery. At birth, a healthy neonate has a high hemoglobin level and a correspondingly high **reticulocyte count (2.5% to 6.5%)**, reflecting this active bone marrow production. Within the first few days of life, as the newborn begins breathing room air, tissue oxygenation increases, EPO levels drop sharply, and the reticulocyte count falls to adult levels (approx. 1%) by the end of the first week. **2. Why other options are incorrect:** * **Option A (0.2-1.5%) and B (1-1.6%):** These ranges represent the normal reticulocyte count for **older children and adults**. In a newborn, these values would be considered inappropriately low, suggesting suppressed erythropoiesis. * **Option D (6-10.2%):** This range is excessively high. While reticulocyte counts can be slightly higher in preterm infants (up to 8-10%), in a term neonate, a count above 6-7% usually indicates **hemolysis** (e.g., Rh or ABO incompatibility) or acute blood loss. **NEET-PG High-Yield Pearls:** * **Physiological Nadir:** Hemoglobin levels drop after birth, reaching a minimum (approx. 11 g/dL) at **8–12 weeks** in term infants. * **Preterm Nadir:** In preterm infants, this occurs earlier (**3–6 weeks**) and is more profound (7–9 g/dL), known as Anemia of Prematurity. * **Nucleated RBCs:** It is normal to see a few nucleated RBCs (0-10 per 100 WBCs) in a newborn's peripheral smear for the first 3-4 days.

Q: A male baby born at term to an O-negative mother with a positive Coombs test at delivery. The baby weighed 3 kg at birth, and his hemoglobin was 16 g/dL and total serum bilirubin (TSB) was 5 mg/dL. He passed black stools within the first 24 hours of life, and his temperature was 97.7°F. After 5 days, the infant's weight reduced by 60 gm, his axillary temperature dropped to 95°F, and he is jaundiced up to the chest. Parents also reported yellow, seedy stools. Lab investigations show hemoglobin is now 14.4 g/dL, and his TSB is 14 mg/dL. The change in which of the following parameters is of most concern to you as a pediatrician?

Temperature. The correct answer is **Temperature**. ### **Explanation** The most concerning finding in this neonate is the drop in axillary temperature to **95°F (35°C)**, which indicates **moderate hypothermia**. In a 5-day-old neonate, hypothermia is a "red flag" sign and is often the earliest clinical manifestation of **neonatal sepsis**. While the jaundice is present, the systemic instability (hypothermia) takes clinical priority as it suggests an underlying infection or metabolic derangement that can be life-threatening. ### **Why other options are incorrect:** * **Hemoglobin:** The drop from 16 g/dL to 14.4 g/dL is a physiological decline. While there is Rh incompatibility (O-negative mother, positive Coombs), the current Hb is well within the normal range for a 5-day-old, and there is no evidence of brisk hemolysis. * **Bilirubin:** A TSB of 14 mg/dL at 5 days of life in a term baby is below the threshold for phototherapy (typically >15-17 mg/dL). Jaundice up to the chest (Kramer Zone 2) correlates with a TSB of roughly 6–10 mg/dL, making 14 mg/dL a non-emergency finding. * **Stool:** The transition from black stools (meconium) to yellow, seedy stools is a **normal physiological transition** indicating adequate breastfeeding and a patent gastrointestinal tract. ### **NEET-PG High-Yield Pearls** * **Neonatal Sepsis:** Unlike adults, neonates often present with **hypothermia** rather than fever. Any temperature <36.5°C (97.7°F) should be investigated. * **Weight Loss:** A weight loss of 60g (2% of birth weight) at day 5 is normal. Term neonates can lose up to **10%** of birth weight in the first week, usually regained by day 10. * **Kramer’s Rule:** Jaundice progresses in a cephalocaudal direction. Zone 1 (Head/Neck: 5mg/dL), Zone 2 (Upper trunk: 10mg/dL), Zone 3 (Lower trunk: 12mg/dL).

Q: Key features of kangaroo mother care are all the following EXCEPT?

Done for babies with cyanosis. **Explanation:** Kangaroo Mother Care (KMC) is a standardized, low-cost method of care for low birth weight (LBW) and preterm infants. The correct answer is **D** because KMC is only indicated for **hemodynamically stable** neonates. Cyanosis is a clinical sign of respiratory or cardiac distress; such infants require urgent medical intervention (oxygen therapy, resuscitation, or NICU admission) and are not candidates for KMC until they are stabilized. **Analysis of Options:** * **A. Skin-to-skin contact:** This is the hallmark of KMC. The baby is placed upright between the mother's breasts, providing warmth (thermoregulation) and promoting bonding. * **B. Exclusive breastfeeding:** KMC promotes frequent and exclusive breastfeeding, which is essential for the nutritional and immunological needs of the LBW infant. * **C. Facility to home transition:** KMC should be initiated in the hospital as soon as the baby is stable. It is not a one-time intervention but a continuous process that must be maintained at home after discharge. **High-Yield Clinical Pearls for NEET-PG:** * **Components of KMC:** 1. Kangaroo position (Skin-to-skin), 2. Kangaroo nutrition (Exclusive breastfeeding), 3. Early discharge and follow-up. * **Eligibility:** All stable LBW babies (<2500g). It is most beneficial for those <2000g. * **Duration:** Should be practiced for as long as possible (at least 1 hour per session to avoid frequent handling stress). * **Benefits:** Reduces the risk of hypothermia, sepsis, and hospital stay duration. It is proven to reduce neonatal mortality in LBW infants. * **When to stop:** When the baby reaches ~2500g or starts showing signs of discomfort/wriggling out of the position.

Q: Preterm VLBW infants ingesting unfortified breast milk require supplementation of calcium and vitamin D. What are the recommended daily doses?

Calcium (150-220 mg/kg/day) and vitamin D (200-400 IU/day). **Explanation:** **1. Why Option D is Correct:** Preterm and Very Low Birth Weight (VLBW) infants are at a high risk for **Metabolic Bone Disease of Prematurity (Osteopenia of Prematurity)**. Approximately 80% of fetal mineral accretion (calcium and phosphorus) occurs during the third trimester. When an infant is born prematurely, they miss this critical period of mineral transfer. Human milk, while ideal for term infants, contains insufficient calcium (approx. 25 mg/dL) and phosphorus to meet the high demands of a VLBW infant. To achieve intrauterine accretion rates, these infants require **150–220 mg/kg/day of Calcium** and **200–400 IU/day of Vitamin D**. **2. Why Other Options are Incorrect:** * **Option A & B:** The calcium levels (40–120 mg/kg/day) are too low. These doses might suffice for term infants but fail to prevent rickets and fractures in VLBW infants who require aggressive mineral replacement. * **Option C:** The calcium dose (500–1000 mg/kg/day) is excessively high and physiologically unsafe, potentially leading to nephrocalcinosis and hypercalcemia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Target Phosphorus:** VLBW infants also require **75–140 mg/kg/day of Phosphorus**. * **Fortification:** Standard practice is to use **Human Milk Fortifiers (HMF)** once the infant tolerates 100 mL/kg/day of enteral feeds to bridge this nutritional gap. * **Biochemical Markers:** The earliest sign of metabolic bone disease is often a **low serum phosphorus ( 600-800 IU/L)**. * **Vitamin D Upper Limit:** While 400 IU is the standard recommendation, some guidelines suggest up to 800-1000 IU/day, but for exam purposes, 400 IU remains the classic benchmark.

Q: What is the most common cause of jaundice, irritability, and convulsions in a child with a history of Rh incompatibility?

Kernicterus. ### Explanation The clinical presentation of jaundice, irritability, and convulsions in the context of Rh incompatibility points directly to **Kernicterus** (Bilirubin-induced Neurologic Dysfunction). **1. Why Kernicterus is Correct:** In Rh incompatibility, massive hemolysis leads to high levels of **unconjugated bilirubin (UCB)**. Because UCB is lipid-soluble, it can cross the blood-brain barrier when levels exceed the albumin-binding capacity (typically >20–25 mg/dL in term infants). It deposits in the **basal ganglia** (specifically the globus pallidus) and subthalamic nuclei, causing neurotoxicity. The acute phase manifests as lethargy and poor feeding, progressing to irritability, hypertonia (opisthotonus), and **convulsions**. **2. Why Other Options are Incorrect:** * **Physiological Jaundice:** This is a benign, self-limiting condition occurring after 24 hours of life. Bilirubin levels rarely rise high enough to cause neurological symptoms. * **Hyperpyraxia:** While high fever can cause seizures (febrile seizures), it does not explain the jaundice or the specific history of Rh incompatibility. * **Meningitis:** Although it presents with irritability and convulsions, it is an infectious process. While it must be ruled out in a sick neonate, the specific association with Rh isoimmunization makes Kernicterus the more likely diagnosis. **3. NEET-PG High-Yield Pearls:** * **Most common site affected:** Globus pallidus (Basal Ganglia). * **MRI Finding:** High-intensity signals in the globus pallidus on T2-weighted images. * **Late Sequelae:** Choreoathetoid cerebral palsy, sensorineural hearing loss (SNHL), and upward gaze palsy. * **Prevention:** Administration of **Anti-D (RhoGAM)** to Rh-negative mothers at 28 weeks and within 72 hours of delivery.

Question 1

What should be the maximum suction pressure in mmHg when suctioning the airway of neonates during neonatal resuscitation?

Accepted Answer

100 mmHg

Answer

50 mmHg

Answer

80 mmHg

Answer

130 mmHg

Question 2

An infant is born at 32 weeks gestation weighing 1.4 kg. He has difficulty in breathing immediately after birth, and his condition worsens thereafter. After 5 hours of delivery, the child's respiratory rate is 60/min. On examination, grunting, chest retraction, and marked cyanosis are present, with poor air movement in the chest on auscultation. Which of the following is the most probable cause for the respiratory distress of this neonate?

Accepted Answer

Hyaline membrane disease

Answer

Transient Tachypnea of the newborn

Answer

Meconium Aspiration Syndrome

Answer

Neonatal Apnea

Question 3

What is the normal reticulocyte count in a newborn?

Accepted Answer

2.5-6%

Answer

0.2-1.5%

Answer

1-1.6%

Answer

6-10.2%

Question 4

A premature baby weighing 1.5 kg, born at 32 weeks gestation, develops respiratory distress with grunting. What is the best initial management?

Accepted Answer

Surfactant therapy plus mechanical ventilation

Answer

Continuous Positive Airway Pressure (CPAP)

Answer

Mechanical ventilation

Answer

Humidified oxygen via headbox

Question 5

A neonate with a congenital diaphragmatic hernia presents with respiratory distress. Breath sounds are decreased on the left side. Following bag and mask ventilation, an endotracheal tube is placed, and the maximal cardiac impulse shifts to the right side. What is the next step in management?

Accepted Answer

Remove the tube and reattempt intubation.

Answer

Confirm the position of the endotracheal tube by chest x-ray.

Answer

Insert a nasogastric tube.

Answer

Perform a chest x-ray.

Question 6

A male baby born at term to an O-negative mother with a positive Coombs test at delivery. The baby weighed 3 kg at birth, and his hemoglobin was 16 g/dL and total serum bilirubin (TSB) was 5 mg/dL. He passed black stools within the first 24 hours of life, and his temperature was 97.7°F. After 5 days, the infant's weight reduced by 60 gm, his axillary temperature dropped to 95°F, and he is jaundiced up to the chest. Parents also reported yellow, seedy stools. Lab investigations show hemoglobin is now 14.4 g/dL, and his TSB is 14 mg/dL. The change in which of the following parameters is of most concern to you as a pediatrician?

Accepted Answer

Temperature

Answer

Hemoglobin

Answer

Bilirubin

Answer

Stool

Question 7

Key features of kangaroo mother care are all the following EXCEPT?

Accepted Answer

Done for babies with cyanosis

Answer

Skin to skin contact between mother and baby

Answer

Exclusive breast feeding

Answer

Initiated in a facility and continued at home

Question 8

Preterm VLBW infants ingesting unfortified breast milk require supplementation of calcium and vitamin D. What are the recommended daily doses?

Accepted Answer

Calcium (150-220 mg/kg/day) and vitamin D (200-400 IU/day)

Answer

Calcium (80-120 mg/kg/day) and vitamin D (200-400 IU/day)

Answer

Calcium (40-80 mg/kg/day) and vitamin D (400-1000 IU/day)

Answer

Calcium (500-1000 mg/kg/day) and vitamin D (200-400 IU/day)

Question 9

A newborn baby is Rh positive, born to an Rh negative mother. The cord bilirubin level is 7 mg%, with a conjugated bilirubin of 1 mg%. What is the appropriate treatment?

Accepted Answer

Discontinue breastfeeding and prepare for exchange blood transfusion

Answer

No treatment required

Answer

Discontinue breastfeeding for 48 hours

Answer

Continue breastfeeding and initiate phototherapy

Question 10

What is the most common cause of jaundice, irritability, and convulsions in a child with a history of Rh incompatibility?

Accepted Answer

Kernicterus

Answer

Physiological jaundice

Answer

Hyperpyraxia

Answer

Meningitis

Neonatology — MCQs

Neonatology — MCQs

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