Neonatology Practice Questions

Q: A preterm infant presents with respiratory distress soon after birth. The chest X -ray is given below. What is the most likely diagnosis?

Hyaline membrane disease. ***Hyaline membrane disease*** - Also known as **Respiratory Distress Syndrome (RDS)**, it is primarily caused by **surfactant deficiency** in premature infants, leading to alveolar collapse. - The characteristic chest X-ray findings include **diffuse reticulogranular opacities** (ground-glass appearance) and **air bronchograms**. *Transient tachypnea of the newborn* - Typically occurs in **late preterm or term infants** due to delayed resorption of fetal lung fluid. - Chest X-ray typically shows **perihilar streaking** and **fluid in the interlobar fissures** rather than the diffuse opacification seen in RDS. *Pneumothorax* - Presents with a sudden, localized **collapse of the lung**, often visible on X-ray as a **hyperlucent area** devoid of lung markings. - The clinical picture involves sudden clinical deterioration, decreased unilateral breath sounds, and shifted mediastinum, distinct from the global lung disease of RDS. *Diaphragmatic hernia* - A congenital defect where abdominal viscera herniate into the thoracic cavity, typically presenting with a **scaphoid abdomen** and **loops of bowel** seen within the chest on X-ray. - This condition causes severe respiratory distress due to **pulmonary hypoplasia** and mechanical compression of the lung, unrelated to surfactant deficiency.

Q: A newborn has blue skin, heart rate less than 80/min, absent reflexes, and irregular respiration. What is the Apgar score?

2. ***2*** - The score is calculated as follows: Appearance (blue color) = 0, Pulse (<100 bpm) = 1, Grimace (no response) = 0, Activity (limp) = 0, and Respiration (irregular/slow) = 1, totaling **2**. - An Apgar score of 2 indicates that the newborn is experiencing **severe depression** and requires immediate **resuscitative measures**. *1* - A score of 1 would imply even more severe compromise, likely with an absent heart rate or complete apnea. - Scoring systems are strictly additive based on the **five categories** of Appearance, Pulse, Grimace, Activity, and Respiration. *4* - A score of 4 would require better scores, such as some **flexion of extremities** and a stronger heart rate. - Infants with a score of 4 are typically considered to have **moderate depression** compared to this case. *5* - A score of 5 suggests that the neonate is breathing regularly or has a higher heart rate and better muscle tone. - Five is within the range that might improve with **tactile stimulation** and routine care, unlike score 2 cases needing active resuscitation.

Q: A pregnant woman with SLE delivers a neonate who is found to have a heart rate of 45 beats per minute. ECG confirms complete heart block. Which maternal antibody is most likely responsible?

Anti-Ro antibody. ***Anti-Ro antibody*** - These antibodies (also known as **anti-SSA/Ro**) can cross the **placenta** and cause **neonatal lupus erythematosus**. - The most serious complication associated with transplacental passage is **congenital complete heart block**, caused by antibody-mediated damage to the **fetal AV node**. *Anti-dsDNA antibody* - These are highly specific for **Systemic Lupus Erythematosus (SLE)** and correlate with **disease activity**. - While they are diagnostic markers for active SLE, they are not primarily associated with the development of **congenital heart block**. *Anti-histone antibody* - These are the hallmark diagnostic findings seen in **drug-induced lupus**. - Drug-induced lupus typically presents with arthralgia, myalgia, and fever, but it is not associated with **neonatal heart block**. *Anti-Smith antibody* - These are highly specific for **Systemic Lupus Erythematosus (SLE)** but do not correlate with disease activity. - They do not represent the mechanism underlying the fetal or neonatal cardiac complications like **congenital heart block**.

Q: A neonate presents with prolonged neonatal jaundice, an umbilical hernia, and generalized hypotonia. Which of the following is the most likely underlying diagnosis?

Congenital hypothyroidism. ***Congenital hypothyroidism*** - Prolonged neonatal jaundice is a classic finding due to delayed maturation of hepatic glucuronyl transferase, often combined with an umbilical hernia caused by hypoventilation/hypotonia. - Generalized hypotonia, lethargy, macroglossia, and a large posterior fontanelle are key clinical signs requiring early diagnosis through newborn screening to prevent intellectual disability. *Galactosemia* - Typically presents with vomiting, poor feeding, lethargy, and failure to thrive shortly after milk ingestion, leading to E. coli sepsis and liver failure. - While jaundice is present, the diagnosis is primarily characterized by hepatosplenomegaly and cataracts, rather than umbilical hernia and isolated hypotonia. *Down syndrome* - Features such as hypotonia, upslanting palpebral fissures, and epicanthal folds are common, but they do not typically cause prolonged pathological jaundice. - An umbilical hernia is frequently seen in Down syndrome, but the child would exhibit other dysmorphic stigmata rather than the specific constellation of hypothyroidism signs. *Biliary atresia* - Presents with persistent conjugated hyperbilirubinemia, acholic stools, and hepatomegaly, rather than generalized hypotonia or umbilical hernia. - It is a surgical emergency characterized by progressive fibrosis of the extrahepatic biliary tree, not a metabolic or endocrine issue like the patient's presentation.

Q: What percentage of sucrose solution is used for newborn analgesia?

24%. **Explanation:** **Sucrose analgesia** is a non-pharmacological method used for managing procedural pain in neonates (e.g., heel pricks, venipuncture). The mechanism involves the stimulation of taste receptors on the tongue, which triggers the release of **endogenous opioids** in the midbrain, providing a calming and analgesic effect. * **Why 24% is correct:** Clinical studies and international neonatal guidelines (such as AAP and WHO) have established that a **24% sucrose solution** is the optimal concentration for effective pain relief. It is typically administered orally (on the tip of the tongue) approximately 2 minutes before a painful procedure. * **Why other options are incorrect:** * **5% and 10%:** These concentrations are too dilute to consistently trigger the opioid-mediated analgesic response required for procedural pain. * **50%:** This concentration is hyperosmolar and poses a risk of necrotizing enterocolitis (NEC) or mucosal irritation in fragile neonates. **High-Yield Clinical Pearls for NEET-PG:** * **Duration of effect:** The analgesic effect of sucrose lasts for approximately **5–10 minutes**. * **Synergistic effect:** Sucrose works best when combined with **non-nutritive sucking (NNS)**, such as using a pacifier. * **Age limit:** It is most effective in neonates up to 1 month of age; its efficacy decreases as the infant matures. * **Dosage:** Usually 0.1 ml to 1 ml depending on gestational age and weight. * **Contraindications:** It should be avoided in infants with suspected NEC, bowel obstruction, or tracheoesophageal fistula.

Q: Which of the following is NOT a component of the APGAR score?

Respiratory rate. **Explanation:** The APGAR score is a rapid clinical assessment tool used at 1 and 5 minutes after birth to evaluate a newborn’s transition to extrauterine life. The correct answer is **Respiratory Rate** because the APGAR score assesses **Respiratory Effort** (quality of crying/breathing), not the numerical rate of breaths per minute. **Breakdown of Components (Mnemonic: APGAR):** 1. **A - Appearance (Color):** Evaluates peripheral vs. central cyanosis. (0: Blue/Pale, 1: Acrocyanosis, 2: Completely Pink). 2. **P - Pulse (Heart Rate):** The most important prognostic component. (0: Absent, 1: 100 bpm). 3. **G - Grimace (Reflex Irritability):** Response to suction or stimulation. (0: No response, 1: Grimace, 2: Cry/Cough/Sneeze). 4. **A - Activity (Muscle Tone):** Degree of flexion. (0: Limp, 1: Some flexion, 2: Active motion). 5. **R - Respiration (Respiratory Effort):** Focuses on the vigor of the cry. (0: Absent, 1: Slow/Irregular, 2: Good/Strong cry). **Why the other options are incorrect:** Options A (Color), B (Muscle tone), and C (Heart rate) are all standard parameters measured in the 10-point scoring system. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Routinely done at 1 and 5 minutes. If the 5-minute score is <7, it is repeated every 5 minutes up to 20 minutes. * **Significance:** The 1-minute score indicates the need for immediate resuscitation; the 5-minute score is a better predictor of long-term neurological survival. * **Limitations:** APGAR score is **NOT** used to decide when to initiate resuscitation; resuscitation must begin immediately if the infant is apneic or gasping. * **Most sensitive parameter to hypoxia:** Heart Rate. * **Last parameter to disappear:** Heart Rate.

Q: What is the probable bilirubin level of this neonate?

18 mg/dL. ***18 mg/dL*** - Jaundice extending to the **palms and soles** indicates **Kramer's Zone 5**, which corresponds to bilirubin levels of **15-18 mg/dL**. - This represents **severe neonatal jaundice** requiring immediate evaluation and potential intervention to prevent **kernicterus**. *6 mg/dL* - This level corresponds to **Kramer's Zone 1**, where jaundice is limited to the **head and neck** only. - Clinical jaundice at this level would not extend to the **extremities** as seen in this case. *9 mg/dL* - This level corresponds to **Kramer's Zone 2**, where jaundice extends to the **upper trunk** above the umbilicus. - Jaundice would not reach the **palms and soles** at this relatively low bilirubin concentration. *12 mg/dL* - This level corresponds to **Kramer's Zone 3**, where jaundice extends to the **lower trunk** and **upper thighs**. - The **hands and feet** would still be **spared** at this bilirubin level, unlike the current presentation.

Question 1

A preterm infant presents with respiratory distress soon after birth. The chest X -ray is given below. What is the most likely diagnosis?

Accepted Answer

Hyaline membrane disease

Answer

Transient tachypnea of the newborn

Answer

Pneumothorax

Answer

Diaphragmatic hernia

Question 2

A newborn has blue skin, heart rate less than 80/min, absent reflexes, and irregular respiration. What is the Apgar score?

Accepted Answer

2

Answer

1

Answer

4

Answer

5

Question 3

A 3-hour-old newborn is found to have a blood glucose level of 38 mg/dL on routine screening.
The neonate is asymptomatic. What is the most appropriate next step in management?

Accepted Answer

Continue breastfeeding and reassess blood glucose after the next feed

Answer

Initiate 5% dextrose infusion intravenously

Answer

Leave as is and reassure the parents

Answer

Administer a 5% dextrose bolus and reassess

Question 4

A pregnant woman with SLE delivers a neonate who is found to have a heart rate of 45 beats per
minute. ECG confirms complete heart block. Which maternal antibody is most likely responsible?

Accepted Answer

Anti-Ro antibody

Answer

Anti-dsDNA antibody

Answer

Anti-histone antibody

Answer

Anti-Smith antibody

Question 5

A neonate presents with prolonged neonatal jaundice, an umbilical hernia, and generalized
hypotonia. Which of the following is the most likely underlying diagnosis?

Accepted Answer

Congenital hypothyroidism

Answer

Galactosemia

Answer

Down syndrome

Answer

Biliary atresia

Question 6

A 28-week preterm male neonate is delivered via emergency caesarean section due to placental abruption. Within minutes of birth, he develops grunting, subcostal retractions, and cyanosis with an SpO2 of 78% on room air. His Apgar scores are 4 and 6 at 1 and 5 minutes respectively. He is intubated and placed on mechanical ventilation. A chest X-ray is obtained (Image 1). Which of the following is the most appropriate immediate pharmacological intervention to address the underlying pathophysiology demonstrated on this X-ray?

Accepted Answer

A. Intratracheal instillation of exogenous surfactant (poractant alfa)

Answer

B. Intravenous broad-spectrum antibiotics targeting group B Streptococcus

Answer

C. Inhaled nitric oxide to reduce pulmonary vascular resistance

Answer

D. Intravenous dexamethasone to accelerate pulmonary maturation

Question 7

What percentage of sucrose solution is used for newborn analgesia?

Accepted Answer

24%

Answer

5%

Answer

10%

Answer

50%

Question 8

Which of the following is NOT a component of the APGAR score?

Accepted Answer

Respiratory rate

Answer

Color

Answer

Muscle tone

Answer

Heart rate

Question 9

What is the probable bilirubin level of this neonate?

Accepted Answer

18 mg/dL

Answer

6 mg/dL

Answer

9 mg/dL

Answer

12 mg/dL

Question 10

All of the following are true about congenital diaphragmatic hernia EXCEPT:

Accepted Answer

Pulmonary dilators markedly improve survival

Answer

Usually associated with polyhydramnios

Answer

Most commonly seen on the left side

Answer

Mortality is associated with pulmonary hypoplasia

Neonatology — MCQs

Neonatology — MCQs

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