Neonatology Practice Questions

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.

Q: Dried blood drops from an infant can be used to screen for which of the following?

Inborn errors of metabolism. **Explanation:** The correct answer is **Inborn Errors of Metabolism (IEM)**. This screening method is known as the **Guthrie Test** or **Newborn Screening (NBS)** using **Dried Blood Spots (DBS)**. 1. **Why it is correct:** Dried blood spots are collected by pricking the infant's heel (Heel-prick test) and dropping the blood onto specialized filter paper (Whatman 903). This method is ideal for screening IEMs because the samples are stable, easy to transport, and can be analyzed using **Tandem Mass Spectrometry (TMS)**. Common conditions screened include Phenylketonuria (PKU), Congenital Hypothyroidism, Galactosemia, and G6PD deficiency. 2. **Why other options are incorrect:** * **Blood sugar levels:** These require immediate analysis of fresh whole blood (usually via glucometer or venous sample) to manage acute hypoglycemia; dried spots are not suitable for real-time monitoring. * **Hepatitis infection:** Screening for Hepatitis B or C in neonates typically involves serological markers (HBsAg) or PCR from fresh serum/plasma, not routine dried blood spots. * **Congenital cataracts:** This is a clinical diagnosis made via the **Red Reflex Test** (Bruckner test) using an ophthalmoscope, not a laboratory blood test. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** NBS should ideally be performed **48–72 hours after birth** to ensure the infant has ingested sufficient protein (for PKU) and to avoid the physiological TSH surge. * **Most common IEM in India:** Congenital Hypothyroidism (CH) followed by G6PD deficiency. * **The "Guthrie Test"** specifically refers to the original bacterial inhibition assay for Phenylketonuria. * **Storage:** DBS samples can be stored at room temperature for long periods, making them excellent for large-scale epidemiological studies.

Question 1

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 2

What percentage of sucrose solution is used for newborn analgesia?

Accepted Answer

24%

Answer

5%

Answer

10%

Answer

50%

Question 3

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 4

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 5

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

Question 6

Dried blood drops from an infant can be used to screen for which of the following?

Accepted Answer

Inborn errors of metabolism

Answer

Blood sugar levels

Answer

Hepatitis infection

Answer

Congenital cataracts

Question 7

In Rh isoimmunization, exchange transfusion is indicated in all of the following situations EXCEPT:

Accepted Answer

Hydrops fetalis

Answer

Cord blood hemoglobin < 10 g/dL

Answer

Cord bilirubin > 5 mg/dL

Answer

Direct Coombs Test (DCT) positive with a history of a previously affected sibling

Question 8

A neonate presents with a warm abdomen but cold extremities. What is the likely condition?

Accepted Answer

Cold stress

Answer

Normal body temperature

Answer

Severe hypothermia

Answer

Shock

Question 9

What is the common cause of neonatal hypoglycemia?

Accepted Answer

Infant of diabetic mother

Answer

Deficiency of glucagon

Answer

Glycogen storage diseases

Answer

Maple syrup urine disease

Question 10

A neonate delivered at 38 weeks of gestation with a birth weight of 2.2 kg develops intolerance to feeds and abdominal distension on the second day of life. Physical examination is unremarkable. Sepsis screen is negative. PCV is observed to be 72%. What is the best management option?

Accepted Answer

Partial Exchange Transfusion

Answer

Hydration with IV Fluids

Answer

Presumptive treatment for sepsis

Answer

Medical Management for intestinal obstruction

Neonatology — MCQs

Neonatology — MCQs

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