APGAR Scoring and Neonatal Resuscitation MCQ — NEET PG Practice Question | NEETPGAI
APGAR Scoring and Neonatal Resuscitation
hard
smile Pediatrics
A 2-hour-old preterm infant (32 weeks gestation) born to a mother with prolonged rupture of membranes has an APGAR score of 4 at 1 minute (HR 80, weak cry, limp, cyanotic, no response to stimulation). Which feature best distinguishes primary apnea from secondary apnea in this clinical context?
A. Flaccidity with absent heart rate response to stimulation
B. Absence of spontaneous respiratory effort with intact reflex response
C. Presence of gasping respirations with bradycardia
D. Cyanosis with weak muscle tone but preserved cry
Explanation
Primary vs. Secondary Apnea: Clinical Discrimination
Pathophysiology & Distinguishing Features
Table
Feature
Primary Apnea
Secondary Apnea (Asphyxial)
Onset
Early; brief hypoxia
Prolonged/severe hypoxia
Respiratory Pattern
Cessation of breathing; responds to stimulation
Gasping respirations → complete apnea
Heart Rate
Mild bradycardia (>80 bpm)
Severe bradycardia (<60 bpm), falling BP
Muscle Tone
Preserved or mildly decreased
Severe flaccidity
Reflex Response
Intact—responds to stimulation
Absent—no response to stimulation
Prognosis
Self-resolving with stimulation
Requires PPV; risk of HIE
Mechanism
Central respiratory depression
Myocardial hypoxia + cerebral depression
Key Point
The presence of gasping respirations accompanied by bradycardia is the hallmark of secondary (terminal) apnea. In the classic sequence of asphyxia, primary apnea (cessation of breathing with mild bradycardia) is followed by a gasping phase, and then secondary apnea (complete cessation with severe bradycardia and absent reflexes). The gasping + bradycardia combination therefore best distinguishes secondary apnea from primary apnea, where the infant has simply stopped breathing but has not yet entered the gasping-then-collapse phase.
Clinical Pearl
In the delivery room, the NRP algorithm teaches that if a limp, cyanotic neonate does not respond to initial steps (drying, stimulation, positioning), assume secondary apnea and initiate PPV immediately. Gasping with bradycardia signals that the infant has passed through primary apnea and is in the terminal gasping phase preceding secondary apnea—a medical emergency.
High-YieldNEET PG
Per the 2015 NRP (8th edition) and Harrison's Principles of Internal Medicine (21e, Ch 297), the sequence is:
Continued hypoxia → Gasping phase (irregular gasps, worsening bradycardia)
3.
Further hypoxia → Secondary apnea (complete cessation, severe bradycardia, flaccidity, absent reflexes)
The gasping + bradycardia combination is the distinguishing bridge between primary and secondary apnea—it signals that primary apnea has been missed and secondary apnea is imminent or present.
Mnemonic
GASP = Gasping + Apnea + Severe bradycardia + Poor prognosis = Secondary apnea territory. Primary apnea = Preserved reflexes + Responds to stimulation = Reversible.
Why Option A is the Best Discriminator
Option A (Gasping + bradycardia): Correctly identifies the hallmark of secondary/terminal apnea. Gasping respirations with bradycardia indicate the infant has progressed beyond primary apnea into the terminal gasping phase, which immediately precedes or constitutes secondary apnea. This is the textbook distinguishing feature (NRP 8e; Cloherty's Manual of Neonatal Care, 8e).
Option B (Absent spontaneous effort + intact reflex): This describes primary apnea, not secondary apnea. Intact reflex response is a feature of primary apnea, not a distinguishing feature of secondary apnea.
Option C (Flaccidity + absent HR response): While flaccidity is seen in secondary apnea, "absent heart rate response to stimulation" is not the standard discriminating criterion; severe bradycardia (<60 bpm) is.
Option D (Cyanosis + weak tone + preserved cry): A preserved cry indicates primary apnea or mild depression, not secondary apnea.
NRP 8th Edition Guidelines 2015; Harrison's Principles of Internal Medicine 21e Ch 297; Cloherty's Manual of Neonatal Care 8e Ch 5
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