APGAR Scoring and Neonatal Resuscitation MCQ — NEET PG Practice Question | NEETPGAI
APGAR Scoring and Neonatal Resuscitation
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smile Pediatrics
A term newborn delivered vaginally has an APGAR score of 3 at 1 minute (blue, flaccid, no response to stimulation, gasping respirations, no heart rate audible). After immediate resuscitation measures are initiated, which is the most appropriate investigation to assess the severity of perinatal asphyxia and guide prognosis?
A. Umbilical artery blood gas analysis
B. Cranial ultrasound at 24 hours
C. Serum lactate level at 6 hours
D. Electroencephalography at 12 hours
Explanation
Investigation of Choice for Perinatal Asphyxia Assessment
Key Point
Umbilical artery blood gas (UABG) analysis is the gold standard investigation to objectively document fetal hypoxia and metabolic acidosis at the time of birth, providing immediate evidence of perinatal asphyxia severity.
Why Umbilical Artery Blood Gas?
High-YieldNEET PG
UABG must be sampled immediately after delivery (within 30 seconds) from the umbilical artery (not vein) to reflect fetal acid-base status during labor and delivery. It is:
Objective and quantifiable — provides pH, base deficit, lactate, and PaCO₂
Time-sensitive — must be drawn immediately; delayed sampling loses diagnostic value
Prognostically significant — base deficit ≥12 mmol/L correlates with increased risk of hypoxic-ischemic encephalopathy (HIE)
Guideline-mandated — recommended by ACOG, AAP, and Indian pediatric guidelines for all suspected perinatal asphyxia cases
Diagnostic Criteria for Perinatal Asphyxia (UABG)
Table
Parameter
Threshold for Significant Asphyxia
Umbilical artery pH
< 7.0
Base deficit
≥ 12 mmol/L
Lactate
> 5 mmol/L
Clinical Pearl
A low APGAR score alone is NOT sufficient to diagnose perinatal asphyxia; UABG confirmation is essential because APGAR can be low from prematurity, maternal sedation, or congenital anomalies unrelated to hypoxia.
Mnemonic: UABG Timing — "RIGHT NOW"
Right after delivery
Immediately from artery (not vein)
Gas analysis for pH, base deficit
Helps guide HIE management
Time-critical sampling
Needed for prognostication
Objective evidence of asphyxia
Within 30 seconds of delivery
Role of Other Investigations
Serum lactate at 6 hours: Useful as a prognostic marker for HIE severity but NOT the immediate investigation of choice; lactate rises over hours and reflects ongoing tissue hypoxia, not acute birth asphyxia
Cranial ultrasound at 24 hours: Used to detect structural brain injury (edema, hemorrhage) but is a follow-up imaging tool, not the acute assessment of asphyxia severity
EEG at 12 hours: Indicated for neonates with suspected HIE to assess seizure activity and guide therapeutic hypothermia decisions, but not the primary investigation for asphyxia confirmation
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