// AEMT Question · Advanced Airway
A low ETCO2 (<25 mmHg) with normal SpO2 during CPR may indicate:
A. Effective compressions
B. Poor compression quality or ROSC just occurredCorrect
C. Airway obstruction
D. Hyperventilation
// Rationale
Persistently low ETCO2 during CPR indicates poor perfusion from compressions or arrest state; a sudden rise suggests ROSC.