// AEMT Question · Advanced Airway
End-tidal CO₂ reading of 4 mmHg during CPR most likely indicates:
A. Good perfusion
B. Inadequate chest compressionsCorrect
C. Hyperventilation
D. Return of spontaneous circulation
// Rationale
Very low ETCO₂ during CPR suggests inadequate compressions or poor perfusion; target >10 mmHg.