PMC8713731_01
Electrocardiogram (ECG) tracings from the ambulance monitor: (A) ECG tracing from the automated external defibrillator (AED); (B) ECG tracing during transport on the ambulance. The waveform gradually transitioned from sinus rhythm to sinus bradycardia to asystole after the AED was applied (arrows).
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Although the paramedics delivered oxygen and assisted ventilation, the patient developed bradycardia, followed by asystole during transport (Fig. 1).