case_images: PMC3714044_01
case_images: Electrocardiogram demonstrating atrial flutter with 1:1 conduction.
case_images: JCHIMP-1-10663-g001.jpg
case_images: PMC3714044_01_JCHIMP-1-10663-g001.jpg
case_images: F0001
case_images: The paramedic crew discovered a wide complex tachycardia at a rate of 300 beats per minute (Fig. 1) and he underwent cardioversion at the scene because of hemodynamic instability.