This rhythm strip shows supraventricular tachycardia with aberrancy. This particular supraventricular tachycardia is atrial flutter. The characteristic features demonstrated here include: A rapid, regular atrial rate of 260 per minute; The wave form has a saw-tooth configuration diagnostic of atrial flutter; The ventricle is responding to every other beat at a heart rate of 130 beats per minute. The QRS complex is regular, but it is wide, demonstrating aberrancy. Aberrancy is due to blocked conduction in one of the bundle branches, usually the right, often related to the increased heart rate which does not allow time for full repolarization.