Atrial flutter: Classification

- Type 1: Typical - Macroreentrant tachycardia (2:1 AV block, 250-350 bpm) involves idioventricular rhythm & tricuspid isthmus in reentry circuit: a) Anticlockwise flutter: -ve F waves in Inf. leads( II, III, avF) b) Clockwise +ve F waves in Inf. leads - Type 2 - Atypical: (3:1 or 4:1 blocks, 350-450 bpm): * mostly for people with previous heart surgery or catheter ablasion