case A1 – atrial flutter adenosine – rhythm strip Published November 29, 2012 at 7940 × 477 in case A1 – atrial flutter adenosine – rhythm strip ← Previous Next → Initially A Flutter 2:1, then A Flutter with about 1:8 block, then atrial arrhythmia breaks and a junctional rhythm then sinus. [click on image for full size]