The 3D heart at the right can be rotated using the mouse to view the arrhythmia in more detail.

ECG rhythm strip, Lead II, 25 mm/sec, 10mm/mV. The ECG shows a regular saw-tooth pattern of atrial flutter waves (arrows) at a rate of 430 BPM, with a ventricular response rate of 130 BPM. Atrial flutter waves are characterized by the absence of isoelectric (or flat) intervals between atrial activations.