FIGURE 3.

Foal 1, Day 2, at time of conversion to normal sinus rhythm (NSR). Before conversion to NSR, intermittent flutter or p waves preceding some of the QRS complexes are noted. The atrial rhythm remained irregular with a rate of 220‐254 bpm immediately before cardioversion (red arrows). Lead II is in a base apex configuration. Lead I is a nontraditional lead and Lead III is calculated from Leads I and II. For all ECGs, the electrodes are placed around the girth area with the left leg electrode on the sternum, the left arm electrode on left side of the thorax slightly dorsal to level of the cardiac apex, the right arm electrode over the right thorax approximately 6 cm below the dorsal midline, and the right leg electrode over the left thorax approximately 6 cm below the dorsal midline.