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Ventricular wedges were paced at a cycle length of 800 ms using bipolar electrodes in contact with the endocardial surface. After the cycle length was reduced to 250 ms for 15–30 s, the development of electrical alternans is apparent in epicardial (EPI) and midmyocardial (MID) action potentials. The tension recording exhibits mechanical alternans, and ST-T wave alternans can be seen in the electrocardiographic (ECG) trace.
