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Atrial APD alternans is increased by MI. (A) Original optical recording of an AP train (5 Hz pacing) from intact rabbit LA, post-ventricular MI, showing AP alternans. APD alternans magnitude in unpaced (B) and 5 Hz-paced (C) hearts, measured at 50% (i), 75% (ii), and 90% (iii) repolarization. n = 13 non-MI hearts, 12 MI.
