[Repolarization pattern of the ventricular myocardium in pikes].

The study aimed at investigation into the repolarization pattern in the myocardium of fish. Activation times, activation-recovery intervals and repolarization times were determined in the intramural layers of the heart ventricle in eight pikes with multiple plunge electrodes. In the heart ventricle of the pike, the earliest end of repolarization was found in the subendocardium of the base and the subepicardium of the apex, the areas corresponding to the earliest and latest depolarization, respectively. The latest repolarization was observation on the anterior epicardial surface of the base. Endocardialto-epicardial repolarization sequence at the base corresponded to the activation sequence in this area with the transmural gradient of the end of repolarization times being 54 +/- 23 ms (p < 0.001). The transmural difference in activation-recovery interval durations and end of repolarization times decreased as one moved from the base to apex with the maximal apex-to-base end of repolarization gradient being 133 +/- 98 ms (p < 0.10).