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Alteration of electrophysiological parameters by CO. Effects of CO (10-4 - 10-3M) on APD and cycle length (CL) in (a) spontaneously beating atrial preparations, (b) paced atrial preparations and (c) paced ventricular preparations. The control values of APD50, APD90 and CL were considered as 100%. The relative values of these parameters during action of CO are presented in % of control. * - p < 0.05 versus the respective control values.
