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Arrhythmias were induced in isolated rat atrial muscle preparations by increasing the calcium concentration of the Ringer solution, while the potassium concentration was kept low. A rise in the resting tension occurred simultaneously. The release of aspartate aminotransferase (ASAT) from the fibrillating atria was not higher than the release from non-fibrillating atria pretreated with a calcium-antagonistic drug, nifedipine 100 microgram/l. It is suggested that calcium-induced rat atrial arrhythmias in the present experiments are caused by a direct effect on calcium influx through the excitable membrane and not as a result of myocardial lesion caused by calcium overload.
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