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The time course of the protective effect of 7-oxo-prostacyclin (7-oxo-PGI2) treatment on changes of atrial and ventricular electrical fibrillation (atrial fibr and ventr fibr) threshold in anesthetized cats. 7-oxo-PGI2 significantly increased ventricular fibrillation threshold 24 h, 48 h and 72 h after 7-oxo-PGI2 treatment. The atrial fibrillation threshold was markedly increased 48 h and 72 h after drug administration. *Significantly different from control values at P<0.01
