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• W2318753899 abstract "Women are known to have a longer QT interval than men and a greater propensity toward drug-induced torsades de pointes (TdPs). However, little is known about these sex differences in isolated cardiac tissues. We evaluated potential sex differences in repolarization in isolated rabbit Purkinje fibers using a microelectrode technique. Isolated male or female Purkinje fibers were perfused in a Tyrode's solution with solvent, dofetilide (1 x 10(-8) M) or quinidine (1 x 10(-5) M), and stimulated at 1 or 0.2 Hz. Female Purkinje fibers with solvent (n = 11) tended to have a longer duration of the action potential at 90% repolarization (APD90) than male fibers with solvent (n = 10): 331 (median) vs. 272 ms at 1 Hz (p > 0.05); 473 vs. 367 ms at 0.2 Hz (p < 0.05). Dofetilide (1 x 10(-8) M) significantly increased APD90 more in female Purkinje fibers (n = 11) than in male fibers (n = 10): 670 vs. 385 ms at 1 Hz, at 20 min after the infusion (p < 0.05), and 1,000 vs. 937 ms at 0.2 Hz at the end of the 25-min infusion (p < 0.05), respectively. Quinidine (1 x 10(-5) M) tended to increase APD90 more in female Purkinje fibers (n = 11) than in male fibers (n = 10): 705 vs. 500 ms at 1 Hz, at 20 min after the infusion (p > 0.05). Furthermore, dofetilide (1 x 10(-8) M) and quinidine (1 x 10(-5) M) elicited a higher incidence of early afterdepolarizations in female Purkinje fibers than in male fibers at 0.2 Hz (100 vs. 60%, p < 0.05; and 91 vs. 50%, p > 0.05). Our data indicate that female Purkinje fibers tend to have longer ventricular repolarization and are at higher risk of drug-induced early afterdepolarizations at a slow stimulation rate than male fibers. This may contribute to a sex difference in QT interval and to a greater tendency on the part of women to the development of drug-induced TdPs." @default.
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• W2318753899 date "2000-07-01" @default.
• W2318753899 modified "2023-10-17" @default.
• W2318753899 title "Are There Sex-Specific Differences in Ventricular Repolarization or in Drug-Induced Early Afterdepolarizations in Isolated Rabbit Purkinje Fibers?" @default.
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• W2318753899 doi "https://doi.org/10.1097/00005344-200007000-00018" @default.
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