PMID: 9650155Jul 3, 1998Paper

Female gender as a risk factor for drug-induced cardiac arrhythmias: evaluation of clinical and experimental evidence

Journal of Women's Health
S N EbertR L Woosley

Abstract

One of the most pronounced gender-based differences in response to drugs is women's far greater risk of developing the life-threatening ventricular arrhythmia called torsades de pointes (TdP). A review of the literature and databases of the Food and Drug Administration reveals that a much higher percentage of women than men develop TdP arrhythmias after taking a variety of drugs, such as antihistamines (terfenadine, astemizole), antibiotics (erythromycin), antimalarials (halofantrine), antiarrhythmics (quinidine, d-sotalol), and miscellaneous other drugs. All of these drugs have in common the ability to block potassium currents, thereby prolonging cardiac repolarization and the QT interval on the ECG. The available experimental data support the hypothesis that gender differences in specific cardiac ion current densities are responsible, at least in part, for the greater susceptibility of females for developing TdP arrhythmias. In isolated perfused rabbit hearts (Langendorff technique), female rabbit hearts display greater baseline and drug-induced (quinidine and d-sotalol) changes in QT intervals than male hearts, and at least two different repolarizing potassium current densities (IKr and IKl) are found to be significantly low...Continue Reading

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