ARDC Research Link Australia

ORCID Profile
Orcid icon. 0000-0002-2588-328X

Current Organisations
AZCERT , The University of Arizona College of Medicine Phoenix

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Publications

Publication

Investigation of potential mechanisms of sex differences in quinidine-induced torsade de pointes risk

Publisher: Elsevier BV

Date: 07-2015

DOI: 10.1016/J.JELECTROCARD.2015.03.011

Abstract: The electrocardiographic index Tpeak-Tend has been proposed as a marker of dispersion of repolarization and may be a stronger predictor of torsade de pointes risk than QTc prolongation. We assessed whether quinidine-induced Tpeak-Tend prolongation is greater in women than men. The relationship between QTc prolongation and quinidine concentration was greater in women than men (38 ± 10 vs. 28 ± 9 ms/μg/ml, p=0.02), but there was no difference for Tpeak-Tend prolongation (39 ± 13 vs. 32 ± 13 ms/μg/ml, p=0.21). There was a delay (hysteresis) between peak concentration and both maximum QTc and Tpeak-Tend prolongation and a trend toward higher serum quinidine concentration in men than women. Analysis controlling for hysteresis showed no sex difference for QTc (55 ± 18 vs. 43 ± 19 ms/μg/ml, p=0.14), without changing the lack of sex difference with Tpeak-Tend (61 ± 22 vs. 55 ± 21 ms/μg/ml, p=0.49). Women do not have a greater quinidine-induced Tpeak-Tend prolongation than men. Sex differences in hysteresis and serum quinidine concentration in this study may have contributed to sex differences in quinidine-induced QTc prolongation.