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Long QT syndrome. Why does sex matter?
S Kääb1, A Pfeufer, M Hinterseer
1LMU München, Klinikum Grosshadern, Department of Medicine I, Marchioninistrasse 15, 81377 München, Germany. Stefan.Kaab@med.uni-muenchen.de
Zeitschrift Fur Kardiologie
|September 15, 2004
Summary
Women face double the risk of arrhythmias from QT prolonging drugs due to gender-specific cardiac repolarization. This highlights the need for specialized attention to drug-induced QT prolongation in women.
Area of Science:
- Cardiology
- Pharmacology
- Genetics
Background:
- Cardiac function is significantly influenced by gender, particularly in cardiac repolarization.
- Gender differences in QT and QTc intervals vary throughout life, influenced by sex hormones affecting myocardial ion channel gene expression.
Purpose of the Study:
- To investigate gender-specific differences in cardiac repolarization and arrhythmia risk.
- To examine the impact of QT prolonging drugs and familial long QT syndrome on women compared to men.
Main Methods:
- Analysis of surface ECG data to assess QT and QTc intervals.
- Review of studies on drug-induced QT prolongation and familial long QT syndrome.
- Genotype-specific subgroup analysis for familial long QT syndrome.
Main Results:
- Women exhibit a doubled risk of arrhythmias associated with QT prolonging drugs compared to men.
- No conclusive gender effects on disease onset or mortality in familial long QT syndrome.
- Female patients with LQT2 locus mutations show a higher risk.
Conclusions:
- Sex hormones play a crucial role in gender differences in cardiac repolarization.
- Women require special attention regarding drug-induced QT prolongation due to increased arrhythmia risk.