Arsenic metabolism, lactate dehydrogenase and electrocardiogram abnormality among residents in the arseniasis-endemic areas of southwestern Taiwan

A total of 380 residents from three tap water implemented villages of previous arseniasis-hyperendemic regions in Taiwan and 303 age-and sex-matched residents from a nearby control area, having no documented arsenic exposure, were

of atrial depolarization to the onset of ventricular depolarization), QRS (the time for depolarization of the ventricles), QT (the time of ventricular depolarization and repolarization), JT (the time from the end of ventricular depolarization to the end of the ventricular repolarization) and heart rate corrected indices of QT and JT. ECG readings were then classified according to the definition of cardiac function by myocardial infarction or ischemia, conduction defect, arrhythmias, atrial enlargement or ventricular hypertrophy, and prolonged ventricular repolarization.