QT Dispersion and Left Ventricular Hypertrophy in Elderly Hypertensive and Normotensive Patients

Abstract

Inhomogeneity of ventricular repolarization as detected by QT dispersion may be a potential leading mechanism of sudden death in hypertensive and normotensive (age related) left ventricular hypertrophy. Aim of this study was to investigate QT dispersion, ventricular arrhythmias, and left ventricular mass index in elderly hypertensive and normotensive patients. Study population consisted of 60 consecutive patients (sex: 34 men/26 women; age: 63 ± 11 years) with essential arterial hypertension and 48 age and sex-matched control subjects (24 men/24 women; 64 ± 16 years). Measurements included QTc dispersion, ventricular arrhythmias, and left ventricular hypertrophy. Hypertensive patients had greater left ventricular mass index ( P = .006) and higher QTc dispersion ( P = .004) than controls. Left ventricular hypertrophy was diagnosed in 57 (31 men/26 women) of all subjects. These patients had higher blood pressure ( P < .05), Lown's score ( P < .001), and QTc dispersion ( P < .001). QTc dispersion and Lown's score were independent predictors of left ventricular mass index ( P < .001). Conclusively, QTc dispersion is a strong indicator of left ventricular mass index and might be used in risk stratification of hypertensive and normotensive elderly patients.