Meta-analysis of left ventricular hypertrophy and sustained arrhythmias.

Presence of left ventricular hypertrophy (LVH) has been reported to be associated with supraventricular and ventricular arrhythmias, but the association has not been systematically quantified and evaluated. A systematic search of studies in MEDLINE, EMBASE, CINAHL, Scopus, Web of Science, and Cochrane Central Register of Controlled Trials databases was undertaken through April 2014. Studies reporting on LVH and sustained arrhythmias such as atrial fibrillation and supraventricular tachycardias (SVTs) and ventricular arrhythmias (tachycardia and fibrillation) were identified. Pooled effect estimates were calculated with random-effects models (DerSimonian and Laird). A total of 10 eligible studies with 27,141 patients were included in the analysis. The incidence of SVT in patients with LVH was 11.1% compared with 1.1% among patients without LVH (p<0.001). Patients with LVH had 3.4-fold greater odds of developing SVT (odds ratio 3.39, 95% confidence interval 1.57 to 7.31) than those without LVH, although significant heterogeneity was present (I2=98%). Meta-regression analyses revealed the heterogeneity to have originated from differences in the baseline covariates such as age, male gender, hypertension, and diabetes of the individual studies. The incidence of ventricular arrhythmias was 5.5% compared with 1.2% in patients without LVH (p<0.001). The occurrence of ventricular tachycardia or fibrillation was 2.8-fold greater, in the presence of LVH (odds ratio 2.83, 95% confidence interval 1.78 to 4.51), and there was no significant heterogeneity (I2=9%). Presence of LVH in hypertensive patients is associated with a greater risk of sustained supraventricular/atrial and ventricular arrhythmias, and there is an unmet need for identifying and refining risk stratification for this group.