title: Effect of obesity and weight loss on ventricular repolarization: a systematic review and meta-analysis.
abstract: We performed a systematic review and meta-analysis of the effects of obesity ± overweight and weight loss on the corrected QT interval (QTc) and QT or QTc dispersion (indices of ventricular repolarization). Mean difference for both QTc and QT or QTc dispersion with 95% confidence intervals (CIs) was calculated comparing obese ± overweight subjects and normal weight controls and QTc and QT or QTc dispersion before and after weight loss from diet ± exercise or bariatric surgery. A total of 22 studies fulfilled the selection criteria. Compared with normal weight controls, there was a significantly longer QTc in obese ± overweight subjects (mean difference of 21.74 msec, 95% CI: 18.76 to 22.32) and significantly longer QT or QTc dispersion (mean difference of 15.17 msec, 95% CI: 13.59 to 16.74). Weight loss was associated with a significant decrease in QTc (mean difference -25.77 msec, 95% CI: -28.33-23.21) and QT or QTc dispersion (mean difference of -13.46 msec, 95% CI: -15.60 to -11.32 in obese ± overweight subjects. Thus, obesity ± overweight is associated with significant prolongation of QTc and QT or QTC dispersion. Weight loss in obese ± overweight subjects produces significant decreases in these variables. © 2016 World Obesity.
authors.affiliation: Division of Cardiovascular Medicine, University of Missouri School of Medicine, Columbia, MO, USA.
authors.forename: J
authors.initials: J
authors.lastname: Omran
authors.affiliation: Division of Cardiovascular Medicine, University of Missouri School of Medicine, Columbia, MO, USA.
authors.forename: B
authors.initials: B
authors.lastname: Firwana
authors.affiliation: Division of Cardiovascular Medicine, University of Missouri School of Medicine, Columbia, MO, USA.
authors.forename: S
authors.initials: S
authors.lastname: Koerber
authors.affiliation: Division of Cardiovascular Medicine, University of Missouri School of Medicine, Columbia, MO, USA.
authors.forename: B
authors.initials: B
authors.lastname: Bostick
authors.affiliation: Division of Cardiovascular Medicine, University of Missouri School of Medicine, Columbia, MO, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Alpert
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000517:prevention & control*; D050110:Bariatric Surgery; D004032:Diet; D004562:Electrocardiography; D015444:Exercise; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D009765:Obesity / Q000628:therapy*; D050177:Overweight / Q000628:therapy; D018754:Ventricular Dysfunction / Q000503:physiopathology; D015431:Weight Loss
keywords: Meta-analysis; QTc; obesity; weight loss