risk of mortality, due largely to an increased risk of cardiovascular disease. Almost half of patients with type 1 diabetes have a prolonged QTc interval (> 440 ms). Diabetes with a prolonged QTc interval was associated with a 29% mortality over 10 years in comparison to 19% with a normal QTc interval. Anti-hypertensive drugs increased the QTc interval, but were not an independent predictor of mortality. Type 2 diabetes QT interval dispersion (QTd) is the maximum QT interval minus the minimum QT interval, and is linked with ventricular repolarization. A QTd over 80 ms is considered abnormally prolonged. Increased QTd is associated with mortality in type 2 diabetes. QTd is a better predictor of cardiovascular death than QTc, which was unassociated with mortality in type 2 diabetes. QTd higher than 80 ms had a relative risk of 1.26 of dying from cardiovascular disease compared to a normal QTd. See also Electrocardiogram Long QT syndrome Short QT syndrome QT interval variability References External links Cardiac safety section in the Biopharmaceutical network Corrected QT interval calculation Comprehensive QTc Calculator with 5 formulas at TheCalculator.co All pages needing factual verification Wikipedia articles needing factual verification from August 2016 Cardiac electrophysiology