Simple heart rate and QT parameters during stress exercise testing to assess presence and severity of stable coronary artery disease.

The relationship between QT prolongation and myocardial ischemia is well known, however not many studies have correlated corrected QT interval and heart rate recovery with the severity of coronary artery disease (CAD). This was a single-center, prospective, observational study which included 127 patients with CAD and 124 patients without CAD. Corrected QT variability from peak to recovery correlated well with CAD with a p value of 0.