Correlation between short-term heart rate variability and QT-Interval with left ventricular systolic function in patients with stable Coronary Artery Disease (CAD): a cross-sectional study

Background: The ischemic process in stable Coronary Artery Disease (CAD) causes cardiac remodeling and dysfunction, signaling the progress towards irreversible heart failure. Early identification for presence of Left ventricular (LV) dysfunction is important. Several methods can be used to assess LV using echocardiography, including peak Global Longitudinal Strain (GLS) ejection fraction measurements. Short-term Heart Rate Variability (HRV) QT interval are considered practical parameters electrocardiography identifying dysfunction. This study aimed determine relationship between short-term HRV with systolic function angina pectoris patients.Methods: cross-sectional was conducted Prof. Dr. R. D. Kandou Hospital, Manado, from March September 2021. All subjects who met inclusion criteria underwent a clinical history further examinations, electrocardiography, laboratory, echocardiography examinations. variables were analyzed Pearson correlation linear regression models by SPSS version 21 Windows.Results: A total 33 included mean age 62.3±8.9 years. Non-parametric analysis left showed no significant correlation. There QTc Fridericia GLS, but not (r=0.426; p=0.013). univariate Bazett GLS (Bazett B=0.036; ?=0.35; R2=0.122; p=0.046; B=0.052; ?=0.426; R2=0.181; p=0.013).Conclusion: weak moderate positive formula function. statistically variable