EFFECT OF DEXMEDETOMİDİNE AND MİDAZOLAM SEDATİON ON HEART RATE VARİABİLİTY AFTER CORONARY ARTERY BYPASS GRAFT SURGERY

The parasympathetic tone reduction and sympathetic tone enhancement, which are components of the autonomic nervous system (ANS) activity, increase the likelihood of malignant arrhythmias leading to ventricular fibrillation. Malignant arrhythmias are associated with high mortality and morbidity after coronary artery bypass graft (CABG) surgeries. Heart rate variability (HRV) is a physiological indicator of the effects of ANS activity on heart rate and is associated with a prognostic value for cardiac mortality. Dexmedetomidine has been shown to improve myocardial perfusion, reduce arrhythmia incidence, reduce inflammatory response, and reduce mortality in patients with coronary artery disease. The aim of this study investigate the effects of dexmedetomidine electrophysiologically on cardiac autonomic system by using HRV analysis for the purpose of sedation in patients who were followed up in the intensive care unit after coronary artery bypass graft surgery