Study Population
The present study was a quantitative research approach with a cross-sectional study design. Patients were recruited from the Cardiothoracic and Neurosciences Centre (CNC) out-patient department at the All India Institute of Medical Sciences, New Delhi which is a tertiary-care referral centre in North India. Individual informed consent was obtained from all the participants at enrolment in the study. Data was collected during hospital admission, two to seven days prior to elective CABG surgery. One hundred and twenty-one patients were included in the study. Study population included patients between 35 to 65 years of age with established CAD (double or triple vessel disease) planned for elective CABG surgery. Patients undergoing emergency CABG surgery or CABG surgery with valve replacement, patients with LV dysfunction (LVEF < 30%), renal dysfunction and known neuropsychiatric illnesses were excluded from the study. Baseline demographic and clinical data was obtained from all the patients.