Aim: In coronary artery bypass surgery patients length of stay in intensive care unit (ICU) has an important role in complication rates and costs. For that reason, the discharging of the patients from the hospital in shorter period can be provided by taking measures prior to surgical intervention via previously known factors which may affect hospitalization stay. The aim of this study was to determine the role of perioperative risk factors in term of clinical outcomes based on the time of ICU discharge. Material and Method: In this retrospective study, we included 196 patients undergoing coronary artery bypass graft surgery in our clinic. The patients were divided into early (<= 2 day) and late (>2 day) ICU discharge groups according to the duration of ICU stay. The preoperative and postoperative risk factors, the complications and the outcomes were evaluated. Results: Age, sex, hyperlipidemia, diabetes mellitus, previous myocardial infarction, renal failure, cerebrovascular accident, hypertension, level of hematocrit and creatinine were not significantly different between the two groups. Patients with hemodynamic instability, respiratory dysfunction, ejection fraction <35%, inotrope administration, left main coronary artery disease, use of intraaortic balloon pump and arrhythmia had significantly longer length of stay in ICU (>2 day) compared to other group (p<0.05). The shorter duration of intubation time was the most significant factor affecting early discharge according to late discharge group (7.8 +/- 3.8 vs 17 +/- 9.9 hours, p<0.001). Discussion: Time of ICU discharge depends on especially to respiratory dysfunction and duration of intubation. Therefore, we assume that modification of preoperative risk factors for respiratory may improve clinical outcomes in ICU.