Six Minute Walking Test As Predictor For Mortality and Rehospitalization Within 3 Months In Post Coronary Bypass Surgery Patients

Abstract

Background: Patients underwent Coronary Artery Bypass Surgery are at risk of developing post-operative complications that affect length of stay, re-hospitalization and increase in mortality rate. Impaired functional capacity is associated with poor outcomes in patients after CABG. The Six Minute Walk Test (6MWT) is generally used to evaluate functional capacity before cardiac rehabilitation and to prescribe the intensity of exercise training. The six minute walk test (6MWT) is a simple test and has been used in heart failure patients to assess exercise tolerance, the effects of therapy and prognosis. This study is to investigate the relationship between the distance of 6MWTwith re- hospitalization and mortality rate in post coronary artery bypass surgery patients.Method: This is a retrospective cohort study conducted at Cardiac Centre of Adam Malik Hospital. Subjects of the study consists of 104 patients underwent coronary bypass surgery between January 2019 until February 2020. 6MWT is performed before the patient discharge. Rates of re-hospitalisation and mortality were observed during 3 months of follow-up. The distance walk during 6MWT was compare to rate of rehospitalization and cardiac mortality. Result: Total of 104 patients (91 males, mean age 57,4±5,7 years). Six patients died (5,8%) of cardiovascular cause and 18 (17,3%) were rehospitalized. Significant relationship was found between the distance of 6MWT and incidence of mortality and re-hospitalization (p <0.001). Patients with 6MWT <250 meters had a higher risk of re-hospital compared to those with 6MWT >250 meters with RR 16.74 (95% CI: 2.53-110.78) and p = 0.008. Conclusion: The six minute walk test (6MWT) is a predictor of re-hospitalization in patients post CABG. Patients who walked in shorter distance group <250 meters would increase risk of re-hospitalization rate 16.74 greater than patients with distances >250 meters. Keywords: 6MWT; CABG; rehospitalization; mortality