Abstract 2417: Baseline Factors Predicting Physical Activity in Coronary Artery Bypass Patients at Different Time Intervals 6 Months After Surgery.
Physical activity levels are important indicators of improved cardiovascular functioning following coronary artery bypass graft (CABG) surgery. The purpose of this descriptive study was to determine preoperative baseline factors that predict physical activity in the CABG patient during the first 6 months after surgery.
Method: The sample included 232 patients, 65 years or older, who had undergone CABG surgery. The subjects’ mean age was 71 (4.9), ranging from 65– 86 years. The majority were men (83 %), married (86%), and had a mean education level of 13 years of school. Stepwise multiple regressions were conducted at 4 follow-up times (3 and 6 weeks, and 3 and 6 months) on two physical activity variables: estimated energy expenditure (EEE) and average activity counts. The RT3® accelerometer was worn for 3 consecutive days at each time period. Preoperative measures included patient demographics, Medical Outcomes Study short form 36 (MOS SF-36), Hospital Anxiety and Depression Scale (HADS), RISKO Heart Hazard Appraisal, and Duke Activity Status Index (DASI).
Results: Multiple Regressions with significant predictors are presented for each variable at each time frame. R2 ranged from .24 – .38 for the 8 regression models. The highest R2.38 model was at 3 weeks for EEE and significant baseline predictors were: age, gender, physical functioning (MOS SF-36), depression (HADS), functional capacity (DASI), body mass index (BMI), and composite CAD risk burden (RISKO).
Findings: Age was a consistent predictor at all times, on both EEE and activity counts. Depression scores, BMI and gender were significant predictors for most of the time periods on both EEE and activity counts.
Implications: Many perioperative and other postoperative factors can certainly impact physical activity following CABG surgery. However, consideration of preoperative factors which are associated with recovery can help clinicians plan interventions for targeting vulnerable patients at time of discharge. Targeting CABG patients in need of specific information, strategies and interventions to increase their physical activity after surgery is warranted.