Cardiopulmonary bypass not induces dysrhythmia in elderly coronary artery bypass grafting patients

BACKGROUND Dysrhythmia is a serious complication associated with on-pump coronary artery bypass grafting surgery (CABG) and can yield poor prognoses after CABG surgery. In addition, affected patients may be at an increased risk of morbidity or mortality. This study evaluated on-pump CABG arrhythmogenic factors among patients who had undergone this type of surgery. METHODS This retrospective study recruited 47 patients admitted to Mackay Memorial Hospital from January to December 2015. We initially divided the patients into two groups based on age: Group I (elderly people aged ≥ 65 years old) and Group II (adults aged ≤ 64 years old). Second, we formed a relative dysrhythmia group for further analysis, which was divided into two subgroups: Group A (patients with dysrhythmia) and Group B (patients without dysrhythmia). The risks were further analzyed. RESULTS The mean age of the patients in Group I (73.25±7.17 years) was considerably higher than in Group II. The overall incidence of dysrhythmia was 33.3% in elderly patients who had undergone on-pump CABG. This study found that surgery length (213.88±59.74 min) was significantly associated with dysrhythmia. A receiver operating characteristic curve analysis revealed that a sensitivity cutoff point is obtained when the surgery period is longer than 170 min. CONCLUSIONS In this study, we demonstrated that elderly patients are a high-risk group for dysrhythmia and CPB is not related to dysrhythmia. Moreover, we demonstrated that the risk of dysrhythmia in elderly people increases when the surgery period is longer than 170 min.