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The objective of this study was to compare the immediate post-operative outcome of two myocardial protection strategies. Data of consecutive elective first time coronary artery bypass grafting (CABG) were analysed: Group A (n=671, antegrade-retrograde cold St Thomas blood cardioplegia) and Group B (n=783, intermittent cross-clamp fibrillation). Age, angina class, myocardial infarction (MI), pre-operative rhythm, respiratory disease, smoking, diabetes mellitus (DM), hypertension (HT), renal function, cerebrovascular disease, body mass index (BMI) and Parsonnet score were comparable. Significant differences existed in gender (P=0.02), peripheral vascular disease (PVD) (P=0.04), heart failure class (P=0.0001), left ventricular (LV) function (P=0.01), disease severity (P=0.02), left main stem (LMS) (P=0.02) and preinduction intra-aortic balloon pump(IABP) (P=0.08). Group A had more grafts (P=0.008), longer bypass (P=0.0001) and cross-clamp time (P=0.0001). Post-operative inotrope, MI, arrhythmias, neurological, renal complications, multi-organ failure, sternal re-wiring, ventilation, length of stay and mortality were comparable. There was higher IABP usage and longer intensive therapy unit (ITU) stay (P=0.01) in Group B. Chronic obstructive airway disease (COAD), renal dysfunction, cross-clamp time, bypass time, post-operative inotrope or IABP and re-exploration predicted longer ITU stay. Intermittent cross-clamp fibrillation is a versatile and cost-effective method of myocardial protection, with the immediate post-operative outcome comparable to antegrade-retrograde cold St Thomas blood cardioplegia in elective first-time CABG.

interactive cardiovascular and thoracic surgery

Comparison of the immediate post-operative outcome of two different myocardial protection strategies: antegrade–retrograde cold St Thomas blood cardioplegia versus intermittent cross-clamp fibrillation