Background: The number of renal transplant survivors requiring surgical treatment for cardiovascular diseases is increasing. A retrospective study was conducted to determine the outcomes of renal transplant recipients undergoing cardiac surgery.
Methods: Fifty-seven renal transplant recipients whose cardiac surgery was performed between 1987 and 2004, and whose allograft was functioning at the time of cardiac surgery, were identified. We analyzed postoperative mortality and morbidity as well as late mortality.
Results: Among 57 patients, 70.2% had hypertension, 54.4% diabetes, and 28.1% poor left ventricular function (ejection fraction < 0.35). Preoperative renal insufficiency (serum creatinine level > or = 3 mg/dL) was noted in 12.3% of the patients. Coronary artery disease was the dominant indication for the surgery. The median interval from renal transplant to cardiac surgery was 60 months. In-hospital mortality was 5.3%. All deaths were cardiac-related. Infectious complications occurred in 17.5% of the patients. Acute allograft failure requiring hemodialysis occurred in 28.6% of the patients with preoperative renal insufficiency, more frequent than those without preoperative renal insufficiency. Multivariable analysis identified preoperative renal insufficiency, mitral valve disease, and left ventricular dysfunction as independent predictors of in-hospital major adverse events (including death, infection, and renal failure). The 3-year survival was 71% after a median follow-up of 34 months.
Conclusions: Infection control and renal protection should be stressed to ensure the safety of cardiac surgery in this patient group, while preoperative renal insufficiency, mitral valve disease, and left ventricular dysfunction are associated with early adverse outcomes. In the renal transplant recipients undergoing an isolated CABG, avoidance of cardiopulmonary bypass and use of arterial grafts might lead to better outcomes.