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Ann Thorac Surg 2005;79:2024-2031
© 2005 The Society of Thoracic Surgeons
Department of Cardiothoracic Surgery, St. George’s Hospital, London, United Kingdom
Accepted for publication December 20, 2004.
* Address reprint requests to Dr Chandrasekaran, Department of Cardiothoracic Surgery, St. George’s Hospital, Blackshaw Road, London SW17 0QT, United Kingdom (E-mail: v.chandrasekaran{at}stgeorges.nhs.uk).
BACKGROUND: Cardiopulmonary bypass (CPB) is often associated with renal dysfunction, as measured by plasma creatinine levels and hemodialysis rates. This study compared creatinine clearance (CrCl), estimated with the Cockroft and Gault formula, between patients undergoing off-pump coronary artery bypass grafting (OPCAB) versus on-pump CABG (on-CAB).
METHODS: Data of 704 consecutive patients were analyzed. Of these patients, 404 underwent OPCAB while 300 had on-CAB. Creatinine clearance, plasma creatinine levels, and clinical outcome were compared between groups. Data between patients who developed new renal impairment, compared to patients with normal postoperative renal function, were also analyzed.
RESULTS: Creatinine clearance (preoperative, 74 ± 25 vs 78 ± 29 mL/min; day 1, 74 ± 26 vs 76 ± 31 mL/min; day 4, 70 ± 26 vs 72 ± 29 mL/min) and creatinine levels (preoperative, 99 ± 25 vs 95 ± 27 µmol/L; day 1, 101 ± 29 vs 104 ± 35 µmol/L; day 4, 110 ± 44 vs 113 ± 60 µmol/L), as well as postoperative complications (stroke 1% vs 1%; hemofiltration 1.5% vs 3.7%; death 1.2% vs 2.3%), were overall similar between OPCAB and on-CAB patients. Patients with preoperative CrCl less than 50 mL/min had higher creatinine levels in the on-CAB group on day 1 (p = 0.026), although CrCl was similar between groups. Development of new CrCl less than 50 mL/min postoperatively was associated with higher rates of intraaortic balloon pump insertion, re-sternotomy, hemofiltration, intensive care and hospital stay, without difference between groups. Female sex, low body mass index, high preoperative creatinine levels, and advanced age were associated with deterioration in CrCl.
CONCLUSIONS: Currently, the rate of renal impairment is low after both OPCAB and on-CAB. No significant difference in CrCl could be demonstrated between groups. Deterioration in renal function is associated with higher rates of postoperative complications.
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