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J Thorac Cardiovasc Surg 2001;121:1083-1089
© 2001 The American Association for Thoracic Surgery
Surgery for Acquired Cardiovascular Disease |
From the Department of Cardiothoracic Surgery, Imperial College School of Medicine, University of London, Hammersmith Hospital, London, United Kingdom.
Received for publication May 26, 2000. Revisions requested Aug 28, 2000;.revisions received Oct 20, 2000. Accepted for publication Nov 16, 2000. Address for reprints: Arjuna Weerasinghe, Department of Cardiothoracic Surgery, University of London, Hammersmith Hospital, London W12 OHS, United Kingdom (E-mail: aweerasinghe{at}ic.ac.uk).
Objectives: The effect of mild-to-moderate elevation of preoperative serum creatinine levels on morbidity and mortality from coronary artery bypass grafting has not been investigated in a large multivariable model incorporating preoperative and intraoperative variables. Our first objective was to ascertain the effect of a mild-to-moderate elevation in the preoperative serum creatinine level on the need for mechanical renal support; the duration of special care and total postoperative stay; the occurrence of infective, respiratory, and neurologic complications; and hospital mortality. Our second objective was to ascertain which patient variables contributed to an increase in the serum creatinine level in association with coronary artery bypass grafting.
Methods: A total of 1427 patients who had no known pre-existing renal disease and who were undergoing first-time coronary artery bypass grafting with cardiopulmonary bypass were recruited for the study. Patients were divided, on the basis of preoperative serum creatinine level, into 3 groups as follows: creatinine level of less than 130 µmol · L–1; creatinine level of 130 to 149 µmol · L–1; and creatinine level of 150 µmol · L–1 or greater. A multivariable stepwise logistic regression analysis was used, and variables significant at the 5% level were included when developing the final multivariable models.
Results: Multivariable analysis showed that elevation of the preoperative serum creatinine level to 130 µmol · L–1 or greater increased the likelihood of needing mechanical renal support postoperatively (P < .001), as well as the need for postoperative special care (P < .001) and total hospital stay (P < .001). In-hospital mortality was also significantly elevated as the preoperative creatinine level rose to 130 to 149 µmol · L–1 (P = .045) and to 150 µmol · L–1 or greater (P < .001). It was further observed that patients with preoperative serum creatinine levels of 130 to 149 µmol · L–1 (P = .02), patients with preoperative serum creatinine levels of 150 µmol · L–1 or greater (P = .001), hypertensive patients (P = .007), patients with angina of New York Heart Association class III or greater (P = .001), patients having a nonelective operation (P = .002), and patients having a prolonged cardiopulmonary bypass time (P = .008) had a significantly greater increase in the serum creatinine level as a result of coronary artery bypass grafting. Of particular note was the finding that the method of myocardial protection (cardioplegia or crossclamp fibrillation) did not significantly influence in-hospital mortality, need for mechanical renal support, or special care or total postoperative hospital stay.
Conclusions: A mild elevation (130-149 µmol · L–1) in the preoperative serum creatinine level significantly increases the need for mechanical renal support, the duration of special care and total postoperative stay, and the in-hospital mortality. As the preoperative serum creatinine level increases further (
150 µmol · L–1), this effect is more pronounced. No significant difference in outcome was observed between the use of cardioplegia or crossclamp fibrillation for myocardial protection.
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