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Original Articles: Adult Cardiac

Miniaturized Cardiopulmonary Bypass and Acute Kidney Injury in Coronary Artery Bypass Graft Surgery

^a Department of Cardiac Surgery, II School of Medicine, University of Rome La Sapienza, Policlinico S. Andrea, Rome, Italy
^b Department of Nephrology, II School of Medicine, University of Rome La Sapienza, Policlinico S. Andrea, Rome, Italy

Accepted for publication March 26, 2009.

^_* Address correspondence to Dr Benedetto, Cardiac Surgery Department, II School of Medicine, University of Rome "La Sapienza," Via di Grottarossa 1039, Rome, 00181, Italy (Email: u2benedetto{at}libero.it).

Background: Acute kidney injury (AKI) is one of the most important complications after on-pump coronary artery bypass graft surgery (CABG). Miniaturized cardiopulmonary bypass (mini-CPB) systems have been developed to allow the ease of on-pump surgery but tempering the disadvantages. Whether mini-CPB reduces the incidence of AKI remains to be determined.

Methods: Using a propensity score matched analysis, we investigated the occurrence of AKI among patients undergoing CABG on mini-CPB (n = 104) versus conventional CPB (n = 601). Acute kidney injury was defined according to the recent Acute Kidney Injury Network classification.

Results: Overall, acute kidney injury developed in 274 of 705 patients (38.8%). A total of 27 of 705 patients (3.8%) required renal replacement therapy. The median postoperative length of intensive care unit stay in survivors with AKI was 5.4 (3.9 to 6.8) days compared with 2.0 (1.0 to 3.0) days for patients without AKI (p = 0.0002). The overall incidence of AKI for patients undergoing mini-CPB was 30 of 104 (28.8%) compared with 244 of 601 (40.5%) for patients undergoing conventional CPB (p = 0.03). In the propensity score matched-pair statistical analysis, mini-CPB was independently associated with a decreased incidence of AKI (adjusted odds ratio [OR] 0.61; 95% confidence interval [CI]: 0.38 to 0.97). Other variables independently associated with AKI were preoperative glomerular filtration rate (OR 0.988 for 1 mL · min^–1 · 1.73 m^–2 increase; 95% CI: 0.98 to 0.99), postoperative red blood cell transfusion (OR 1.58; 95% CI: 1.12 to 2.23); CPB time (OR 1.005 for 1-minute increase; 95% CI: 1.0 to 1.009), and postoperative low output syndrome (OR 1.72; 95% CI: 1.23 to 2.41).

Conclusions: The present study showed that mini-CPB is associated with a lower incidence of AKI when compared with conventional CPB among patients undergoing CABG.

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Invited Commentary

Vincent Chan and Marc Ruel
Ann. Thorac. Surg. 2009 88: 535-536. [Extract] [Full Text] [PDF]

This article has been cited by other articles:

				V. Chan and M. Ruel Invited commentary. Ann. Thorac. Surg., August 1, 2009; 88(2): 535 - 536. [Full Text] [PDF]