HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Personal Folders Download to citation manager Author home page(s): Charles D. Collard Permission Requests Google Scholar Articles by Tolpin, D. A. Articles by Pan, W. PubMed Articles by Tolpin, D. A. Articles by Pan, W. Related Collections Cardiac - other Coronary disease

J Thorac Cardiovasc Surg 2009;138:873-879
© 2009 The American Association for Thoracic Surgery

Acquired Cardiovascular Disease

Obesity is associated with increased morbidity after coronary artery bypass graft surgery in patients with renal insufficiency

^a Department of Anesthesiology, Baylor College of Medicine, Houston, Tex
^b Division of Biostatistics and Epidemiology, Texas Heart Institute, St Luke's Episcopal Hospital, Houston, Tex

Received for publication March 3, 2008; revisions received November 4, 2008; accepted for publication February 2, 2009.

^_* Address for reprints: Wei Pan, MD, Baylor College of Medicine, Division of Cardiovascular Anesthesiology at the Texas Heart Institute, St Luke's Episcopal Hospital, 6720 Bertner Ave, Room 0520, Houston, TX 77030. (Email: wpan{at}heart.thi.tmc.edu).

Objective: Although obesity is a major risk factor for cardiovascular disease, it is not clear whether obesity increases the risk of postoperative morbidity and mortality in patients undergoing coronary artery bypass grafting surgery. Increasing evidence suggests that both obesity and renal insufficiency are associated with increased systemic inflammation, thrombogenicity, and endothelial dysfunction. Cardiac surgical patients with comorbid obesity and renal insufficiency might thus be at greater risk for systemic proinflammatory and thrombotic states, which in turn might increase the risk of adverse perioperative outcomes. We investigated the influence of obesity on adverse postoperative outcomes after coronary artery bypass grafting surgery in patients with and without renal insufficiency.

Methods: A retrospective cohort study was performed of patients (n = 10,863) undergoing primary coronary artery bypass grafting surgery with cardiopulmonary bypass between January 1995 and June 2005. Patients with preoperative renal insufficiency (n = 1385) and patients with preoperative normal renal function (n = 9478) were further classified as obese (body mass index, 30 kg/m²) or nonobese (body mass index, 18.5–29.9 kg/m²). Multivariate, stepwise logistic regression was performed, controlling for demographic factors, medications, and perioperative risk factors to determine whether obesity is independently associated with an increased risk of adverse postoperative outcomes after coronary artery bypass grafting surgery in patients with or without renal insufficiency.

Results: Obese patients with preoperative renal insufficiency had higher rates of postoperative myocardial infarction (5.9% vs 3.4%) and low cardiac output syndrome (24.5% vs 18.6%) and increased hospital stay (14.9 ± 13.7 vs 13.2 ± 13.0 days) than nonobese patients with preoperative renal insufficiency (all outcomes, P < .05). Multivariate analysis revealed that obese patients with preoperative renal insufficiency were independently associated with an increased risk of postoperative myocardial infarction (odds ratio, 1.82; 95% confidence interval, 1.07–3.07; P < .05) and low cardiac output syndrome (odds ratio, 1.53; 95% confidence interval, 1.15–2.03; P < .01) and increased hospital stay (P < .05). In contrast, obese patients with normal preoperative renal function were independently associated only with an increased risk of postoperative sternal wound infection (odds ratio, 2.55; 95% confidence interval, 1.40–4.67; P < .01) and leg wound infection (odds ratio, 2.27; 95% confidence interval, 1.71–3.02; P < .01).

Conclusion: Obesity is an independent risk factor for increased cardiovascular morbidity and prolonged hospital stay in patients with preoperative renal insufficiency undergoing primary coronary artery bypass grafting surgery.