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(Stroke. 1999;30:514-522.)
© 1999 American Heart Association, Inc.
Original Contributions |
Cerebral Injury After Cardiac Surgery
Identification of a Group at Extraordinary Risk
From the Departments of Anesthesiology, Neurology, Surgery and Cardiology at the School of Medicine, Medical College of Virginia Campus, Richmond (R.L.W.); the Texas Heart Institute, Houston, Tex (N.A.N.); Veterans Administration Medical Center, Milwaukee, Wisc (A.A.); New York University, NY (M.S.K., K.E.M.); Kaiser Permanente Medical Center, San Francisco, Calif (G.W.R.); Duke Heart Center, Durham, NC (M.F.N.); Stanford University, Stanford, Calif (C.M.M.); the University of Pittsburgh, Pittsburgh, Pa (S.H.G.); Veterans Affairs Medical Center, San Francisco, Calif (G.M.O., D.T.M.); and the Ischemia Research and Education Foundation (C.L., D.M.B., A.H.), San Francisco, Calif.
Correspondence and reprint requests to Richard L. Wolman, MD, c/o The Editorial Office, The Ischemia Research and Education Foundation, Suite 3400, 250 Executive Park Blvd, San Francisco, CA 94134.
Background and Purpose—Cerebral injury after cardiac surgery is now recognized as a serious and costly healthcare problem mandating immediate attention. To effect solution, those subgroups of patients at greatest risk must be identified, thereby allowing efficient implementation of new clinical strategies. No such subgroup has been identified; however, patients undergoing intracardiac surgery are thought to be at high risk, but comprehensive data regarding specific risk, impact on cost, and discharge disposition are not available.
Methods—We prospectively studied 273 patients enrolled from 24 diverse US medical centers, who were undergoing intracardiac and coronary artery surgery. Patient data were collected using standardized methods and included clinical, historical, specialized testing, neurological outcome and autopsy data, and measures of resource utilization. Adverse outcomes were defined a priori and determined after database closure by a blinded independent panel. Stepwise logistic regression models were developed to estimate the relative risks associated with clinical history and intraoperative and postoperative events.
Results—Adverse cerebral outcomes occurred in 16% of patients (43/273), being nearly equally divided between type I outcomes (8.4%; 5 cerebral deaths, 16 nonfatal strokes, and 2 new TIAs) and type II outcomes (7.3%; 17 new intellectual deterioration persisting at hospital discharge and 3 newly diagnosed seizures). Associated resource utilization was significantly increased—prolonging median intensive care unit stay from 3 days (no adverse cerebral outcome) to 8 days (type I; P<0.001) and from 3 to 6 days (type II; P<0.001), and increasing hospitalization by 50% (type II, P=0.04) to 100% (type I, P<0.001). Furthermore, specialized care after hospital discharge was frequently necessary in those with type I outcomes, in that only 31% returned home compared with 85% of patients without cerebral complications (P<0.001). Significant risk factors for type I outcomes related primarily to embolic phenomena, including proximal aortic atherosclerosis, intracardiac thrombus, and intermittent clamping of the aorta during surgery. For type II outcomes, risk factors again included proximal aortic atherosclerosis, as well as a preoperative history of endocarditis, alcohol abuse, perioperative dysrhythmia or poorly controlled hypertension, and the development of a low-output state after cardiopulmonary bypass.
Conclusions—These prospective multicenter findings demonstrate that patients undergoing intracardiac surgery combined with coronary revascularization are at formidable risk, in that 1 in 6 will develop cerebral complications that are frequently costly and devastating. Thus, new strategies for perioperative management—including technical and pharmacological interventions—are now mandated for this subgroup of cardiac surgery patients.
Key Words: cardiopulmonary bypass • cerebral embolism and thrombosis • coronary heart disease • postoperative complications
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