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Eur J Cardiothorac Surg 2004;25:791-800
© 2004 Elsevier Science NL

Evaluation of brain injury after coronary artery bypass grafting. A prospective study using neuropsychological assessment and diffusion-weighted magnetic resonance imaging

^a Department of Thoracic and Cardiovascular Surgery, University Hospital, Essen, Germany
^b Department of Neurology, University Hospital, Essen, Germany
^c Institute of Diagnostic and Interventional Radiology, University Hospital, Essen, Germany

Received 27 October 2003; received in revised form 2 February 2004; accepted 4 February 2004.

^* Corresponding author. Department of Thoracic and Cardiovascular Surgery, West German Heart Center, University of Essen, Hufelandstrasse 55, 45122 Essen, Germany. Tel.: +49-201-723-4901; fax: +49-201-723-5451
e-mail: stephan.knipp{at}uni-essen.de

Objective: Neurocognitive dysfunction is a common complication after cardiac surgery with cardiopulmonary bypass (CPB). Studies using magnetic resonance imaging (MRI) have demonstrated that new focal brain lesions can occur after coronary artery bypass grafting (CABG), even in patients without apparent neurological deficits. Diffusion-weighted MRI is superior to conventional MRI and allows for sensitive and early detection of ischemic brain lesions. We prospectively investigated cerebral injury early and 3 months after CABG using diffusion-weighted MRI and related the findings to clinical data and neurocognitive functions. Methods: Twenty-nine patients [67.6±8.6 (52–85) years, 5 females] undergoing elective CABG with CPB were examined before surgery, at discharge and 3 months after surgery. A battery of standardized neuropsychological tests and questionnaires on depression and mood were administered. Conventional and diffusion-weighted MRI of the brain was performed and new lesions were analyzed. Clinical characteristics, neuropsychological test performance and radiographic data were collected and compared. Results: There was no major neurological complication after CABG. Thirteen patients (45%) exhibited 32 new ischemic lesions on postoperative diffusion-weighted MRI. The lesions were small, rounded and equally dispersed in both hemispheres. Eight patients had at least two lesions. At discharge, significant deterioration of neuropsychological performance was observed in 6 of the 13 tests compared to baseline assessment. By 3 months postoperatively, 5 of the 6 tests returned to preoperative levels. Verbal learning ability, however, remained impaired. The presence of new focal brain lesions was not associated with impaired neuropsychological performance. There was also no correlation between clinical variables, intraoperative parameters and postoperative complications and MRI findings. Conclusions: Although neurocognitive decline after CABG is mostly transient, memory impairment can persist for months. New ischemic brain lesions on postoperative diffusion-weighted MRI do not appear to account for the persistent neurocognitive decline.

Key Words: Cardiopulmonary bypass • Cognitive function • Coronary artery bypass grafting • Magnetic resonance imaging • Neuropsychology

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