Published online before print August 17, 2005, doi:10.1212/01.wnl.0000175220.78475.99)
NEUROLOGY 2005;65:991-999
© 2005 American Academy of Neurology
Is there cognitive decline 1 year after CABG?
Comparison with surgical and nonsurgical controls
G. M. McKhann, MD,
M. A. Grega, RN, MSN,
L. M. Borowicz, Jr, MS,
M. M. Bailey, BA,
S.J.E. Barry, MS,
S. L. Zeger, PhD,
W. A. Baumgartner, MD and
O. A. Selnes, PhD
From the Departments of Neurology (Drs. McKhann and Selnes) and Surgery (Dr. Baumgartner and M.A. Grega), School of Medicine; the Zanvyl Krieger Mind/Brain Institute (Dr. McKhann, L.M. Borowicz, and M.M. Bailey); and the Department of Biostatistics (Dr. Zeger and S.J.E. Barry), Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD.
Address correspondence and reprint requests to Dr. Guy M. McKhann, 338 Krieger Hall, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218; e-mail: guy.mckhann{at}jhu.edu
Background: It is widely assumed that decline in cognition after coronary artery bypass grafting (CABG) is related to use of the cardiopulmonary bypass pump. Because most studies have not included comparable control groups, it remains unclear whether postoperative cognitive changes are specific to cardiopulmonary bypass, general aspects of surgery, or vascular pathologies of the aging brain.
Methods: This nonrandomized study included four groups: CABG patients (n = 140); off-pump coronary surgery (n = 72); nonsurgical cardiac controls (NSCC) with diagnosed coronary artery disease but no surgery (n = 99); and heart healthy controls (HHC) with no cardiac risk factors (n = 69). Subjects were evaluated at baseline (preoperatively), 3 months, and 12 months. Eight cognitive domains and a global cognitive score, as well as depressive and subjective symptoms were analyzed.
Results: At baseline, patients with coronary artery disease (CABG, off-pump, and NSCC) had lower performance than the HHC group in several cognitive domains. By 3 months, all groups had improved. From 3 to 12 months, there were minimal intrasubject changes for all groups. No consistent differences between the CABG and off-pump patients were observed.
Conclusions: Compared with heart healthy controls (HHC), the groups with coronary artery disease had lower cognitive test scores at baseline. There was no evidence that the cognitive test performance of coronary artery bypass grafting (CABG) patients differed from that of control groups with coronary artery disease over a 1-year period. This study emphasizes the need for appropriate control groups for interpreting longitudinal changes in cognitive performance after CABG.
Editorial, see page 978
See also page 986
Additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the October 11 issue to find the title link for this article.
This article was previously published in electronic format as an Expedited E-Pub on August 17, 2005, at www.neurology.org.
Supported by Grant 35610 from the National Institute of Neurological Diseases and Stroke of the National Institutes of Health, Johns Hopkins Medical Institutions GCRC Grant RR00052, and the Dana Foundation.
Disclosure: The authors report no conflicts of interest.
Received February 2, 2005. Accepted in final form June 14, 2005.
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