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Ann Thorac Surg 2003;75:1550-1557
© 2003 The Society of Thoracic Surgeons
a Clinic for Cardiothoracic Surgery, Heart Institute Lahr/Baden, Lahr, Germany, Germany
b Institute of Neuroinformatics, University of Bielefeld, Bielefeld, Germany
c Department of Neurology, Regional Hospital Lahr, Lahr, Germany, Germany
Accepted for publication August 29, 2002.
* Address reprint requests to Dr Albert, Hohbergweg 2, 77933 Lahr, Germany
e-mail: alexander.albert{at}heart-lahr.com
BACKGROUND: Stroke after cardiac surgery is a devastating complication. The relationship between white blood cell count (WBC) and perioperative cerebrovascular accident (CVA) has not been investigated. An effort was made to identify how preoperative WBC may relate to CVA development during or after cardiac surgery.
METHODS: Prospective data were collected from 7,483 patients who underwent coronary artery bypass grafting or valvular surgery or both. WBC was determined preoperatively and postoperatively. Differentiation of WBC was examined only preoperatively.
RESULTS: There were a total of 125 CVAs (10 transient ischemic attacks [TIAs], 115 strokes). WBC was significantly higher preoperatively and directly postoperatively in patients with stroke. Qualitative changes in preoperative WBC were also found in these patients (
2; p < 0.001). The predictive power of the stepwise logistic regression model for CVA was greater when preoperative WBC was included. The risk for perioperative CVA increased starting at preoperative WBC of 9 x 109/L (p = 0.044) and progressed in higher WBC ranges. WBC had a significant impact on CVA outcome (analysis of variance, p = 0.001).
CONCLUSIONS: Our studies have established the correlation between high preoperative WBC and stroke during or after cardiac surgery. Furthermore, elevated preoperative WBC was related to the clinical outcome of CVA. Preoperative measures aimed at preventing or treating conditions such as infections that may cause elevated WBC may be beneficial in the prevention of stroke during or after cardiac surgery.
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