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From the Departments of Neurology (Drs. Blacker and Wijdicks) and Health Sciences Research (Dr. McClelland), Mayo Clinic, Rochester, MN.
Address correspondence and reprint requests to Dr. E.F.M. Wijdicks, Mayo Clinic, Department of Neurology W8B, 200 First St. SW, Rochester, MN 55905; e-mail: wijde{at}mayo.edu
Objective: To determine the risk of stroke in anticoagulated patients with atrial fibrillation (AF) when anticoagulation is adjusted for bronchoscopy, gastroscopy, or colonoscopy, and to identify factors that could modify this risk.
Methods: The authors reviewed patients with AF undergoing endoscopies between 1995 and 2001, with specific analysis of patients with AF in whom anticoagulation was adjusted for the procedures. The authors calculated the stroke rate within 30 days of the procedures.
Results: Twelve strokes occurred in 987 patients undergoing 1,137 procedures (1.06%/procedure). The risk ranged from 0.31% for patients with nonvalvular AF undergoing routine procedures to 2.93% for complex patients undergoing endoscopies combined with other procedures or with comorbid illnesses. Patients with stroke were more likely to be complex (7/12 vs 219/975, p = 0.04); to be older than 80 years (6/12 vs 187/975, p = 0.017); to have a history of stroke (7/12 vs 194/975, p = 0.004), hypertension (10/12 vs 508/975, p = 0.04), or hyperlipidemia (9/12 vs 334/975, p = 0.005); or to have a family history of vascular disease (10/12 vs 502/975, p = 0.039).
Conclusions: The risk of stroke in patients with AF whose anticoagulation is adjusted for endoscopies is low, but almost tenfold higher in patients with complex clinical situations. Age, history of stroke, hypertension, hyperlipidemia, and family history of vascular disease may increase the risk of stroke.
Received February 10, 2003. Accepted in final form June 23, 2003.
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