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April 1996

Retinal Transient Ischemic Attack-Reply

Author Affiliations

Department of Epidemiology and Biostatistics North American Symptomatic Carotid Endarterectomy Trial PO Box 5015 100 Perth Dr London, Ontario, Canada N6A 5K8

Arch Neurol. 1996;53(4):294-295. doi:10.1001/archneur.1996.00550040020004

In reply  The reported analysis consisted of 59 medically treated patients who experienced their first-ever RTIA before entry into NASCET. The data were analyzed up until February 21, 1991, which yielded an average of 19 months of follow-up, eight minor strokes, and a risk of stroke of 16.6% at 2 years.1 Only one of the eight patients who went on to have a stroke had a preceding HTIA. The only warning sign for the remaining seven was their RTIA.Although we had analyzed data on a comparable number of surgically treated patients, too few outcome events occurred to warrant inclusion in the article. The results of the analysis are now summarized as follows. Of the 54 surgically treated patients, two had minor perioperative strokes (4%) and one had a stroke (2%) 17 months postoperatively. The risk of stroke at 2 years is 6.8% and the relative risk reduction due

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