EFFICACY OF TICLOPIDINE AND ASPIRIN FOR PREVENTION OF REVERSIBLE CEREBROVASCULAR ISCHEMIC EVENTS - THE TICLOPIDINE ASPIRIN STROKE STUDY

Background and Purpose: This subgroup analysis from the Ticlopidine As pirin Stroke Study (TASS) compared ticlopidine, a new antiplatelet age nt, with aspirin for the prevention of recurrent transient ischemic at tacks in patients who had a recent reversible cerebrovascular event. M ethods: This was a multicenter, double-blind, randomized trial in pati ents with a recent cerebral ischemic history. Patients with a reversib le cerebral ischemic event within 3 months of enrollment were eligible for the study. All patients received either aspirin 650 mg twice dail y or ticlopidine 250 mg twice daily for up to 5.8 years. The primary e nd point in this analysis was the first occurrence of a reversible isc hemic event either alone or combined with nonfatal stroke or death and fatal or nonfatal stroke. Results: Overall, ticlopidine was better th an aspirin for reducing the risk of reversible ischemic events either alone or as a composite with death and/or stroke or with fatal and/or nonfatal stroke (P=.007 to P<.001). The risk reductions with ticlopidi ne were maintained for the duration of the 5-year follow-up. The most frequent or clinically important adverse effects associated with ticlo pidine were diarrhea, rash, and neutropenia. Neutropenia was severe in 13 patients but resolved promptly with discontinuation of therapy. Co nclusions: The results in this subgroup of patients with reversible is chemic disease, as well as the overall analysis of TASS, suggest that ticlopidine is a more effective agent than aspirin for the prevention of recurrent transient ischemic attacks.