The incidence of stroke on cranial computed tomography (CT) and change in echocardiographic vegetation area was prospectively compared in a preliminary observational study involving nine patients with infective endocarditis randomized to either low-dose aspirin (75 mg d-1, Group I, n = 4) or no aspirin (Group II, n = 5). Two symptomatic cerebral infarcts and one myocardial infarct occurred in the controls, compared to no events in patients on aspirin during a total observation period of 343 d (range 28-49 d). The mean vegetation area decreased in the aspirin group (mean change = -0.24 cm2), compared to an increase in controls (mean change = +0.35 cm2). The platelet half-life (normal range 5-6 d), which was measured using Indium-111 radiolabelling, tended to be lower in Group II (4.6 +/- 0.2 vs. 3.9 +/- 0.5 d). No side-effects or complications attributable to aspirin were observed. A possible role for adjunctive aspirin therapy in the prevention of embolic complications in infective endocarditis is suggested, and warrants further study.
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