How much does clopidogrel increase the bleeding risk of aspirin?

Risk for major hemorrhages in patients receiving clopidogrel and aspirin compared with aspirin alone after transient ischemic attack or minor ischemic stroke: a secondary analysis of the POINT randomized clinical trial.

Tillman H, Johnston SC, Farrant M, et al.

JAMA Neurol 2019; 76:774-782.

Abstract

IMPORTANCE:

Results show the short-term risk of hemorrhage in treating patients with acute transient ischemic attack (TIA) or minor acute ischemic stroke (AIS) with clopidogrel plus aspirin or aspirin alone.

OBJECTIVE:

To characterize the frequency and kinds of major hemorrhages in the Platelet-Oriented Inhibition in New TIA and Minor Ischemic Stroke (POINT) trial.

METHODS:

This secondary analysis of the POINT randomized, double-blind clinical trial conducted in 10 countries in North America, Europe, and Australasia included patients with high-risk TIA or minor AIS who were randomized within 12 hours of symptom onset and followed up for 90 days. The total enrollment, which occurred from May 28, 2010, through December 17, 2017, was 4881 and constituted the intention-to-treat group; 4819 (98.7%) were included in the as-treated analysis group. The primary safety analyses were as-treated, classifying patients based on study drug actually received. Intention-to-treat analyses were performed as secondary analyses. Data were analyzed in April 2018.

INTERVENTIONS:

Patients were assigned to receive clopidogrel (600 mg loading dose on day 1 followed by 75 mg daily for days 2-90) or placebo; all patients also received open-label aspirin, 50 to 325 mg/d.

MAIN OUTCOMES AND MEASURES:

The primary safety outcome was all major hemorrhages. Other safety outcomes included minor hemorrhages.

RESULTS:

A total of 269 sites worldwide randomized 4881 patients (median age, 65.0 years [interquartile range, 55-74 years]; 2195 women [45.0%]); the primary results have been published previously. In the as-treated analyses, major hemorrhage occurred in 21 patients (0.9%) receiving clopidogrel  plus aspirin and 6 (0.2%) in the aspirin alone group (hazard ratio, 3.57; 95% CI, 1.44-8.85; P = .003; number needed to harm, 159). There were 4 fatal hemorrhages (0.1%; 3 in the clopidogrel plus aspirin group and 1 in the aspirin alone group); 3 of the 4 were intracranial. There were 7 intracranial hemorrhages (0.1%); 5 were in the clopidogrel plus aspirin group and 2 in the aspirin plus placebo group. The most common location of major hemorrhages was in the gastrointestinal tract.

CONCLUSIONS:

The risk for major hemorrhages in patients receiving either clopidogrel plus aspirin or aspirin alone after TIA or minor AIS was low. Nevertheless, treatment with clopidogrel plus aspirin increased the risk of major hemorrhages  over aspirin alone from 0.2% to 0.9%.

This paper is cited in the neurochecklist:

Secondary stroke prevention: antiplatelets

Abstract link

By MarinaVladivostokOwn work, CC0, Link

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