Table LSummary strength of evidence and effect estimates: single antiplatelet versus dual antiplatelet therapy

Outcome and TimingSOEa and Effect Estimate (95% CI)
Composite ischemic endpoints, in-hospital to 1 yearSOE = High (1 RCT, 2 observational studies; 106,749 patients)
All studies showed statistically significant lowering of composite events in DAPT arm, ranging from RR 0.69 to OR 0.80; favors DAPT
Stroke, in-hospital to 1 yearSOE = Insufficient (1 RCT, 3 observational studies; 116,136 patients)
Insufficient evidence due to inconsistency and imprecision: 3 out of 4 studies showed no statistically significant difference in stroke rates
Nonfatal MI, in-hospital to 1 yearSOE = High (1 RCT, 2 observational studies; 106,749 patients)
All studies showed fewer recurrent MIs in DAPT group (2.3% to 5.8%) vs. aspirin alone (3.0% to 8.5%); favors DAPT
All-cause mortality, in-hospital to 1 yearSOE = Moderate (1 RCT, 4 observational studies; 117,467 patients)
All studies showed fewer deaths in DAPT group, ranging from OR/RR 0.66 to OR/RR 0.93; favors DAPT
Major bleeding, in-hospital to 9 monthsSOE = Low (1 RCT, 1 observational study; 105,607 patients)
2 studies showed a reduction in major bleeding in DAPT group (1 statistically significant [16% vs. 21%]; 1 not statistically significant); favors DAPT

CI = confidence interval; DAPT = dual antiplatelet therapy; MI = myocardial infarction; OR = odds ratio; RCT = randomized controlled trial; RR = relative risk; SOE = strength of evidence

a

All SOE ratings of “Insufficient” (no evidence is available or available evidence is imprecise or too inconsistent to reach a conclusion) are shaded.

From: Executive Summary

Cover of Antiplatelet and Anticoagulant Treatments for Unstable Angina/Non–ST Elevation Myocardial Infarction
Antiplatelet and Anticoagulant Treatments for Unstable Angina/Non–ST Elevation Myocardial Infarction [Internet].
Comparative Effectiveness Reviews, No. 129.
Melloni C, Jones WS, Washam JB, et al.

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