In order to bring you the best possible user experience, this site uses Javascript. If you are seeing this message, it is likely that the Javascript option in your browser is disabled. For optimal viewing of this site, please ensure that Javascript is enabled for your browser.
Did you know that your browser is out of date? To get the best experience using our website we recommend that you upgrade to a newer version. Learn more.

Dual-antiplatelet therapy should remain standard strategy after stent implantation

STOPDAPT-3 trial presented in a Hot Line Session today at ESC Congress 2023

Interventional Cardiology
Pharmacology and Pharmacotherapy

Amsterdam, Netherlands – 26 Aug 2023: Prasugrel monotherapy after percutaneous coronary intervention (PCI) with drug-eluting stents is not superior to dual-antiplatelet therapy (DAPT) for major bleeding but is non-inferior for cardiovascular events in patients with acute coronary syndrome (ACS) or high bleeding risk (HBR), according to late breaking research presented in a Hot Line session today at ESC Congress 2023.1

Very short (1 to 3 months) durations of DAPT followed by P2Y12 inhibitor monotherapy has been shown to reduce bleeding events without increasing cardiovascular events compared with standard durations of DAPT after PCI using drug-eluting stents. However, the incidence of major bleeding events within the 1-month mandatory DAPT period after PCI remains high in real clinical practice, particularly in patients with ACS or HBR.2 In single-arm studies, aspirin-free prasugrel or ticagrelor monotherapy following successful new-generation drug-eluting stent implantation was not associated with any stent thrombosis in selected low-risk patients with or without ACS.3-5 Removing aspirin from the DAPT regimen might reduce bleeding events early after PCI without compromising the risk of cardiovascular events. However, the efficacy and safety of this strategy has not been proven in randomised trials.

ESC guidelines recommend 6 months of DAPT in HBR patients with ACS and 12 months of DAPT in non-HBR patients with ACS after PCI. In patients with non-ACS, 1 to 3 months of DAPT is recommended in HBR patients after PCI.6

STOPDAPT-3 investigated the efficacy and safety of aspirin-free prasugrel monotherapy compared with 1-month DAPT with aspirin and prasugrel in patients with ACS or HBR undergoing PCI with cobalt-chromium everolimus-eluting stents. From January 2021 to April 2023, the study enrolled 6,002 patients with ACS or HBR from 72 centres in Japan. Just before PCI, patients were randomised in a 1:1 fashion to prasugrel (3.75 mg/day) monotherapy or to DAPT with aspirin (81-100 mg/day) and prasugrel after a loading dose of prasugrel 20 mg in both groups.

There were two primary endpoints: 1) major bleeding events (defined as Bleeding Academic Research Consortium [BARC] type 3 or 5) at 1 month for superiority; and 2) cardiovascular events (a composite of cardiovascular death, myocardial infarction, definite stent thrombosis, or stroke) at 1 month for non-inferiority. The major secondary endpoint was a composite of the co-primary bleeding and cardiovascular endpoints (cardiovascular death, myocardial infarction, definite stent thrombosis, stroke, or major bleeding) at 1 month representing net clinical benefit.

The full analysis set population consisted of 5,966 patients (no-aspirin group: 2,984 patients; DAPT group: 2,982 patients). The average age was 71.6 years and 23.4% were women. At 1 month, the no-aspirin strategy was not superior to DAPT for the co-primary bleeding endpoint (4.47% vs. 4.71%; hazard ratio [HR], 0.95; 95% confidence interval [CI], 0.75-1.20; p for superiority=0.66). The no-aspirin strategy was non-inferior to DAPT with a relative 50% margin for the co-primary cardiovascular endpoint (4.12% vs. 3.69%; HR, 1.12; 95% CI, 0.87-1.45; p for non-inferiority=0.01).

There was no between-group difference in the incidence of all-cause death (2.28% vs. 2.11% in the no-aspirin and DAPT groups, respectively). The major secondary endpoint occurred in 7.14% patients in the no-aspirin group and 7.38% patients in the DAPT group, with no between-group difference, indicating a similar effect on net clinical benefit for both groups.

There was an excess of any coronary revascularisation (1.15% vs. 0.57%) and definite or probable stent thrombosis (0.71% vs. 0.44%) in the no-aspirin group compared with the DAPT group, while definite stent thrombosis was not different between the 2 groups (0.47% vs. 0.37%). In a subgroup analysis stratified by ACS and non-ACS, the excess risk of cardiovascular events in the no-aspirin group compared with the DAPT group was seen in patients with ACS, but not in those without ACS.

Study author Dr. Masahiro Natsuaki of Saga University, Japan said: “The aspirin-free strategy compared with the DAPT strategy failed to reduce major bleeding within 1 month after PCI, but it was non-inferior for the co-primary cardiovascular endpoint with a relative 50% margin. Aspirin used for a limited period of 1 month after PCI as a component of DAPT might have exerted a protective effect on vulnerable coronary lesions, particularly in patients with ACS, without a large increase in major bleeding. DAPT should remain the standard strategy for PCI even in the new-generation drug-eluting stent era.”



Notes to editor

ESC Press Office
Tel: +33 (0)6 61 40 18 84

The hashtag for ESC Congress 2023 is #ESCCongress

Follow us on Twitter @ESCardioNews 


This press release accompanies both a presentation and an ESC press conference at ESC Congress 2023. It does not necessarily reflect the opinion of the European Society of Cardiology.


Funding: Abbott Medical Japan.


Disclosures: Dr Natsuaki reports honoraria from Abbott Medical Japan, Daiichi Sankyo and Bayer.


References and notes

1STOPDAPT-3 will be discussed during Hot Line 3 on Saturday 26 August at 16:30 to 17:30 CEST in room Amsterdam.

2Natsuaki M, Morimoto T, Shiomi H, et al. Effects of acute coronary syndrome and stable coronary artery disease on bleeding and ischemic risk after percutaneous coronary intervention. Circ J. 2021;85:1928-1941.

3Kogame N, Guimaraes PO, Modolo R, et al. Aspirin-free prasugrel monotherapy following coronary artery stenting in patients with stable CAD: The ASET pilot study. JACC Cardiovasc Interv. 2020;13:2251-2262.

4Muramatsu T, Masuda S, Kotoku N, et al. Prasugrel monotherapy after percutaneous coronary intervention with biodegradable-polymer platinum-chromium everolimus eluting stent for Japanese patients with chronic coronary syndrome (ASET-JAPAN). Circ J. 2023;87:857-865.

5van der Sangen NMR, Claessen BEPM, Kucuk IT, et al. Single antiplatelet therapy directly after percutaneous coronary intervention in non-ST-segment elevation acute coronary syndrome patients: the OPTICA study. EuroIntervention. 2023;19:63-72.

6Valgimigli M, Bueno H, Byrne RA, et al. 2017 ESC focused update on dual antiplatelet therapy in coronary artery disease developed in collaboration with EACTS. Eur Heart J. 2018;39:213-260.


About ESC Congress 2023

It is the world’s largest gathering of cardiovascular professionals, disseminating ground-breaking science both onsite in Amsterdam and online – from 25 to 28 August. Explore the scientific programme. More information is available from the ESC Press Office at


About the European Society of Cardiology

The ESC brings together health care professionals from more than 150 countries, working to advance cardiovascular medicine and help people to live longer, healthier lives.