• Hirotoshi Watanabe, Takenori Domei, Takeshi Morimoto, Masahiro Natsuaki, Hiroki Shiomi, Toshiaki Toyota, Masanobu Ohya, Satoru Suwa, Kensuke Takagi, Mamoru Nanasato, Yoshiki Hata, Masahiro Yagi, Nobuhiro Suematsu, Takafumi Yokomatsu, Itaru Takamisawa, Masayuki Doi, Toshiyuki Noda, Hideki Okayama, Yoshitane Seino, Tomohisa Tada, Hiroki Sakamoto, Kiyoshi Hibi, Mitsuru Abe, Kazuya Kawai, Koichi Nakao, Kenji Ando, Kengo Tanabe, Yuji Ikari, Keiichi Igarashi Hanaoka, Yoshihiro Morino, Ken Kozuma, Kazushige Kadota, Yutaka Furukawa, Yoshihisa Nakagawa, Takeshi Kimura, and STOPDAPT-2 Investigators.
• Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan.
• JAMA. 2019 Jun 25; 321 (24): 2414-2427.

ImportanceVery short mandatory dual antiplatelet therapy (DAPT) after percutaneous coronary intervention (PCI) with a drug-eluting stent may be an attractive option.ObjectiveTo test the hypothesis of noninferiority of 1 month of DAPT compared with standard 12 months of DAPT for a composite end point of cardiovascular and bleeding events.Design, Setting, And ParticipantsMulticenter, open-label, randomized clinical trial enrolling 3045 patients who underwent PCI at 90 hospitals in Japan from December 2015 through December 2017. Final 1-year clinical follow-up was completed in January 2019.InterventionsPatients were randomized either to 1 month of DAPT followed by clopidogrel monotherapy (n=1523) or to 12 months of DAPT with aspirin and clopidogrel (n=1522).Main Outcomes And MeasuresThe primary end point was a composite of cardiovascular death, myocardial infarction (MI), ischemic or hemorrhagic stroke, definite stent thrombosis, or major or minor bleeding at 12 months, with a relative noninferiority margin of 50%. The major secondary cardiovascular end point was a composite of cardiovascular death, MI, ischemic or hemorrhagic stroke, or definite stent thrombosis and the major secondary bleeding end point was major or minor bleeding.ResultsAmong 3045 patients randomized, 36 withdrew consent; of 3009 remaining, 2974 (99%) completed the trial. One-month DAPT was both noninferior and superior to 12-month DAPT for the primary end point, occurring in 2.36% with 1-month DAPT and 3.70% with 12-month DAPT (absolute difference, -1.34% [95% CI, -2.57% to -0.11%]; hazard ratio [HR], 0.64 [95% CI, 0.42-0.98]), meeting criteria for noninferiority (P < .001) and for superiority (P = .04). The major secondary cardiovascular end point occurred in 1.96% with 1-month DAPT and 2.51% with 12-month DAPT (absolute difference, -0.55% [95% CI, -1.62% to 0.52%]; HR, 0.79 [95% CI, 0.49-1.29]), meeting criteria for noninferiority (P = .005) but not for superiority (P = .34). The major secondary bleeding end point occurred in 0.41% with 1-month DAPT and 1.54% with 12-month DAPT (absolute difference, -1.13% [95% CI, -1.84% to -0.42%]; HR, 0.26 [95% CI, 0.11-0.64]; P = .004 for superiority).Conclusions And RelevanceAmong patients undergoing PCI, 1 month of DAPT followed by clopidogrel monotherapy, compared with 12 months of DAPT with aspirin and clopidogrel, resulted in a significantly lower rate of a composite of cardiovascular and bleeding events, meeting criteria for both noninferiority and superiority. These findings suggest that a shorter duration of DAPT may provide benefit, although given study limitations, additional research is needed in other populations.Trial RegistrationClinicalTrials.gov Identifier: NCT02619760.

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