Design and rationale of the GUARD-OAC: A randomized controlled trial evaluating proton pump inhibitor cotherapy for gastrointestinal protection in patients requiring direct oral anticoagulants.

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Title: Design and rationale of the GUARD-OAC: A randomized controlled trial evaluating proton pump inhibitor cotherapy for gastrointestinal protection in patients requiring direct oral anticoagulants.
Authors: Ahn HJ; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea., Lee SR; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea., Kwon S; Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Republic of Korea., Rhee TM; Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea., Lee YS; Department of Cardiology, Daegu Catholic University Medical Center, Daegu, Republic of Korea., Han SJ; Department of Internal Medicine, College of Medicine, Hallym University, Anyang, Republic of Korea., Kang KW; Department of Internal Medicine, Division of Cardiology, Chung-Ang University Hospital, College of Medicine, Seoul, Republic of Korea., Shim J; Department of Internal Medicine, Division of Cardiology, Korea University College of Medicine and Korea University Anam Hospital, Seoul, Republic of Korea., Yu HT; Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Republic of Korea., Oh IY; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Cardiology, Cardiovascular Centre, Seoul National University Bundang Hospital, Seongnam, Republic of Korea., Park HS; Department of Internal Medicine, Division of Cardiology, Keimyung University Dongsan Hospital, Daegu, Republic of Korea., Park JK; Department of Internal Medicine, Division of Cardiology, Hanyang University Seoul Hospital, Seoul, Republic of Korea., Jang SW; Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, Division of Cardiology, The Catholic University of Korea, Seoul, Republic of Korea., Lee SH; Department of Internal Medicine, Kangbuk Samsung Hospital, Division of Cardiology, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea., Roh SY; Department of Internal Medicine, Division of Cardiology, Korea University Medicine Guro hospital, Seoul, Republic of Korea., Chun KJ; Department of Internal Medicine, Division of Cardiology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Republic of Korea., Park HW; Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea., Lee KY; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Internal Medicine, Division of Cardiology, Korea University Medicine Guro hospital, Seoul, Republic of Korea., Oh S; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea., Choi EK; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. Electronic address: choiek17@snu.ac.kr.
Corporate Authors: GUARD-OAC Trial Investigators
Source: American heart journal [Am Heart J] 2026 May; Vol. 295, pp. 107341. Date of Electronic Publication: 2026 Jan 06.
Publication Type: Journal Article; Clinical Trial Protocol
Journal Info: Publisher: Mosby Country of Publication: United States NLM ID: 0370465 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1097-6744 (Electronic) Linking ISSN: 00028703 NLM ISO Abbreviation: Am Heart J Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: Design and rationale of the GUARD-OAC: A randomized controlled trial evaluating proton pump inhibitor cotherapy for gastrointestinal protection in patients requiring direct oral anticoagulants.
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  Data: <searchLink fieldCode="AU" term="%22Ahn+HJ%22">Ahn HJ</searchLink>; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Lee+SR%22">Lee SR</searchLink>; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Kwon+S%22">Kwon S</searchLink>; Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Rhee+TM%22">Rhee TM</searchLink>; Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Lee+YS%22">Lee YS</searchLink>; Department of Cardiology, Daegu Catholic University Medical Center, Daegu, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Han+SJ%22">Han SJ</searchLink>; Department of Internal Medicine, College of Medicine, Hallym University, Anyang, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Kang+KW%22">Kang KW</searchLink>; Department of Internal Medicine, Division of Cardiology, Chung-Ang University Hospital, College of Medicine, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Shim+J%22">Shim J</searchLink>; Department of Internal Medicine, Division of Cardiology, Korea University College of Medicine and Korea University Anam Hospital, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Yu+HT%22">Yu HT</searchLink>; Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Oh+IY%22">Oh IY</searchLink>; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Cardiology, Cardiovascular Centre, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Park+HS%22">Park HS</searchLink>; Department of Internal Medicine, Division of Cardiology, Keimyung University Dongsan Hospital, Daegu, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Park+JK%22">Park JK</searchLink>; Department of Internal Medicine, Division of Cardiology, Hanyang University Seoul Hospital, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Jang+SW%22">Jang SW</searchLink>; Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, Division of Cardiology, The Catholic University of Korea, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Lee+SH%22">Lee SH</searchLink>; Department of Internal Medicine, Kangbuk Samsung Hospital, Division of Cardiology, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Roh+SY%22">Roh SY</searchLink>; Department of Internal Medicine, Division of Cardiology, Korea University Medicine Guro hospital, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Chun+KJ%22">Chun KJ</searchLink>; Department of Internal Medicine, Division of Cardiology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Park+HW%22">Park HW</searchLink>; Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Lee+KY%22">Lee KY</searchLink>; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Internal Medicine, Division of Cardiology, Korea University Medicine Guro hospital, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Oh+S%22">Oh S</searchLink>; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.<br /><searchLink fieldCode="AU" term="%22Choi+EK%22">Choi EK</searchLink>; Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. Electronic address: choiek17@snu.ac.kr.
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  Data: <searchLink fieldCode="JN" term="%220370465%22">American heart journal</searchLink> [Am Heart J] 2026 May; Vol. 295, pp. 107341. <i>Date of Electronic Publication: </i>2026 Jan 06.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Mosby%22">Mosby </searchLink><i>Country of Publication: </i>United States <i>NLM ID: </i>0370465 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1097-6744 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2200028703%22">00028703 </searchLink><i>NLM ISO Abbreviation: </i>Am Heart J <i>Subsets: </i>MEDLINE
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=mdl&AN=41506417
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