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Aspirin Monotherapy Versus Sequential Warfarin-Aspirin Therapy After TAVR in Patients With Pure Aortic Regurgitation (AWATAR)

2026年8月7日 更新者:Wei Lai, MD、Shanghai Zhongshan Hospital

Prospective, Multicenter, Randomized Controlled Trial Evaluating the Safety and Efficacy of Different Antithrombotic Therapy Strategies in Patients With Severe Aortic Regurgitation Undergoing Transcatheter Aortic Valve Replacement

This multicenter randomized controlled trial evaluates antithrombotic strategies post-TAVR in severe aortic regurgitation patients without long-term anticoagulation. Patients are randomized 1:1 to aspirin 75-100 mg daily for 12 months versus warfarin (INR 2-3) for 6 months followed by aspirin for 6 months. Primary hypothesis: aspirin is superior for bleeding and non-inferior for death/thrombosis. Primary endpoint is a composite of death, stroke, thrombosis, MI, embolism, and major bleeding at 1 year. Sample size: 1172. Follow-up: 30 days, 6 months, 12 months.

調査の概要

状態

募集

条件

介入・治療

研究の種類

介入

入学 (推定)

1172

段階

  • 適用できない

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

研究場所

    • Shanghai Municipality
      • Shanghai、Shanghai Municipality、中国
        • 募集
        • Zhongshan hospital, Fudan university
        • コンタクト:

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

  • 大人
  • 高齢者

健康ボランティアの受け入れ

いいえ

説明

Inclusion Criteria:

  • Age ≥18 years.
  • Patients with severe aortic regurgitation (AR) who achieve technical success after TAVR using devices specifically indicated for AR (per VARC-3 criteria).
  • Trileaflet aortic valve anatomy.
  • No long-term anticoagulation indication (including but not limited to: atrial fibrillation, mechanical mitral valve prosthesis, deep vein thrombosis, pulmonary embolism, left ventricular thrombus, pulmonary hypertension, or coagulation disorders) as confirmed by the investigator.
  • Signed written informed consent and willingness to comply with randomization, study procedures, and follow-up.

Exclusion Criteria:

  • Need for oral anticoagulation or dual antiplatelet therapy, or need for oral or intravenous strong CYP3A inhibitors that cannot be paused during the study period.
  • Active pathological bleeding, subdural hematoma, or history of intracranial hemorrhage.
  • Ischemic stroke within 30 days before TAVR.
  • Acute myocardial infarction within 30 days.
  • Severe hepatic insufficiency (cirrhosis, hepatic decompensation).
  • Severe renal insufficiency (eGFR < 30 mL/min/1.73 m²) or need for renal replacement therapy.
  • Stent implantation (including coronary, carotid, or peripheral arteries) within 12 months before TAVR, or planned stent implantation within 1 year after TAVR.
  • Coronary artery bypass grafting (CABG) within 12 months before TAVR.
  • Allergy, intolerance, or known resistance to aspirin, clopidogrel, or warfarin.
  • Known coagulation disorders or bleeding diathesis (including but not limited to platelet count ≤50,000/mm³ at screening).
  • Any contraindication to anticoagulation therapy.
  • Prior aortic valve prosthesis (mechanical or bioprosthetic); mitral valve bioprosthesis replacement within 1 year before TAVR; or prior mitral mechanical valve replacement; or prior tricuspid valve replacement.
  • Emergency TAVR with cardiogenic shock manifesting as low cardiac output, vasopressor or respiratory dependence, or mechanical hemodynamic support.
  • Life expectancy <1 year (e.g., terminal malignancy).
  • Participation in another investigational drug or device clinical study (patients who have completed the primary endpoint of the study and are currently in long-term follow-up are not excluded).
  • Pregnancy or planned pregnancy, or use of estrogen or estrogen-like drugs (for women with suspected pregnancy, serum or urine human chorionic gonadotropin test must be negative before enrollment).
  • Any other condition deemed by the investigator to be inappropriate for study participation.

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

  • 主な目的:処理
  • 割り当て:ランダム化
  • 介入モデル:並列代入
  • マスキング:独身

武器と介入

参加者グループ / アーム
介入・治療
実験的:Aspirin Monotherapy
Aspirin 75-100 mg orally once daily for 12 months
Aspirin 75-100 mg orally once daily
アクティブコンパレータ:Standard Therapy
Warfarin (INR 2-3) for 6 months, followed by Aspirin 75-100 mg once daily for 6 months
Aspirin 75-100 mg orally once daily
Warfarin orally with dose adjusted to maintain INR 2-3

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
Number of Participants Who Experienced Non-hierarchical Composite Endpoint
時間枠:12 months post-procedure
The primary endpoint is a non-hierarchical composite endpoint including all-cause death, stroke, prosthetic valve thrombosis, intracardiac thrombosis, myocardial infarction, deep vein thrombosis or pulmonary embolism, systemic embolism, and life-threatening, disabling, or major bleeding (VARC-3 definition).
12 months post-procedure

二次結果の測定

結果測定
メジャーの説明
時間枠
Number of Participants Who Experienced Composite Endpoint of All-Cause Death, Ischemic Stroke, Valve/Intracardiac Thrombosis, and Myocardial Infarction.
時間枠:12 months post-procedure
The first key secondary endpoint is composite of all-cause death, ischemic stroke, valve/intracardiac thrombosis, and myocardial infarction.
12 months post-procedure
Number of Participants Who Experienced Composite of Life-threatening, Disabling, or Major Bleeding (based on VARC-3 criteria Type 2-4)
時間枠:12 months post-procedure

Life-threatening or disabling bleeding Fatal bleeding OR Bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, or pericardial necessitating pericardiocentesis, or intramuscular with compartment syndrome OR Bleeding causing hypovolemic shock or severe hypotension requiring vasopressors or surgery OR Overt source of bleeding with drop in haemoglobin of ≥5 g/dL or whole blood or packed red blood cells (RBCs) transfusion ≥4 unitsa

Major bleeding Overt bleeding either associated with a drop in the haemoglobin level of at least 3.0 g/dL or requiring transfusion of two or three units of whole blood/RBC AND Does not meet criteria of life-threatening or disabling bleeding

12 months post-procedure
Number of Participants Who Experience Composite of Cardiovascular Death, Major Bleeding, Stroke, and Myocardial Infarction
時間枠:12 months post-procedure
12 months post-procedure
Number of Participants Who Experience Clinical Efficacy Composite Endpoint
時間枠:12 months post-procedure
Composite endpoint requiring all of the following: freedom from all-cause death; freedom from all stroke; no hospitalization for valve-related or procedure-related reasons; and KCCQ overall score ≥45 with no more than a 10-point decrease from baseline.
12 months post-procedure
Number of Participants Who Experienced All-Cause Death
時間枠:12 months post-procedure
12 months post-procedure
Number of Participants Who Experience Clinically Significant Prosthetic Valve Thrombosis (VARC-3)
時間枠:At 6 months and 12 months post-procedure
Based on VARC-3 criteria, clinically significant prosthetic valve thrombosis defined as clinical. sequelae of a thromboembolic event (e.g. stroke, TIA, retinal occlusion, other evidence of systemic thromboembolism) or worsening valve stenosis/ regurgitation (e.g. signs of heart failure, syncope) and Haemodynamic valve deterioration Stage 2 or 3 or Confirmatory imaging (CT evidence of HALT or TEE findings) In the absence of clinical sequelae, both Haemodynamic valve deterioration Stage 3 and Confirmatory imaging (CT evidence of HALT or TEE findings)
At 6 months and 12 months post-procedure
Number of Participants Who Experience Bioprosthetic Valve Deterioration Stage 3 by Echocardiography (VARC-3)
時間枠:12 months post-procedure
Bioprosthetic Valve Failure Stage 3 defined as increase in mean transvalvular gradient ≥20 mmHg resulting in mean gradient ≥30 mmHg with concomitant decrease in EOA ≥0.6 cm2 or ≥50% and/or decrease in Doppler velocity index ≥0.2 or ≥40% compared with echocardiographic assessment performed 1-3 months post-procedure, OR new occurrence, or increase of ≥2grades, of intraprosthetic AR resulting in severe AR
12 months post-procedure
Number of Participants Who Experience Hypo-Attenuated Leaflet Thickening (HALT) by CT
時間枠:12 months post-procedure
12 months post-procedure
Number of Participants Who Experienced Non-Procedure-Related Life-Threatening or Disabling Bleeding (VARC-3)
時間枠:At 30 days and 12 months post-procedure
At 30 days and 12 months post-procedure
Number of Participants Who Experienced Major Bleeding
時間枠:At 30 days and 12 months post-procedure
Based on VARC 2 criteria
At 30 days and 12 months post-procedure
Number of Participants Who Experienced Minor Bleeding
時間枠:At 30 days and 12 months post-procedure
Based on VARC 2 criteria
At 30 days and 12 months post-procedure
Number of Participants Who Experienced Aortic Valve Re-Intervention
時間枠:12 months post-procedure
12 months post-procedure
Number of Participants Who Experienced Heart Failure Re-Hospitalization
時間枠:12 months post-procedure
12 months post-procedure
Number of Participants Who Experienced Infective Endocarditis
時間枠:12 months post-procedure

Infective Endocarditis defined as:

Meeting at least one of the following criteria:

Fulfills the Duke criteria for endocarditis; Intraoperative evidence of an abscess, pus, or vegetation secondary to infection, confirmed by histology or microbiology; Autopsy evidence of an abscess, pus, or vegetation.

12 months post-procedure
Number of Participants Who Experienced Major Adverse Cardiovascular and Cerebrovascular Events (MACCE)
時間枠:At 30 days and 12 months post-procedure
MACCE including cardiac death, aortic valve reintervention, stroke, myocardial infarction, heart failure readmission and life-threatening, disabling, or major bleeding.
At 30 days and 12 months post-procedure
Number of Participants Who Experienced NYHA Class Improvement
時間枠:At 30 days and 12 months post-procedure
At 30 days and 12 months post-procedure

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研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (実際)

2026年7月18日

一次修了 (推定)

2029年7月1日

研究の完了 (推定)

2030年7月1日

試験登録日

最初に提出

2026年6月23日

QC基準を満たした最初の提出物

2026年6月27日

最初の投稿 (実際)

2026年6月30日

学習記録の更新

投稿された最後の更新 (実際)

2026年8月10日

QC基準を満たした最後の更新が送信されました

2026年8月7日

最終確認日

2026年8月1日

詳しくは

本研究に関する用語

その他の研究ID番号

  • KY2026134

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