Aspirin Monotherapy Versus Sequential Warfarin-Aspirin Therapy After TAVR in Patients With Pure Aortic Regurgitation (AWATAR)
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
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
研究の種類
研究の種類
入学 (推定)
入学
段階
段階
- 適用できない
連絡先と場所
研究連絡先
研究連絡先
- 名前:Lai Wei, MD
- 電話番号:+86-021-64041990
- メール:Wei.lai@zs-hospital.sh.cn
研究場所
-
-
Shanghai Municipality
-
Shanghai、Shanghai Municipality、中国
- 募集
- Zhongshan hospital, Fudan university
-
コンタクト:
- Lai Wei, MD
- 電話番号:+86-021-64041990
- メール:Wei.lai@zs-hospital.sh.cn
-
-
参加基準
適格基準
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
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
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
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・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
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
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
|
協力者と研究者
協力者
協力者
研究記録日
主要日程の研究
研究開始 (実際)
研究開始
一次修了 (推定)
一次修了
研究の完了 (推定)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
本研究に関する用語
追加の関連 MeSH 用語
その他の研究ID番号
その他の研究ID番号
- KY2026134
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