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Aspirin-Free Strategy After 3-6 Month Dual Antiplatelet Therapy in Acute Coronary Syndrome

2026年7月29日 更新者:Asmaa Sayed Shaban Ali、Assiut University

Aspirin-Free Strategy After 3-6 Month Dual Antiplatelet Therapy in Acute Coronary Syndrome Patients Who Underwent Complete Revascularization : A Randomized Controlled Trial

This randomized controlled trial aims to evaluate the safety and efficacy of an aspirin-free strategy after 3-6 months of dual antiplatelet therapy (DAPT) in patients with acute coronary syndrome (ACS) who have undergone complete coronary revascularization by percutaneous coronary intervention (PCI). Participants will be randomized to either discontinue aspirin and continue P2Y12 inhibitor monotherapy or continue standard antiplatelet therapy. The primary objective is to determine whether the aspirin-free strategy reduces bleeding events without increasing ischemic events during follow-up.

調査の概要

状態

まだ募集していません

条件

介入・治療

詳細な説明

Acute Coronary Syndrome (ACS) remains a leading cause of cardiovascular mortality and morbidity worldwide. Current management of ACS-including ST-segment elevation myocardial infarction (STEMI), non-ST-segment elevation myocardial infarction (NSTEMI), and high-risk unstable angina (UA)-relies on early invasive revascularization using Percutaneous Coronary Intervention (PCI) with contemporary Drug-Eluting Stents (DES). Following PCI, endothelial injury and stent implantation activate platelet aggregation and thrombosis, making Dual Antiplatelet Therapy (DAPT) with aspirin plus a P2Y12 inhibitor the standard treatment to prevent stent thrombosis and recurrent ischemic events. International guidelines have traditionally recommended 12 months of DAPT after ACS. However, prolonged DAPT increases the risk of bleeding, including gastrointestinal and intracranial hemorrhage, which is associated with higher mortality, treatment discontinuation, poor adherence, and increased healthcare utilization.

To improve the balance between ischemic protection and bleeding risk, several landmark randomized trials-including TWILIGHT, TICO, STOPDAPT-2, STOPDAPT-3, SMART-CHOICE, and GLOBAL LEADERS-have investigated abbreviated DAPT followed by P2Y12 inhibitor monotherapy after 1-3 months of treatment. These studies consistently demonstrated a significant reduction in major bleeding without a corresponding increase in major ischemic outcomes, including myocardial infarction or stent thrombosis.

Despite these promising findings, most available evidence has been generated in East Asian populations, where genetic factors, including CYP2C19 polymorphisms, and differences in thrombotic and bleeding risk may limit the generalizability of the results to other populations This clinical trial aims to address this important evidence gap by evaluating the safety and efficacy of abbreviated DAPT followed by P2Y12 inhibitor monotherapy in a non-Asian ACS population undergoing PCI with contemporary drug-eluting stents

研究の種類

介入

入学 (推定)

300

段階

  • フェーズ 4

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

    • Asyut Governorate
      • Asyut、Asyut Governorate、エジプト、71515
        • Assiut University hospital

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

  • 子
  • 大人
  • 高齢者

健康ボランティアの受け入れ

はい

説明

Inclusion Criteria:

  • 1. Must have an established, objectively confirmed diagnosis of an acute coronary syndrome, classified as STEMI, NSTEMI, or high-risk Unstable Angina.

    2. Underwent successful PCI with deployment of contemporary drug-eluting stents (DES) and TIMI 3 flow.

    3. Achieved documented complete revascularization of all angiographically significant lesions during the index procedure.

    4. Maintained absolute adherence to standard, uncomplicated combination DAPT for exactly 30 ± 7 days following the index PCI, remaining completely free of any ischemic or bleeding events during this initial month.

    5. Patient is fully coherent, cooperative, able to comply with the mandated multi-month follow-up schedule, and has provided independent, written, personally signed informed consent prior to randomization.

Exclusion Criteria:

Left Main (LM) Coronary Artery Disease & bifurcation lesions with 2 stents : Any angiographically documented significant stenosis (>50% diameter stenosis) involving the unprotected left main coronary artery trunk, regardless of whether it was treated with a stent during the index procedure or left untreated.

2. Incomplete Revascularization / Residual Target Lesions: Presence of any remaining untreated coronary lesion with >50% diameter stenosis in any major epicardial vessel or branch with a reference vessel diameter ≥2.0 mm that requires, or is planned to require, any future surgical or percutaneous revascularization within the next 12 months. This 'other lesion' exclusion ensures a fully revascularized cohort.

3. Any prior historical or documented acute, subacute, or late definitive stent thrombosis.

4. High baseline ischemic features including end-stage chronic kidney disease (eGFR < 30 mL/min/1.73m²), severe left ventricular dysfunction (LVEF < 30%), or an un-revascularized multi-vessel burden with high residual SYNTAX score (>22).

5. Definitive clinical indication for continuous, long-term oral anticoagulation therapy (e.g., atrial fibrillation, mechanical valves, deep vein thrombosis, or pulmonary embolism).

6. Active major pathological bleeding, history of any spontaneous or traumatic intracranial hemorrhage, vascular malformations of the central nervous system, or an established bleeding diathesis.

7. Active system-wide infections, or documented chronic systemic inflammatory or autoimmune disorders (such as severe active rheumatoid arthritis, systemic lupus erythematosus, polymyalgia rheumatica, active inflammatory bowel disease), or active malignancies, which confound baseline leukocyte values.

8. Known severe hypersensitivity, documented allergy, or major medical intolerance to acetylsalicylic acid (Aspirin) or clopidogrel (Plavix).

-

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:クロスオーバー割り当て
  • マスキング:なし(オープンラベル)

武器と介入

参加者グループ / アーム
介入・治療
実験的:Aspirin + clopidogrel
Aspirin will be discontinued after 3-6 months of dual antiplatelet therapy. Participants will continue P2Y12 inhibitor monotherapy (Clopidogrel 75 mg once daily or Ticagrelor 90 mg twice daily, according to the treating physician) for the remainder of the follow-up.
Aspirin will be discontinued after 3-6 months of dual antiplatelet therapy, and participants will continue P2Y12 inhibitor monotherapy for the remainder of the study follow-up
アクティブコンパレータ:Standered Antiplatelet Therapy (Aspirin + Clopidogrel)
Participants will continue standard antiplatelet therapy according to current guideline-directed management after complete coronary revascularization.
Participants will continue standard antiplatelet therapy according to current clinical practice after complete coronary revascularization.

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
Net adverse clinical events
時間枠:12 months
Composite of major adverse cardiovascular events (cardiovascular death, myocardial infarction, ischemic stroke, or definite/probable stent thrombosis) and major bleeding (BARC type 3 or 5).
12 months

二次結果の測定

結果測定
メジャーの説明
時間枠
Major Adverse Cardiovascular Events (MACE)
時間枠:12 months

Major Adverse Cardiac Events (MACE): A strict composite endpoint consisting of cardiovascular mortality, non-fatal myocardial infarction, or acute ischemic stroke.

  • Cardiovascular Mortality: Incorporates any death resulting from an acute myocardial infarction, sudden cardiac death, fatal cardiac arrest, cardiogenic shock, terminal heart failure, fatal stroke, or any death directly caused by a documented procedural complication related to the index or staged PCI.
  • Myocardial Infarction (MI): Diagnosed and classified in strict accordance with the Fourth Universal Definition of Myocardial Infarction (Type 1 spontaneous, Type 2 demand mismatch, Type 4a PCI-related).
  • Stent Thrombosis (ST): Formally categorized according to the Academic Research Consortium (ARC) consensus definitions into definite, probable, or possible stent thrombosis. Definite Stent Thrombosis requires unequivocal angiographic confirmation of a thrombus originating within or directly adjacent to the stented segment
12 months
Bleeding
時間枠:12 months
The primary safety outcome is the occurrence of bleeding complications, which will be characterized using the international Bleeding Academic Research Consortium (BARC) consensus
12 months

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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 (推定)

2026年7月15日

一次修了 (推定)

2029年7月30日

研究の完了 (推定)

2030年6月1日

試験登録日

最初に提出

2026年7月25日

QC基準を満たした最初の提出物

2026年7月29日

最初の投稿 (実際)

2026年7月30日

学習記録の更新

投稿された最後の更新 (実際)

2026年7月30日

QC基準を満たした最後の更新が送信されました

2026年7月29日

最終確認日

2026年7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

  • Aspirin-free strategy2542

個々の参加者データ (IPD) の計画

個々の参加者データ (IPD) を共有する予定はありますか?

いいえ

IPD プランの説明

There is no plan to share individual participant data.

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はい

米国FDA規制機器製品の研究

いいえ

米国で製造され、米国から輸出された製品。

はい

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