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Change in Platelet Lipid Metabolism and Procoagulant Phenotype Induced by Cardiopulmonary Bypass. Impact on Postoperative Inflammatory Response and Bleeding Complications During Cardiac Surgery. (PLACARD)

2026年6月2日 更新者:Université Catholique de Louvain
The PLACARD research project aims to investigate the impact of CPB-induced platelet modifications during cardiac surgery on the post-operative inflammatory response and bleeding complications. Our objectives are to study the impact of CPB on the formation of procoagulant platelets, to assess changes in platelet lipid profile and bioenergetics before, during and after cardiac surgery, and to connect the ex-vivo observations to post-operative clinical and biological parameters of these patients during their stay in cardiovascular intensive care unit.

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

Cardiac surgery remains associated with high morbidity and mortality despite improvements in peri and post-operative care. Cardiopulmonary bypass (CPB) triggers a sterile inflammatory response, characterized by vascular hyperpermeability, excessive vasodilation, and cardiac arrythmias, i.e. atrial fibrillation. In parallel, major peri-operative bleeding frequently necessitates transfusion of allogeneic blood products. The pathophysiology underlying these complications is multifactorial. Direct contact of blood with the CPB tubing system, combined with ischemia-reperfusion injury, profoundly alters both the inflammatory and haemostatic systems. Among blood components, platelets are particularly vulnerable to CPB-induced alterations. Platelet dysfunction is widely recognized as the main haemostatic defect associated with CPB and a major contributor to post-operative bleeding. Recent findings have demonstrated that platelet lipid metabolism plays a key role in regulating thrombo-inflammatory responses in sepsis. These observations raise the hypothesis that CPB-induced alterations in platelet lipid metabolism may critically modulate the balance between inflammation and haemostasis in cardiac surgery.

The PLACARD project therefore aims to investigate how CPB-induced platelet modifications influence post-operative inflammatory responses and bleeding complications.

Specific objectives:

  1. Characterize the impact of CPB on the formation of procoagulant platelets.
  2. Assess changes in platelet lipid composition and bioenergetics before, during and after cardiac surgery.
  3. Correlate ex-vivo platelet alterations with post-operative clinical outcomes and biological markers during the stay in the cardiovascular intensive care unit.

This project addresses a critical unmet need in cardiac surgery: understanding the mechanistic link between CPB-induced platelet dysfunction and thrombo-inflammatory complications. By focusing on platelet lipid metabolism, a pathway largely unexplored in this context, the project moves beyond traditional platelet function assays. The results are expected to provide fundamental mechanistic insights into procoagulant platelet formation during CPB and may identify novel biomarkers or therapeutic targets to reduce bleeding and inflammatory complications in high-risk surgical patients.

研究の種類

介入

入学 (推定)

100

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

研究連絡先のバックアップ

研究場所

      • Brussels、ベルギー、1200
        • Cliniques Universitaires Saint-luc
        • コンタクト:
        • コンタクト:
        • 副調査官:
          • Richard Coulie, MD
        • 副調査官:
          • Mona Momeni, MD, PhD
        • 主任研究者:
          • Christophe Beauloye, MD, PhD

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:

  • Adult patients (≥ 18 years old) suffering from coronary disease and/or severe valvular dysfunction (mitral or aortic) undergoing elective coronary angiography or cardiac surgery with cardiopulmonary bypass.

Exclusion Criteria:

  • Uninterrupted preoperative dual antiplatelet therapy
  • Active chronic inflammatory disease
  • Recent chemotherapy or immunotherapy (< 3 months)
  • Active solid malignancy
  • History of hematologic malignancy
  • Hemophilia or other coagulopathy
  • History of thrombocytopenia (< 100,000 platelets/mm³)
  • Recent administration of thrombopoietin receptor agonist or immunoglobulins
  • History of thrombopathy, thrombocytosis, or myeloproliferative syndrome
  • History of heparin-induced thrombocytopenia (HIT)
  • Cirrhosis or hepatic fibrosis (with or without hypersplenism)
  • History of splenectomy, regardless of initial indication
  • History of systemic autoimmune disease (e.g., systemic lupus erythematosus, scleroderma, antiphospholipid syndrome, systemic vasculitis)
  • Recent major surgery (< 3 months)
  • Severe renal insufficiency (eGFR ≤ 30 mL/min/m²) with or without dialysis
  • Recent or chronic corticosteroid therapy
  • Recent acute coronary syndrome, STEMI type (< 3 months)
  • Urgent surgery or procedure
  • Preoperative hemodynamic instability

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:基礎科学
  • 割り当て:非ランダム化
  • 介入モデル:並列代入
  • 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:Cathlab patients
This group includes patients with coronary disease and/or valvular disease scheduled for elective coronary angiography.
An arterial blood sample will be obtained at the beginning of the coronary angiography by using the arterial sheat in place, before administration of Heparin.
An arterial blood sample will be obtained via the arterial line before anesthetic induction, 60 minutes after the beginning of cardiopulmonary bypass and 4 hours after the arrival in the intensive care unit
実験的:Cardiac surgery patients
This arm includes patients with coronary disease and/or valvular disease scheduled for elective cardiac surgery with cardiopulmonary bypass.
An arterial blood sample will be obtained at the beginning of the coronary angiography by using the arterial sheat in place, before administration of Heparin.
An arterial blood sample will be obtained via the arterial line before anesthetic induction, 60 minutes after the beginning of cardiopulmonary bypass and 4 hours after the arrival in the intensive care unit

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
Procoagulant platelet formation
時間枠:Throughout the entire study, approximately during 32 months
Ex-vivo flow cytometric assessment of the pourcentage of procoagulant platelet population under basal and stimulated conditions.
Throughout the entire study, approximately during 32 months

二次結果の測定

結果測定
メジャーの説明
時間枠
Platelet lipidomics
時間枠:Throughout the entire study, approximately during 32 months
Assessment of the impact of cardiac surgery and cardiopulmonary bypass on platelet lipid metabolism. Pourcentage of patients with platelet Acety-CoA Carboxylase phosphorylation.
Throughout the entire study, approximately during 32 months
Postoperative bleeding
時間枠:Throughout the entire study, approximately during 32 months
Correlation between the ex-vivo primary outcomes and clinical postoperative parameters (chest drain output (mL) and need for blood transfusion (units of packed red cells, fresh frozen plasma, platelets and fibrinogen)).
Throughout the entire study, approximately during 32 months
Postoperative inflammation
時間枠:Throughout the entire study, approximately during 32 months
Correlation between the ex-vivo primary outcomes and biological postoperative parameters (C-reactive protein).
Throughout the entire study, approximately during 32 months
Postoperative platelet function
時間枠:Throughout the entire study, approximately during 32 months
Correlation between the ex-vivo primary outcomes and biological postoperative parameters (platelet aggregometry results).
Throughout the entire study, approximately during 32 months
Postoperative coagulation
時間枠:Throughout the entire study, approximately during 32 months
Correlation between the ex-vivo primary outcomes and biological postoperative parameters (thromboelastography and standard coagulation results (INR, aPTT, Fibrinogen)).
Throughout the entire study, approximately during 32 months

協力者と研究者

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スポンサー

協力者

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5月15日

一次修了 (推定)

2029年1月1日

研究の完了 (推定)

2030年1月1日

試験登録日

最初に提出

2026年5月7日

QC基準を満たした最初の提出物

2026年6月2日

最初の投稿 (実際)

2026年6月5日

学習記録の更新

投稿された最後の更新 (実際)

2026年6月5日

QC基準を満たした最後の更新が送信されました

2026年6月2日

最終確認日

2026年6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

  • PLACARD

個々の参加者データ (IPD) の計画

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いいえ

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