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Reduced-Dose Thrombolysis in Intermediate-Risk Pulmonary Embolism With High-Risk Features (REDUCTION)

2 de novembro de 2026 atualizado por: China National Center for Cardiovascular Diseases

Reduced-Dose Thrombolysis in Intermediate-High Risk Pulmonary Embolism, a Multicenter, Randomized Controlled Trial

Alteplase, a recombinant tissue plasminogen activator (rt-PA), is commonly used for thrombolytic treatment in patients with high-risk acute pulmonary thromboembolism (PTE), whereas the role of thrombolysis in intermediate-risk PTE remains controversial. This multicenter, randomized controlled trial will compare the efficacy and safety of reduced-dose alteplase (25 mg administered intravenously over 2 hours) plus standard anticoagulation with standard anticoagulation alone in patients with intermediate-risk PTE who have high-risk features.

Visão geral do estudo

Status

Ainda não está recrutando

Condições

Intervenção / Tratamento

Descrição detalhada

In patients with intermediate-risk pulmonary embolism (PE), full-dose systemic thrombolysis has been associated with a reduction in the risk of hemodynamic decompensation but an increased risk of major and intracranial bleeding. Previous studies suggest that reduced-dose thrombolysis may improve right ventricular (RV) function while potentially reducing bleeding complications. However, evidence regarding the efficacy and safety of reduced-dose systemic thrombolysis in patients with intermediate risk PE and additional high-risk clinical features remains limited. This study aims to evaluate the efficacy and safety of reduced-dose thrombolytic therapy in this patient population.

The REDUCTION study is a multicenter, randomized, open-label, controlled trial with blinded endpoint assessment and long-term follow-up.

Eligible patients will be randomly assigned in a 1:1 ratio to receive reduced-dose alteplase combined with standard anticoagulation or standard anticoagulation alone. Randomization will be centrally managed and stratified by participating center.

Patients will receive:

  • Reduced-dose alteplase group: Alteplase 25 mg administered by intravenous infusion over 2 hours, followed by standard anticoagulation with low-molecular-weight heparin (LMWH) or unfractionated heparin (UFH) for at least 5 days.
  • Standard anticoagulation group: Standard anticoagulation with LMWH or UFH for at least 5 days without thrombolytic therapy.

The primary objective is to assess the efficacy of reduced-dose alteplase in improving RV function at 48 hours, as measured by the change in the ratio of right ventricular to left ventricular end-diastolic diameters (RVED/LVED) on echocardiography.

The secondary objectives are to evaluate early changes in right ventricular function, clinical deterioration, PE-related mortality, recurrent PE, and bleeding complications. Long-term assessments will evaluate persistent dyspnea, functional status, persistent right ventricular dysfunction, and the occurrence of chronic thromboembolic pulmonary disease (CTEPD) and chronic thromboembolic pulmonary hypertension (CTEPH)

Tipo de estudo

Intervencional

Inscrição (Estimado)

270

Estágio

  • Fase 3

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

  • Nome: Changming Xiong, Prof.
  • Número de telefone: (+86)010-88396798
  • E-mail: xiongcmfw@163.com

Locais de estudo

      • Beijing, China, 100037
        • Chinese Academy of Medical Sciences, Fuwai Hospital
        • Contato:
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 100029
        • China-Japan Friendship Hospital
        • Contato:
      • Beijing, Beijing Municipality, China, 100730
        • Peking Union Medical College Hospital
        • Contato:
          • Juhong Shi, Prof.
          • Número de telefone: 010-69156114
          • E-mail: shijh@pumch.cn
      • Beijing, Beijing Municipality, China, 100029
        • Beijing Anzhen Hospital, Capital Medical University
        • Contato:
      • Beijing, Beijing Municipality, China, 100020
        • Beijing ChaoYang Hospital.Capital Medical University
        • Contato:
          • Yuanhua Yang, Prof.
          • Número de telefone: 010-85231777
          • E-mail: yyh1031@sina.com
    • Guangdong
      • Guangzhou, Guangdong, China, 510120
        • Guangdong Provincial Hospital of Chinese Medicine
        • Contato:
          • Yinji Xu, Prof.
          • Número de telefone: 020-81887233
          • E-mail: xuyinji@163.com
      • Guangzhou, Guangdong, China, 510120
        • The First Affiliated Hospital of Guangzhou Medical University / Guangzhou Institute of Respiratory Health (National Clinical Research Center for Respiratory Disease)
        • Contato:
      • Shenzhen, Guangdong, China, 518116
        • Longgang Central Hospital of Shenzhen
        • Contato:
    • Hebei
      • Zhangjiakou, Hebei, China, 075000
        • The First Affiliated Hospital of Hebei North University
        • Contato:
    • Henan
      • Xinxiang, Henan, China, 453400
        • HeNan Honliv Hospital
        • Contato:
          • Lei Yang, Prof.
          • Número de telefone: 0373-8882288
          • E-mail: 61194255@qq.com
      • Zhengzhou, Henan, China, 450052
        • The First Affiliated Hospital of Zhengzhou University
        • Contato:
      • Zhengzhou, Henan, China, 450003
        • Henan Provincial People's Hospital
        • Contato:
    • Hubei
      • Wuhan, Hubei, China, 430015
        • Wuhan Sixth Hospital (Affiliated Hospital of Jianghan University)
        • Contato:
          • Fajiu Li, Prof.
          • Número de telefone: 027-82426502
          • E-mail: 80670519@qq.com
    • Inner Mongolia
      • Baotou, Inner Mongolia, China, 014010
        • Inner Mongolia Baogang Hospital
        • Contato:
      • Tongliao, Inner Mongolia, China, 028000
        • NMG Keerqin District Hosp.
        • Contato:
    • Jiangsu
      • Changzhou, Jiangsu, China, 213003
        • The Second People's Hospital of Changzhou, The Third Affiliated Hospital of Nanjing Medical University
        • Contato:
      • Nanjing, Jiangsu, China, 210006
        • Nanjing First Hospital
        • Contato:
          • He Xu, Prof.
          • Número de telefone: 025-52271000
          • E-mail: hexunj@163.com
    • Liaoning
      • Shenyang, Liaoning, China, 110024
        • Central Hospital Affiliated to Shenyang Medical College
        • Contato:
          • Shuyue Xia, Prof.
          • Número de telefone: 024-85715200
          • E-mail: syx262@126.com
      • Shenyang, Liaoning, China, 110003
        • General Hospital of Northern Theater Command
        • Contato:
    • Ningxia
      • Yinchuan, Ningxia, China, 750004
        • Ningxia Medical University General Hospital
        • Contato:
    • Shandong
      • Jinan, Shandong, China, 250021
        • Shandong Provincial Hospital
        • Contato:
      • Linyi, Shandong, China, 276000
        • Linyi People's Hospital
        • Contato:
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, China, 200120
        • Shanghai East Hospital, School of Medicine, Tongji University
        • Contato:
    • Sichuan
      • Chengdu, Sichuan, China, 610041
        • West China Hospital, Sichuan University
        • Contato:
    • Tianjin Municipality
      • Tianjin, Tianjin Municipality, China, 300052
        • Tianjin Medical University General Hospital
        • Contato:
      • Tianjin, Tianjin Municipality, China, 300222

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

18 anos a 75 anos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Tudo

Descrição

Inclusion Criteria:

  • Age 18 to 75 years

  • Objectively confirmed acute pulmonary thromboembolism (PTE) with symptom onset within 14 days, based on at least one of the following:

    1. Ventilation/perfusion lung scan showing at least one segmental or larger mismatched perfusion defect;
    2. Computed tomography pulmonary angiography (CTPA) or pulmonary angiography showing a filling defect or abrupt obstruction in a segmental or more proximal pulmonary artery.
  • Intermediate-high-risk PTE, with both of the following:

    1. Right ventricular dysfunction (RVD) on echocardiography or CTPA. Echocardiographic RVD is defined by at least one of the following:(1) right ventricular dilation with RV/LV end-diastolic diameter ratio >1.0; (2) reduced right ventricular free-wall motion; (3) increased tricuspid regurgitation velocity;(4) tricuspid annular plane systolic excursion <16 mm; (5) tricuspid annular systolic velocity (S') <9.5 cm/s. CTPA evidence of RVD is defined as right ventricular dilation with RV/LV end-diastolic diameter ratio >1.0.
    2. Cardiac injury or heart failure biomarker above the local upper limit of normal, including cardiac troponin, BNP, or NT-proBNP.
  • Elevated risk of early death/hemodynamic collapse, indicated by at least one of the following high-risk features: Systolic blood pressure ≤110 mmHg, Heart rate ≥100 beats/min, Oxygen saturation (SpO₂) <90% (respiratory rate >20 breaths/min or arterial partial pressure of oxygen [PaO₂] <60 mmHg).

  • Signed informed consent

Exclusion Criteria:

  • High-risk PTE with hemodynamic instability, including cardiac arrest, obstructive shock, or persistent hypotension defined as systolic blood pressure <90 mmHg or a decrease of ≥40 mmHg from baseline lasting at least 15 minutes, after excluding hypotension caused by new-onset arrhythmia, hypovolemia, or sepsis.

  • Intermediate-low-risk PTE, defined as hemodynamically stable PE with only one of the following findings: right ventricular dysfunction on imaging or elevated cardiac biomarkers.

  • Low-risk PTE, defined as hemodynamically stable PTE without right ventricular dysfunction and without elevated cardiac injury or heart failure biomarkers.

  • Any contraindication to systemic thrombolysis, including:

    1. Known hypersensitivity to alteplase, gentamicin, heparin, low-molecular-weight heparin, or any component of the study treatment;
    2. Active bleeding or high risk of bleeding;
    3. Known or suspected intracranial hemorrhage;
    4. Suspected subarachnoid hemorrhage or aneurysmal subarachnoid hemorrhage;
    5. Significant bleeding disorder within the previous 6 months;
    6. Known bleeding diathesis;
    7. Acute ischemic stroke or transient ischemic attack within the previous 6 months;
    8. Ophthalmic surgery within the previous 3 months, or abdominal, cardiac, thoracic, vascular, or orthopedic surgery or trauma within the previous 3 months;
    9. History of central nervous system disease or trauma, including tumor, aneurysm, head trauma, intracranial surgery, or spinal surgery;
    10. Platelet count <100 × 10^9/L;
    11. International normalized ratio (INR) >1.3;
    12. Current effective oral anticoagulant treatment;
    13. Traumatic cardiopulmonary resuscitation;
    14. Infective endocarditis or pericarditis;
    15. Acute pancreatitis;
    16. Noncompressible vascular puncture;
    17. Severe uncontrolled hypertension, with systolic blood pressure >180 mmHg and/or diastolic blood pressure >110 mmHg;
    18. Any other condition considered by the investigator to confer a high bleeding risk;
    19. Severe liver disease, including liver failure, cirrhosis, portal hypertension, esophageal varices, or active hepatitis;
    20. Gastrointestinal ulcer, esophageal varices, arterial aneurysm, or arteriovenous malformation within the previous 3 months;
    21. Tumor with bleeding tendency;
    22. Pregnancy or within 1 week postpartum;
    23. Diabetes with hemorrhagic retinopathy;
  • Body weight ≤40 kg.

  • Thrombolytic treatment within 30 days before randomization for the current episode of acute PE, including systemic or catheter-directed thrombolysis.

  • Catheter-directed mechanical thrombectomy or surgical pulmonary embolectomy before randomization for the current episode of acute PE.

  • Use of any direct oral anticoagulant within 30 days before randomization.

  • Current dual antiplatelet therapy.

  • Current participation in another interventional clinical trial.

  • Women of childbearing potential who are unwilling to use effective contraception or abstinence during the study.

  • Any other disease or condition that, in the investigator's judgment, would increase treatment risk.

  • Life expectancy <3 months or inability to complete 3-month follow-up.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Solteiro

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Comparador Ativo: Reduced-Dose Alteplase and Standard Anticoagulation

Low-molecular-weight heparin (LMWH) or unfractionated heparin (UFH) and reduced-dose alteplase [25 mg continuous intravenous infusion for 2 hours]

Alteplase 25 mg will be administered by continuous intravenous infusion over 2 hours

Standard anticoagulation will consist of LMWH or UFH administered according to current guideline recommendations for at least 5 days

Comparador Ativo: Standard Anticoagulation

Low-molecular-weight heparin (LMWH) or unfractionated heparin (UFH)

Standard anticoagulation will consist of LMWH or UFH administered according to current guideline recommendations for at least 5 days

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Prazo
Change in the ratio of right ventricular end-diastolic diameter to left ventricular end-diastolic diameter (RVED/LVED) as measured by echocardiography
Prazo: Between baseline and 48 hours
Between baseline and 48 hours

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Change in the ratio of right ventricular end-diastolic diameter to left ventricular end-diastolic diameter (RVED/LVED) as measured by echocardiography
Prazo: Between baseline and 7 days
Between baseline and 7 days
Clinical Deterioration
Prazo: 7 days
7 days
PE-Related Death
Prazo: 7 days

Death caused by pulmonary embolism (PE)

7 days
All cause Death
Prazo: 7 days
7 days
Recurrent PE
Prazo: 7 days
7 days
Persistent Dyspnea
Prazo: 6 months

Persistent Dyspnea Assessed by the Medical Research Council (MRC) Dyspnea Scale

6 months
Functional outcome
Prazo: 6 months

Functional status will be assessed using the Post-Venous Thromboembolism Functional Status (PVFS) Scale, which measures limitations in usual activities and daily functioning after venous thromboembolism. The scale ranges from grade 0 (no functional limitations) to grade 4 (severe functional limitations requiring assistance with activities of daily living). Higher grades indicate greater functional impairment. Grade D indicates death before the scheduled assessment.

6 months
Persistent Right Ventricular Dysfunction
Prazo: 6 months

Persistent right ventricular dysfunction is defined as an intermediate or high probability of pulmonary hypertension on echocardiography according to the European Society of Cardiology (ESC) criteria.

6 months
Chronic thromboembolic pulmonary disease (CTEPD) and/or Chronic thromboembolic pulmonary hypertension (CTEPH)
Prazo: 12 months
12 months
Major bleeding
Prazo: 30 days

Major bleeding will be defined according to the International Society on Thrombosis and Haemostasis (ISTH) criteria as fatal bleeding, symptomatic bleeding in a critical area or organ, a decrease in hemoglobin of ≥2 g/dL, or transfusion of ≥2 units of whole blood or red blood cells. The number of participants experiencing major bleeding will be recorded

30 days
Clinically relevant non-major bleeding
Prazo: 30 days

Clinically relevant non-major bleeding will be defined according to ISTH criteria as bleeding that does not meet the criteria for major bleeding but requires medical intervention, leads to hospitalization or an increased level of care, or prompts a face-to-face evaluation by a healthcare professional. The number of participants experiencing clinically relevant non-major bleeding will be recorded.

30 days
Minor bleeding
Prazo: 30 days

Minor bleeding will be defined as any overt bleeding event that does not meet the criteria for major bleeding or clinically relevant non-major bleeding and does not require medical attention. The number of participants experiencing minor bleeding will be recorded.

30 days

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Investigador principal: Changming Xiong, Prof., Chinese Academy of Medical Sciences, Fuwai Hospital
  • Investigador principal: Zhenguo Zhai, Prof., China-Japan Friendship Hospital

Publicações e links úteis

A pessoa responsável por inserir informações sobre o estudo fornece voluntariamente essas publicações. Estes podem ser sobre qualquer coisa relacionada ao estudo.

Publicações Gerais

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

1 de novembro de 2026

Conclusão Primária (Estimado)

31 de dezembro de 2028

Conclusão do estudo (Estimado)

31 de dezembro de 2029

Datas de inscrição no estudo

Enviado pela primeira vez

15 de outubro de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

2 de novembro de 2026

Primeira postagem (Real)

4 de novembro de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

4 de novembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

2 de novembro de 2026

Última verificação

1 de outubro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • 2026ZD0556203-02
  • 2026ZD0556203 (Número de outro subsídio/financiamento: Noncommunicable Chronic Diseases-National Science and Technology Major Project)

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

NÃO

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .