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Reduced-Dose Versus Full-Dose Alteplase for High-Risk Pulmonary Embolism (REDSTEM)

2026년 9월 14일 업데이트: Kristina Svennerholm, Sahlgrenska University Hospital

Reduced-Dose Versus Full-Dose Systemic Thrombolysis for High-Risk Pulmonary Embolism: A Multicentre, Randomised, Open-Label, Blinded-Endpoint Trial

High-risk pulmonary embolism is a life-threatening condition requiring immediate reperfusion therapy. Full-dose systemic thrombolysis is recommended as first-line treatment, but its use is limited by the risk of major bleeding, including intracranial hemorrhage. Reduced-dose systemic thrombolysis may reduce bleeding while maintaining clinical efficacy, but this strategy has not been adequately evaluated in patients with high-risk pulmonary embolism.

REDSTEM is an international, multicenter, randomized, adaptive, open-label, blinded-endpoint phase 4 trial comparing reduced-dose alteplase with standard full-dose alteplase in adults with acute high-risk pulmonary embolism. The trial will assess whether reduced-dose alteplase preserves early clinical efficacy while reducing severe clinically significant bleeding. Participants will be followed for up to 12 months.

연구 개요

상세 설명

Systemic thrombolysis is recommended as first-line reperfusion therapy for high-risk pulmonary embolism. However, bleeding complications limit its use in clinical practice and contribute to undertreatment of eligible patients. Existing evidence from small randomized trials, observational studies, and meta-analyses suggests that lower-dose thrombolysis may improve safety while maintaining efficacy, but previous studies have included mixed-risk pulmonary embolism populations and only a limited number of patients with high-risk pulmonary embolism.

REDSTEM was designed to evaluate whether a reduced-dose alteplase strategy can provide a more favorable balance between efficacy and safety compared with standard full-dose alteplase in patients with high-risk pulmonary embolism. The study uses randomized treatment allocation, blinded endpoint adjudication, independent safety monitoring, and an adaptive design allowing sample-size re-estimation if required.

The trial includes early clinical assessments during the acute phase and follow-up through 12 months to evaluate clinical outcomes, safety, functional recovery, quality of life, and health care resource utilization.

연구 유형

중재적

등록 (추정된)

400

단계

  • 4단계

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 연락처

연구 연락처 백업

연구 장소

      • Bergen, 노르웨이, 5021
        • Haukeland University Hospital
        • 연락하다:
          • Lasse Melvear Gii, MD, PhD
      • Drammen, 노르웨이, 3004
        • Drammen Hospital
        • 연락하다:
          • Jonas Pivoriunas, MD, PhD
      • Grålum, 노르웨이, 1714
        • Ostfold Hisptal
        • 연락하다:
          • Hans Joakim Myklebust-Hansen, MD
      • Lörenskog, 노르웨이, 1478
        • Akershus University Hospital
        • 연락하다:
          • Hamza Nahoui, MD
      • Oslo, 노르웨이, 0450
        • Oslo University Hospital, Ullevål
        • 연락하다:
          • Mari Asphjell Björnaas, MD, PhD
      • Stavanger, 노르웨이, 4021
        • Stavanger University Hospital
        • 연락하다:
          • Trond Johan Cooper, MD
      • Copenhagen, 덴마크
        • Rigshospitalet
        • 연락하다:
          • Jesper Kjaergaard, MD, PhD
      • Falun, 스웨덴
        • Falun Hospital
        • 연락하다:
          • Jessica Silfverberg, MD
      • Gothenburg, 스웨덴
        • Sahlgrenska University Hospital/Östra
        • 연락하다:
          • Katarina Glise Sandblad, MD, PhD
      • Jönköping, 스웨덴
        • Ryhov County Hospital
        • 연락하다:
          • Antheia Kissopoulou, MD, PhD
      • Lund, 스웨덴
        • Skåne University Hospital, Lund
        • 연락하다:
          • Marcus Ohlsson, MD
      • Malmö, 스웨덴
        • Skåne University Hospital, Malmö
        • 연락하다:
          • Marcus Ohlsson, MD, PhD
      • Mölndal, 스웨덴
        • Sahlgrenska University Hospital/Mölndal
        • 연락하다:
          • Louise Martinell, MD, PhD
      • Norrtälje, 스웨덴
        • Norrtälje Hospital
        • 연락하다:
          • Sune Forsberg, MD, PhD
      • Skövde, 스웨덴
        • Skaraborgs Hospital Skövde
        • 연락하다:
          • Freyr Einarsson, MD
        • 연락하다:
          • Erik Ullemark, MD
      • Stockholm, 스웨덴
        • Danderyd Hospital
        • 연락하다:
          • Nina Olausson, MD, PhD
      • Stockholm, 스웨덴
        • Karolinska University Hospital, Solna
        • 연락하다:
          • Therese Djärv, MD, PhD
      • Stockholm, 스웨덴
        • Karolinska University Hospital, Huddinge
        • 연락하다:
          • Therese Djärv, MD, PhD
      • Stockholm, 스웨덴
        • Capio S:t Göran's Hospital
        • 연락하다:
          • Rickard Markgren, MD, PhD
      • Stockholm, 스웨덴
        • Södersjukhuset, Stockholm South General Hospital
        • 연락하다:
          • Jacob Hollenberg, MD, PhD
      • Umeå, 스웨덴
        • University Hospital of Umeå
        • 연락하다:
          • Johanna Pennlert, MD, PhD
      • Uppsala, 스웨덴
        • Uppsala University Hospital
        • 연락하다:
          • Sofia Vikman, MD, PhD
    • Västra Götaland County

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

  • 성인
  • 고령자

건강한 자원 봉사자를 받아들입니다

아니

설명

Inclusion Criteria:

  1. Participant aged 18 years or older.
  2. Acute pulmonary embolism verified by computed tomography pulmonary angiography or pulmonary angiography. In hemodynamically unstable participants unable to undergo immediate imaging, presumed pulmonary embolism may be diagnosed based on bedside echocardiographic findings consistent with acute right ventricular pressure overload and high clinical suspicion of pulmonary embolism, provided that alternative causes of hemodynamic instability have been reasonably excluded. In such cases, the treating clinician must have independently decided to initiate thrombolytic therapy irrespective of study participation, and confirmatory imaging demonstrating pulmonary embolism must be performed as soon as clinically feasible.
  3. High risk for early death, defined by at least one of the following:

    1. High-risk pulmonary embolism according to European Society of Cardiology criteria:

      • Cardiac arrest with return of spontaneous circulation;
      • Obstructive shock, defined as systolic blood pressure <90 mmHg or use of vasopressors to maintain systolic blood pressure ≥90 mmHg despite adequate filling status, together with end-organ hypoperfusion such as elevated serum lactate >2 mmol/L, altered mental status, or cold clammy skin;
      • Persistent hypotension, defined as systolic blood pressure <90 mmHg or a drop in systolic blood pressure ≥40 mmHg for longer than 15 minutes, not caused by new-onset arrhythmia, hypovolemia, or sepsis.
    2. Abnormal right ventricular function on echocardiography or computed tomography pulmonary angiography, defined as right ventricular/left ventricular ratio ≥1.0, and elevated cardiac troponin above the local upper reference limit, and acute respiratory failure not primarily caused by underlying lung disease, defined as requiring facemask oxygen supplementation ≥12 L/min, high-flow nasal oxygen, or non-invasive ventilation with FiO2 ≥60% to reach oxygen saturation ≥94%.
  4. Female participants of childbearing potential must have a negative urine or serum pregnancy test.

Exclusion Criteria:

  1. Catastrophic pulmonary embolism, defined as ongoing cardiac arrest and/or need for extracorporeal cardiopulmonary resuscitation and/or immediate VA-ECMO as judged by the treating physicians.
  2. Known hypersensitivity to alteplase or any of its excipients.
  3. Contraindication to systemic thrombolysis with one or more of the following:

    • History of hemorrhagic stroke;
    • Ischemic stroke within the previous 6 months;
    • Central nervous system neoplasm;
    • Major trauma, major surgery, or major head injury within the previous 3 weeks;
    • Active life-threatening bleeding, bleeding into a critical organ or area, or known severe bleeding diathesis;
    • Chronic use of full-dose oral or parenteral anticoagulation before presentation.
  4. The participant has already received reperfusion treatment for the index pulmonary embolism before randomization, including systemic thrombolysis, surgical embolectomy, or catheter-directed intervention.
  5. Pregnancy.
  6. Current participation in another study that would interfere with participation in this trial.
  7. Any other condition that would put the participant at unacceptable risk from the trial interventions as judged by the treating clinician.
  8. In countries where required by national regulations: lack of affiliation to a social security system or equivalent health insurance coverage.

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

  • 주 목적: 치료
  • 할당: 무작위
  • 중재 모델: 병렬 할당
  • 마스킹: 하나의

무기와 개입

참가자 그룹 / 팔
개입 / 치료
실험적: Reduced-Dose Alteplase
Participants randomized to reduced-dose systemic thrombolysis will receive alteplase 0.6 mg/kg body weight, up to a maximum dose of 50 mg, administered intravenously over 15 minutes.
Alteplase 0.6 mg/kg body weight, maximum 50 mg, administered as an intravenous infusion over 15 minutes
다른 이름들:
  • Reduced-dose systemic thrombolysis, Low-dose alteplase, tPA
활성 비교기: Full-Dose Alteplase
Participants randomized to standard full-dose systemic thrombolysis will receive alteplase 1.5 mg/kg body weight, up to a maximum dose of 100 mg, administered as a 10 mg intravenous bolus over 1 to 2 minutes followed by a 90 mg intravenous infusion over 2 hours.
Alteplase 1.5 mg/kg body weight, maximum 100 mg, administered as a 10 mg intravenous bolus over 1 to 2 minutes followed by 90 mg as an intravenous infusion over 2 hours.
다른 이름들:
  • Full-dose systemic thrombolysis, Standard-dose alteplase, tPA

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Incidence of composite efficacy endpoint
기간: Within 7 days after randomization
Incidence of a composite endpoint comprising all-cause mortality within 7 days, cardiopulmonary resuscitation and/or veno-arterial extracorporeal membrane oxygenation within 7 days, recurrent pulmonary embolism within 7 days, clinical deterioration within 24 hours, and lack of clinical improvement at 6 hours.
Within 7 days after randomization
Key secondary endpoint - Incidence of severe clinically significant bleeding
기간: Within 7 days after randomization
Incidence of severe clinically significant bleeding, defined as major bleeding according to International Society on Thrombosis and Haemostasis criteria or bleeding requiring urgent medical intervention.
Within 7 days after randomization

2차 결과 측정

결과 측정
측정값 설명
기간
All-cause mortality
기간: At 7 days and 30 days after randomization
Incidence of death from any cause.
At 7 days and 30 days after randomization
Pulmonary embolism-related mortality
기간: At 7 days and 30 days after randomization
Incidence of pulmonary embolism-related death.
At 7 days and 30 days after randomization
Cardiopulmonary resuscitation and/or VA-ECMO
기간: Within 7 days after randomization
Incidence of cardiopulmonary resuscitation and/or veno-arterial extracorporeal membrane oxygenation.
Within 7 days after randomization
Incidence of clinical deterioration
기간: Within 24 hours after randomization
Incidence of life-threatening hemodynamic or respiratory decline requiring cardiopulmonary resuscitation, endotracheal intubation, or VA-ECMO, or an increase in SCAI SHOCK stage after investigational medicinal product administration.
Within 24 hours after randomization
Lack of clinical improvement assessed by SCAI SHOCK stage and oxygen requirement
기간: At 6 hours after randomization
Incidence of unchanged SCAI SHOCK stage or unchanged or rising fraction of inspired oxygen required to maintain oxygen saturation of at least 94%.
At 6 hours after randomization
Time to clinical stabilization based on predefined hemodynamic and respiratory criteria
기간: From randomization until clinical stabilization, assessed up to 7 days after randomization
Time from randomization to the time point at which predefined hemodynamic or respiratory stabilization criteria have been continuously fulfilled for at least 30 minutes
From randomization until clinical stabilization, assessed up to 7 days after randomization
Incidence of recurrent pulmonary embolism
기간: At 7 days and 30 days after randomization
Incidence of objectively confirmed recurrent pulmonary embolism.
At 7 days and 30 days after randomization
Initiation of invasive or non-invasive mechanical ventilation
기간: Within 7 days after randomization
Incidence of initiation of invasive or non-invasive mechanical ventilation.
Within 7 days after randomization
Win ratio for efficacy
기간: Within 7 days after randomization
Win ratio based on all-cause mortality, cardiopulmonary resuscitation and/or VA-ECMO, clinical deterioration, lack of clinical improvement, recurrent pulmonary embolism, and time to clinical stabilization.
Within 7 days after randomization
Net clinical benefit
기간: Within 7 days after randomization
Composite net clinical benefit including severe clinically significant bleeding, all-cause mortality, cardiopulmonary resuscitation and/or VA-ECMO, recurrent pulmonary embolism, clinical deterioration, and lack of clinical improvement.
Within 7 days after randomization
Rescue treatment
기간: Before clinical stabilization, up to 7 days after randomization
Need for rescue treatment, defined as additional alteplase, catheter-directed intervention, surgical embolectomy, or VA-ECMO before stabilization.
Before clinical stabilization, up to 7 days after randomization
ICU or high-dependency unit length of stay in days
기간: Within 30 days after randomization
Length of stay in intensive care unit and/or high-dependency unit.
Within 30 days after randomization
Hospital length of stay
기간: Within 30 days after randomization
Length of hospital stay.
Within 30 days after randomization
Major bleeding
기간: At 48 hours, 7 days, and 30 days after randomization
Incidence of major bleeding according to International Society on Thrombosis and Haemostasis criteria.
At 48 hours, 7 days, and 30 days after randomization
Bleeding requiring urgent medical intervention
기간: At 48 hours, 7 days, and 30 days after randomization
Incidence of severe bleeding requiring urgent medical intervention.
At 48 hours, 7 days, and 30 days after randomization
Intracerebral bleeding
기간: Within 7 days after randomization
Incidence of intracerebral bleeding.
Within 7 days after randomization

기타 결과 측정

결과 측정
측정값 설명
기간
All-cause mortality at 12 months
기간: At 12 months after randomization
Incidence of death from any cause.
At 12 months after randomization
At 12 months after randomization
기간: At 12 months after randomization
Incidence of objectively confirmed recurrent pulmonary embolism.
At 12 months after randomization
Persistent dyspnea assessed using the modified Medical Research Council scale
기간: At 3 months and 12 months after randomization
Persistent dyspnea assessed using the modified Medical Research Council scale.
At 3 months and 12 months after randomization
Functional status assessed using the Post-VTE Functional Status Scale
기간: At 3 months and 12 months after randomization
Functional status assessed using the post-VTE functional status (PVFS) scale. Scores range from 0 to 4, where 0 indicates no functional limitations and 4 indicates severe functional limitations. Higher scores indicate worse functional status. Death before the scheduled assessment is recorded as grade D.
At 3 months and 12 months after randomization
Exercise tolerance assessed using the 6-minute walk test
기간: At 3 months and 12 months after randomization
Exercise tolerance assessed using the 6-minute walk test, reported as distance walked in meters. A greater distance indicates better exercise tolerance.
At 3 months and 12 months after randomization
Persistent right ventricular dysfunction assessed by echocardiography
기간: At 3 months and/or 12 months after randomization
Persistent right ventricular dysfunction according to echocardiography report, when performed as clinically indicated.
At 3 months and/or 12 months after randomization
Pulmonary embolism-specific quality of life assessed using the PEmb-QoL questionnaire
기간: At 3 months and 12 months after randomization
Pulmonary embolism-specific health-related quality of life assessed using the Pulmonary Embolism Quality of Life (PEmb-QoL) questionnaire. The PEmb-QoL summary score ranges from 0 to 100, with higher scores indicating worse health-related quality of life.
At 3 months and 12 months after randomization
Health-related quality of life assessed using EQ-5D-5L
기간: At 3 months and 12 months after randomization
Health-related quality of life assessed using the EuroQol 5-Dimension 5-Level (EQ-5D-5L) instrument.
At 3 months and 12 months after randomization
Chronic thromboembolic pulmonary hypertension
기간: At 12 months after randomization
Incidence of chronic thromboembolic pulmonary hypertension.
At 12 months after randomization
Health care resource utilization
기간: During 12 months after randomization
Cost of health care resource utilization during the 12-month follow-up period.
During 12 months after randomization

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

수사관

  • 수석 연구원: Kristina Svennerholm, Sahlgrenska University Hospital / University of Gothenburg

간행물 및 유용한 링크

연구에 대한 정보 입력을 담당하는 사람이 자발적으로 이러한 간행물을 제공합니다. 이것은 연구와 관련된 모든 것에 관한 것일 수 있습니다.

일반 간행물

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작 (추정된)

2026년 12월 1일

기본 완료 (추정된)

2030년 1월 31일

연구 완료 (추정된)

2031년 1월 31일

연구 등록 날짜

최초 제출

2026년 9월 2일

QC 기준을 충족하는 최초 제출

2026년 9월 10일

처음 게시됨 (실제)

2026년 9월 14일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2026년 9월 17일

QC 기준을 충족하는 마지막 업데이트 제출

2026년 9월 14일

마지막으로 확인됨

2026년 9월 1일

추가 정보

이 연구와 관련된 용어

개별 참가자 데이터(IPD) 계획

개별 참가자 데이터(IPD)를 공유할 계획입니까?

예

IPD 계획 설명

De-identified individual participant data underlying the published results may be shared upon reasonable request after publication. Access will require approval by the sponsor and principal investigator, a scientifically sound proposal, scientific collaboration with the trial investigators, compliance with applicable ethical, regulatory, data protection, and consent requirements, and a signed data sharing agreement.

IPD 공유 기간

After publication of the trial results.

IPD 공유 액세스 기준

Reasonable request, subject to approval by the sponsor and principal investigator and applicable legal, ethical, and data protection requirements.

IPD 공유 지원 정보 유형

  • 연구_프로토콜
  • 수액

약물 및 장치 정보, 연구 문서

미국 FDA 규제 의약품 연구

아니

미국 FDA 규제 기기 제품 연구

아니

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

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