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Clinical Research Study With Clazosentan to Evaluate Its Effects on Preventing Complications Due to the Narrowing of the Blood Vessels (Vasospasm) in the Brain, Caused by Bleeding Onto the Surface of the Brain (REACT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03585270
Recruitment Status : Recruiting
First Posted : July 12, 2018
Last Update Posted : July 26, 2019
Information provided by (Responsible Party):
Idorsia Pharmaceuticals Ltd.

Brief Summary:
This study will evaluate if clazosentan (on top of normal routine medical care) can reduce the risk of developing complications related to cerebral vasospasm and permanent brain damage as compared to normal routine medical care alone.

Condition or disease Intervention/treatment Phase
Aneurysmal Subarachnoid Hemorrhage Drug: Clazosentan Drug: Placebo Phase 3

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 400 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Masking Description: This study will be performed in a double-blind fashion. The investigator, study personnel, subjects, clinical research associates (CRAs), sponsor personnel, and vendor / Contract Research Organization (CRO) personnel involved in the conduct of the study will remain blinded to the study treatment received by the subjects during the double-blind treatment period until study closure
Primary Purpose: Prevention
Official Title: A Prospective, Multi-center, Double-blind, Randomized, Placebo-controlled, Parallel-group, Phase 3 Study to Assess the Efficacy and Safety of Clazosentan in Preventing Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI), in Adult Subjects With Aneurysmal Subarachnoid Hemorrhage (aSAH)
Actual Study Start Date : April 1, 2019
Estimated Primary Completion Date : November 1, 2020
Estimated Study Completion Date : January 19, 2021

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Bleeding

Arm Intervention/treatment
Experimental: Clazosentan Drug: Clazosentan
Clazosentan will be administered as a continuous I.v infusion at the dose of 15 mg/h
Other Name: ACT-108475

Placebo Comparator: Placebo Drug: Placebo
Placebo will be administered at the same corresponding infusion rate

Primary Outcome Measures :
  1. Occurrence of clinical deterioration due to delayed cerebral ischemia (DCI) from study drug initiation up to 14 days post-study drug initiation [ Time Frame: Up to 14 days post-study drug initiation ]
    Clinical deterioration due to DCI is defined as a worsening of at least 2 points compared to the reference score, on the mGCS or the aNIHSS, lasting for at least 2 hours, which cannot be entirely attributed to causes other than cerebral vasospasm. It is centrally adjudicated by the CEC based on a written charter and review of clinical data, case narratives, angiograms and CT scans

Secondary Outcome Measures :
  1. Occurrence of all-cause new or worsened cerebral infarction* ≥ 5 cm3 (total volume) at Day 16 post-study drug initiation [ Time Frame: At Day 16 post study drug initiation ]
    New or worsened infarcts are determined by central radiology review comparing the CT scan performed 16 days after study drug initiation with the CT scan performed just prior to randomization.

  2. Long-term clinical outcome assessed by the Glasgow Outcome Scale Extended (GOSE) at Week 12 post-aSAH, dichotomized as follows: poor outcome (score ≤ 4) and good outcome (score > 4) [ Time Frame: At Week 12 post-aSAH ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Written informed consent to participate in the study must be obtained from the subject or proxy/legal representative at any time from hospital admission to prior to initiation of any study-mandated procedure,
  2. Males and females aged 18 to 70 years (inclusive, at hospital admission),
  3. Subjects with a ruptured saccular aneurysm, angiographically confirmed by DSA or CTA, which has been successfully secured within 72 hours of rupture, by surgical clipping or endovascular coiling,
  4. WFNS (World Federation of Neurosurgical Societies) grades 1-4 (based on Glasgow Coma Scale [GCS]) assessed after recovery from the aneurysm-securing procedure and after external ventricular drainage for hydrocephalus, if required,
  5. Subjects must meet one of the two following inclusion criteria:

    A) High-risk prevention: Subjects with a "thick and diffuse clot" (thick and diffuse is defined as a thick confluent clot, more than 4 mm in thickness, involving 3 or more basal cisterns) on the hospital admission CT scan, absence of cerebral vasospasm at the time of randomization, and possibility to start study drug in the ICU (or equivalent environment where all protocol assessments can be performed and the Patient Management Guidelines followed), within 96 hours after the time of the aneurysm rupture,


    B) Early treatment: Subjects without a thick and diffuse clot on the hospital admission CT scan who develop asymptomatic or minimally symptomatic moderate to severe angiographic vasospasm, within the 14-day period post-aneurysm rupture, and for whom it is possible to start study drug in the ICU (or equivalent environment where all protocol assessments can be performed and the Patient Management Guidelines followed), within 24 hours of this angiographic diagnosis,

  6. Presence of a cerebral CT scan, performed at least 8 hours postaneurysm-securing procedure and within 24 hours prior to randomization, which rules out a significant (e.g., symptomatic) new or worsened cerebral infarct or re-bleeding of the repaired aneurysm,
  7. A woman of childbearing potential is eligible only if the pregnancy test performed during the screening period is negative.

Exclusion Criteria:

aSAH, aneurysm-securing procedure, vasospasm:

  1. Subjects with SAH due to causes other than a saccular aneurysm (e.g., trauma or rupture of fusiform or mycotic aneurysms, SAH associated with arterio-venous malformation, vertebral dissections),
  2. Significant bleeding post aneurysm-securing procedure (e.g., due to intra-ventricular drain, intra-cerebral hemorrhage, epidural hematoma, vessel dissection or rupture, re-bleeding of the repaired aneurysm), based on investigator judgment,
  3. Intra-or peri-aneurysm securing procedure complication requiring non-routine medical or interventional treatment such as administration of an antithrombotic or anti-platelet agent (e.g., abciximab), which is not completely resolved prior to randomization,
  4. Intraventricular hemorrhage on the hospital admission CT scan, filling more than 50% of both lateral ventricles and with involvement of the 3rd and 4th ventricles.
  5. Intracerebral hemorrhage on the hospital admission CT scan, with an approximate volume of > 50 mL,
  6. Presence of cerebral vasospasm at hospital admission (initial admission or transfer from another hospital) believed to be associated with a prior bleed (i.e., occurring before the bleed for which the subject is currently hospitalized). Vasospasm occurring during the aneurysm securing procedure is not an exclusion criterion,

    Neurological and functional status:

  7. Subjects with a new major neurological deficit occurring post aneurysm-securing procedure which is attributable to the procedure and does not improve to pre-procedure status before randomization,
  8. Subjects with a GCS score of ≤ 9 at the time of randomization and without intracranial pressure (ICP) monitoring,
  9. Modified Rankin Score of 3 or higher, prior to the aSAH (i.e., due to a chronic condition),

    Other clinical considerations:

  10. Subjects with total bilirubin > 2 times the upper limit of normal, and/or a known diagnosis or clinical suspicion of liver cirrhosis or moderate to severe hepatic impairment,
  11. Hypotension (systolic blood pressure [SBP] ≤ 90 mmHg) at time of randomization that is refractory to treatment,
  12. Unresolved pulmonary edema or significant pneumonia still present at the time of randomization, or severe hypoxia at the time of randomization in intubated subjects, defined as PaO2/FiO2 ≤ 200,
  13. High sustained ICP (> 25 mmHg lasting > 20 minutes) at time of randomization, despite optimal treatment, in subjects with ICP monitoring,
  14. Severe cardiac failure requiring inotropic support at the time of randomization.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03585270

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Contact: Clinical Trial Disclosure desk +18566613721

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Sponsors and Collaborators
Idorsia Pharmaceuticals Ltd.
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Study Director: Clinical Trials Idorsia Pharmaceuticals Ltd.

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Responsible Party: Idorsia Pharmaceuticals Ltd. Identifier: NCT03585270     History of Changes
Other Study ID Numbers: ID-054-304
First Posted: July 12, 2018    Key Record Dates
Last Update Posted: July 26, 2019
Last Verified: July 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No

Additional relevant MeSH terms:
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Subarachnoid Hemorrhage
Pathologic Processes
Intracranial Hemorrhages
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Vascular Diseases
Cardiovascular Diseases