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NCT Number: NCT06473207

Neuroprotective Effect of Remote Ischemic Post-conditioning in Out-of-hospital Cardiac Arrest

Patients admitted to intensive care unit (ICU) following an out-of-hospital cardiac arrest (OHCA) have a high morbidity and mortality rate, primarily due to ischemia-reperfusion (I/R) syndrome leading to anoxic-ischemic brain injury. Despite current recommended advanced life support therapies, no specific treatment or procedure has yet been shown to improve the neurological outcome of such patients.

Remote ischemic post-conditioning (RIPOST) which usually consists of applying brief and repeated cycles of ischemia alternating with reperfusion by inflating and deflating a blood pressure cuff or a pneumatic tourniquet placed around a limb, is a promising strategy to protect organs against I/R injury, including brain. Regarding cardiac arrest, pre-clinical studies have demonstrated an improvement in neurological outcome in animal subjects treated with RIPOST after cardiopulmonary resuscitation.

The aim of our study is to demonstrate the benefit of early RIPOST in OHCA patients in reducing neurological injury and organ failure related to I/R syndrome.

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Key information

Conditions

Out-Of-Hospital Cardiac Arrest Cardiovascular Diseases Heart Arrest Heart Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Centre Hospitalier Intercommunal Toulon-La Seyne sur Mer

Toulon, Var, 83100, France

Location status: Recruiting

Location contact

Jonathan Chelly, MD

CONTACT

[email protected]

0494145124 ext. +33

About this study

The RIPOST trial is a prospective, single-center, randomized, open-label, parallel group trial.

Patients with inclusion criteria will be randomized in two parallel groups:

  • Experimental group: standard of care associated to 3 RIPOST sessions : one within the 4 hours following cardiac arrest, one 12 hours after cardiac arrest and one 24 hours after cardiac arrest. A RIPOST session = four cycles of cuff inflation to 200 mmHg for five minutes and then deflation to 0 mmHg for another five minutes, using an inflatable thigh tourniquet (total duration of the session = 40 minutes).
  • Control group: standard of care associated to 3 sham sessions at inclusion, 24, and 48 hours after inclusion. A sham session = application of the thigh tourniquet during 40 minutes without any inflation.

Inclusion duration: 36 months

Patient participation duration: 3 months

Study duration: 39 months

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Out-of-hospital cardiac arrest with stable return of spontaneous circulation (ROSC > 20 minutes)
  • Patient receiving invasive mechanical ventilation for coma (Glasgow score < 8)
  • Availability of a lower limb without intravenous infusion or tension cuff positioned on it
  • Randomization and application of the first session of the tested procedure within 4 hours after ROSC
  • Consent of a next-of-kin or inclusion in emergency procedure

Exclusion criteria

  • Age < 18 y.o or pregnancy
  • Patient unable to walk without assistance, unable to support himself properly without assistance, bedridden, incontinent and requiring nursing constant attention and care (corresponding to a mRS equal to 4 or 5)
  • Interval between cardiac arrest and ROSC (no flow + low flow) estimated > 60 minutes
  • Unwitnessed cardiac arrest with asystole as first rhythm
  • In-hospital cardiac arrest
  • Refractory cardiac arrest (no ROSC considered as stable)
  • Cardiac arrest from traumatic, hemorrhage, stroke or hanging supposed origin
  • Mean arterial pressure < 65mmHg persisting despite appropriate vascular filling and vasopressor and/or inotropic support
  • Active uncontrolled bleeding
  • Contraindication or not possible to use a pneumatic tourniquet on none of the two lower limbs (amputations, intravenous infusion positioned on both lower limbs, tourniquet size incompatible with patient morphology)
  • Implementation of extracorporeal arteriovenous circulation for refractory cardiac arrest or refractory cardiogenic shock before inclusion
  • Patient already included in this study
  • Inclusion in another interventional study which purpose is to improve prognosis after a cardiac arrest
  • Judicial protection measure
  • Patient without French social security

Treatment and study plan

Remote ischemic post conditioning sessions

Other

Three sessions of RIPOST (within the 4 hours following cardiac arrest and then 12 and 24 hours after cardiac arrest), as follows: four cycles of cuff inflation to 200 mmHg for 5 min and then deflation to 0 mmHg for another 5 min (40 min total duration of the intervention), using an inflatable thigh tourniquet

Other names: RIPOST

Sham sessions

Other

Three sessions of a sham procedure (within the 4 hours following cardiac arrest and then 12 and 24 hours after cardiac arrest), as follows : application of a thigh tourniquet during 40 min without any inflation

Other names: Sham

Primary outcomes

  1. Neurofilament light chain (NFL) blood level evolution between 6 and 72 hours after cardiac arrest occurrence

    Time frame: 72 hours after out-of-hospital cardiac arrest occurrence

    Blood samples will be performed at 6 and 72 hours after cardiac arrest to monitor NFL level evolution and this evolution will be compared between both arms (RIPOST and sham groups)

Secondary outcomes

  1. Sepsis organ failure assessment score (SOFA)

    Time frame: 72 hours after out-of-hospital cardiac arrest occurrence

    SOFA will be assessed at 24, 48 and 72 hours after cardiac arrest, and compared between both arms

  2. Rate of patients with NFL peak level >500 pg/mL

    Time frame: 72 hours after out-of-hospital cardiac arrest occurrence

    Blood samples will be performed at 6, 24, 48 and 72 hours after cardiac arrest to monitor NFL peak level and the rate of patients who will present a NFL peak level > 500 pg/mL will be compared between both arms.

  3. Neuron-specific enolase (NSE) blood level evolution between 6 and 72 hours after cardiac arrest occurrence

    Time frame: 72 hours after out-of-hospital cardiac arrest occurrence

    Blood samples will be performed at 6, 24, 48 and 72 hours after cardiac arrest to monitor NSE levels and their evolution will be compared between both arms (RIPOST and sham groups)

  4. S100B protein (PS100B) blood level evolution between 6 and 72 hours after cardiac arrest occurrence

    Time frame: 72 hours after out-of-hospital cardiac arrest occurrence

    Blood samples will be performed at 6, 24, 48 and 72 hours after cardiac arrest to monitor PS100B levels and their evolution will be compared between both arms (RIPOST and sham groups)

  5. ICU mortality rate from multi-organ failure and from neurological injury

    Time frame: At intensive care unit (ICU) discharge, up to 28 days

    Death mode at ICU discharge will be collected in both arms

  6. Modified Rankin Scale (mRS)

    Time frame: 90 days after out-of-hospital cardiac arrest occurrence

    Modified Rankin Scale (mRS) will be assessed for both arms, at patient's ICU discharge and at day 90 after inclusion. This scales goes from 0 to 6, 0 corresponding to the absence of cognitive deficits and 6 to death.

  7. Post out-of-hospital cardiac arrest event occurrence

    Time frame: 24 hours after out-of-hospital cardiac arrest occurrence

    Post out-of-hospital cardiac arrest event occurrence will be compared between both arms within the 24 hours following cardiac arrest. Events that will be considered are : unexpected cardiac arrest in ICU, iatrogenic events, limb ischemia, occlusive syndrome, digestive ischemia and thromboembolic complications.

Study contacts

Contact information is provided by the study sponsor or research team.

Chelly Jonathan, MD

CONTACT

[email protected]

0494145124 ext. +33

Sponsors and collaborators

Lead sponsor

Centre Hospitalier Intercommunal de Toulon La Seyne sur Mer

Other

Collaborators

  • French Society for Intensive Care

Registry information

Official study title

Neuroprotective Effect of Remote Ischemic Post-conditioning in Out-of-hospital Cardiac Arrest : a Randomized Open Label Controlled Trial

Acronym: RIPOST-CA

Important dates

Study start
2025
Primary completion
2028
Study completion
2028
First posted
Jun 25, 2024
Registry last updated
Jul 7, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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