Ischemic Stroke, Hypothermia
Conditions
Keywords
Acute Ischemic Stroke, Mild Hypothermia, Stroke, Hypothermia
Brief summary
The purpose of this study is to determine whether reducing a patients body temperature (mild hypothermia of 33 degrees Centigrade) will significantly reduce the risk of brain injury (notably reperfusion injury and hemorrhagic conversion) in patients that have suffered a significant interruption of blood flow to an area of brain (occlusion of large proximal cerebral artery) and have undergone successful removal of that interruption (revascularization).This will be achieved by comparing patients that have undergone hypothermia to those that have not.
Detailed description
This study is designed to examine the safety and proof of concept of therapeutic hypothermia prior to conventional revascularization in subjects experiencing acute ischemic stroke by comparing the results to subjects who remain at normal body temperature (normothermic) and proceed directly to reperfusion via conventional reperfusion intervention. The investigational plan also examines the following outcomes in 85 subjects randomized to either hypothermia or normothermia: * Regulation of biomarkers indicative of ischemia-reperfusion injury * Changes in blood brain injury using the Hyperintense Acute Reperfusion Marker (HARM) protocol MRI as a surrogate imaging biomarker * Incidence of hemorrhagic conversion post reperfusion * Neurologic function at 90 days post acute ischemic stroke. The results of this study will be used to power a definitive phase III clinical trial evaluating the combination of hypothermia and revascularization versus reperfusion alone.
Interventions
OTHERMild Hypothermia
Hypothermia will be achieved using the Zoll Thermoguard XP technology with the Quattro catheter. This catheter has a 9.3 Fr diameter and is 4 3cm long. It will be placed in the patients femoral vein via Seldinger technique, before reperfusion is achieved. Hypothermia will be initiated prior to reperfusion. Once temperature has reached 33.5 degrees centigrade the patient will remain at that temperature for 12 hours after which the patient will undergo active gradual rewarming at 0.2 degrees centigrade per hour.
Sponsors
WellStar Health System
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 85 Years
Healthy volunteers
No
Inclusion criteria
* Male or female subjects of any ethnicity and age \>/=18 but \</= 85 years; * Symptom onset \</=8 hours; * Symptoms consistent with an ischemic stroke with a large vessel occlusion (Middle Cerebral Artery (MCA), Internal Carotid Artery (ICA) terminus) as determined by vascular imaging, CT or MRI; * Alberta Stroke Program Early CT Score (ASPECTS) of 5-10 on non-contrast CT of the brain; * Ability to undergo endovascular reperfusion therapy; * No contraindications to general anesthesia or allergies to any components associated with the anticipated diagnostic or treatment procedures that cannot be treated; * A pre-treatment modified Rankin Scale (mRS) of 0 or 1; * Arterial puncture performed under 8 hours from symptom onset or last seen normal * Baseline MRI or CT scan shows no hemorrhage; * National Institutes of Health Stroke Scale (NIHSS) 14-29; * Subject has either 1) failed iv tissue plasminogen activator (tPA) therapy or 2) contradicted for iv tPA therapy; * Subject is capable of complying with study procedures and agrees to complete all required study procedures, study visits and associated activities. * Subject must be able to understand and give written informed consent.
Exclusion criteria
* Females of childbearing potential who are pregnant or not using adequate contraception; * Bleeding diathesis with a platelet count \< 50,000 or International Normalized Ratio (INR) \>1.5 or any active or recent (within 10 to 30 days) hemorrhage; * History of genetically confirmed hypercoagulable syndrome; * Any condition that excludes MRI imaging; * History of dementia, currently on Aricept or Namenda, or other Alzheimer's like symptoms; * End stage renal disease on hemodialysis; * History of cardiac arrest; * Presence of an inferior vena cava (IVC) filter; * Contrast dye allergy with history of anaphylaxis, known serious sensitivity to contrast agents or any condition in which angiography is contraindicated; * Known allergy to meperidine or buspar; * Sustained hypertension (systolic blood pressure (SBP) \> 185 or diastolic blood pressure (DBP) \> 110 refractory to treatment); * Baseline CT/MRI of head showing evidence of mass effect with mid-line shift, hemorrhage, intracranial tumor, arterial vasculitis or dissection, or bilateral stroke; * Presence of any other serious comorbidity that would be likely to impact life expectancy to less than 6 months or limit subject cooperation or study compliance; * Concurrent participation in an investigational clinical study that has not completed the follow-up period or planned participation in another study within the next 3 months; * Subject has any other condition or personal circumstance that, in the judgment of the investigator, might interfere with the collection of complete, good quality data or the completion of the research study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Number of participants with adverse events | 90 days | Evaluation and determination of the following complications pneumonias, central line infections, intra-cerebral hemorrhages, systemic hemorrhages, transient cerebral ischemia, and new strokes. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Hyperintense Acute Reperfusion Marker (HARM) | 48+/- 24 hours | HARM is a MRI sequence looking at gadolinium enhancement on FLAIR MRI imaging. |
| Hemorrhagic Conversion | 48hrs | Acute bleeding into the area of the original stroke based on CT or MRI of the head. |
| National Institutes of Health Stroke Scale (NIHSS) | 90 days | NIHSS is a scale from 1-42 to evaluate stroke severity |
| Modified Rankin Scale (mRS) | 90 days | mRS is a straightforward evaluation of the functional limitations from stroke |
| Biomarkers | Before therapy then immediately after, 8hrs, and 24hrs after reperfusion | These biomarkers are indicative of ischemia-reperfusion injury |
Countries
United States
Outcome results
None listed