Temperature Evaluation by MRI Thermometry During Cervical Cooling

Temperature Evaluation by MRI Thermometry During Cervical Cooling


Lead Sponsor: University of Vermont

Collaborator: Cryothermic Systems, Inc.

Source University of Vermont
Brief Summary

The American Heart Association (AHA) recommends cooling (inducing mild hypothermia) patients who were resuscitated following cardiac arrest but who remained comatose. Induced mild hypothermia is now the standard of care for post-resuscitation patients in the intensive care unit (ICU) setting. The use of cooling has recently moved to pre-hospital and emergency department (ED) application as more current studies show that early initiation of cooling significantly improves neurologic outcomes and survival rates instead of waiting until the patient arrives in the ICU to initiate cooling. In the pre-hospital setting chilled saline (4°C) and packing the body in ice have been the primary methods to initiate induced mild hypothermia The Excel Cryo Cooling System is a non-invasive cervical collar (C-collar) that provides cooling to the carotid arteries, the main blood supply to the brain, and allows for the rapid initiation of selective cerebral cooling. The investigators are planning to use MRI-thermometry to see how quickly the Excel Cryo Cooling Collar can drop brain temperature when applied by itself.

Healthy volunteers will be used for this study to provide important temperature data on the effectiveness of the Excel Cryo Cooling System. The investigators will be able to use the data from this project to further the current clinical research in induced mild hypothermia after cardiac arrest.

Overall Status Completed
Start Date April 2015
Completion Date July 2016
Primary Completion Date April 2016
Phase N/A
Study Type Interventional
Primary Outcome
Measure Time Frame
Rate of cooling 45 minutes
Time to drop subject temperature 0.8-3.0°C 45 minutes
Time to induced mild hypothermia threshold (34ºC) 45 minutes
Differences and similarities of inducing mild hypothermia with the Excel Cryo Cooling Collar and normothermia 45 minutes
Secondary Outcome
Measure Time Frame
Relationship between MRI temperature of brain and externally measured temperature 45 minutes
Enrollment 6

Intervention Type: Device

Intervention Name: Cooling pack activated Excel Cryo Cooling Collar

Description: Cooling pack will be activated before insertion into collar. The first cooling pack will be replaced 20 minutes later with a new, activated cooling pack.

Arm Group Label: Cooling present



Inclusion Criteria:

- > 18 years of age

- Understands the risks involved, as detailed in the informed consent

- No MRI risk factors

Exclusion Criteria:

- < 18 years of age & > 60 years of age

- Pregnant

- Any known medical problems that limit activity or decrease blood flow: underactive thyroid (hypothyroidism),poor nutrition, stroke, severe arthritis, Parkinson's disease, dementia, significant mental illness besides clinical depression, spinal cord injuries, recent serious burn, disorders that affect sensation in the extremities (e.g., diabetic neuropathy)dehydration, and any condition that limits activity or restrains the normal flow of blood.

- Taking any medications (except seasonal allergy medication, over-the-counter NSAIDs, acetaminophen, or contraceptives)

- Oral medications that inhibit the body's ability to respond to cold: Antidepressants, antipsychotics/neuroleptics, including phenothiazines, beta blockers, clonidine, meperidine, sedative-hypnotics.

- History of cardiac condition in a family member younger than 40 years

- Inability to fit in the MRI scanner (BMI > 30 kg/m2)

- MRI risk factors (e.g., claustrophobia, heart condition, metal implants, etc), as detailed in the MRI safety questionnaire Heart rate, blood pressure, respiratory rate, or temperature outside of acceptable ranges.

Gender: All

Minimum Age: 18 Years

Maximum Age: 60 Years

Healthy Volunteers: Accepts Healthy Volunteers

Overall Official
Last Name Role Affiliation
Daniel Wolfson, MD Principal Investigator University of Vermont
Facility: University of Vermont Medical Center
Location Countries

United States

Verification Date

September 2016

Responsible Party

Type: Principal Investigator

Investigator Affiliation: University of Vermont

Investigator Full Name: Daniel Wolfson, MD

Investigator Title: Assistant Professor

Has Expanded Access No
Number Of Arms 2
Arm Group

Label: Cooling present

Type: Experimental

Description: Cooling pack activated before start of MRI scan for the condition "cooling present".

Label: No cooling present

Type: No Intervention

Description: Cooling pack will not be activated in the condition "no cooling present".

Acronym TEM-C
Study Design Info

Allocation: Randomized

Intervention Model: Crossover Assignment

Primary Purpose: Basic Science

Masking: None (Open Label)

Source: ClinicalTrials.gov