WarmSmart Warming Protocol

Status Withdrawn

Clinical Trial Summary

Hypothermia during surgery and in the postoperative period is associated with adverse outcomes including impaired drug metabolism, cardiac morbidity, shivering, impaired immune function, coagulopathy, and increased use of hospital resources. Several clinical studies have demonstrated that maintenance of normothermia during the perioperative period significantly reduces morbidity.

Mercury Biomed has developed a patient-warming system, WarmSmart, that potentially transfers adequate heat through hands and feet based on the physiological principle of peripheral arterio-venous shunt vaso-dilation. The technology works as a two-step process by selective thermal stimulation along the spinal cord to up-regulate blood flow to arterio-venous shunts and triggering arterio-venous shunt vasodilation and by applying circulating water heat exchangers to the palmar and plantar glabrous skin to warm highly perfused shunts in that area.

General anesthesia reduces the vasoconstriction threshold (triggering core temperature) by 1-2°C, thus promoting arteriovenous shunt dilation. It remains unknown, though, whether cervical spine warming further augments arterio-venous shunt dilation during general anesthesia. If spine heating proves unnecessary under anesthesia, Mercury Biomed's WarmSmart warming could be simpler and less expensive. Investigators therefore propose to test the hypothesis that cutaneous heating near the cervical spine does not further augment arterio-venous flow in fingers during general anesthesia.

Investigators propose to enroll ten patients. The patients will be pre-warmed and warmed intraoperatively with forced-air to maintain a core temperature near 36°C.

A ThermaZone® Device capable of heating the cervical spine area will be positioned behind the patient's neck upon arrival in the operating rooms. Additionally a forced-air warmer will be positioned appropriately and activated as soon as practical, usually after prepping and draping. Ambient temperature will be maintained near 20°C.

After about one hour of anesthesia when temperature and other factors are stable, investigators will start a 30-minute observation period. Thereafter investigators will activate the cervical spine warming system for 30 minutes (warming measurement period) and thereafter have a 30 minutes control period again.

Measurements will be recorded such as mean-skin temperature, distal esophageal temperature, MAC fraction, mean-arterial pressure and finger blood flow.

Clinical Trial Description

n/a

Study Design

Related Conditions & MeSH terms

Hypothermia

Clinical Trial Details

NCT number	NCT02812069
Study type	Interventional
Source	The Cleveland Clinic
Contact
Status	Withdrawn
Phase	N/A
Start date	September 2015
Completion date	July 17, 2017

View Details

See also
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Not yet recruiting	`NCT06283771` - The Effect of Heated Socks Developed With Wearable Technology on Hypothermia, Thermal Comfort Perception and Shivering	N/A
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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.