Comparison of Intraoperative Warming Devices

Intraoperative Warming: Comparison of Performance of the Dynatherm Medical vitalHeat™ Temperature Management System (vH2) and the Arizant Bair Hugger System

The sublingual (under the tongue) core temperature within 10 minutes of arrival in the post anesthesia care unit (PACU) for patients warmed with the Dynatherm vitalHeat2 (VH2) System under general anesthesia for total knee arthroplasty will be equivalent to that of patients warmed with the Arizant Bair Hugger System.

Inclusion Criteria:

• Initial total knee arthroplasty.
• Expected duration of surgery at least 2 hours.
• General anesthesia.
• American Society of Anesthesiologists (ASA) classification I-III.
• Age >= 18 years.

Exclusion Criteria:

• Skin abrasion at the device application site.
• History of peripheral vascular disease.
• History of allergic skin conditions of the upper extremities.
• History of malignant hyperthermia.