Two Warming Methods in Knee Arthroplasty
Two Warming Methods in Knee Arthroplasty
In this study two warming methods will be compared in knee arthroplasty surgery. Barrier
 EasyWarm will be used in the study group and BairHugger upper body warming blanket in the
 control group. Both groups will be prewarmed 30 minutes before spinal anaesthesia. In the
 operating room warming will be continued with the same warming method. Primary end point is
 core temperature after arriving to post anaesthesia care unit. Hypothesis is that Barrier
 EasyWarm is not inferior to BairHugger in preventing inadvertent intraoperative hypothermia.

 Few methods exist to measure the core temperature non-invasively. Zero-heat-flux technique is
 used in this study. During the study we will test the accuracy of the 3M BairHugger
 Temperature Monitoring System by placing two sensors onto the patients (n = 30) fore head.
 After that the accuracy of the Dräger Tcore is examined by comparing it with the 3M
 BairHugger Temperature Monitoring System. So the patients (n=30) have both these different
 core temperature monitoring systems on their foreheads. This observational monitoring study
 is performed from the patient number 80 until the end.
Inclusion Criteria:

 -  BMI 25-40

 -  ASA class I-III

 -  elective primary unilateral kneearthroplasty

 -  spinal anaesthesia

 Exclusion Criteria:

 -  ASA class > III

 -  unstable coronary artery disease

 -  revision surgery, bilateral arthroplasty

 -  general anaesthesia

 -  decreased mental status