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Intraoperative hypothermia associated with lower extremity tourniquet deflation
B J Sanders1, J G D'Alessio, J R Jernigan
1Department of Anesthesiology, University of Tennessee Medical Center, Memphis 38103-2897, USA.
Journal of Clinical Anesthesia
|September 1, 1996
Summary
Core body temperature significantly drops after releasing a lower extremity tourniquet due to reperfusion of the cool limb. Continuous temperature monitoring is recommended during surgery.
Area of Science:
- Anesthesiology
- Trauma Surgery
- Physiology
Background:
- Tourniquet use in lower extremity surgery can lead to significant physiological changes.
- Understanding core temperature fluctuations is crucial for patient safety during anesthesia.
Purpose of the Study:
- To quantify the rate and magnitude of core temperature decrease after tourniquet release.
- To assess the clinical implications of temperature changes in patients undergoing lower extremity surgery.
Main Methods:
- Prospective study involving 11 adult patients undergoing lower extremity fracture fixation with tourniquet use under general anesthesia.
- Esophageal temperature was monitored before and at 5 and 10 minutes after tourniquet deflation.
- Tourniquet application times ranged from 41 to 129 minutes.
Main Results:
- All patients experienced a decrease in core temperature post-tourniquet release.
- Average esophageal temperature decreased by 0.46°C at 5 minutes and 0.67°C at 10 minutes (p=0.0001).
- The maximal temperature decline was observed at 10 minutes post-release.
Conclusions:
- Significant and rapid core temperature drop occurs immediately after lower extremity tourniquet release.
- This phenomenon is attributed to the reperfusion of a cooled limb and mixing of blood.
- Recommend core temperature monitoring and vigilant postoperative care in patients undergoing lower extremity tourniquet procedures.