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Thoracic epidural anesthesia increases tissue oxygenation during major abdominal surgery
Barbara Kabon1, Edith Fleischmann, Tanja Treschan
1*Department of Anesthesiology, Washington University, St. Louis, Missouri, †Department of Anesthesiology and General Intensive Care and ‡Anesthesiology and Intensive Care Medicine, Vienna General Hospital, University of Vienna, Austria; §Department of Anesthesiology, University of Berne, Switzerland; and ∥Outcomes Research Institute™, University of Louisville, Kentucky.
Supplemental thoracic epidural anesthesia during major abdominal surgery significantly improves tissue oxygenation. This anesthesia technique blunts surgical stress-induced vasoconstriction, enhancing subcutaneous oxygen tension and potentially reducing infection risk.
Area of Science:
- Anesthesiology
- Surgical Physiology
Background:
- Surgical stress increases adrenergic activity, leading to vasoconstriction and potential tissue hypoxia.
- Tissue hypoxia is linked to a higher incidence of surgical wound infections.
Purpose of the Study:
- To test if thoracic epidural anesthesia improves tissue perfusion and subcutaneous oxygen tension during major abdominal surgery.
- To evaluate the impact of combined general and epidural anesthesia on tissue oxygenation.
Main Methods:
- Thirty patients undergoing major abdominal surgery were randomized into two groups: general anesthesia (n=15) or combined general and epidural anesthesia (n=15).
- Subcutaneous tissue oxygen tension was continuously measured using a Clark type electrode.
- Standardized anesthesia techniques and fluid management were employed.
Main Results:
- Intraoperative tissue oxygen tension was significantly higher in the combined anesthesia group (54.3 ± 7.4 mm Hg) compared to the general anesthesia group (42.1 ± 8.6 mm Hg) after 60 minutes (P=0.0002).
- Subcutaneous tissue oxygen tension remained elevated in the combined anesthesia group throughout the observation period.
- Hemodynamic and global oxygen variables were comparable between the groups.
Conclusions:
- Thoracic epidural anesthesia effectively blunts the reduction in subcutaneous tissue oxygen tension caused by surgical stress and adrenergic vasoconstriction.
- Combined general and epidural anesthesia supports adequate tissue oxygenation during major abdominal surgery, potentially mitigating risks associated with hypoxia.