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Thermal effects of monopolar electrosurgery detected by real-time infrared thermography: an experimental appendectomy study
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Thermal effects of monopolar electrosurgery detected by real-time infrared thermography: an experimental appendectomy study
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Journal Article
Thermal effects of monopolar electrosurgery detected by real-time infrared thermography: an experimental appendectomy study
2020
Overview
Background
Monopolar energy (ME) is routinely used in appendectomy. This study aimed to investigate the degree of lateral thermal spread generated by ME and to evaluate the thermal injury sustained by the close-lying tissues.
Methods
Appendectomy with a monopolar Maryland dissector was performed in 8 rabbits (at 30 and 60 W power settings). A high-resolution infrared camera was used to record tissue heating during the intervention. After autopsy macroscopic changes were evaluated and tissue samples were subjected to myeloperoxidase (MPO) assay and histological examination.
Results
No significant differences in the extent of thermal spread, MPO activity and histological signs of inflammation were observed between groups. Regardless of the power settings, the heat spread exceeded 2 cm laterally along the mesoappendix when application time exceeded 3 s. The spread of heat through tubular structures in both groups caused a significant temperature rise in the nearby intestinal loop, resulting in perforation (
n
= 3) and necrosis (
n
= 1).
Conclusions
Application time is critical in thermal spread during appendectomy aided by ME. Tubular anatomic structures can enhance thermal injury on distant tissues. The observed effects of ME bear clinical relevance that need further investigation.
