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Anesth Analg 2002;94:1416-1420
© 2002 International Anesthesia Research Society

CARDIOVASCULAR ANESTHESIA

An Increase in Body Temperature During Radiofrequency Ablation of Liver Tumors

Maiko Sawada, MD, Seiji Watanabe, MD, Hideaki Tsuda, MD, and Tatsuhiko Kano, MD

Department of Anesthesiology, Kurume University School of Medicine, Fukuoka, Japan

Address correspondence and reprint requests to Maiko Sawada, MD, Department of Anesthesiology, Kurume University School of Medicine, Asahimachi 67, Kurume, Fukuoka 830-0011, Japan. Address e-mail to mmss416{at}hotmail.com

Radiofrequency ablation (RFA) therapy using an active needle electrode inserted into liver tumors has been used clinically. To avoid hyperthermia, we investigated the relationship between the total output energy of the applied radiofrequency wave and changes in body temperature (BT) in patients receiving RFA. Fifteen patients undergoing RFA of liver tumors with general anesthesia were enrolled. The total output energy of radiofrequency waves was calculated from the power and duration of RFA. Changes in rectal (Trect) and tympanic temperatures were measured throughout the study. The mean number of liver tumors per patient was 1.7 ± 1.3. The mean RFA time was 30.0 ± 26.3 min. The mean total output energy was 125,935 ± 114,506 J. The mean value of Trect increased from 36.3°C ± 0.5°C to 37.0°C ± 1.0°C (P < 0.01). A linear correlation was obtained between the total output energy and the changes in Trect, indicating that Trect increased approximately by 1°C for every 3000 J/kg of total output energy. The increase in BT during RFA of liver tumors under general anesthesia is predictable. Close observation of total output energy delivered and BT are required, and preparation of cooling measures is important, in RFA of liver tumors.

IMPLICATIONS: The increase in body temperature (BT) is predictable during radiofrequency ablation (RFA) of liver tumors under general anesthesia. Close observation of total output energy delivered and BT are required, and preparation of cooling measures is important, in RFA of liver tumors.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 2002 by the International Anesthesia Research Society.