Decreased Fresh Gas Flow Cannot Compensate for an Increased Operating Room Temperature in Maintaining Body Temperature During Donor Hepatectomy for Living Liver Donor Hepatectomy

Background. The purpose of this study was to compare the effect of various combinations of fresh gas flow (FGF) of anesthesia and different ambient operation room temperatures (ORT) on changes in nasopharyngeal temperature (NT) among living donors undergoing partial hepatectomy. Methods. The anesthesia records of 167 patients were reviewed retrospectively. The patients were allocated into 4 groups: GI (n = 37): isoflurane in 2 L FGF and at typical ambient ORT (19 degrees C-21 degrees C); GII (n = 11) isoflurane in 1 L FGF and 1 L air at typical ORT; GIII (n = 31) isoflurane in 0.5 L FGF at typical ORT; and GIV (n = 88) isoflurane in 0.5 L FGF at ORT of 24 degrees C. The changes in NT were compared using a two-way repeated measure analysis of variance (ANOVA) followed by Bonferroni post hoc tests. Results. Changes of NTs of GIV were significantly higher compared with the other 3 groups, whereas the changes of NTs were the same among GI, GII, and GIII. Conclusion. FGF of different volumes seemed to have no significant effect on intraoperative changes of NT in regular ORT. Low-flow anesthesia combined with ORT of 24 degrees C provided significantly higher NTs at all measured points compared with GI, GII, and GIII.