Comparative effects of Ringer's acetate and lactate solutions on intraoperative central and peripheral temperatures.
OBJECTIVE
To compare the effects of Ringer's lactate (LR) and Ringer's acetate (AR) solutions on core body and peripheral temperatures during isoflurane or sevoflurane anesthesia.


METHODS
Prospective, randomized study.


METHODS
Operating rooms of a university hospital.


METHODS
60 ASA physical status I and II patients undergoing general surgery.


METHODS
Following induction with 5 mg/kg of thiamylal and 0.1 mg/kg of vecuronium, patients were randomly assigned to one of four groups (15 patients per group). They received inhalation anesthetics (66% nitrous oxide [N2O] and 1.0% to 2.0% isoflurane or 1.3% to 2.6% sevoflurane) and LR or AR.


RESULTS
Tympanic membrane (central) temperatures, forearm temperatures, and fingertip temperatures were recorded during surgery every 30 minutes. Tympanic membrane temperatures in the patients given AR were significantly higher than those given LR during isoflurane anesthesia 5 and 30 minutes after induction of anesthesia. However, this was not the case for sevoflurane anesthesia. There were no significant differences in forearm and fingertip temperatures or fingertip bloodflow among the four groups.


CONCLUSIONS
There was no significant difference between AR and LR in the preservation of heat during either sevoflurane or isoflurane anesthesia. However, AR may be superior to LR for maintaining central temperature during the early period of isoflurane anesthesia.
Kashimoto
S
S
Department of Anesthesiology, Yamanashi Medical University, Japan.
Narumi
Y
Y
Matsukawa
T
T
Oguchi
T
T
Kumazawa
T
T
D000085:Acetates / Q000494:pharmacology*; D000368:Aged; D000769:Anesthesia, Inhalation; D018685:Anesthetics, Inhalation; D001831:Body Temperature / Q000187:drug effects*; D005260:Female; D005385:Fingers / Q000502:physiology; D005542:Forearm / Q000502:physiology; D006801:Humans; D007432:Intraoperative Period; D007530:Isoflurane; D007552:Isotonic Solutions / Q000494:pharmacology*; D007773:Lactates / Q000494:pharmacology*; D008297:Male; D008738:Methyl Ethers; D008875:Middle Aged; D000077331:Ringer's Solution; D000077149:Sevoflurane; D014432:Tympanic Membrane / Q000502:physiology
D000085:Acetates; D018685:Anesthetics, Inhalation; D007552:Isotonic Solutions; D007773:Lactates; D008738:Methyl Ethers; D000077149:Sevoflurane; D000077331:Ringer's Solution; D007530:Isoflurane