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J Clin Anesth. 1998 Aug;10(5):380-5.

Preventing hypothermia: convective and intravenous fluid warming versus convective warming alone.

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1
Department of Anesthesiology, MetroHealth Medical Center, Case Western Reserve University, Cleveland, OH 44109, USA.

Abstract

STUDY OBJECTIVE:

To test the hypothesis that warming intravenous (i.v.) fluids in conjunction with convective warming results in less intraoperative hypothermia (core temperature < 36.0 degrees C) than that seen with convective warming alone.

DESIGN:

Prospective, randomized study.

SETTING:

University affiliated tertiary care teaching hospital.

PATIENTS:

61 ASA physical status, I, II, and III adults undergoing major surgery and general anesthesia with isoflurane.

INTERVENTIONS:

All patients received convective warming. Group 1 patients received warmed fluids (setpoint 42 degrees C). Group 2 patients received room temperature fluids (approximately 21 degrees C).

MEASUREMENTS AND MAIN RESULTS:

Lowest and final intraoperative distal esophageal temperatures were higher (p < 0.05) in Group 1 (mean +/- SEM: 35.8 +/- 0.1 degrees C and 36.6 +/- 0.1 degrees C) versus Group 2 (35.4 +/- 0.1 degrees C and 36.1 +/- 0.1 degrees C, respectively). Compared with Group 1, more Group 2 patients were hypothermic at the end of anesthesia (10 of 26 patients, or 38.5% vs. 4 of 30 patients, or 13%; p < 0.05). After 30 minutes in the recovery room, there were no differences in temperature between groups (36.7 +/- 0.1 degrees C and 36.5 +/- 0.1 degrees C in Groups 1 and 2, respectively). Intraoperative cessation of convective warming because of core temperature greater than 37 degrees C was required in 33% of Group 1 patients (vs. 11.5% in Group 2; p = 0.052).

CONCLUSIONS:

The combination of convective and fluid warming was associated with a decreased likelihood of patients leaving the operating room hypothermic. However, average final temperatures were greater than 36 degrees C in both groups, and intergroup differences were small. Care must be taken to avoid overheating the patient when both warming modalities are employed together.

PMID:
9702617
[Indexed for MEDLINE]
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