HEAT CONSERVATION VS CONVECTIVE WARMING IN ADULTS UNDERGOING ELECTIVESURGERY

Citation
N. Patel et al., HEAT CONSERVATION VS CONVECTIVE WARMING IN ADULTS UNDERGOING ELECTIVESURGERY, Canadian journal of anaesthesia, 44(6), 1997, pp. 669-673
Citations number
20
Categorie Soggetti
Anesthesiology
ISSN journal
0832610X
Volume
44
Issue
6
Year of publication
1997
Pages
669 - 673
Database
ISI
SICI code
0832-610X(1997)44:6<669:HCVCWI>2.0.ZU;2-V
Abstract
Purpose: To determine the relative efficacy of heat conservation and c onvective warming in maintaining perioperative normothermia, (central temperature greater than or equal to 36 degrees C). Methods: Thirty-se ven patients undergoing elective gynaecological, orthopaedic, or gener al surgery scheduled to last two hours were prospectively studied. Pat ients were randomized to one of two groups. Group I patients received heat conservation with reflective blankets (Thermadrape(TM), Vital Sig ns, Inc., Totowa, NJ) applied preoperatively and warmed iv fluids (Hot line(TM) SIMS level I Technologies, Inc, Rockland, MA). Group 2 patien ts received convective warming (BairHugger, Augustine Medical, Inc., E den Prairie, MN) after induction of anaesthesia and iv fluids at room temperature. All patients received general anaesthesia with isoflurane . Tympanic membrane and forearm-fingertip skin temperature gradients w ere measured perioperatively at 15 min intervals. Results: Central tem perature decreased after induction to a minimum level of 35.9 +/- 0.1 degrees C in group I and 36.0 +/- 0.1 degrees C in group 2 and then in creased towards pre-induction values in group 2, and were higher (P < 0.05) than in group 1:95% group 2 patients had central temperature gre ater than or equal to 36.0 degrees C at the end of surgery (vs 69% of group I, P < 0.05), During the first 30 min in PACU, central temperatu res were higher in group I than in group 2 (36.8 +/- 0.1 degrees C vs 36.2 +/- 0.2 degrees C, P < 0.05). After 60 min, central temperatures were similar (36.8 degrees C). The incidence of shivering and degree o f peripheral cutaneous vasoconstriction were also similar. Conclusion: Patients receiving convective warming were more likely to leave the o perating room normothermic, and had higher central temperatures during the first 30 min in the recovery room. The intergroup temperature dif ferences were small, and by 60 min, had disappeared.