[Incidence of postoperative shivering in relation to the time of sevoflurane discontinuation].
OBJECTIVE
We aimed to determine whether early termination of sevoflurane administration lowers the incidence of postanesthetic shivering.


METHODS
Eighty ASA I-III patients were randomized to two groups of 40 (Group A and Group B). All were premedicated with oral bromazepam. Fentanyl (2 micrograms/Kg), propofol (2.5 mg/Kg) and atracurium (0.5 mg/Kg) were used for induction. Anesthesia was maintained with sevoflurane in 60% N2O in oxygen at 1 maximum alveolar concentration, with boluses of fentanyl and atracurium on demand. Sevoflurane administration was terminated 30 minutes before awakening in group A and 10 minutes before awakening in group B. After termination, 60% N2O in oxygen was used in both groups. Mean blood pressure, heart rate and peripheral and core temperatures were measured at 5 minutes intervals during surgery. Postoperative shivering was recorded until one hour after awakening.


RESULTS
Patient characteristics and duration of anesthesia were similar in both groups. The incidence of shivering was significantly lower in group A (4%) than in group B (57%). No significant differences were observed in other variables.


CONCLUSIONS
The important observation in this study was that the incidence of postoperative shivering in group A was lower than in group B and lower than the incidences reported in other similar studies.
Mato
M
M
Servicio de Anestesia, Reanimación y Tratamiento del Dolor, Hospital Universitario Puerta del Mar, Cádiz.
Pérez
A
A
Otero
J
J
De Antonio
P
P
Márquez
C
C
Torres
L M
LM
D000328:Adult; D018685:Anesthetics, Inhalation / Q000008:administration & dosage / Q000009:adverse effects*; D001833:Body Temperature Regulation / Q000187:drug effects / Q000502:physiology; D023341:Chills / Q000139:chemically induced / Q000453:epidemiology / Q000517:prevention & control*; D005260:Female; D006706:Homeostasis; D006801:Humans; D007031:Hypothalamus / Q000187:drug effects / Q000502:physiology; D015994:Incidence; D008297:Male; D008738:Methyl Ethers / Q000008:administration & dosage / Q000009:adverse effects*; D008875:Middle Aged; D011183:Postoperative Complications / Q000139:chemically induced / Q000453:epidemiology / Q000517:prevention & control*; D000077149:Sevoflurane; D012768:Shivering / Q000187:drug effects* / Q000502:physiology; D013997:Time Factors
D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D000077149:Sevoflurane