[Comparative study of inhalation induction by vital capacity breath in adults using 6% sevoflurane with oxygen or 4.5%sevoflurane in 50% nitrous oxide].
OBJECTIVE
To evaluate the efficacy, side effects and hemodynamic characteristics of induction by vital capacity breath in adults using 6% sevoflurane and oxygen versus 4.5% sevoflurane and 50% nitrous oxide.


METHODS
We assigned 50 ASA I-II patients aged 20 to 70 years old randomly to two groups of 25 to receive either 6% sevoflurane in oxygen or 4.5% sevoflurane in nitrous oxide. All patients were premedicated with oral bromazepam (1.5 to 3 mg). Induction was by vital capacity breath using a Mapleson A circuit (8 l. min-1) for 5 min. We recorded induction time, side effects, hemodynamic variables and patient opinion after surgery.


RESULTS
Induction time was significantly faster for the sevoflurane-oxygen group (60 +/- 10 s) than for the sevoflurane-nitrous oxide group (71 +/- 8 s) (p < 0.001). Complications were minor and hemodynamic variables stable in both groups, with no statistically significant differences. The patients expressed satisfaction with both induction techniques.


CONCLUSIONS
A vital capacity breath of 6% sevoflurane provided rapid induction. Induction was no more rapid when 50% nitrous oxide was added and the incidence of side effects did not decrease. Hemodynamic variables are stable during induction with sevoflurane with or without nitrous oxide, making this a well-tolerated alternative technique that is positively evaluated by patients.
Calderón
E
E
Servicio de Anestesiología-Reanimación y Terapéutica del Dolor, Hospital Universitario Puerta del Mar, Cádiz.
Torres
L M
LM
Calderón-Pla
E
E
D000328:Adult; D000367:Age Factors; D000368:Aged; D000769:Anesthesia, Inhalation / Q000379:methods*; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D005260:Female; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D008297:Male; D008738:Methyl Ethers / Q000494:pharmacology*; D008875:Middle Aged; D009609:Nitrous Oxide / Q000494:pharmacology*; D010100:Oxygen / Q000494:pharmacology; D000077149:Sevoflurane; D014797:Vital Capacity / Q000187:drug effects
D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D000077149:Sevoflurane; D009609:Nitrous Oxide; D010100:Oxygen