Bokser B, Fernández-Cerrotti H

Language: Spanish
References: 14
Page: 40-42
PDF size: 53.07 Kb.

ABSTRACT

Objective:To compare the capability of laryngeal mask, Combitube and endotracheal tube to avoid gastric reflux by measuring endotracheal pH. Methods: We tested forty-five patients under general anesthesia for elective surgery, ASA I and II, older than 18 years, with spontaneous breathing and on supine position. The patients were randomly allocated to three groups: laryngeal mask (n = 15), Combitube (n = 15) and endotracheal tube (n = 15). All patients were premedicated with midazolam 0.1 mg/kg and fentanyl 1-2 g/kg. Then, they were induced with penthotal sodium 4-6 mg/kg and succinilcolyne 1 mg/kg being precurarized with pancuronium 0.8 mg/kg. For maintenance isofluorane 2-2.5% and fentanyl 2-3 g/kg were used; no other muscle relaxant was used. Using a probe, a sample of endotracheal secretion was obtained thirty minutes after the surgery began. A reactive strip was used to measure pH (Spezialindikator pH 2.0-9.0 Merck). Results: In the group of patients with laryngeal mask, the mean pH was 6.57 (sd ± 0.65), in the group with Combitube, pH was 8.33 (sd ± 0.24) and in the group with endotracheal tube it was 8.33 (sd ± 0.75). Conclusions: Combitube and the endotracheal tube have been demonstrated to be effective to avoiding gastric reflux, while the laryngeal mask is less effective.

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