Journal Article

Positive pressure ventilation during fibreoptic intubation: comparison of the laryngeal mask airway, intubating laryngeal mask and endoscopy mask techniques

K. Aoyama, E. Yasunaga, I. Takenaka, T. Kadoya, T. Sata and A. Shigematsu

in BJA: British Journal of Anaesthesia

Published on behalf of the British Journal of Anaesthesia

Volume 88, issue 2, pages 246-254
Published in print February 2002 | ISSN: 0007-0912
Published online February 2002 | e-ISSN: 1471-6771 | DOI: https://dx.doi.org/10.1093/bja/88.2.246
Positive pressure ventilation during fibreoptic intubation: comparison of the laryngeal mask airway, intubating laryngeal mask and endoscopy mask techniques

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Background. The efficacy of delivery of mechanical ventilation through different airway devices during fibreoptic intubation is not known.

Methods. We compared the laryngeal mask airway (LMA), intubating laryngeal mask (ILM) and endoscopy mask for positive pressure ventilation (PPV) during fibreoptic intubation. In 80 adult paralysed patients, fibreoptic intubation was performed during PPV using a combination of a size 3 or 4 LMA with a 6.0 mm nasal RAE tracheal tube (LMA3/4 group; n=22), a size 5 LMA with a 7.0 mm nasal RAE tube (LMA5 group; n=18), an ILM with an 8.0 mm special reinforced tracheal tube (ILM group; n=20) or an endoscopy mask (Patil mask) with a 7.5 mm standard tracheal tube (Patil group; n=20). The inspiratory and expiratory tidal volumes (Vi and Ve) with a ventilation pressure of 20 cm H2O were measured using a pneumotachograph.

Results. Mean Ve values during fibreoptic intubation in the LMA5 [5.3 (sd 1.5) ml kg–1] and ILM [7.1 (2.3) ml kg–1] groups were greater than in the LMA3/4 group [2.6 (1.0) ml kg–1, P<0.0001]. The mean Ve was greater in the Patil group [20.6 (4.9) ml kg–1] than in the other three groups (P<0.0001). Gastric insufflation during intubation was more frequent in the Patil group (30%) than in the other three groups (4.5–5.6%) (P<0.05).

Conclusion. PPV is possible with the LMA, ILM or endoscopy mask during fibreoptic intubation. With an airway pressure of 20 cm H2O, ventilation during intubation using a size 3 or 4 LMA was almost insufficient, while ventilation using a size 5 LMA or an ILM was almost acceptable. Ventilation during intubation with the endoscopy mask was greater than that with the LMA or ILM, but gastric insufflation was more frequent.

Br J Anaesth 2002; 88: 246–54

Keywords: Keywords: airway, management; equipment, masks anaesthesia; anaesthetic techniques, fibreoptic bronchoscopy; intubation, tracheal; ventilation, mechanical

Journal Article.  5834 words.  Illustrated.

Subjects: Anaesthetics

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