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British Journal of Anaesthesia, 2000, Vol. 84, No. 5 650-654
© 2000 The Board of Management and Trustees of the British Journal of Anaesthesia

Equipment

The LMA ‘ProSeal’—a laryngeal mask with an oesophageal vent

A. I. J. Brain1, C. Verghese1 and P. J. Strube2

1 Department of Anaesthesia, Royal Berkshire Hospital, Reading, Berkshire RG1 5AN
2 Department of Anaesthesia, Wycombe General Hospital, Queen Alexandra Road, High Wycombe, Buckinghamshire HP1 2TT, UK

A. I. J. Brain, 1, Princes Street, Reading RG1 4EG, UK

Abstract

We describe a new laryngeal mask airway (LMA) that incorporates a second tube placed lateral to the airway tube and ending at the tip of the mask. The second tube is intended to separate the alimentary and respiratory tracts. It should permit access to or escape of fluids from the stomach and reduce the risks of gastric insufflation and pulmonary aspiration. It can also determine the correct positioning of the mask. A second posterior cuff is fitted to improve the seal. A preliminary crossover comparison with the standard mask in 30 adult female patients showed no differences in insertion, trauma or quality of airway. At 60 cm H2O intracuff pressure, the new LMA gave twice the seal pressure of the standard device (P<0.0001) and permitted blind insertion of a gastric tube in all cases. It is concluded that the new device merits further study.


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