British Journal of Anaesthesia, Vol 80, Issue 5 677-679, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
C. Verghese, J. Berlet, A. Kapila and R. Pollard
We conducted a clinical comparison of the laryngeal mask airway (LMA) and
the new single use PVC LMA (LMA-Unique) in 100 fasted adult patients
undergoing elective surgery. Patients were allocated to one of two groups:
group 1 (n = 50) was managed by two consultants and group 2 by two trainee
anaesthetists. Airway management was randomized prospectively within each
group, and cuff pressure in both devices was maintained at a maximum of 50
mm Hg with upward size substitution if leaks persisted during intermittent
positive pressure ventilation (IPPV). Insertion with the recommended
technique was successful in all patients (85 first attempt). One patient
(group 1) required four attempts for insertion of the LMA-Unique and in one
patient (group 2) the LMA-Unique was replaced by a tracheal tube because of
persistent leaks during IPPV. In 99 patients IPPV was uneventful. The
adjusted mean volume of air for cuff inflation in the LMA-Unique was
significantly less in group 1 (P = 0.0013). At fibreoptic laryngoscopic
examination, the vocal cords or arytenoids, or both, could be seen in 92%
of patients in group 1 and in 90% of patients in group 2. Immediate throat
soreness was reported in four patients in group 1 and in seven in group 2.
The results suggest that the LMA-Unique was similar in clinical performance
to the LMA.
SHORT COMMUNICATIONS
Clinical assessment of the single use laryngeal mask airway--the LMA- unique
Research Centre, Department of Anaesthesia, Royal Berkshire Hospital, Reading RG1 5AN.
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