Supplementary oxygen and the laryngeal mask airway : Evaluation of a heat-and-moisture exchanger

Heat-and-moisture exchangers (HMEs) are routinely used in anaesthesia for the humidification and warming of inspired gases. The use of the Laryngeal Mask Airway (LMA) is widespread, and many anaesthetists choose to leave it in situ until the patient regains consciousness. In this study, we have inve...

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Veröffentlicht in:Anaesthesia and intensive care 1999-10, Vol.27 (5), p.509-511
Hauptverfasser: ORME, R. M. L, WILLIAMS, M
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WILLIAMS, M
description Heat-and-moisture exchangers (HMEs) are routinely used in anaesthesia for the humidification and warming of inspired gases. The use of the Laryngeal Mask Airway (LMA) is widespread, and many anaesthetists choose to leave it in situ until the patient regains consciousness. In this study, we have investigated the effectiveness of an HME as a means of administering supplemental oxygen via LMA in the immediate postoperative period. Oxygen was administered at varying flow rates via the gas sampling port of the HME and the oxygen delivery recorded, using end-tidal oxygraphy as a measure of alveolar PO2. At an oxygen flow rate of 4 l.min-1, the HME provided a mean end-tidal oxygen concentration of 36.2% (+/- 6.2), which compares favourably to other previously described devices. The HME thus represents a convenient, effective and economical means of oxygen supplementation via the LMA.
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source SAGE Complete A-Z List; MEDLINE; Alma/SFX Local Collection
subjects Adolescent
Adult
Aged
Aged, 80 and over
Anesthesia
Anesthesia Recovery Period
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Anesthesia: equipment, devices
Biological and medical sciences
Female
Humans
Humidity
Laryngeal Masks
Male
Medical sciences
Middle Aged
Oxygen Inhalation Therapy - instrumentation
Oxygen Inhalation Therapy - methods
Temperature
title Supplementary oxygen and the laryngeal mask airway : Evaluation of a heat-and-moisture exchanger
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