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KMID : 0356919920250040708
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Korean Journal of Anesthesiology
1992 Volume.25 No. 4 p.708 ~ p.718
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Clinical Investigation of Laryngeal Mask Airway
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Abstract
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Laryngeal mask airway(LAM) is a new type of airway. Which may be used as an alternative to either the endotracheal tube or the face-mask with either spontaneous or positive pressure ventilation without penetration of the larynx or esophagus. LMA
have
many advantages of easy intubation without laryngoscope and muscle relaxants. Decreasing damages of larynx and pharynx. And also useful in difficult intubation or emergency airway care. Recently its interestings has been increased.
Clinical studies of LMA was done in 242 patients, about hemodynamic changes. Volume and pressure changes of cuff, problems and complications during insertion and maintaining of LMA.
@ES The results were as follows
@EN 1) The average time taken to insert the laryngeal mask airway was 9.9 sec(range:5~60 sec). And 43 cases were correct placement at the second attempt. And the total insertion time was 103 min(range:15~355 min).
2) Total air volume of cuff was 20.5 ml(range:15~35 ml)in LMA No 3,28.1 ml(range: 25~60ml) in LMA No 4 The least volume of cuff without air leakage was 15 ml in LMA No 3 and 25 mi in LMA No 3. During positive pressure ventilation the peak airway
pressure was 20cmH o(15mmHg)
3) In hemodynamic changes blood pressure was increased about 27.5 mmHg in systolic. 21.2mmHg in diastolic, and 22.4 mmHg in mean arterial pressure after LMA insertion. Heart rate was increased about 37.7 beast min after LMA insertion.
4) Cuff pressure was increased from 70.5 mmHg at insertion to 98.9mmHg after 1 hours with use of N2O for anesthesia and more increased than without N2O.
5) LMA was used 220 patients in supine position and 5 patients in lateral position. In 8 cases was failed to insertion of LMA.
6) Complications were 3 cases of gastric distention. 1 cases of difficult nasogastric tube insertion, and 1 case of severe sore throat with mucosal bleeding on pharynx. Sore throat was complained 26.9% without regard to severity.
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