Document Detail

Effect of laryngeal mask airway on esophageal motility during general anesthesia.
MedLine Citation:
PMID:  12477587     Owner:  NLM     Status:  MEDLINE    
STUDY OBJECTIVES: To determine whether the Laryngeal Mask Airway (LMA) triggers the pharyngo-esophago-gastric reflex during general anesthesia by comparing the esophageal motility of patients with the LMA and endotracheal tube (ETT) in place. DESIGN: Randomized clinical trial. SETTING: Operating room and recovery room of a tertiary-care referral hospital. PATIENTS: 50 adult ASA physical status I and II patients scheduled for elective orthopedic surgery. INTERVENTIONS: All patients received a standardized general anesthetic technique, then were allocated randomly to the LMA (n = 30) or ETT (n = 20) groups. MEASUREMENTS AND MAIN RESULTS: The esophageal manometric inputs were recorded continuously using an ambulatory esophageal manometric recorder and divided into five perioperative phases (preanesthesia, induction, surgery, LMA, or ETT rejection and arousal phase). The LMA or ETT was removed at the end of the surgery, when the patient was awake. An awake state was defined as the presence of the following clinical signs: swallowing, bucking, struggling, straining, and restlessness. The esophageal peristaltic wave percent and esophageal contraction frequency were significantly decreased during induction, surgery, and the LMA or ETT rejection and arousal phases compared with the preanesthetic phases in both the LMA and ETT groups. However, there were no significant group differences in any corresponding perioperative phases. CONCLUSION: During the general anesthetic period before the arousal phase in this study, a LMA does not provoke significantly different esophageal peristalsis compared with an ETT. Thus, the LMA is unlikely to stimulate the pharyngo-esophago-gastric reflex during that period.
Yong Son; Soo-Kyung Park; Young-Pyo Cheong; Yoo-Sun Choi; Jin-Young Ahn; Young-Hoon Kim; Suck-Chei Choi; Kyung-Kun Lee
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of clinical anesthesia     Volume:  14     ISSN:  0952-8180     ISO Abbreviation:  J Clin Anesth     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-12-12     Completed Date:  2003-09-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8812166     Medline TA:  J Clin Anesth     Country:  United States    
Other Details:
Languages:  eng     Pagination:  518-23     Citation Subset:  IM    
Copyright Information:
Copyright 2002 by Elsevier Science Inc.
Department of Anesthesiology, Wonkwang University School of Medicine, Iksan City, Cheonbuk, South Korea.
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MeSH Terms
Anesthesia, General*
Esophageal Motility Disorders / etiology*
Intubation, Intratracheal / adverse effects*
Laryngeal Masks / adverse effects*
Orthopedic Procedures
Prospective Studies
Surgical Procedures, Elective

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