Document Detail

Study of the adjustment of the Ambu laryngeal mask under magnetic resonance imaging.
MedLine Citation:
PMID:  17986037     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Our aim in this study was to analyze the adjustment of the laryngeal mask, Ambu AuraOnce, in pediatric patients during magnetic resonance imaging (MRI) and to look for a correlation between clinical parameters such as the sealing pressure and the ease of introduction with radiological parameters. METHODS: One-hundred and twenty-one pediatric patients from 4 months to 17 years who required a cranial MRI for other reasons were enrolled in the study. General anesthesia was induced with sevofluorane and no relaxant was used. Insertion attempts, sealing pressure, desaturation episodes and maintenance of anesthesia were recorded. Spontaneous ventilation was maintained throughout all procedures and no episodes of desaturation below 95% were seen. Patients without cough or pharyngeal pain were discharged after 1 h. Data were classified into three groups according to the size of the used laryngeal mask (group 1 for laryngeal mask number 1(1/2); group 2 for laryngeal mask number 2, and group 3 for laryngeal mask number 2(1/2)). Sagittal MRI cuts were reviewed to calculate neck flexion, laryngeal mask position and its relationship with the trachea. RESULTS: First-attempt introduction rate of the laryngeal mask was 96%, and it was 100% after a second attempt. Sealing pressure was 22.1+/-4.15 mmHg for group 1, 22.23+/-3.94 for group 2, and 23.83+/-3.28 for group 3. The angles between the laryngeal mask and the four first cervical vertebrae were calculated (group 1, 33.65+/-8.05; group 2, 28.09+/-6.65; group 3, 25.79+/-4.26). Distances between trachea and proximal and distal cuffs were measured to evaluate proper fitting of the laryngeal mask. Anomalous placement seen on MRI, using distances from proximal and distal cuff to trachea, occurred in 23.5% in group 1, 10.9% in group 2, and 13.8% in group 3. We found no correlation between this anomalous position of the laryngeal mask and sealing pressure or ease of introduction. CONCLUSIONS: The Ambu AuraOnce can be regarded as a safe product for airway maintenance in pediatric patients. No relationship was found between radiological measurements and sealing pressures.
Enric Monclus; Antonio Garcés; Belen De Jose Maria; David Artés; Maged Mabrock
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Paediatric anaesthesia     Volume:  17     ISSN:  1155-5645     ISO Abbreviation:  Paediatr Anaesth     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-11-07     Completed Date:  2008-01-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206575     Medline TA:  Paediatr Anaesth     Country:  France    
Other Details:
Languages:  eng     Pagination:  1182-6     Citation Subset:  IM    
Pediatric Anesthesiology Unit, Hospital Sant Joan de deu, Barcelona, Spain.
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MeSH Terms
Anesthesia, General*
Anesthesiology / methods*
Anesthetics, Inhalation*
Child, Preschool
Laryngeal Masks*
Magnetic Resonance Imaging*
Methyl Ethers*
Reg. No./Substance:
0/Anesthetics, Inhalation; 0/Methyl Ethers; 28523-86-6/sevoflurane

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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