Document Detail

The Callander laryngoscope blade modification is associated with a decreased risk of dental contact.
MedLine Citation:
PMID:  14766698     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Dental damage may occur with laryngoscopy. The purpose of this study was twofold: to determine whether preoperative examination could predict the risk of contacting the teeth with the laryngoscope and to evaluate the effectiveness of a modified Macintosh blade on reducing dental contact. METHODS: Four hundred and eighty-three patients scheduled for elective surgery requiring general anesthesia with endotracheal tube placement were studied prospectively. Features that might predict difficult intubation were assessed preoperatively. Laryngoscopy was performed twice on each patient, once with a regular Macintosh 3 blade and once with a blade in which the flange was partially removed (Callander modification). The distance between the flange of the blade and the upper incisors at glottic exposure was measured. We calculated correlations between individual airway characteristics and the chance of hitting the upper teeth with the regular Macintosh 3 blade and compared the frequencies of contacting the teeth between the two blades. RESULTS: The chance of hitting the upper teeth when using the regular Macintosh 3 blade increased significantly with non-parametric scores for Mallampati classification, mandibular subluxation, head and neck movement, interincisor gap, and condition of the upper teeth. (P < 0.01) The frequency of direct contact varied significantly between the two blades: 20.3% vs 4.1% for Macintosh 3 and modified blades, respectively (P < 0.05). Laryngeal views were improved with the modified blade. CONCLUSION: Airway characteristics correlate with the risk of hitting the upper teeth during laryngoscopy. The modified Macintosh blade reduces the risk of contacting the teeth.
Jaemin Lee; Jong H Choi; Yoon K Lee; Eun S Kim; Ou K Kwon; Randolph H Hastings
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of anaesthesia = Journal canadien d'anesthésie     Volume:  51     ISSN:  0832-610X     ISO Abbreviation:  Can J Anaesth     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-02-09     Completed Date:  2004-08-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8701709     Medline TA:  Can J Anaesth     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  181-4     Citation Subset:  IM    
Department of Anesthesiology, School of Medicine, The Catholic University of Korea, Seoul, Korea.
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MeSH Terms
Anesthesia, General
Chi-Square Distribution
Equipment Design
Intubation, Intratracheal / instrumentation,  methods
Laryngoscopes / adverse effects*,  standards*
Prospective Studies
Risk Factors
Statistics, Nonparametric
Tooth Injuries / etiology*,  prevention & control*

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

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