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MINERVA ANESTESIOLOGICA

A Journal on Anesthesiology, Resuscitation, Analgesia and Intensive Care


Official Journal of the Italian Society of Anesthesiology, Analgesia, Resuscitation and Intensive Care
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Minerva Anestesiologica 2017 August;83(8):798-803

DOI: 10.23736/S0375-9393.17.11537-3

Copyright © 2017 EDIZIONI MINERVA MEDICA

language: English

Retromolar laryngoscopy: a randomized crossover vocal cords visualization study

Christian REITERER , Barbara WALTL, Barbara KABON, Wolfgang SCHRAMM

Department of Anesthesia, General Intensive Care and Pain Management, Medical University of Vienna, Vienna General Hospital, Vienna, Austria


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BACKGROUND: Vocal cords visualization is a major determinant for successful tracheal intubation. The aim of our study was to compare vocal cord visualization by using conventional direct laryngoscopy with retromolar direct laryngoscopy in patients with an existing retromolar gap at the right mandible.
METHODS: We enrolled 100 adults needing endotracheal intubation for elective surgery. In each patient, the vocal cords were visualized and scored according to Cormack and Lehane with a Macintosh blade #3 for conventional technique and with a Miller blade #4 for the retromolar technique in a randomized sequence. Finally, tracheal intubation was performed primarily by conventional laryngoscopy and in the case of failing retromolar laryngoscopy was used as the rescue method.
RESULTS: Overall 100 laryngoscopies with the conventional method and 100 laryngoscopies with the retromolar method were scored according to Cormack and Lehane. The retromolar technique achieved significant (P=0.000003) lower Cormack and Lehane scores compared to the conventional technique. In eleven patients, intubation by conventional laryngoscopy failed and seven of those patients were successfully intubated by the retromolar technique. A BURP-maneuver significantly improved vocal cord visualization during both methods.
CONCLUSIONS: In summary, laryngoscopy via the retromolar method by using a Miller blade #4 lead to a significantly better vocal cord visualization compared to the conventional method performed with a Macintosh blade #3 in patients with an existing retromolar gap on the right side.


KEY WORDS: Airway management - Laryngoscopy - Video-assisted surgery

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Publication History

Issue published online: July 17, 2017
Article first published online: January 17, 2017
Manuscript accepted: January 9, 2017
Manuscript revised: January 4, 2017
Manuscript received: July 5, 2016

Cite this article as

Reiterer C, Waltl B, Kabon B, Schramm W. Retromolar laryngoscopy: a randomized crossover vocal cords visualization study. Minerva Anestesiol 2017;83:798-803. DOI: 10.23736/S0375-9393.17.11537-3

Corresponding author e-mail

christian.reiterer@meduniwien.ac.at