• Yasutomo Tanaka, Yukiko Miyazaki, Hidenori Kitakata, Hiromi Shibuya, and Toshiki Okada.
• Masui. 2015 Dec 1; 64 (12): 1286-90.

BackgroundStudies show that McGRATH® MAC (McG) is useful during direct laryngoscopy. However, no study has examined whether McG re- duces pressure on the upper airway tract We compared direct vision with indirect vision concerning pressure on the larynx and tongue.MethodsTwenty two anesthesiologists and 16 junior residents attempted direct laryngoscopy of airway management simulator using McG with direct vision and indirect vision. Pressure was measured using pressure measurement film.ResultsIn anesthesiologists group, pressure on larynx was 14.8 ± 2.7 kgf · cm(-2) with direct vision and 12.7 ± 2.7 kgf · cm(-2) with indirect vision (P < 0.05). Pressure on the tongue was 8.8 ± 3.2 kgf cm(-2) with direct vision and 7.6 ± 2.8 kgf · cm(-2) with indirect vision (P = 0.18). In junior residents group, pressure on larynx was 19.0 ± 1.3 kgf · cm(-2) with direct vision and 14.1 ± 3.1 kgf · cm(-2) with indirect vision (P < 0.05). Pressure on the tongue was 15.4 ± 3.6 kgf · cm(-2) with direct vision and 11.2 ± 4.7 kgf · cm(-2) with indirect vision (P < 0.05).ConclusionsMcG with indirect vision can reduce pressure on the upper airway tract.

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