Une évaluation in vitro de l’intensité lumineuse fournie lors de la visualisation directe du larynx par les vidéolaryngoscopes munis de lames à géométrie Macintosh

Abstract

Background Adequate illumination of the larynx is needed during laryngoscopy to facilitate tracheal intubation. The International Organization for Standardization (ISO) has established a minimum light intensity for direct laryngoscopy (DL) of over 500 lux for at least ten minutes, but no such standard exists for Macintosh geometry videolaryngoscope (Mac-VL) blades, which allow for both direct or indirect (videoscopic) viewing of the larynx. Using in situ bench and in vitro testing in a human cadaver, we determined illumination and luminance values delivered by various Mac-VLs and compared these with published minimum lighting benchmarks as well as a reference direct laryngoscope. Methods We tested six Mac-VLs (i-view TM , McGRATH TM MAC, GlideScopeÒ Spectrum TM [single-use] DVM S4, GlideScopeÒ Titanium [reusable] Mac T4, C-MACÒ S [single-use] Macintosh #4, C-MACÒ [reusable] Macintosh #4) together with one direct laryngoscope (Heine LED). Each laryngoscope was assessed with three measurements,