Accuracy of a smartphone to test laryngoscope's light and an audit to our laryngoscopes using an ISO standard

Machado, Diogo Alcino de Abreu Ribeiro Carvalho; Esteves, Dina da Assunção Azevedo; Branca, Pedro Manuel Araújo de Sousa

doi:10.1016/j.bjane.2016.07.007

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…The mobile phone app was not found to be accurate when compared to a lux meter. This is in keeping with a previous comparison of various free apps to a lux meter, 15 but is in contrast to the study by Machado et al 6 The author specified that the app used would have an accuracy of 80% in the range of 5 -10 000 lux, but it is not mentioned which app was used, if the app was purchased, and if any other accessories were required to ensure accuracy.…”

Section: Discussionsupporting

confidence: 54%

“…Their findings showed that the lux meter app readings were variable, and were not consistent with those taken by the lux meter. 15 In contrast, a study by Machado et al 6 measuring illuminance of laryngoscopes using an app and a lux meter showed that the app was as accurate as a lux meter. The authors describe the type of phone used in the study (Motorola ® Moto G XT1068), but not the android app chosen, or if any other accessories were required.…”

Section: Foundmentioning

confidence: 97%

“…Studies previously conducted have shown that the light produced may be of varying intensity and that the laryngoscopes functionality may not always be reliable. [3][4][5][6][7][8] The two most common lighting mechanisms of laryngoscopes are the "bulb-on-blade" or incandescent type, and the "bulbin-handle" or fibreoptic type. The light source or bulb of an incandescent laryngoscope is mounted on the blade of the laryngoscope.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The illuminance of laryngoscopes at two central hospitals

Davies

Perrie

Scribante

et al. 2019

South Afr J Anaesth Analg

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Background: Direct laryngoscopy and successful endotracheal intubation require optimal illumination of laryngeal structures. The International Organization of Standardization (ISO) describes minimum adequate laryngoscope illuminance as 500 lux after 10 minutes, and further describes optimal dimensions of the illumination field. Laryngoscope light is subjectively assessed by the anaesthetist as part of theatre preparation. This study sought to describe the illumination of laryngoscopes at two academic hospitals, to compare illumination of incandescent and fibreoptic laryngoscopes and to compare the accuracy of a mobile phone application (app) to a lux meter. Methods: A prospective, contextual, descriptive study was conducted, testing the illumination of 43 laryngoscopes with a lux meter, as well as a mobile phone app. The illumination field size of each laryngoscope was determined. Results: ISO Standard for illumination was met by 8 (18.6%) laryngoscopes, and 11 (25.5%) had an adequate illumination field. Only 4 (9.3%) laryngoscopes met both criteria. The mobile phone app readings were significantly different from those obtained with a lux meter (p = 0.0008). After battery replacement 23 further laryngoscopes demonstrated an adequate illuminance. No significant difference was found between incandescent and fibreoptic laryngoscope illuminance (p = 0.86). Conclusion: This study demonstrated that the available laryngoscopes had poor illuminance. A mobile phone app was not comparable to a lux meter. Routine objective illuminance testing as well as regular battery changes are suggested to be implemented.

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Section: Discussionsupporting

confidence: 54%

Section: Foundmentioning

confidence: 97%