An audit of laryngoscopes and application of a new ISO standard

Baker, Paul; McQuoid, Shane; Thompson, Graham C.; Jacobs, Robert J.

doi:10.1111/j.1460-9592.2011.03525.x

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…1,2,7 Another children's hospital audit of 18 anesthesia department laryngoscopes found that half did not meet these literature standards, and only 1 device met the ISO standard. 8 In a manikin study, a group of anesthesiologists found only 1 of 16 laryngoscopes produced the median acceptable light on each reading and the minimum acceptable light for all testers. 9 In most cases, the amount of light required to intubate an airway is less than that required for an otolaryngologist to characterize airway pathologic conditions.…”

Section: Discussionmentioning

confidence: 99%

Laryngoscope Illuminance in a Tertiary Children’s Hospital

Volsky

Murphy

Darrow

2014

JAMA Otolaryngol Head Neck Surg

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At our facility, approximately one-third of incandescent laryngoscopes exhibited substandard light output. On the basis of these findings, our hospital has converted all of its incandescent laryngoscopes to light-emitting diode (LED) devices. Such changes, as well as the institution of a quality-control program including scheduled laryngoscope inspection and battery and bulb replacement for incandescent laryngoscopes, may reduce adverse events associated with poor-quality direct laryngoscopy.

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Section: Discussionmentioning

confidence: 99%

Laryngoscope Illuminance in a Tertiary Children’s Hospital

Volsky

Murphy

Darrow

2014

JAMA Otolaryngol Head Neck Surg

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“…The ISO 7376:2009 standard describes limits for the distribution of light as well as the illuminance. A published audit of laryngoscope xenon bulb light illuminance and spread found that out 18 disposable laryngoscopes, none complied with the ISO standard for light distribution [5]. Whilst this audit used different manufacturers and different bulbs, the case study and image presented show the light distribution is clearly scattered unevenly with the McGrath ® MAC.…”

Section: Discussionmentioning

confidence: 90%

“…For manufacturers of laryngoscopes the International Organisation for Standardisation (ISO) recommends a minimum level of 500 lux for at least 10 minutes [2]. A published audit of laryngoscope xenon bulb light illuminance and spread found that out 18 disposable laryngoscopes, none complied with the ISO standard for light distribution [5]. The images in the figure show a more confluent and dense light from the ProAct ® Metal Max compared with the McGrath ® MAC (figure 1).…”

Section: Discussionmentioning

confidence: 99%

McGrathMAC versus ProAct illumination during laryngoscopy in a pre‐hospital patient with maxillofacial trauma

Gillespie¹,

Dunn

2016

Anaesthesia Cases

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During a case of pre-hospital anaesthesia, the presence of dried oropharyngeal blood from maxillo-facial trauma was found to adversely affect illumination when using the McGrath ® MAC enhanced direct laryngoscope, using both direct laryngoscopy and video-laryngoscopy via its LCD screen. A second attempt using direct laryngoscopy with a standard battery handle operated laryngoscope (ProAct ® Metal Max 100) was noted to provide far superior light quality, intensity and spread. Subsequent comparison of light under basic test conditions demonstrated lower luminance and spread of light with the McGrath ® MAC when compared with the standard ProAct ® (both with Macintosh size 4 attachments).

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“…13 A study by Murphy et al 7 of 691 laryngoscopes found that 28% did not meet the minimum required 500 lux at 10 minutes. Baker et al 14…”

Section: Introductionmentioning

confidence: 99%

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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An audit of laryngoscopes and application of a new ISO standard

Cited by 10 publications

References 12 publications

Laryngoscope Illuminance in a Tertiary Children’s Hospital

Laryngoscope Illuminance in a Tertiary Children’s Hospital

McGrathMAC versus ProAct illumination during laryngoscopy in a pre‐hospital patient with maxillofacial trauma

The illuminance of laryngoscopes at two central hospitals

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