Human-Caused Sound Distractors and their Impact on Operating Room Team Function.

BACKGROUND: Patient safety in the Operating Room (OR) depends on unobstructed team communication. Yet the typical OR is loud, containing numerous sounds from surgical machinery overlayed with human-caused sounds. Our objective was to compare machine vs human-caused sounds for their loudness and distraction, and potential impact on team communication. METHODS: After surveying OR staff about sounds that interfere with job performance and team communication, we recorded 19 machine and 48 human-caused sounds measuring their acoustical intensity. We compared peak measures of machine vs human-caused sound loudness, using Student's t-test. We observed the effect of these sounds on OR staff in 59 live surgeries, rating level of interference with team function. We visually depicted competing sounds through a spectral analysis. RESULTS: The survey response rate was 62.8%. 93% of respondents indicated that OR noise, especially human-caused sounds such as irrelevant conversations, interfere with team communication, hearing, and focus. OR peak decibel levels ranged from 56.8 dB (surgical packaging) to 105.0 dB (kicked metal stepstool). Human-caused sounds were comparable to machine-caused sounds in terms of mean peak dB levels (77.0 versus 73.8 dB, p = 0.32), yet were rated as more interfering with surgical team function. The spectral analysis illustrated both machine and human-caused sound sources obscuring the surgeon's instructions. CONCLUSIONS: Avoidable human-caused sounds are a major source of disruption in the OR and interfere with communication and job performance. We recommend surgical team training to minimize these distractions.

The Impact of Facial Personal Protective Equipment on Speech Intensity.

IMPORTANCE: Facial personal protective equipment (FPPE) filters small particles in the operating room (OR) but also affects speech production, diminishing the effective transfer of information among OR team members. OBJECTIVE: The aim of the study is to assess the attenuating effects of different combinations of layered FPPE on speech intensity, including potential differences in the effect of talkers with varying backgrounds and speaking volumes. STUDY DESIGN: We recruited 30 speakers from health and nonhealth occupations with English as either their first or second language. All participants spoke unmasked, at varying voice levels into a portable Zoom H4n device 12 inches from the microphone. These no-mask recordings were played from a Styrofoam head, fitted with 7 combinations of FPPE commonly worn in the COVID-19 era, with the attenuated signals assessed for digital average signal levels. We submitted these attenuation values to an omnibus mixed analysis of variance and performed a spectral analysis on signal attenuation stratified by typical speech frequency bands. RESULTS: Signal attenuation was strongly determined by FPPE combination, regardless of talker sex, first language, and occupation ( P < 0.01, η 2p = 0.881). The effects of vocal output were also significant ( P < 0.01, η 2p = 0.881). Soft talkers experienced particularly high attenuation at frequency bands higher than 2,000 Hz. The signal of the softest talkers, when asked to speak loudly, was similar to the loud talkers' signal. CONCLUSIONS: Layered FPPE in the OR protects the surgical team from small particle exposure but may increase communication failures. Our data can help OR staff choose FPPE and alter their vocal volume accordingly.