Using Clinically Accessible Tools to Measure Sound Levels and Sleep Disruption in the ICU: A Prospective Multicenter Observational Study

Objectives: To use clinically accessible tools to determine unit-level and individual patient factors associated with sound levels and sleep disruption in a range of representative ICUs. Design: A cross-sectional, observational study. Setting: Australian and New Zealand ICUs. Patients: All patients 16 years or over occupying an ICU bed on one of two Point Prevalence study days in 2015. Interventions: Ambient sound was measured for 1 minute using an application downloaded to a personal mobile device. Bedside nurses also recorded the total time and number of awakening for each patient overnight. Measurements and Main Results: The study included 539 participants with sound level recorded using an application downloaded to a personal mobile device from 39 ICUs. Maximum and mean sound levels were 78 dB (SD, 9) and 62 dB (SD, 8), respectively. Maximum sound levels were higher in ICUs with a sleep policy or protocol compared with those without maximum sound levels 81 dB (95% CI, 79–83) versus 77 dB (95% CI, 77–78), mean difference 4 dB (95% CI, 0–2), p

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