Researchers reviewed 70 ICU patient charts and recorded in-room activities between midnight and 4:00 a.m. Based on this chart review and via direct observation, they also identified the key elements of nocturnal patient disruption. Results showed significant in-room activity and sound level maximums that exceeded 83 dB(C) every hour between midnight and 4:00 a.m. in every room monitored, which exceeds the sound levels recommended by WHO.
Researchers conclude that sleep disruption in the ICU is prevalent and may be linked to delirium and immune dysfunction, as well as potentially worse outcomes due to patient sleep deprivation. This study was presented during CHEST 2012, the annual meeting of the American College of Chest Physicians.
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