Actigraphy may overestimate sleep in ICU setting
Kristin E. Schwab, M.D., from the University of California in Los Angeles, and colleagues conducted a systematic review of ICU-based studies that used actigraphy as a surrogate measure of sleep in critically ill patients. Thirteen studies, conducted in 10 countries, met the inclusion criteria.
The researchers found that across the studies, the mean total sleep time, as estimated using actigraphy varied from 4.4 to 7.8 hours at nighttime and from 7.1 to 12.1 hours over a 24-hour period for ICU patients. There were 1.4 to 49.0 mean nocturnal awakenings and sleep efficiency ranged from 61 to 75 percent. Compared with other measures of sleep (polysomnography, nurse assessments, and patient questionnaires), higher total sleep time and sleep efficiency were consistently seen with actigraphy, as well as fewer nighttime awakenings, and more overall awakenings. The correlation between actigraphy-based measures of sleep and outcomes in the ICU was not assessed in any of the studies.
"Larger, more rigorous and standardized studies are needed to better understand the role of actigraphy in evaluating sleep and sleep-related outcomes in critically ill patients," the authors write.
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