Nagatomo Kanae, Mitsui Masamitsu, Masuyama Tomoyuki, Iizuka Yusuke, Shiozuka Junji
Introduction: To date, sleep has not been realistically assessed in patients in intensive care units, where sleep disturbances are common. This study aimed to validate a portable EEG monitor as a sleep monitoring device in comparison with polysomnography (PSG) for objective sleep assessment and with the Richards-Campbell Sleep Questionnaire (RCSQ) for subjective sleep quality assessment.
Methods: In this observational study, sleep patterns of 10 adult patients admitted to the ICU for at least 72 hours were assessed over 24 hours using PSG and SedLine's Patient State Index (PSI). In addition, their nighttime sleep was subjectively scored using the RCSQ to compare with objective parameters.
Results: Sleep architecture on PSG showed an increase in light sleep and a significant decrease in restorative sleep, although the amount of nocturnal sleep remained unchanged. PSI was distributed according to sleep depth according to PSG results. Subjective quality of nocturnal sleep on RCSQ correlated with PSI (r=-0.816, 95% confidence interval [CI]: -0.955 to -0.383) and also with the nocturnal stage N2 ratio on PSG alone (r=0.741, 95% CI: 0.209 to 0.935) or combined with restorative sleep (r=0.801, 95% CI: 0.347 to 0.951). The PSI cutoff value for distinguishing between N1 and N2 stages was 67.0 (specificity, 0.641; sensitivity, 0.845, area under the curve [AUC], 0.818).
Conclusion: SedLine is considered to be a feasible and valid tool for assessing sleep quality in ICU patients.
English 
Spanish 
Russian 
German 
French 
Japanese 
Portuguese 
Hindi