Prophylactic use of exogenous melatonin and melatonin receptor agonists to improve sleep and delirium in the intensive care units: a systematic review and meta-analysis of randomized controlled trials
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Abstract
To investigate the efficacy of exogenous administration of melatonin and melatonin receptor agonists for the improvement of delirium, sleep, and other clinical outcomes of subjects in the intensive care unit (ICU). We carefully searched three electronic databases, i.e., Pubmed/Medline, Embase, and Cochrane library, to retrieve randomized controlled trials (RCTs) administrating melatonin or melatonin receptor agonists to adult subjects admitted to the ICU. Useful data such as the prevalence of delirium, duration of sleep, number of awakenings per night, duration of mechanical ventilation, and ICU stay as well as in-ICU mortality were extracted and pooled by using a random effect model. Eight RCTs were included in the qualitative analysis. Administration of exogenous melatonin and melatonin receptor agonists was associated with a trend towards elongated duration of sleep (pooled weighted mean difference/WMD = 0.43; 95% confidence intervals/CIs, − 0.02~0.88, p = 0.063) and could decrease the number of awakenings per night (pooled WMD = − 2.03; 95% CIs, − 3.83~− 0.22, p = 0.028). Meanwhile, participants in the treatment group showed a significantly reduced prevalence of delirium (pooled risk ratio/RR = 0.49; 95% CIs, 0.28~0.88, p = 0.017) and duration of ICU stay (pooled WMD = − 0.32; 95% CI, − 0.56~− 0.07, p = 0.002) in comparison with those in the control group. Exogenous administration of melatonin and melatonin receptor agonists could improve the sleep of subjects in the intensive care units, which may play an important role in decreasing the prevalence of delirium and shortening duration of ICU stay.
Keywords
Intensive care unit Delirium Melatonin Circadian rhythms Sleep deprivation Meta-analysisNotes
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical approval
For this study, ethical approval is not required.
Informed consent
For this type of study, formal consent is not required.
Supplementary material
Forest plot and sensitivity analysis of the comparison about sleep duration by using data from secondary analysis of Bourne et al’ study. As depicted, the diamond intersecting the central vertical line represents no differences between the treatment group and the control group (a & c & e). These results were stable in sensitivity analysis when omitting studies one by one (b & d). CI, confidence interval; WMD, weighted mean difference; SD, standard deviation (PNG 1185 kb)
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