• Crit Care · Mar 2022

    Distribution of delirium motor subtypes in the intensive care unit: a systematic scoping review.

    • Kirstine N la Cour, Nina C Andersen-Ranberg, Sarah Weihe, Lone M Poulsen, Camilla B Mortensen, Cilia K W Kjer, Marie O Collet, Stine Estrup, and Ole Mathiesen.
    • Department of Anesthesiology, Centre for Anaesthesiological Research, Zealand University Hospital, Koege, Denmark. klac@regionsjaelland.dk.
    • Crit Care. 2022 Mar 3; 26 (1): 53.

    BackgroundDelirium is the most common cerebral dysfunction in the intensive care unit (ICU) and can be subdivided into a hypoactive, hyperactive, or mixed motor subtype based on the clinical manifestation. The aim of this review was to describe the distribution, pharmacological interventions, and outcomes of delirium motor subtypes in ICU patients.MethodsThis systematic scoping review was performed according to the PRISMA-ScR and Cochrane guidelines. We performed a systematic search in six major databases to identify relevant studies. A meta-regression analysis was performed where pooled estimates with 95% confidence intervals were computed by a random effect model.ResultsWe included 131 studies comprising 13,902 delirious patients. There was a large between-study heterogeneity among studies, including differences in study design, setting, population, and outcome reporting. Hypoactive delirium was the most prevalent delirium motor subtype (50.3% [95% CI 46.0-54.7]), followed by mixed delirium (27.7% [95% CI 24.1-31.3]) and hyperactive delirium (22.7% [95% CI 19.0-26.5]). When comparing the delirium motor subtypes, patients with mixed delirium experienced the longest delirium duration, ICU and hospital length of stay, the highest ICU and hospital mortality, and more frequently received administration of specific agents (antipsychotics, α2-agonists, benzodiazepines, and propofol) during ICU stay. In studies with high average age for delirious patients (> 65 years), patients were more likely to experience hypoactive delirium.ConclusionsHypoactive delirium was the most prevalent motor subtype in critically ill patients. Mixed delirium had the worst outcomes in terms of delirium duration, length of stay, and mortality, and received more pharmacological interventions compared to other delirium motor subtypes. Few studies contributed to secondary outcomes; hence, these results should be interpreted with care. The large between-study heterogeneity suggests that a more standardized methodology in delirium research is warranted.© 2022. The Author(s).

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