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Annals of Intensive Care
Published in: Annals of Intensive Care 1/2018

Open Access 01-12-2018 | Research

Association of intensive care unit delirium with sleep disturbance and functional disability after critical illness: an observational cohort study

Authors: Marcus T. Altman, Melissa P. Knauert, Terrence E. Murphy, Amy M. Ahasic, Zeeshan Chauhan, Margaret A. Pisani

Published in: Annals of Intensive Care | Issue 1/2018

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Abstract

Background

In medical intensive care unit (MICU) patients, the predictors of post-discharge sleep disturbance and functional disability are poorly understood. ICU delirium is a risk factor with a plausible link to sleep disturbance and disability. This study evaluated the prevalence of self-reported post-ICU sleep disturbance and increased functional disability, and their association with MICU delirium and other ICU factors.

Methods

This was an observational cohort study of MICU patients enrolled in a biorepository and assessed upon MICU admission by demographics, comorbidities, and baseline characteristics. Delirium was assessed daily using the Confusion Assessment Method for the ICU. Telephone follow-up interview instruments occurred after hospital discharge and included the Pittsburgh Sleep Quality Index (PSQI), and basic and instrumental activities of daily living (BADLs, IADLs) for disability. We define sleep disturbance as a PSQI score > 5 and increased disability as an increase in composite BADL/IADL score at follow-up relative to baseline. Multivariable regression modeled the associations of delirium and other MICU factors on follow-up PSQI scores and change in disability scores.

Results

PSQI and BADL/IADL instruments were completed by 112 and 122 participants, respectively, at mean 147 days after hospital discharge. Of those surveyed, 63% had sleep disturbance by PSQI criteria, and 37% had increased disability by BADL/IADL scores compared to their pre-MICU baseline. Total days of MICU delirium (p = 0.013), younger age (p = 0.013), and preexisting depression (p = 0.025) were significantly associated with higher PSQI scores at follow-up. Lower baseline disability (p < 0.001), older age (p = 0.048), and less time to follow-up (p = 0.024) were significantly associated with worsening post-ICU disability, while the occurrence of MICU delirium showed a trend toward association (p = 0.077).

Conclusions

After adjusting for important covariates, total days of MICU delirium were significantly associated with increased post-discharge sleep disturbance. Delirium incidence showed a trend toward association with increased functional disability in the year following discharge.
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Metadata
Title
Association of intensive care unit delirium with sleep disturbance and functional disability after critical illness: an observational cohort study
Authors
Marcus T. Altman
Melissa P. Knauert
Terrence E. Murphy
Amy M. Ahasic
Zeeshan Chauhan
Margaret A. Pisani
Publication date
01-12-2018
Publisher
Springer International Publishing
Published in
Annals of Intensive Care / Issue 1/2018
Electronic ISSN: 2110-5820
DOI
https://doi.org/10.1186/s13613-018-0408-4

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