Mental, physical, and cognitive impairments of COVID-19 patients admitted to intensive care during the pandemic in Chile: An observational, multicentre study

ABSTRACT

Introduction: Mental, physical, and cognitive impairments are common after an intensive care unit (ICU) stay. It remains unknown to what extent the extraordinary increase in bed occupancy during the pandemic could be linked to the severity and frequency of patient's impairments. Objective: To determine the frequency, severity, and risk factors for mental, physical, and cognitive impairments at ICU discharge during high and low bed occupancy periods. Methods: Prospective cohort study in seven Chilean ICUs (ClinicalTrials.gov Identifier NCT04979897). We included adults, mechanically ventilated >48 hours in the ICU who could walk independently prior to admission. Trained physiotherapists assessed the Medical Research Council Sum-Score (MRC-SS), Montreal Cognitive Assessment (MOCA-blind), Hospital Anxiety and Depression Scale (HADS), Impact of Event Scale-Revised (IES-R), and the World Health Organization Disability Assessment Schedule (WHODAS 2.0) at ICU discharge. Pre-admission employment status, educational level, and Clinical Frailty Scale (CFS) were also collected. We compared periods of low and high bed-occupancy, defined as less or more than 90% of staffed ICU beds occupied. We used t-test for normally distributed, Mann-Whitney for those not normally distributed, and chi-square for categorical variables. We explored risk factors for mental, physical, and cognitive impairments using logistic regression adjusted for age, sex, educational level, and bed occupancy. Analyses were performed in Stata/SE 16.0. Results: We included 192 patients with COVID-19 of which 126 [66%] were admitted during a high bedoccupancy period (January to April 2021). Majority were male (137 [71%]) and worked full-time (127 [66%]). Median [P25-P75] age was 57 [47-67], length of ICU stay was 15[ 11-27] days, and duration of mechanical ventilation (MV) was 9 [6-16.5] days. Seven (4%) patients were clinically frail, 65 (34%) had ICUacquired weakness (ICU-AW), 134(70%) had cognitive impairment, 122 (64%) had post-traumatic stress symptoms (PTSS), 53 (28%) had depressive symptoms, 106 (55%) had anxiety symptoms, and 148 (77%) had severe disability. Table 1 shows the combined prevalence of physical and mental health problems. Patients admitted during the high-occupancy period were younger (mean 54, 95% confidence interval [47, 61] vs 61 [58, 64]), more likely to have a higher education qualification(HEQ) (OR 1.67 [0.9, 3.06]), and had a shorter duration of MV (8 [6-13] vs 13 [8-34];p<0.001) and ICU stay (13 [10-19] vs 21.5 [13-42];p<0.001). Mental, physical, and cognitive impairments were similar in low and high occupancy periods. Patients with a HEQ were less likely to have ICU-AW (OR 0.23 [0.11, 0.46]), cognitive impairments (OR 0.26 [0.11, 0.6]), symptoms of depression (OR 0.45 [0.22, 0.9]) or anxiety (OR 0.26 [0.13, 0.5]), and severe disability (OR 0.4 [0.18, 0.94]). Females were more likely to have ICU-AW (OR 2.4 [1.13, 4.93]). Older patients were less likely to suffer PTSS (OR 0.97 [0.94, 0.99] per year old). Conclusions: Majority of patients had at least one mental, physical or cognitive impairment being similar by bed occupancy. Having a higher education qualification was the main protective factor for impairments at ICU discharge. Preventative treatments programmes should target patients with <12 years of education.