Objective: To compare the incidence of, and mortality after, intensive care unit (ICU) admission as well as the characteristics of critical illness in the multiple sclerosis (MS) population vs the general population.Methods: We used population-based administrative data from the Canadian province of Manitoba for the period 1984 to 2010 and clinical data from 93% of admissions to provincial high-intensity adult ICUs. We identified 5,035 prevalent cases of MS and a cohort from the general population matched 5:1 on age, sex, and region of residence. We compared these populations using incidence rates and multivariable regression models adjusting for age, sex, comorbidity, and socioeconomic status.Results: From January 2000 to October 2009, the age-and sex-standardized annual incidence of ICU admission among prevalent cohorts was 0.51% to 1.07% in the MS population and 0.34% to 0.51% in matched controls. The adjusted risk of ICU admission was higher for the MS population (hazard ratio 1.45; 95% confidence interval [CI] 1.19-1.75) than for matched controls. The MS population was more likely to be admitted for infection than the matched controls (odds ratio 1.82; 95% CI 1.10-1.32). Compared with the matched controls admitted to ICUs, 1-year mortality was higher in the MS population (relative risk 2.06; 95% CI 1.32-3.07) and was particularly elevated in patients with MS who were younger than 40 years (relative risk 3.77; 95% CI 1.45-8.11). Causes of death were MS (9.3%), infections (37.0%), and other causes (52.9%).
Conclusions:Compared with the general population, the risk of ICU admission is higher in MS, and 1-year mortality after admission is higher. Greater attention to preventing infection and managing comorbidity is needed in the MS population. Neurology ® 2014;82:2112-2119 GLOSSARY APACHE II 5 Acute Physiology and Chronic Health Evaluation II; CCI 5 Charlson Comorbidity Index; CI 5 confidence interval; HR 5 hazard ratio; ICD-9-CM 5 International Classification of Diseases, ninth revision, Clinical Modification; ICD-10 5 International Classification of Diseases, tenth revision; ICU 5 intensive care unit; IRR 5 incidence rate ratio; MS 5 multiple sclerosis; OR 5 odds ratio; SES 5 socioeconomic status.Intensive care units (ICUs) are an important component of hospital care, consuming a disproportionate share of medical costs in industrialized countries.1-4 While chronic diseases are established risk factors for ICU admission and mortality, 5,6 little is known about the influence of immune-mediated diseases such as multiple sclerosis (MS) on ICU admissions. MS is associated with increased risks of infection 7 and ischemic heart disease, 8,9 which could increase the risk of ICU admission. However, hospitalized elderly patients with MS have been reported to be less likely to use intensive or coronary care services than other patients. 10 The risk of ICU admission in the nonelderly MS population has not been studied, and outcomes after ICU admission are largely unknown.11 Knowledge of the characteristics and out...