Les impacts de la multimorbidité et des troubles mentaux sur les admissions à l'urgence

Authors: Gaulin, Myles
Advisor: Sirois, Caroline
Abstract: Multimorbidity, or the coexistence of multiple chronic illnesses, is a growing concern in industrialized countries. Multimorbidity is associated with increased healthcare use, including frequent emergency room admissions. Mental disorders affect up to 30% of people with multimorbidity. They are known to exacerbate physical illness and are also associated independently with frequent ER use. However, no previous study has examined their combined impact, which may differ from a simple combination of their effects. This difference is termed effect modification or interaction. We conducted a population-based cohort study using administrative data to determine whether mental disorders modify the impact of multimorbidity on frequent ER use. Our objectives were to measure this effect modification on the additive scale, in terms of numbers of admissions in a healthcare system, and the multiplicative scale, in terms of risk for individuals. On the additive scale, we found that physical multimorbidity and mental disorders interact positively, resulting in more admissions than addition of their effects would predict. Between 0 and ≥4 physical conditions, risk of frequent ER visits increased more for individuals with serious mental disorders (16.2%) than common (15.3%) or no disorders (11.4%). On the multiplicative scale, the increase in risk due to multimorbidity is relatively less important for those with mental disorders, because people with mental disorders already use the ER considerably more often than those without, before addition of physical multimorbidity. For people without mental disorders, odds of frequent ER visits with ≥4 physical conditions were 6.2 (CI 95%: 6.08; 6.35) times the odds for people without physical conditions. For individuals with common and serious mental illnesses, corresponding odds ratios were 4.75 (4.60; 4.90) and 3.37 (3.18; 3.57), respectively. Addditional research is necessary to promote high-quality care for mental illness, particularly in multimorbid individuals.
Document Type: Mémoire de maîtrise
Issue Date: 2019
Open Access Date: 1 August 2019
Permalink: http://hdl.handle.net/20.500.11794/35719
Grantor: Université Laval
Collection:Thèses et mémoires

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