Improving Health in People With Multimorbidity: a Paradigm Shift in Health Care From Disease-based Curative Models to Personalized Exercise Therapy and Self-management

Chronic conditions such as knee or hip osteoarthritis (OA), chronic obstructive pulmonary disease (COPD), heart failure (HF), coronary heart disease (CHD), hypertension, type 2 diabetes mellitus (T2DM) and depression are among the leading causes of global disability and affect hundreds of millions of people around the world. In recent years, multimorbidity, commonly defined as the co-occurrence of at least two chronic conditions, has also gained interest due to its substantial impact on the person and society. In general, multimorbidity affects more than half of all people with chronic conditions. Two out of three people with OA have comorbidities, with HF, CHD, hypertension, T2DM, COPD and depression being some of the most common.

People with multimorbidity account for 78% of all consultations in primary care and multimorbidity is associated with poorer function and quality of life, depression, intake of multiple drugs and increased health care utilization, with some studies demonstrating an almost exponential relationship between the number of chronic conditions and their health care costs. Furthermore, we know from qualitative research that treating one condition at a time is inconvenient, inefficient and unsatisfactory for the person with the chronic conditions and his or her health care provider. Most research so far has excluded people with multimorbidity, due to its focus on only one specific condition, and most of the health care sector manages each individual condition on its own instead of the person, highlighting the negative impact of the current disease-based curative models on multimorbidity. With a population that is ageing, and a significant number of people with multimorbidity being younger than 65 years of age, the proportion of people with multimorbidity is increasing rapidly, emphasizing the need to take action to deal with the increasing burden of chronic conditions and multimorbidity through treatment and prevention.

Identifying and developing effective and affordable treatment strategies to deal with the global burden of chronic conditions and multimorbidity is a major focus of modern health care around the world. Despite the significant burden of multimorbidity, little is known about how to treat this effectively. A 2016 Cochrane systematic review found that interventions targeting populations with specific combinations of conditions and addressing specific problems such as functional difficulties may be more effective. A treatment addressing functional limitations that is able to improve symptoms in at least 26 chronic conditions, including OA, HF, CHD, hypertension, T2DM, COPD and depression is readily available. This treatment is exercise therapy, which is effective, safe and supported by substantial evidence in patients with knee and hip OA, HF and CHD, hypertension, T2DM, COPD, depression and a range of other chronic conditions. A new systematic review found that exercise seems effective in people with multimorbidity (the conditions included in the current study), however highlighting the need for further high-quality RCTs. Furthermore, self-management support is increasingly recognized as an essential component of interventions to improve outcomes in patients living with multimorbidity. There is increasing evidence that effective management of multimorbidity requires the active participation by patients in the care process. Self-management support interventions have been shown to change health behaviors, improve health status, and reduce health care utilization and costs. Self-management support is centered on enabling patients to develop a set of behavioral skills and abilities to help them navigate a range of disease management tasks across different chronic conditions.

In an RCT of people with knee OA, published in the New England Journal of Medicine, we found that 3 out of 4 patients eligible for total knee replacement improved enough from self-management support, supervised exercise therapy and other non-surgical treatments to postpone surgery for at least one year. Furthermore, in patients with T2DM, 56% did not take antidiabetic medication after 1 year of supervised exercise therapy, self-management support and diet. Together, these studies indicate the potential of combining exercise, self-management and other treatments to reduce the need for surgery and medication. A recent cohort study found that an eight-week exercise and self-management program demonstrated similar improvements in health outcomes for people with OA and the comorbidities included in the current study as for people without comorbidities.

Altogether, this highlights exercise therapy and self-management support as viable treatment options for people with multimorbidity, but the evidence supporting this is of low quality and more high-quality RCTs are needed to improve care for the millions of people suffering from multimorbidity worldwide.