[Relationship between health-related quality of life and multimorbidity]

Changed morbidity patterns in many industrialised countries lead to new requirements concerning the health-care process. In contrast to a complete cure and due to increasing (multiple) chronic conditions with longevity, the alleviation of complaints and thereby securing the health-related quality of life (HRQoL) is coming more and more into the focus of efforts. The objective of this review is to analyse the effects of (multiple) chronic conditions on HRQoL. Another aim is to ascertain to what extent the number and specific combination of conditions have an impact on HRQoL.

This review is based on a systematic literature search using MeSH terms in Medline/Pubmed and several publisher databases. Inclusion criteria focus particularly on the relationship between multimorbidity and HRQoL.

Findings of the literature search clearly show that existing chronic conditions have a negative impact on HRQoL. Most studies conclude that the quality of life decreases with an increasing number of diseases. In comparison to mental or social dimensions, the inverse relationship between multimorbidity and HRQoL is significantly stronger in physical dimensions. Particularly cardiovascular diseases and musculoskeletal disorders result in severe losses of HRQoL. Furthermore, the HRQoL is reduced by specific disease combinations. Patterns of disease combinations influence the degree of HRQoL loss, as well.

A clear understanding of the impacts of multimorbidity and specific morbidity patterns on the different dimensions of HRQoL can help to optimise the health-care process for the patients benefit. This optimised process should not separate between single diagnoses, but focus on the concurrence of multiple conditions having regard to patient-relevant outcome HRQoL. For example, one potential is to focus efforts on key conditions in the cooccurrence of multiple diseases (like musculoskeletal disorders). The current state of research on specific morbidity patterns and their impacts on HRQoL is limited. Especially for the German-speaking areas further analyses are needed.