Patterns of comorbidity and the use of health services in the Dutch population.

The study objective was to examine the relation between combinations of chronic conditions in the same person and the volume and variety of health care utilization. Methods: Analysis of continuous Netherlands Health Interview Survey data (1990-1997). The study population consisted of adults (16 years and older) reporting at least one chronic condition from the following six disease clusters: musculoskeletal diseases, lung diseases, neurological disorders, heart diseases, diabetes, and cancer (n=13,806). Health care utilization is categorized in terms of contacts in the preceding year with a general practitioner (GP), medical specialist, physiotherapist, home help and/or home nursing, and hospital admission. Utilization was adjusted for age, gender and year of interview. Statistical methodes used are contingency table analysis and (logistic) multiple regression. Results: Almost one-fifth of the study population reported more than one chronic condition. musculoskeletal disease, in addition to being the most common single condition, was found to be condition most likely to occur with one of the remaining five disease clusters. Seven per cent reported not having used any services at all. Two-thirds of the study population used at least two different services in the previous year. In contrast, 26% of the study population reported comprehensive utilization patterns (GP and/or home care and/or physiothreapist and/or medical specialist and/or hospitalization: minimum of three types). Persons with more than one chronic conditions reported having used more services, in terms of volume and variety, than those with only one condition. Conclusion: There is a strong association between comorbidity and the volume and variety of health care services that are used. Since many people have comorbid conditions, their use of health services is more complex than would be suggested by a one-disease approach. New diesease management systems need to be developed to reflect the multiplicity of health care needs of the growing number patients with more than one chronic condition. (aut. ref.

Causes and consequences of comorbidity: a review.

A literature search was carried out to identify and summarize the existing information on causes and consequences of comorbidity of chronic somatic diseases. A selection of 82 articles met our inclusion criteria. Very little work has been done on the causes of comorbidity. On the other hand, much work has been done on consequences of comorbidity, although comorbidity is seldom the main subject of study. We found comorbidity in general to be associated with mortality, quality of life, and health care. The consequences of specific disease combinations, however, depended on many factors. We recommend more etiological studies on shared risk factors, especially for those comorbidities that occur at a higher rate than expected. New insights in this field can lead to better prevention strategies. Health care workers need to take comorbid diseases into account in monitoring and treating patients. Future studies on consequences of comorbidity should investigate specific disease combinations