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Predicting ongoing adherence to disease modifying therapies in multiple sclerosis: utility of the health beliefs model

VA Puget Sound Health Care System, VA Multiple Sclerosis Center of Excellence West, VA Center of Excellence in Substance Abuse Treatment and Education, Department of Rehabilitation Medicine, University of Washington, WA, USA, Aaron.Turner{at}va.gov

D.R. Kivlahan

VA Puget Sound Health Care System, VA Center of Excellence in Substance Abuse Treatment and Education, Department of Psychiatry and Behavioral Sciences, University of Washington, WA, USA

A.P. Sloan

VA Puget Sound Health Care System, VA Multiple Sclerosis Center of Excellence West

J.K. Haselkorn

VA Puget Sound Health Care System, VA Multiple Sclerosis Center of Excellence West, Department of Rehabilitation Medicine, University of Washington, WA, USA, Department of Epidemiology, University of Washington, WA, USA

Objective To evaluate ongoing adherence to disease modifying therapies (DMT) among individuals with multiple sclerosis and test the utility of the Health Beliefs Model (HBM) to predict adherence.

Design Telephone survey completed at baseline with monthly telephone follow-up for 6 months.

Setting Veterans Health Administration.

Participants Eighty-nine veterans with MS actively enrolled in a regional VA MS outpatient clinic currently prescribed DMT.

Measures Demographic information. Selected items from the Adherence Determinants Questionnaire (ADQ) and Barriers to Care Scale (BACS).

Results Adherence in this population of ongoing DMT users was relatively high (over 80% achieved 80% adherence at follow-up time points). Logistic regression and hierarchical multiple regression analyses controlling for demographics and disease duration were employed to examine the relationship of HBM constructs of perceived susceptibility, severity, benefits, and barriers to DMT adherence and satisfaction at 2-, 4- and 6-month follow-up. Of the four HBM constructs, only perceived benefits uniquely predicted both outcomes across multiple time points.

Conclusion Sustained adherence to DMT remains a challenge for an important minority of individuals with MS. The Health Beliefs Model provides insight into psychosocial mechanisms that maintain adherence behavior. In particular, focus upon the perceived benefits of ongoing DMT therapy may be a promising focus for future interventions. Multiple Sclerosis 2007; 13: 1146—1152. http://msj.sagepub.com

Key Words: health beliefs • medication adherence • multiple sclerosis

Multiple Sclerosis, Vol. 13, No. 9, 1146-1152 (2007)
DOI: 10.1177/1352458507078911


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