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An investigation into the factors affecting adherence to drug treatment in an adult cystic fibrosis population P. Kelly, Department of Respiratory Medicine & Cystic Fibrosis, Belfast City HospitaL, UK
Aims: Adherence to therapy is an important issue in Cystic Fibrosis as non-adherence may have a negative effect on disease status and progression. The present study was undertaken to determine the influence of the following factors on adherence to drug treatment in adults with cystic fibrosis, knowledge of medication & disease state, perceived positive benefits from taking medication and problems associated with taking a particular drug. Method: Data were collected using a questionaire and face-to-face interviews with cystic fibrosis adults at Belfast City Hospital. Specific questions were asked to ascertain patient's knowledge of disease and their medication. Perceived positive benefits of medicines was assessed using the Beliefs about Medicines Questionaire (BMQ) . Self-reported compliance was used to assess adherence to drug treatment. Patients were asked if they skipped doses, forget to take medication or run out of medication. Results: 44 patients participated in the study. No correlation between compliance and patient knowledge of their medication or disease state was observed (p=0.678 and p=0.87 respectively). A higher BMQ score was found in adherent patients with a mean of 41 compared to 37 in the non-compliant population (n=22, p=0.06). Scores ranged from 26 to 49 and the most frequent score was 37. There was a negative correlation between patients experiencing problems taking their medication (eg suffering side-effects) and adherence with these medicines (p=0.04). Conclusions: This study suggests that a major factor determining compliance is patients perceived benefits of medication. Increased knowledge about disease state and medication is not related to better compliance. If a patient experiences problems with medicines (eg experiences side-effects) it has a negative effect on compliance. Reference 1. Horne, R. Weinman, J, Hankins, M. (1999) The Beliefs about Medicines Questionaire: The development and evaluation of a new method for assessing the cognitive representation of medication. Psychology and Health 14, 1-24.
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