Title

The dynamics of chronic gout treatment: medication gaps and return to therapy

UMMS Affiliation

Meyers Primary Care Institute; Department of Medicine, Division of Rheumatology; Clinical and Population Health Research Program

Date

1-28-2010

Document Type

Article

Medical Subject Headings

Age Factors; Aged; Allopurinol; Anti-Inflammatory Agents, Non-Steroidal; Chi-Square Distribution; Chronic Disease; Cohort Studies; Colchicine; Dose-Response Relationship, Drug; Drug Administration Schedule; Female; Follow-Up Studies; Glucocorticoids; Gout; Gout Suppressants; Humans; Kaplan-Meiers Estimate; Male; Middle Aged; Patient Compliance; Probability; Proportional Hazards Models; Risk Assessment; Severity of Illness Index; Sex Factors; Time Factors; Treatment Outcome; Uric Acid

Disciplines

Health Services Research | Medicine and Health Sciences

Abstract

OBJECTIVE: To identify gaps in therapy with urate-lowering drugs for the treatment of gout as well as factors associated with resuming therapy.

METHODS: From 2 integrated delivery systems, we identified patients 18 years or older with a diagnosis of gout who initiated use of a urate-lowering drug from January 1, 2000 through June 30, 2006 and who had a gap in therapy. A gap was defined as a period of over 60 days after the completion of 1 prescription in which no refill for a urate-lowering drug was obtained. Survival curves were used to assess return to therapy of urate-lowering drugs. Cox proportional hazards analysis estimated the association between covariates and return to therapy.

RESULTS: There were 4166 new users of urate-lowering drugs (97% received allopurinol), of whom 2929 (70%) had a gap in therapy. Among those with a gap, in 75% it occurred in the first year of therapy. Fifty percent of patients with a gap returned to therapy within 8 months, and by 4 years it was 75%. Age 45-74 years (<45 referent) and greater duration of urate-lowering drug use before the gap was associated with resuming treatment within 1 year. In contrast, receipt of nonsteroidal anti-inflammatory drugs or glucocorticoids in the year before the gap was associated with a reduced likelihood of resuming therapy.

CONCLUSIONS: The majority of gout patients with gaps in urate-lowering drug use returned to treatment. More investigation is needed to better understand why patients may go for months without refilling prescriptions, given the clinical consequences of nonadherence.

Rights and Permissions

Citation: Am J Med. 2010 Jan;123(1):54-9. Link to article on publisher's site

Related Resources

Link to Article in PubMed

PubMed ID

20102992