Authors: Broder, Michael S.; Chang, Eunice Y.; Ory, Caron; Kamath, Tripthi; Sapra, Sandhya

Source: Allergy and Asthma Proceedings, Volume 30, Number 2, March/April 2009 , pp. 148-157(10)

Publisher: OceanSide Publications, Inc

Abstract:

Asthma control requires adherence with pharmacologic therapy. A medication's mode of delivery may affect adherence. The purpose of this study was to compare medication persistence and adherence between patients newly treated with either an inhaled or injected asthma medication. Using a propensity-score-matched retrospective cohort study, we evaluated medication persistence and adherence over 1 year in adult asthma patients newly treated with omalizumab or fluticasone (500 μg)/salmeterol (50 μg) (FSC 500/50). Kaplan-Meier analysis was conducted to compare persistence between users of FSC 500/50 and omalizumab using the log-rank test. We conducted four sensitivity analyses. After propensity matching, the study sample included 213 omalizumab patients and 426 FSC 500/50 patients, with no statistically significant differences between groups on baseline measures. Mean adherence rates were 64.6% for omalizumab and 29.5% for FSC 500/50 (p < 0.0001). Fifty-four percent of omalizumab users were persistent at 1 year compared with 18.5% of FSC 500/50 users (p < 0.0001). In sensitivity analyses, we stratified patients by evidence of allergy and the results did not change. Adherence was more than twice as high and persistence was almost twice as high among omalizumab compared with FSC 500/50 users. The direction of our findings was consistent across all sensitivity analyses. In both omalizumab and FSC 500/50 cohorts, persistence decreased substantially over 1 year. Our study suggests that injected medications may have advantages in asthma treatment. A comprehensive program to improve adherence should address not just administration route but also patient factors that prevent proper medication use.

Keywords: Adherence; asthma; cohort; fluticasone; insurance claim review; omalizumab; persistence; propensity score; route of administration; salmeterol

Document Type: Research article

DOI: http://dx.doi.org/10.2500/aap.2009.30.3190

Affiliations: 1: Partnership for Health Analytic Research, 280 South Beverly Drive, Suite 404, Beverly Hills, California

Publication date: 2009-03-01

More about this publication?

• Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.
  
  The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.
  
  Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.
  
  The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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