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Open Access Research

Treatment satisfaction is associated with improved quality of life in patients treated with inhaled treprostinil for pulmonary arterial hypertension

Hubert Chen12*, Erika B Rosenzweig3, S Karl Gotzkowsky4, Carl Arneson4, Andrew C Nelsen4 and Robert C Bourge5

Author Affiliations

1 Department of Medicine, University of California San Francisco, 1 DNA Way, Mailstop 453A, South San Francisco, CA 94080, USA

2 Genentech, Inc, South San Francisco, CA, USA

3 Department of Pediatrics, Columbia University, New York, NY, USA

4 United Therapeutics, Corp, Research Triangle Park, NC, USA

5 University of Alabama at Birmingham, Birmingham, AL, USA

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Health and Quality of Life Outcomes 2013, 11:31  doi:10.1186/1477-7525-11-31

Published: 6 March 2013

Abstract

Background

Patient treatment satisfaction is likely to be a highly relevant outcome measure in pulmonary arterial hypertension (PAH), a condition for which the benefits of treatment must be weighed against frequent, undesirable side effects, inconvenience, and complications associated with therapy. In this study, we sought to evaluate the psychometric properties of a patient-reported treatment satisfaction measure and its relationship to quality of life (QoL) among patients transitioning from inhaled iloprost (iILO) to inhaled treprostinil (iTRE).

Methods

We studied treatment satisfaction among 66 subjects with PAH in a single-arm, open-label, multi-center trial of iTRE following transition from iILO. Treatment satisfaction was assessed using the Treatment Satisfaction Questionnaire for Medication (TSQM, version 1.4) administered to subjects immediately before and 12 weeks after transition of inhaled therapy. The TSQM is comprised of 4 domains: effectiveness, side effects, convenience, and global satisfaction. Scores range from 0 to 100 with higher scores indicating greater satisfaction. Six-minute walk distance (6MWD), functional class, adverse events, drug administration time, and PAH-specific QoL (CAMPHOR) were concurrently assessed.

Results

Domains of the TSQM demonstrated evidence of strong internal consistency at baseline and at 12 weeks (Cronbach α = 0.88-0.93). Transition from iILO to iTRE was associated with an improvement in 3 of 4 TSQM domains: effectiveness (+20 ± 21, p < 0.0001), side effects (0 ± 22, p = 0.97), convenience (+39 ± 26, p < 0.0001), and global satisfaction (+20 ± 24, p = 0.0005). Change in effectiveness scores correlated with change in 6MWD (r = 0.43, p = 0.0004) and side effects scores at 12 weeks correlated inversely with number of severity-weighted treatment-emergent adverse events (r = −0.44, p = 0.0002). In multiple regression models adjusted for baseline characteristics, changes in effectiveness and convenience satisfaction scores were significantly associated with improvement in PAH-specific QoL (p = 0.002 and p = 0.01).

Conclusions

The TSQM demonstrated acceptable performance characteristics in patients with PAH. Changes in treatment satisfaction resulting from transitioning from iILO to iTRE were associated with improvements in PAH-specific QoL.

Keywords:
Pulmonary arterial hypertension; Treatment satisfaction; Quality of life; Inhaled prostacyclin; Iloprost; Treprostinil