Objectives: This study investigated the long-term effects of bosentan, an oral endothelin ET(A)/ET(B) receptor antagonist, in patients with pulmonary arterial hypertension (PAH) exclusively related to connective tissue diseases (CTD).
Methods: A total of 53 patients with PAH related to connective tissue diseases (PAH-CTD) in World Health Organization (WHO) functional class III received bosentan 62.5 mg twice a day for 4 weeks and then 125 mg twice a day for 44 weeks in this open non-comparative study. Assessments at weeks 16 and 48 included WHO class, clinical worsening, quality of life (Short-Form Health Survey (SF-36) and health assessment questionnaire (HAQ) modified for scleroderma), and survival (week 48 only). Safety and tolerability were monitored throughout the study.
Results: At week 48, WHO class improved in 27% of patients (95% CI 16-42%) and worsened in 16% (95% CI 7-29%). Kaplan-Meier estimates were 68% (95% CI 55-82%) for absence of clinical worsening and 92% (95% CI 85-100%) for survival. Overall changes in quality of life were minimal. There were no unexpected side effects observed during the study.
Conclusions: In most patients, bosentan was associated with improvement or stability of clinical status. The 92% estimate for survival at 48 weeks is a significant achievement in this patient population.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2564804 | PMC |
| http://dx.doi.org/10.1136/ard.2007.079921 | DOI Listing |
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