Behandling med bosentan var associeret med en reduktion i hastigheden af klinisk forværring defineret som en kombination af symptomatisk progression, hospitalsindlæggelse for PAH og død sammenlignet med placebo (proportional reduktion i risiko på 77%, 95% CI 20% – 94%, p = 0, 0114).
Treatment with bosentan was associated with a reduction in the rate of clinical worsening, defined as a composite of symptomatic progression, hospitalisation for PAH and death, compared with placebo (proportional risk reduction 77%, 95% CI 20%–94%, p = 0.0114).