Effects of oral sildenafil on exercise capacity in children with pulmonary arterial hypertension: a randomised trial.

Previously published results showed a trend towards improvement in the primary endpoint of percent change in peak oxygen consumption (VO 2 ) for the combined sildenafil dose groups against placebo. 5 6 The 6 min walk (6 MW) test is used to evaluate the efficacy of therapies for PAH and has been shown to correlate with survival. 7 8 One limit

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