No guidelines exist to help physicians determine whether the functional and healthrelated quality of life (HRQoL) changes observed following treatment of patinets with pulmonary arterial hypertension (PAH) represent important benefits. Tehse analyses were undertaken to help defnie a minimally important difference (MID) in exercise capacity, measured by the 6minute walk dsitance (6MWD), and HRQoL, measured by the Short From36 (SF36) questionnaire in patients with PAH. ...