 - Have evidence of persistent elevation of pulmonary artery systolic pressure on Doppler echocardiography TR jet velocity of 2.5 to 2.9 ms or estimated pulmonary artery systolic pressure above the upper limit of reference adjusted ranges and up to 45 mm Hg, but no evidence of moderate or severe diastolic dysfunction on tissue Doppler echocardiography. Mild PHT must be confirmed on repeat evaluation, at least 3 months later 