Overview Efficacy Study of Cardizem in Pulmonary Arterial Hypertension Status: Withdrawn Trial end date: 2014-09-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine if cardizem is effective in the treatment of nitric oxide non-responder pulmonary arterial hypertension. Phase: N/A Details Lead Sponsor: University of South FloridaTreatments: Calcium Channel BlockersDiltiazem