 - Had a ventilation-perfusion VQ lung scan, spiralhelicalelectron beam computed tomography CT, or pulmonary angiogram prior to Day 1 that shows no evidence of thromboembolic disease i.e., should note normal or low probability for pulmonary embolism. If VQ scan was abnormal i.e., results other than normal or low probability, then a confirmatory CT or selective pulmonary angiography must exclude chronic thromboembolic pulmonary hypertension; 