Inhaled Imatinib Pulmonary Arterial Hypertension Clinical Trial - Follow Up Long Term Extension (IMPAHCT-FUL)

IMPAHCT-FUL: Inhaled Imatinib Pulmonary Arterial Hypertension Clinical Trial - Follow Up Long Term Extension (LTE) Trial is a follow up study to establish the long-term safety of AV-101. The long-term effects of AV-101 on efficacy measures will also be assessed. Subjects who successfully complete the 24-week placebo-controlled parent trial (AV-101-002) will be offered the opportunity to continue into this LTE study. Subjects who enroll in the study will receive one of three active AV-101 doses until such time as the optimal dose has been selected in the parent study.