A Non-Interventional, Patient Registry For The Collection Of Pre-Defined Safety Data In Patients Prescribed Thelin

Please note that this is a non-interventional study and no drug is actually given as an intervention. Instead, patients prescribed THELIN are being followed under real world circumstances. However at the request of the QA group at CT.gov, we were instructed to add sitaxentan sodium as the intervention type, regardless of the fact that this is a non-interventional study.