Gall H, Hoeper MM, Richter MJ, Cacheris W, Hinzmann B, Mayer E An epidemiological analysis of the burden of chronic thromboembolic pulmonary hypertension in the USA, Europe and Japan. Eur Respir Rev. 2017 Mar 29;26(143):160121. doi: 10.1183/16000617.0121-2016. Print 2017 Mar 31.
Jenkins D, Madani M, Fadel E, D'Armini AM, Mayer E Pulmonary endarterectomy in the management of chronic thromboembolic pulmonary hypertension. Eur Respir Rev. 2017 Mar 15;26(143):160111. doi: 10.1183/16000617.0111-2016. Print 2017 Jan.
Lang IM, Pesavento R, Bonderman D, Yuan JX Risk factors and basic mechanisms of chronic thromboembolic pulmonary hypertension: a current understanding. Eur Respir J. 2013 Feb;41(2):462-8. doi: 10.1183/09031936.00049312. Epub 2012 Jun 14.
Riedel M, Stanek V, Widimsky J, Prerovsky I Longterm follow-up of patients with pulmonary thromboembolism. Late prognosis and evolution of hemodynamic and respiratory data. Chest. 1982 Feb;81(2):151-8. doi: 10.1378/chest.81.2.151.
Balloon Pulmonary anGiOplasty Versus Pulmonary Endarterectomy in Patients With Chronic ThromboEmbolic Pulmonary Hypertension: a Non-inferiority Randomized Trial
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
