Baril DT, Ghosh K, Rosen AB Trends in the incidence, treatment, and outcomes of acute lower extremity ischemia in the United States Medicare population. J Vasc Surg. 2014 Sep;60(3):669-77.e2. doi: 10.1016/j.jvs.2014.03.244. Epub 2014 Apr 24.
Chowdhury MM, McLain AD, Twine CP Angioplasty versus bare metal stenting for superficial femoral artery lesions. Cochrane Database Syst Rev. 2014 Jun 24;(6):CD006767. doi: 10.1002/14651858.CD006767.pub3. Review.
Earnshaw JJ, Whitman B, Foy C National Audit of Thrombolysis for Acute Leg Ischemia (NATALI): clinical factors associated with early outcome. J Vasc Surg. 2004 May;39(5):1018-25.
Heinze G, Wallisch C, Dunkler D Variable selection - A review and recommendations for the practicing statistician. Biom J. 2018 May;60(3):431-449. doi: 10.1002/bimj.201700067. Epub 2018 Jan 2. Review.
Howard DP, Banerjee A, Fairhead JF, Hands L, Silver LE, Rothwell PM; Oxford Vascular Study Population-Based Study of Incidence, Risk Factors, Outcome, and Prognosis of Ischemic Peripheral Arterial Events: Implications for Prevention. Circulation. 2015 Nov 10;132(19):1805-15. doi: 10.1161/CIRCULATIONAHA.115.016424. Epub 2015 Sep 8. Erratum in: Circulation. 2015 Nov 10;132(19):e234.
Katsanos K, Spiliopoulos S, Kitrou P, Krokidis M, Karnabatidis D Risk of Death Following Application of Paclitaxel-Coated Balloons and Stents in the Femoropopliteal Artery of the Leg: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Am Heart Assoc. 2018 Dec 18;7(24):e011245. doi: 10.1161/JAHA.118.011245.
Oakes D, Feng C Combining stratified and unstratified log-rank tests in paired survival data. Stat Med. 2010 Jul 20;29(16):1735-45. doi: 10.1002/sim.3921.
Parzen M, Lipsitz SR A global goodness-of-fit statistic for Cox regression models. Biometrics. 1999 Jun;55(2):580-4.
Royston P, Parmar MK Restricted mean survival time: an alternative to the hazard ratio for the design and analysis of randomized trials with a time-to-event outcome. BMC Med Res Methodol. 2013 Dec 7;13:152. doi: 10.1186/1471-2288-13-152.
Schillinger M, Minar E Past, present and future of femoropopliteal stenting. J Endovasc Ther. 2009 Feb;16 Suppl 1:I147-52. doi: 10.1583/1545-1550-16.16.I-147. Review.
Vascular Implant Surveillance and Interventional Outcomes Network and the Vascular Quality Initiative Paclitaxel Safety Analysis
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.
