Canty DJ, Royse CF, Kilpatrick D, Bowyer A, Royse AG The impact on cardiac diagnosis and mortality of focused transthoracic echocardiography in hip fracture surgery patients with increased risk of cardiac disease: a retrospective cohort study. Anaesthesia. 2012 Nov;67(11):1202-9. doi: 10.1111/j.1365-2044.2012.07300.x. Epub 2012 Sep 5.
Canty DJ, Royse CF, Kilpatrick D, Williams DL, Royse AG The impact of pre-operative focused transthoracic echocardiography in emergency non-cardiac surgery patients with known or risk of cardiac disease. Anaesthesia. 2012 Jul;67(7):714-20. doi: 10.1111/j.1365-2044.2012.07118.x. Epub 2012 Mar 27.
Heiberg J, El-Ansary D, Canty DJ, Royse AG, Royse CF Focused echocardiography: a systematic review of diagnostic and clinical decision-making in anaesthesia and critical care. Anaesthesia. 2016 Sep;71(9):1091-100. doi: 10.1111/anae.13525. Epub 2016 Jun 27. Review.
Perioperative Point-of-Care Ultrasound: A Randomized Controlled 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.
