Perioperative Complication — Preoperative Evaluation on Perioperative Complications
Citation(s)
Beckerleg W, Kobewka D, Wijeysundera DN, Sood MM, McIsaac DI Association of Preoperative Medical Consultation With Reduction in Adverse Postoperative Outcomes and Use of Processes of Care Among Residents of Ontario, Canada. JAMA Intern Med. 2023 May 1;183(5):470-478. doi: 10.1001/jamainternmed.2023.0325.
Colla CH, Morden NE, Sequist TD, Schpero WL, Rosenthal MB Choosing wisely: prevalence and correlates of low-value health care services in the United States. J Gen Intern Med. 2015 Feb;30(2):221-8. doi: 10.1007/s11606-014-3070-z. Epub 2014 Nov 6. Erratum In: J Gen Intern Med. 2016 Apr;31(4):450.
Rose J, Weiser TG, Hider P, Wilson L, Gruen RL, Bickler SW Estimated need for surgery worldwide based on prevalence of diseases: a modelling strategy for the WHO Global Health Estimate. Lancet Glob Health. 2015 Apr 27;3 Suppl 2(Suppl 2):S13-20. doi: 10.1016/S2214-109X(15)70087-2.
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.
