Bashandy GM, Abbas DN Pectoral nerves I and II blocks in multimodal analgesia for breast cancer surgery: a randomized clinical trial. Reg Anesth Pain Med. 2015 Jan-Feb;40(1):68-74. doi: 10.1097/AAP.0000000000000163.
Blanco R, Parras T, McDonnell JG, Prats-Galino A Serratus plane block: a novel ultrasound-guided thoracic wall nerve block. Anaesthesia. 2013 Nov;68(11):1107-13. doi: 10.1111/anae.12344. Epub 2013 Aug 7.
Fletcher D, Martinez V Opioid-induced hyperalgesia in patients after surgery: a systematic review and a meta-analysis. Br J Anaesth. 2014 Jun;112(6):991-1004. doi: 10.1093/bja/aeu137. Review.
Fujii Y Management of postoperative nausea and vomiting in women scheduled for breast cancer surgery. J Anesth. 2011 Dec;25(6):917-22. doi: 10.1007/s00540-011-1241-1. Epub 2011 Oct 1. Review. Retraction in: Hirota K. J Anesth. 2013 Apr;27(2):322.
Gärtner R, Jensen MB, Nielsen J, Ewertz M, Kroman N, Kehlet H Prevalence of and factors associated with persistent pain following breast cancer surgery. JAMA. 2009 Nov 11;302(18):1985-92. doi: 10.1001/jama.2009.1568. Erratum in: JAMA. 2012 Nov 21;308(19):1973.
Power I An update on analgesics. Br J Anaesth. 2011 Jul;107(1):19-24. doi: 10.1093/bja/aer126. Epub 2011 May 30. Review.
Schnabel A, Reichl SU, Kranke P, Pogatzki-Zahn EM, Zahn PK Efficacy and safety of paravertebral blocks in breast surgery: a meta-analysis of randomized controlled trials. Br J Anaesth. 2010 Dec;105(6):842-52. doi: 10.1093/bja/aeq265. Epub 2010 Oct 14. Review. Erratum in: Br J Anaesth. 2013 Sep;111(3):522.
Shin SW, Cho AR, Lee HJ, Kim HJ, Byeon GJ, Yoon JW, Kim KH, Kwon JY Maintenance anaesthetics during remifentanil-based anaesthesia might affect postoperative pain control after breast cancer surgery. Br J Anaesth. 2010 Nov;105(5):661-7. doi: 10.1093/bja/aeq257. Epub 2010 Sep 28.
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.