Lee HJ, Cho YJ, Gong HS, Rhee SH, Park HS, Baek GH The effect of buffered lidocaine in local anesthesia: a prospective, randomized, double-blind study. J Hand Surg Am. 2013 May;38(5):971-5. doi: 10.1016/j.jhsa.2013.02.016. Epub 2013 Apr 6.
Vasan A, Baker JA, Shelby RA, Soo MSC Impact of Sodium Bicarbonate-Buffered Lidocaine on Patient Pain During Image-Guided Breast Biopsy. J Am Coll Radiol. 2017 Sep;14(9):1194-1201. doi: 10.1016/j.jacr.2017.03.026. Epub 2017 May 17.
Welch MN, Czyz CN, Kalwerisky K, Holck DE, Mihora LD Double-blind, bilateral pain comparison with simultaneous injection of 2% lidocaine versus buffered 2% lidocaine for periocular anesthesia. Ophthalmology. 2012 Oct;119(10):2048-52. doi: 10.1016/j.ophth
Effect of Buffered Lidocaine With Epinephrine in Local Anesthesia During Subcutaneous Implantable Venous Access Devices Insertion: Double Blind Randomized Study.
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.
