Pain — Pupil Dilation and Analgesia Nociception Index
Citation(s)
Chapman CR, Oka S, Bradshaw DH, Jacobson RC, Donaldson GW Phasic pupil dilation response to noxious stimulation in normal volunteers: relationship to brain evoked potentials and pain report. Psychophysiology. 1999 Jan;36(1):44-52.
Heart rate variability Standards of measurement, physiological interpretation, and clinical use. Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology. Eur Heart J. 1996 Mar;17(3):354-81.
Koenig J, Jarczok MN, Ellis RJ, Hillecke TK, Thayer JF Heart rate variability and experimentally induced pain in healthy adults: a systematic review. Eur J Pain. 2014 Mar;18(3):301-14. doi: 10.1002/j.1532-2149.2013.00379.x. Epub 2013 Aug 6. Review.
Do Pupil Dilation and Analgesia Nociception Index Reflect Pain: a Pilot Study in Healthy, Conscious Volunteers
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.
