Gandhi AV, Mosser EA, Oikonomou G, Prober DA Melatonin is required for the circadian regulation of sleep. Neuron. 2015 Mar 18;85(6):1193-9. doi: 10.1016/j.neuron.2015.02.016. Epub 2015 Mar 5.
Huang H, Jiang L, Shen L, Zhang G, Zhu B, Cheng J, Xi X Impact of oral melatonin on critically ill adult patients with ICU sleep deprivation: study protocol for a randomized controlled trial. Trials. 2014 Aug 18;15:327. doi: 10.1186/1745-6215-15-327.
Jones CR, Huang AL, Ptacek LJ, Fu YH Genetic basis of human circadian rhythm disorders. Exp Neurol. 2013 May;243:28-33. doi: 10.1016/j.expneurol.2012.07.012. Epub 2012 Jul 28.
Knauert MP, Malik V, Kamdar BB Sleep and sleep disordered breathing in hospitalized patients. Semin Respir Crit Care Med. 2014 Oct;35(5):582-92. doi: 10.1055/s-0034-1390080. Epub 2014 Oct 29.
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.
