Ellett ML, Cohen MD, Perkins SM, Croffie JM, Lane KA, Austin JK Comparing methods of determining insertion length for placing gastric tubes in children 1 month to 17 years of age. J Spec Pediatr Nurs. 2012 Jan;17(1):19-32. doi: 10.1111/j.1744-6155.2011.0
Malta MA, Carvalho-Junior AF, Andreollo NA, Freitas MI [Anthropometric measures for the introduction of the nasogastric tube for enteral nutrition employing the esophagogastroduodenoscopy]. Arq Bras Cir Dig. 2013 Jun;26(2):107-11. doi: 10.1590/s0102-6720
Santos SC, Woith W, Freitas MI, Zeferino EB Methods to determine the internal length of nasogastric feeding tubes: An integrative review. Int J Nurs Stud. 2016 Sep;61:95-103. doi: 10.1016/j.ijnurstu.2016.06.004. Epub 2016 Jun 15.
Taylor SJ, Allan K, McWilliam H, Toher D Nasogastric tube depth: the 'NEX' guideline is incorrect. Br J Nurs. 2014 Jun 26-Jul 9;23(12):641-4. doi: 10.12968/bjon.2014.23.12.641.
Taylor SJ Methods of Estimating Nasogastric Tube Length: All, Including "NEX," Are Unsafe. Nutr Clin Pract. 2020 Oct;35(5):864-870. doi: 10.1002/ncp.10497. Epub 2020 May 14.
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.
