Liu Y, Gao YK, Yao L, Li L Modified B-ultrasound method for measurement of antral section only to assess gastric function and guide enteral nutrition in critically ill patients. World J Gastroenterol. 2017 Jul 28;23(28):5229-5236. doi: 10.3748/wjg.v23.i28.5229.
Sharma V, Gudivada D, Gueret R, Bailitz J Ultrasound-Assessed Gastric Antral Area Correlates With Aspirated Tube Feed Volume in Enterally Fed Critically Ill Patients. Nutr Clin Pract. 2017 Apr;32(2):206-211. doi: 10.1177/0884533616681530. Epub 2016 Dec 16.
Van de Putte P, Perlas A Ultrasound assessment of gastric content and volume. Br J Anaesth. 2014 Jul;113(1):12-22. doi: 10.1093/bja/aeu151. Epub 2014 Jun 3. Review.
Warren M, McCarthy MS, Roberts PR Practical Application of the Revised Guidelines for the Provision and Assessment of Nutrition Support Therapy in the Adult Critically Ill Patient: A Case Study Approach. Nutr Clin Pract. 2016 Jun;31(3):334-41. doi: 10.1177/0884533616640451. Epub 2016 Apr 12.
The Effect of Gastric Antrum Ultrasonography on Early Stage of Enteral Nutrition in Critically Ill Patients.
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.
