Acute Upper Gastrointestinal Bleeding — Timing of Endoscopy in Cirrhotic Patients With Acute Variceal Bleeding
Citation(s)
Bai Z, Wang R, Cheng G, Ma D, Ibrahim M, Chawla S, Qi X Outcomes of early versus delayed endoscopy in cirrhotic patients with acute variceal bleeding: a systematic review with meta-analysis. Eur J Gastroenterol Hepatol. 2021 Dec 1;33(1S Suppl 1):e868-e876. doi: 10.1097/MEG.0000000000002282.
Li Y, Li H, Zhu Q, Tsochatzis E, Wang R, Guo X, Qi X Effect of acute upper gastrointestinal bleeding manifestations at admission on the in-hospital outcomes of liver cirrhosis: hematemesis versus melena without hematemesis. Eur J Gastroenterol Hepatol. 2019 Nov;31(11):1334-1341. doi: 10.1097/MEG.0000000000001524.
Peng Y, Qi X, Dai J, Li H, Guo X Child-Pugh versus MELD score for predicting the in-hospital mortality of acute upper gastrointestinal bleeding in liver cirrhosis. Int J Clin Exp Med. 2015 Jan 15;8(1):751-7. eCollection 2015.
Peng Y, Qi X, Guo X Child-Pugh Versus MELD Score for the Assessment of Prognosis in Liver Cirrhosis: A Systematic Review and Meta-Analysis of Observational Studies. Medicine (Baltimore). 2016 Feb;95(8):e2877. doi: 10.1097/MD.0000000000002877.
Timing of Endoscopy in Cirrhotic Patients With Acute Variceal Bleeding
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.
