Background
Portal hypertension is defined as an increase in the blood pressure within a system of veins (a type of blood vessel) called the portal venous system, which drains blood from the gastrointestinal tract (gut) and spleen into the liver. Portal hypertension commonly accompanies advanced liver disease and often gives rise to life-threatening complications, including haemorrhage (bleeding) from oesophageal (gullet) and gastrointestinal varices (enlarged or swollen veins).
Following numerous randomised clinical trials (studies where people are randomly put into one of two or more treatment groups) demonstrating the effectiveness of medicines called non-selective beta-blockers and endoscopic variceal ligation (where an enlarged vein is tied off or ligated by a rubber band) in decreasing the incidence of variceal haemorrhage, treatment to prevent of variceal haemorrhage in adults (called primary prophylaxis) has become the established standard of care.
Study characteristics
We conducted a systematic review of randomised clinical trials to assess the benefits and harms of band ligation versus beta-blockers for prevention of oesophageal variceal bleeding in children with chronic liver disease or portal vein thrombosis (blockage or narrowing of the portal vein (the blood vessel that brings blood to the liver from the intestines) by a blood clot). We searched for studies to 26 December 2018.
Key results
We found no randomised clinical trials for inclusion in this systematic review. Accordingly, we lack study results from randomised clinical trials to conclude if band ligation versus beta-blocker may be beneficial or not in children with oesophageal varices. There is a need for well-designed trials that should include important clinical outcomes such as death, failure to control bleeding, and side effects.
Randomised clinical trials assessing the benefits or harms of band ligation versus beta-blockers for primary prophylaxis of oesophageal variceal bleeding in children with chronic liver disease or portal vein thrombosis are lacking. There is a need for well-designed, adequately powered randomised clinical trials to assess the benefits and harms of band ligation versus beta-blockers for primary prophylaxis of oesophageal variceal bleeding in children with chronic liver disease or portal vein thrombosis. Those randomised clinical trials should include patient-relevant clinical outcomes such as mortality, failure to control bleeding, and adverse events.
Portal hypertension commonly accompanies advanced liver disease and often gives rise to life-threatening complications, including haemorrhage from oesophageal and gastrointestinal varices. Variceal haemorrhage commonly occurs in children with chronic liver disease or portal vein obstruction. Prevention is therefore important. Following numerous randomised clinical trials demonstrating efficacy of non-selective beta-blockers and endoscopic variceal ligation in decreasing the incidence of variceal haemorrhage, primary prophylaxis of variceal haemorrhage in adults has become the established standard of care. Hence, band ligation and beta-blockers have been proposed to be used as primary prophylaxis of oesophageal variceal bleeding in children.
To determine the benefits and harms of band ligation compared with any type of beta-blocker for primary prophylaxis of oesophageal variceal bleeding in children with chronic liver disease or portal vein thrombosis.
We searched The Cochrane Hepato-Biliary Group Controlled Trials Register (February 2019), CENTRAL (December 2018), PubMed (December 2018), Embase Ovid (December 2018), LILACS (Bireme; January 2019), and Science Citation Index Expanded (Web of Science; December 2018). We scrutinised the reference lists of the retrieved publications and performed a manual search from the main paediatric gastroenterology and hepatology conferences (NASPGHAN and ESPGHAN) abstract books from 2009 to 2018. We searched ClinicalTrials.gov for ongoing clinical trials. There were no language or document type restrictions.
We planned to include randomised clinical trials irrespective of blinding, language, or publication status for assessment of benefits and harms. We planned to also include quasi-randomised and other observational studies retrieved with the searches for randomised clinical trials for report of harm.
We planned to summarise data from randomised clinical trials using standard Cochrane methodologies.
We found no randomised clinical trials assessing band ligation versus beta-blockers for primary prophylaxis of oesophageal variceal bleeding in children with chronic liver disease or portal vein thrombosis.