What is the function of band ligation in the treatment of esophageal varices?

Band ligation serves a specific and crucial role in the management of esophageal varices, which are dilated veins that can develop in the esophagus as a result of increased pressure in the portal venous system, commonly associated with liver cirrhosis. The primary purpose of band ligation is to control bleeding by occluding the varices.

During this procedure, rubber bands are placed around the base of the varices. This constriction effectively cuts off the blood flow to the area, leading to thrombosis (clot formation) within the varix. Over time, the varices will shrink and scar tissue will form, thus reducing the risk of further bleeding. The success of band ligation in preventing serious complications, such as hemorrhagic episodes, highlights its importance in the therapeutic approach to esophageal varices.

Other options do not pertain to the action or purpose of band ligation. They relate to different aspects of gastrointestinal physiology and management that are not directly involved in the treatment of varices.