<prompt> The sengstaken tube must be maintain a pressure of ___ to stop bleeding from varices20mmHg25mmHg35mmHg45mmHg  <response>: If bleeding doesnt stop promptly, the gastric balloon may be inflated to atleast a volume of 300ml, or the esophageal balloon may be inflated to a pressure of 40mmHg Ref: Sabiston 20th edition Pgno : 1438 