<prompt> The Sengstaken tube must maintain a pressure of ... to stop bleeding from varices:20 mm Hg25 mm Hg35 mm Hg45 mm Hg  <response>: Sengstaken tube - have 2 balloon 1Gastric balloon 2Esophageal balloon It is triple lumen; double ballooned tube. It is used mainly during transpoation of patient. Total amount of air inseed in gastric balloon 50 250 ml min air 300 ml Maximum pressure exeed by esophageal balloon 35-40 mm of Hg Every 12 hrs the esophageal balloon has to be deflated to prevent Ischemia necrosis of the esophagus. 