Comparison of Endoscopic Injection of Conventional and Double Doses Cyanoacrylate for Gastric Variceal Hemorrhage

Although outcome of variceal hemorrhage has been improved in the last two decades, variceal hemorrhage is still the most serious complication of portal hypertension and chronic liver disease. Occurrence of gastric varices (GV) rupture is less often than esophageal varices (EV) but it is characteristic of higher rebleeding rate and mortality and represents an even tougher problem than EV hemorrhage. Facing these challenges, there is no consensus on the best treatment of GV hemorrhage and therefore it is mainly empirical. Endoscopic treatment is an alternative in the management of GVH. Injection sclerotherapy has been applied to arrest GV hemorrhage but it is associated with a high rebleeding rate (50\~90%) and thus is regarded as only a temporary hemostatic measure. The advantage of endoscopic variceal ligation for EV hemorrhage has been documented, however, endoscopic variceal ligation for GVH is not as promising because of its high rebleeding rate around 50%. Endoscopic injection of N-butyl-2-cyanoacrylate, a so-called "tissue glue", was more effective for GV hemorrhage than other sclerosants and endoscopic ligation, however, its rebleeding rate is still high around 30\~50%. The theoretical advantages of tissue glue derives from its unique ability to plug the varix lumen immediately. Each injection of tissue glue in conventional use was usually prepared by a mixture of 0.5 ml cyanoacrylate and 0.5 ml Lipiodol. Therefore, we hypothesized that double dose cyanoacrylate (1 ml cyanoacrylate mixed with 1 ml Lipiodal) may obliterate the varices in further distance and broader area and that may achieve more effective hemostatic results than conventional dose. Therefore we designed a randomized trial to test the hypothesis.