Patients with active gastrointestinal bleeding can be included. 5ml of SerasealTM/Fastact (Wortham Laboratories, Chattanooga, USA), a CE-certified medical product for in human intraoperative use as hemostatic agent, is topically applied via catheters to the bleeding site. In group A, Seraseal is applied as initial method for hemostasis. In group B, Seraseal is applied after an initial failure of the institutional standard method. Homeostatic success is determined by 5 min without bleeding at gastrointestinal site. after application of Seraseal.