Haemorrhage

The goal of this single-center, non-controlled, non-randomized exploratory clinical trial is To develop and validate a clinical-biological score (VISCOTHEM score) incorporating viscoelastometric tests parameters; based on an association study, and to establish a threshold that enables the prediction of the immediate risk of bleeding in haematology patients with severe thrombocytopenia (\<20 G/L); with a view to selecting a population with a residual risk of bleeding of zero (NPV ≥ 95%, to achieve a residual probability of bleeding \< 5%). The score may incorporate variables identified in the literature as having a plausible causal relationship with the occurrence of bleeding (14,15), as well as viscoelastometric tests parameters, conventional haemostasis parameters and relevant clinical parameters. . Participants will undergo an additional blood sample to standard care. The total volume of blood drawn will be 21.1 mL. The following analyses will be performed: Quantra®, Rotem®, blood count, platelets, immature platelet count, plasma prothrombin time, activated partial thromboplastin time, International Normalized Ratio, fibrinogen, urea, creatinin, albumin.

Endoscopic resection of pedunculated polyps mainly focuses on how to prevent bleeding, and also needs to pay attention to the convenience of resection and the integrity of resection, which means that different endoscopic resection strategies should be adopted for pedunculated polyps with different pedicle sizes. The head larger than 20mm or pedicle larger than 5mm are defined as large pedunculated polyps, which are at greater risk of bleeding. Current guidelines recommend hot removal by snare following preoperative saline injection, ligation of the pedicle with a nylon ring or metal clip, depending on the size of the polyp head and pedicle. However, the use of snares and metal clamps does not appear to reduce delayed postoperative bleeding, and the technical requirements of nylon ligation are relatively high. Recent studies have found that Underwater endoscopic mucosal resection (UEMR) is also safe and effective for the treatment of large and medium colorectal sessile polyps. Therefore, it is still necessary to further explore new safe and effective endoscopic resection strategies and techniques.