OXiris for Abdominal SEptic Shock (OASES Study)

The subjects will be accepted CRRT using a filter for 72 hours. The subjects will be continued to CRRT or not after 72 hours (the first session of treatment) according to clinical situation by clinician decision. CRRT prescription: 1 Blood purification access: Central vein indwelling double lumen catheter (diameter 11F-13.5F) can be placed in femoral vein, internal jugular vein and subclavian vein; 2.Anti-coagulation prescription: Anticoagulant is used according clinical situation by clinician decision (such as heparin, sodium citrate, and so on); 3. Modality of CRRT: CVVH: blood flow 150-200ml/min; replacement fluid flow 30-35ml/kg/h (100% post-dilution).