- Comparison of AP complications: Respiratory complications: pneumonia; ARDS; circulatory complications; Complications kidney - urinary; multi-organ failure syndrome; AP intra-abdominal lesions: pseudocysts, pancreatic abscess,... 2.2.3.3 Undesirable effects of PEX Technical errors: coagulation filter, rupture membrane, occlusion catheter, fracture catheter, stamping catheter.