CytoSorb SAH Trial

Study phase 1: patients (not randomized) will be allocated to the treatment group and compared to an already existing retrospective control group. The measurements and procedures are otherwise the same as in phase 2: Patients are randomized into a treatment group and a control group. In the treatment group the study intervention consists of the installation of a central venous line, connected to a device for hemoperfusion and removal of IL-6 using a CytoSorb Adsorber. The overall objective is to evaluate efficacy, IL-6 levels will be measured daily in blood plasma as well as in cerebrospinal fluid between day 1 up to day 14 (routine procedure). Plasma and cerebrospinal fluid levels of IL-6 are evaluated using the routine samples. Furthermore, IL-6 will also be measured right after Cytosorb and the filtration to evaluate the amount of IL-6 that is actually removed by the filter (study-specific). Only post-filter blood samples are taken for study purposes. Two post-filter blood samples (10-20ml totally) are taken for study purposes: first sample one hour after installation of CytoSorb and the second sample: 24 hours after installation. Patient in the control group have standard of care treatment. The usual standard of care for the management of aneurysmal subarachnoid haemorrhage will be performed during the entire treatment period in both groups.