Cervical Spinal Cord Stimulation in Patients With Cerebral Vasospasm After Subarachnoid Haemorrhage: VasoStim Study

Inclusion Criteria: * Fisher 3 grade subarachnoid hemorrhage at presentation * Secured aneurysm by clipping or coiling * Is 18-75 years of age at the time of enrollment * Cerebral vasospasm: * Cerebral angiography o Narrowing of vessel lumen \> 66% * Transcranial Doppler ultrasound * Mean flow velocity \> 150 cm/s or * Lindegaard Index \> 3 or * increase \> 50 cm/s within 24 hours * Intracranial CT angiography o Narrowing of vessel lumen \> 66% * Intracranial CT perfusion o Time To Drain (TTD) \> 4.7 seconds * Is willing and capable of providing informed consent or existence of the presumed will of the patient by a relative or a legal representative * Written confirmation by a study independent physician to guarantee patient interest * Is willing and capable of complying with the study related requirements, procedures, and visits * No findings on spinal imaging preventing SCS lead implantation * Negative pregnancy test * No breast feeding Exclusion Criteria: * Untreated ruptured aneurysm * Cerebral infarction in the territory of the spastic arteries or massive disseminated infarction * Signs of cerebral herniation * Uncontrollable intracranial pressure * Infection * Coagulation disorder * Is participating in another interventional trial * Circulatory instability * Severe congestive heart failure * Patients with an elevated risk of bleeding * Known allergy to implanted materials (Silicon, Titanium)