title: Delayed cerebral ischemia and spreading depolarization in absence of angiographic vasospasm after subarachnoid hemorrhage.
abstract: It has been hypothesized that vasospasm is the prime mechanism of delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage (aSAH). Recently, it was found that clusters of spreading depolarizations (SDs) are associated with DCI. Surgical placement of nicardipine prolonged-release implants (NPRIs) was shown to strongly attenuate vasospasm. In the present study, we tested whether SDs and DCI are abolished when vasospasm is reduced or abolished by NPRIs. After aneurysm clipping, 10 NPRIs were placed next to the proximal intracranial vessels. The SDs were recorded using a subdural electrode strip. Proximal vasospasm was assessed by digital subtraction angiography (DSA). 534 SDs were recorded in 10 of 13 patients (77%). Digital subtraction angiography revealed no vasospasm in 8 of 13 patients (62%) and only mild or moderate vasospasm in the remaining. Five patients developed DCI associated with clusters of SD despite the absence of angiographic vasospasm in three of those patients. The number of SDs correlated significantly with the development of DCI. This may explain why reduction of angiographic vasospasm alone has not been sufficient to improve outcome in some clinical studies.
authors.affiliation: Department of Neurosurgery, Charité-Universitätsmedizin Berlin, Berlin, Germany. johannes.woitzik@charite.de
authors.forename: Johannes
authors.initials: J
authors.lastname: Woitzik
authors.forename: Jens P
authors.initials: JP
authors.lastname: Dreier
authors.forename: Nils
authors.initials: N
authors.lastname: Hecht
authors.forename: Ingo
authors.initials: I
authors.lastname: Fiss
authors.forename: Nora
authors.initials: N
authors.lastname: Sandow
authors.forename: Sebastian
authors.initials: S
authors.lastname: Major
authors.forename: Maren
authors.initials: M
authors.lastname: Winkler
authors.forename: Yuliya A
authors.initials: YA
authors.lastname: Dahlem
authors.forename: Jerome
authors.initials: J
authors.lastname: Manville
authors.forename: Michael
authors.initials: M
authors.lastname: Diepers
authors.forename: Elke
authors.initials: E
authors.lastname: Muench
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Kasuya
authors.forename: Peter
authors.initials: P
authors.lastname: Schmiedek
authors.forename: Peter
authors.initials: P
authors.lastname: Vajkoczy
mesh_terms: D000328:Adult; D000368:Aged; D015901:Angiography, Digital Subtraction; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D001921:Brain / Q000098:blood supply / Q000000981:diagnostic imaging / Q000187:drug effects; D002545:Brain Ischemia / Q000209:etiology* / Q000517:prevention & control*; D013181:Cortical Spreading Depression / Q000187:drug effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009529:Nicardipine / Q000008:administration & dosage / Q000627:therapeutic use*; D011446:Prospective Studies; D019736:Prostheses and Implants; D013345:Subarachnoid Hemorrhage / Q000150:complications*; D020301:Vasospasm, Intracranial / Q000150:complications* / Q000000981:diagnostic imaging / Q000188:drug therapy*
chemical_list: D000959:Antihypertensive Agents; D009529:Nicardipine