title: Evidence of active regulation of cerebral venous tone in individuals undergoing embolization of brain arteriovenous malformations.
abstract: Cerebral venous drainage is generally believed to be regulated primarily by hydrodynamic forces. To gain further insight into the regulation of this process, we investigated the response of blood flow velocity and cross-sectional area (CSA) of the internal jugular veins (IJVs) to local hemodynamic shifts. All procedures and assessments were performed on patients (n = 30) undergoing embolization of brain arteriovenous malformations (AVMs). The procedure efficiency was verified by the postembolization reduction in time-averaged maximum blood flow velocities, as well as the elevation of pulsatility index and resistance index in the arterial feeders. In cerebral veins, the dominant IJV pressure remained unchanged during the procedure. At the same time, AVM embolization caused a significant reduction in maximal CSA (84 ± 7.6 to 68 ± 7.7 mm(2), P < 0.05) and minimal CSA (68 ± 7.0 to 51 ± 7.0 mm(2), P < 0.01) of the IJV located ipsilateral to the AVM, while the maximal linear blood flow velocity in the IJV remained unchanged (71 ± 4.9 and 85 ± 8.4 cm/s, P = 0.098). Consistent with previously published studies, the data obtained provide further evidence of active regulation of the venous outflow, probably mediated by certain neurogenic and/or endothelium-dependent mechanisms.
authors.affiliation: Division of Vascular Surgery, A. L. Polenov Research Institute of Neurosurgery, St. Petersburg, Russian Federation;
authors.forename: Alexey Y
authors.initials: AY
authors.lastname: Ivanov
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Petrov
authors.forename: Elena A
authors.initials: EA
authors.lastname: Vershinina
authors.forename: Michael M
authors.initials: MM
authors.lastname: Galagudza
authors.forename: Timur D
authors.initials: TD
authors.lastname: Vlasov
mesh_terms: D000328:Adult; D001158:Arteries / Q000473:pathology; D001783:Blood Flow Velocity / Q000502:physiology; D001921:Brain / Q000098:blood supply*; D002550:Cerebral Veins / Q000473:pathology*; D002560:Cerebrovascular Circulation / Q000502:physiology; D004621:Embolization, Therapeutic; D004727:Endothelium / Q000473:pathology; D005260:Female; D006439:Hemodynamics; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000473:pathology* / Q000628:therapy*; D007601:Jugular Veins / Q000473:pathology; D008297:Male
keywords: arteriovenous malformations; brain; cross-sectional area; internal jugular veins; venous tone