title: Recovery of spontaneous neuromagnetic activity after extracranial-intracranial bypass in a patient with middle cerebral artery occlusion.
abstract: METHODS
  Cerebral blood flow and neuromagnetic activity were measured using (123)I-iodoamphetamine-single photon emission computed tomography (IMP-SPECT) and magnetoencephalography (MEG), before and after extracranial-intracranial (EC-IC) bypass surgery in a 55-year-old woman with unilateral middle cerebral artery occlusion that occurred with intraventricular haemorrhage. Frequency analysis of slow waves measured on MEG was performed using an adaptive beam-former method.
  
  
  CONCLUSIONS
  Distribution of delta waves was observed pre-operatively corresponding to areas of cerebral hypo-perfusion as confirmed by IMP-SPECT but disappeared post-operatively with improvements in cerebral blood flow. Imaging of slow-wave distributions with MEG may represent a new technique for identifying cerebral ischaemia.
authors.affiliation: Department of Neurosurgery, Hokuto Hospital, Obihiro, Japan. s-sakamoto@med.osaka-cu.ac.jp
authors.forename: Shinichi
authors.initials: S
authors.lastname: Sakamoto
authors.forename: Wataru
authors.initials: W
authors.lastname: Ide
authors.forename: Ikuo
authors.initials: I
authors.lastname: Hashimoto
authors.forename: Hajime
authors.initials: H
authors.lastname: Kamada
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Tanaka
authors.forename: Kensuke
authors.initials: K
authors.lastname: Sekihara
mesh_terms: D001921:Brain / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000503:physiopathology; D002545:Brain Ischemia / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D002548:Cerebral Revascularization / Q000379:methods*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D020244:Infarction, Middle Cerebral Artery / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D007457:Iodine Radioisotopes; D015225:Magnetoencephalography / Q000379:methods; D008875:Middle Aged; D011237:Predictive Value of Tests; D020127:Recovery of Function / Q000502:physiology; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods
chemical_list: D007457:Iodine Radioisotopes