title: Visual evoked cortical responses and electroretinograms following implantation of human fetal mesencephalon to the right caudate nucleus in Parkinson's disease.
abstract: Pattern electroretinograms and visual evoked cortical responses following flash and checkerboard pattern reversal stimulation were performed in 7 patients with advanced Parkinson's disease before and after implantation of human fetal ventral mesencephalon to the head of the right caudate nucleus. Six to nine months following surgery there was bilateral enhancement of flash-evoked response amplitudes. Electroretinogram measurements were unchanged. Individual increases in amplitude and decreases in latency were seen following pattern stimulation which were not statistically significant. A relationship between change in dyskinesia, and change in checkerboard pattern stimulation amplitude at 2.4 cycles per degree suggests that amplitude effects at this stimulus frequency are mediated via altered dopaminergic receptor status in the grafted hemisphere. This may be relevant to the mechanisms leading to generalised clinical improvements following this grafting technique.
authors.affiliation: Midland Centre for Neurosurgery and Neurology, Warley, West Midlands, U.K.
authors.forename: B
authors.initials: B
authors.lastname: Henderson
authors.forename: P A
authors.initials: PA
authors.lastname: Good
authors.forename: E R
authors.initials: ER
authors.lastname: Hitchcock
authors.forename: C G
authors.initials: CG
authors.lastname: Clough
authors.forename: R C
authors.initials: RC
authors.lastname: Hughes
authors.forename: B G
authors.initials: BG
authors.lastname: Kenny
mesh_terms: D016380:Brain Tissue Transplantation / Q000502:physiology*; D002421:Caudate Nucleus / Q000503:physiopathology*; D004596:Electroretinography; D005074:Evoked Potentials, Visual; D005260:Female; D016332:Fetal Tissue Transplantation / Q000502:physiology*; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use; D008297:Male; D008636:Mesencephalon / Q000637:transplantation*; D008875:Middle Aged; D010300:Parkinson Disease / Q000188:drug therapy / Q000503:physiopathology / Q000601:surgery*; D016042:Transplantation, Heterotopic
chemical_list: D007980:Levodopa