title: [Electrophysiology in hypovitaminosis A].
abstract: Electroretinographic examinations performed according to the international standard were used in two patients with alimentary hypovitaminosis A. In one instance a mentally caused long-term deficiency of dietary vitamin A intake was involved, in the second instance a fistula from the proximal jejunum into the transverse colon. In both instances night blindness was reported. The initial vitamin A values were 1.0 and 0.6 micromol/l resp. and after substitution therapy they rose to 2 micromol/l. While the rod and maximal ERG responses improved gradually, the oscillation potentials remained pathological as regards amplitudes and latencies. We consider them therefore a sensitive indicator of the electric sensitivity of the retina also in other cases of confirmed or suspected vitamin A deficiency. The existence and orientation of our metabolic and gerontological clinic provides adequate opportunities for these investigations.
authors.affiliation: Ocní klinika FN LF UK, Hradec Králové.
authors.forename: J
authors.initials: J
authors.lastname: Svĕrák
authors.forename: R
authors.initials: R
authors.lastname: Jebavá
authors.forename: D
authors.initials: D
authors.lastname: Hejcmanová
authors.forename: J
authors.initials: J
authors.lastname: Peregrin
authors.forename: L
authors.initials: L
authors.lastname: Sobotka
mesh_terms: D004596:Electroretinography; D005260:Female; D006801:Humans; D008875:Middle Aged; D014786:Vision Disorders / Q000175:diagnosis / Q000209:etiology; D014802:Vitamin A Deficiency / Q000503:physiopathology* / Q000628:therapy
vernacular_title: Elektrofyziologie u hypovitaminózy A.