title: Intraoperative Electroretinograms before and after Core Vitrectomy.
abstract: OBJECTIVE
  To evaluate retinal function by intraoperative electroretinograms (ERGs) before and after core vitrectomy.
  
  
  METHODS
  Retrospective consecutive case series.
  
  
  METHODS
  Full-field photopic ERGs were recorded prior to the beginning and just after core vitrectomy using a sterilized contact lens electrode in 20 eyes that underwent non-complicated vitreous surgery. A light-emitted diode was embedded into the contact lens, and a stimulus of 150 ms on and 350 ms off at 2 Hz was delivered. The amplitudes and latencies of the a-, b-, and d-waves, photopic negative response (PhNR), and oscillatory potentials (OPs) were analyzed. The intraocular temperature at the mid-vitreous was measured at the beginning and just after the surgery with a thermoprobe.
  
  
  RESULTS
  The intraocular temperature was 33.2 ± 1.3°C before and 29.4 ± 1.7°C after the vitrectomy. The amplitudes of the PhNR and OPs were significantly smaller after surgery, and the latencies of all components were prolonged after the surgery. These changes were not significantly correlated with the changes of the temperature.
  
  
  CONCLUSIONS
  Retinal function is reduced just after core vitrectomy in conjunction with significant temperature reduction. The differences in the degree of alterations of each ERG component suggests different sensitivity of each type of retinal neuron.
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
authors.forename: Kazuma
authors.initials: K
authors.lastname: Yagura
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
authors.forename: Kei
authors.initials: K
authors.lastname: Shinoda
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.|Matsumoto Eye Clinic, Takagaki, Awa-cho, Awa-shi, Tokushima, Japan.
authors.forename: Soiti
authors.initials: S
authors.lastname: Matsumoto
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
authors.forename: Gaku
authors.initials: G
authors.lastname: Terauchi
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
authors.forename: Emiko
authors.initials: E
authors.lastname: Watanabe
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.|Matsumoto Eye Clinic, Takagaki, Awa-cho, Awa-shi, Tokushima, Japan.
authors.forename: Harue
authors.initials: H
authors.lastname: Matsumoto
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.|Akiyama Eye Clinic, Kita-ku, Tokyo, Japan.
authors.forename: Goichi
authors.initials: G
authors.lastname: Akiyama
authors.affiliation: Department of Ophthalmology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Mizota
authors.affiliation: Aichi Medical University, Yazakokarimata, Nagakute-shi, Aichi, Japan.
authors.forename: Yozo
authors.initials: Y
authors.lastname: Miyake
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001831:Body Temperature; D004596:Electroretinography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012160:Retina / Q000503:physiopathology* / Q000601:surgery*; D012189:Retrospective Studies; D014821:Vitrectomy / Q000379:methods