title: Comparison between indocyanine green angiography and fluorescein angiography in normal cats.
abstract: OBJECTIVE
  To study a new approach to indocyanine green (ICG) angiography for contrasting the ocular fundus in cats.
  
  
  METHODS
  Six healthy laboratory cats.
  
  
  METHODS
  Fluorescein (FLUO) and ICG angiography were performed using an infrared-sensitive charged coupled device-equipped fundus camera on sedated cats.
  
  
  RESULTS
  At 12.3 ± 3.4 s after ICG administration, the choroidal arteries could be seen extending radially from the optic disk. The choroidal veins became apparent at 16.2 ± 4.1 s alongside the choroidal arteries. Gradual fading of the choroidal vessels began 5.8 ± 1.5 min postdye administration and diffuse fluorescence of the fundus appeared. Diffuse fluorescence of the optic disk faded at about 18.8 ± 2.9 min. Mean arterial blood pressure at 1 and 3 min after ICG administration showed no significant change when compared to pre-administration (P > 0.05). However, 5 min (P = 0.054) and 10 min (P < 0.05) postadministration, a significant drop in blood pressure occurred. The time lapse between FLUO administration and its appearance in the ocular fundus was 15.7 ± 3.8 s. Retinal veins became apparent at 22.0 ± 3.6 s alongside retinal arteries. At 31.2 ± 4.1 s, full venous fluorescence was visualized throughout the entire fundus.
  
  
  CONCLUSIONS
  While FLUO angiography shows only the retinal vessels, ICG angiography enabled visualization of the choroidal vasculature. ICG angiography provides clear resolution while remaining reliable and simple; thus, a combination of ICG and FLUO angiography shows promise as a diagnostic aid for clinical evaluation of various chorioretinal diseases in cats.
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Miri
authors.initials: M
authors.lastname: Hayashi
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Seiya
authors.initials: S
authors.lastname: Maehara
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Ito
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Kazuto
authors.initials: K
authors.lastname: Yamashita
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Kubo
authors.affiliation: Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakade
mesh_terms: D000818:Animals; D062186:Arterial Pressure; D002371:Cat Diseases / Q000175:diagnosis; D002415:Cats; D002829:Choroid / Q000098:blood supply*; D005128:Eye Diseases / Q000175:diagnosis / Q000662:veterinary; D005451:Fluorescein Angiography / Q000662:veterinary*; D005654:Fundus Oculi; D007208:Indocyanine Green; D009898:Optic Disk / Q000033:anatomy & histology; D012171:Retinal Vessels / Q000033:anatomy & histology
chemical_list: D007208:Indocyanine Green
keywords: cat; choroid; fluorescein; fundus; indocyanine green; ocular angiography