May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Photopic flash ERG B–wave and 30Hz flicker latency under general anaesthesia
Author Affiliations & Notes
  • M.C. Brown
    Clinical Engineering, Royal Liverpool Univ Hospital, Liverpool, United Kingdom
  • R.P. Hagan
    Clinical Engineering, Royal Liverpool Univ Hospital, Liverpool, United Kingdom
  • M.A. Thomas
    Clinical Engineering, Royal Liverpool Univ Hospital, Liverpool, United Kingdom
  • A.M. Mackay
    Clinical Engineering, Royal Liverpool Univ Hospital, Liverpool, United Kingdom
  • Footnotes
    Commercial Relationships  M.C. Brown, None; R.P. Hagan, None; M.A. Thomas, None; A.M. Mackay, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 824. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      M.C. Brown, R.P. Hagan, M.A. Thomas, A.M. Mackay; Photopic flash ERG B–wave and 30Hz flicker latency under general anaesthesia . Invest. Ophthalmol. Vis. Sci. 2004;45(13):824.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Abstract: : Purpose: To review photopic flash and 30Hz flicker latency results in children who have undergone ERG tests under general anaesthesia (UGA) and those who undertook the tests whilst awake. We have noticed that tests under general anaesthesia often have considerably increased latencies compared to awake tests. This study tests the validity of this observation and considers the reasons with regard to the stimulator and the anaesthetic. Methods:In our clinic, diagnostic ERG tests are performed on some children under general anaesthesia. ERG tests are performed awake using the LKC UTAS 2000 system with full–size Ganzfeld stimulator and lower lid skin electrodes or gold foil corneal electrodes. UGA these are performed with JET corneal electrodes and the LKC mini–Ganzfeld stimulator. Photopic flash latency was measured to the peak of the B–wave, and 30Hz latency was taken from the LKC flicker latency calculation. From existing diagnostic records: (i) 30Hz response latencies were compared for the UGA group with values from an independent group of awake subjects, (ii) photopic flash B–wave latency was compared in 4 children who had tests both UGA and awake. Also (iii) 8 adult volunteers had flash and flicker tests with skin electrodes to compare latencies using the full–size and the hand–held mini–Ganzfeld stimulator. Results:(i) Mean 30Hz latency for the UGA group (10 cases – OD only) was 33.2ms (SD 3.35), and for the awake group (70 cases) with skin electrodes 26.8ms (SD 2.46) (p<0.05). (ii) Of the four cases tested in both conditions: B–wave latency in ms 

(iii) The mode of stimulation had no systematic effect on the latencies Conclusions: Mean photopic flash and mean 30Hz ERG latencies were longer in our cases tested under general (inhalational) anaesthesia. The use of the full–size or hand held mini–Ganzfeld stimulator did not affect latency.

Keywords: electroretinography: clinical • electrophysiology: clinical • retina 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×