Variation in Measurement of Pattern Electroretinogram (pERG)
- Author:
Shaznida Ghulam
;
Norhani Mohidin
;
Rokiah Omar
- Publication Type:Journal Article
- Keywords:
Pattern electroretinogram, anaesthetic, time variation, fixation target
- From:Malaysian Journal of Health Sciences
2012;10(2):31-36
- CountryMalaysia
- Language:English
-
Abstract:
Pattern electroretinogram (pERG) is a recording of retinal response to a phase reversing pattern stimulus. It gives
information on the integrity of the inner retina specifically the ganglion cells. The recording of pERG in a laboratory
is easily influenced by many factors hence standardization in a laboratory is required to ensure that pERG recorded is
repeatable and reproducible. The objective of this study was to determine the factors that could affect pERG recordings
at the Electrophysiology Laboratory, Optometry Program, Faculty of Health Sciences (FSK), Universiti Kebangsaan
Malaysia (UKM). This study involved forty-five subjects, aged between 20 and 25 years. They were divided into three
groups. The factors being investigated were effects of 1) Alcaine 0.5%, 2) diurnal variation and 3) different size and
shape of fixation target for pERG measurement (amplitude and implicit time). Paired t-test showed no significant
differences between the recording before and after instillation of Alcaine 0.5% for amplitude (p = 0.116) and implicit time
(p = 0.557). Measurements carried out in the morning and afternoon did not show significant differences for amplitude
(p = 0.864) and implicit time (p = 0.174). For different fixation targets, results also showed no significant difference for
amplitude (p = 0.125) and implicit time (p = 0.404). In conclusion, use of Alcaine 0.5%, different time of measurements
and different type of fixation targets do not influence pERG results at the Electrophysiology Laboratory, FSK, UKM. Results
of this study can be used for comparisons in research or in diagnosing diseases of the retina in the future
- Full text:W020150601501212959993.pdf
