Full-field electroretinogram in autism spectrum disorder

被引:43
|
作者
Constable, Paul A. [1 ,2 ]
Gaigg, Sebastian B. [2 ]
Bowler, Dermot M. [2 ]
Jaegle, Herbert [3 ]
Thompson, Dorothy A. [4 ]
机构
[1] Flinders Univ S Australia, Dept Optometry & Vis Sci, GPO Box 2100, Adelaide, SA 5001, Australia
[2] City Univ London, Autism Res Grp, London EC1V 0HB, England
[3] Univ Clin, Dept Ophthalmol, Regensburg, Germany
[4] Great Ormond St Hosp Sick Children, Clin & Acad Dept Ophthalmol, Great Ormond St, London WC1N 3JH, England
关键词
Autism spectrum disorder; Electroretinogram; Naka-Rushton; ON pathway; 15-Hz scotopic flicker; METABOTROPIC GLUTAMATE RECEPTORS; HUMAN PHOTOPIC ELECTRORETINOGRAM; LUMINANCE-RESPONSE FUNCTION; ROD VISUAL-SYSTEM; CLINICAL-APPLICATION; FUNCTIONING AUTISM; NEGATIVE RESPONSE; EARLY-CHILDHOOD; LIGHT RESPONSE; BIPOLAR CELLS;
D O I
10.1007/s10633-016-9529-y
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
To explore early findings that individuals with autism spectrum disorder (ASD) have reduced scotopic ERG b-wave amplitudes. Light-adapted (LA) and dark-adapted (DA) ERGs were produced by a range of flash strengths that included and extended the ISCEV standard from two subject groups: a high-functioning ASD group N = 11 and a Control group N = 15 for DA and N = 14 for LA ERGs who were matched for mean age and range. Flash strengths ranged from DA -4.0 to 2.3 log phot cd s m(-2) and LA -0.5 to 1.0 log phot cd s m(-2), and Naka-Rushton curves were fitted to DA b-wave amplitude over the first growth limb (-4.0 to -1.0 log phot cd s m(-2)). The derived parameters (V (max), K (m) and n) were compared between groups. Scotopic 15-Hz flicker ERGs (14.93 Hz) were recorded to 10 flash strengths presented in ascending order from -3.0 to 0.5 log Td s to assess the slow and fast rod pathways, respectively. LA 30-Hz flicker ERGs, oscillatory potentials (OPs) and the responses to prolonged 120-ms ON-OFF stimuli were also recorded. The ISCEV LA b-wave amplitude produced by 0.5 log phot cd s m(-2) was lower in the ASD group (p < 0.001). Repeated measures ANOVA for the LA b-wave amplitude series forming the photopic hill was significantly (p = 0.01) different between groups. No group differences were observed for the distributions of the time to peaks of LA a-wave, b-wave or the photopic negative responses (phNR) (p > 0.08) to the single flash stimuli, but there was a significant difference in the distribution for the LA b-wave amplitudes (corrected p = 0.006). The prolonged 120-ms ON responses were smaller in the ASD group (corrected p = 0.003), but the OFF response amplitude (p > 0.6) and ON and OFF times to peaks (p > 0.4) were similar between groups. The LA OPs showed an earlier bifurcation of OP2 in the younger ASD participants; however, no other differences were apparent in the OPs or 30-Hz flicker waveforms. DA b-wave amplitudes fell below the control 5th centile of the controls for some individuals including four ASD participants (36 %) at the 1.5 log phot cd s m(-2) flash strength and two (18 %) ASD participants at the lower -2 log phot cd s m(-2) flash strength. However, across the 13 flash strengths, there were no significant group differences for b-wave amplitude's growth (repeated measures ANOVA p = 0.83). Nor were there any significant differences between the groups for the Naka-Rushton parameters (p > 0.09). No group differences were observed in the 15-Hz scotopic flicker phase or amplitude (p > 0.1), DA ERG a-wave amplitude or time to peak (p > 26). The DA b-wave time to peak at 0.5 log phot cd s m(-2) was longer in the ASD group (p = 0.04). Under LA conditions, the b-wave is reduced across the ASD group, along with the ON response of the prolonged flash ERG. Some ASD individuals also show subnormal DA ERG b-wave amplitudes. These exploratory findings suggest there is altered cone-ON bipolar signalling in ASD.
引用
收藏
页码:83 / 99
页数:17
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