Relationship between Ciliary Perfusion Pressure and Pattern-Reversal Visual Evoked Cortical Potentials: An Electro-Encephalo-Dynamographic Investigation

Ulrich, W.-D.; Ulrich, Ch.; Bohne, B.-D.; Niederländer, C.

doi:10.1159/000265444

Ophthalmic Res

1986

DOI: 10.1159/000265444

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Relationship between Ciliary Perfusion Pressure and Pattern-Reversal Visual Evoked Cortical Potentials: An Electro-Encephalo-Dynamographic Investigation

W.-D. Ulrich

Ch. Ulrich

B.-D. Bohne

et al.

Abstract: Pattern-reversal visual evoked cortical potentials (VECP) taken from 25 healthy volunteers before, during and after short-lasting elevation of intraocular pressure proved to be dependent on ciliary perfusion pressure (pp_cil) in a characteristic way. Reductions of pp_cil to ca. 30 mm Hg did not result in VECP changes. These results point to efficient autoregulation in the retinal circulation and in the circulatory region of the anterior part of the optic nerve. When ppcil was reduced to bel… Show more

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Cited by 5 publications

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VEP, physiological and psychological circadian variations in humans

Aschoff

Born

1988

J Neurol

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Amplitudes and latencies of components of visual evoked potentials (VEPs) were analysed during the 24-h cycle in humans. Circadian variations of other physiological parameters (oral temperature, urine volume and urinary potassium excretion) and of psychomotor performance (grip strength, tapping rate, visual reaction time and performance on a letter cancellation test) were also assessed. Eight male volunteers (aged 20-34 years) were tested twice over a period of 30 h. Test sessions took place every 3 h (1100 hours, 1400 hours etc.). VEPs were elicited by checkerboard pattern reversals. Significant circadian variations in the VEPs were found for the latencies of the P100 and N140 components, which were longest between 2 a.m. and 5 a.m. (P100: 103 ms; N140: 138 ms) and shortest at about 5 p.m. (P100: 97 ms; N140: 130 ms). Pronounced circadian variations were also observed in physiological parameters and in psychomotor performance measures. Circadian variation of oral temperature was correlated with the 24-h profiles of most of the other variables. Time courses of VEP latencies and oral temperature were moderately negatively correlated. However, from the data presented it seems premature to conclude that there is a common pacemaker for the circadian variations of the different parameters investigated.

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VEP, physiological and psychological circadian variations in humans

Aschoff

Born

1988

J Neurol

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PR VECPs related to ciliary perfusion pressure in primary open angle glaucoma

et al. 1992

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Pr VECP studies in glaucoma patients with the IOP raised artificially by the suction cup method have recently been performed by several authors, who arrived at different results. The reason for those differences may be the changes employed. The refraction changes depend on the shape of the suction cup and the height of the artificial IOP raise. By using contact lenses and a suitably shaped suction cup refraction changes could be compensated for. Studies of the pr VECP with suction cup IOP elevation and simultaneous compensation for refraction changes by applying contact lenses were made on 17 patients with primary open angle glaucoma and 21 healthy volunteers. In healthy subjects pr VECP amplitudes were found unaltered or even slightly increased until 120 mmHg of negative pressure were reached in the cup. Beyond that range they dropped. Latencies remained unaltered over that range of negative pressures. Plotting the pr VECP amplitudes and latencies against ciliary perfusion pressure we obtained unaltered potentials over a range of ca. 20 mmHg, which we interpreted as autoregulative capacity. In the 17 glaucoma patients various degrees of impaired autoregulation were found corresponding to the progression of glaucoma damage.

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Differential effects of compression and suction ophthalmodynamometry on the scotopic blue?flash electroretinogram

1993

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Several studies have investigated the effect of elevated intraocular pressure with reduced ocular perfusion pressure on visual neural function by means of compression and suction ophthalmodynamometry. We compared the effects of nominally equivalent reductions in the ocular perfusion pressure induced by compression and suction ophthalmodynamometry retinal function as measured by flash electroretinography. Scotopic blue-flash electroretinograms were recorded in five subjects for baseline conditions; during a 40% reduction in the ocular perfusion pressure effected in a first test session by compression ophthalmodynamometry; and then in a second test session some 4 hours later by suction ophthalmodynamometry. Fifteen consecutive electroretinographic sets were recorded during scleral compression or suction, and also after compression or suction was removed. Compression and suction ophthalmodynamometry decreased the electroretinogram b-wave to different degrees; overall, the electroretinogram was attenuated more by compression than by suction ophthalmodynamometry. In the recovery phase, the group averaged b-wave quickly increased to exceed baseline after both scleral compression and suction. The trends for prolonged implicit times over the duration of the study were similar for compression and suction ophthalmodynamometry.

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Relationship between Ciliary Perfusion Pressure and Pattern-Reversal Visual Evoked Cortical Potentials: An Electro-Encephalo-Dynamographic Investigation

Cited by 5 publications

References 2 publications

VEP, physiological and psychological circadian variations in humans

VEP, physiological and psychological circadian variations in humans

PR VECPs related to ciliary perfusion pressure in primary open angle glaucoma

Differential effects of compression and suction ophthalmodynamometry on the scotopic blue?flash electroretinogram

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