Prognostic value of the pattern electroretinogram in cases of tumors affecting the optic pathway

Abstract · Background: Tumors compressing the optic pathway may lead to irreversible loss of vision which may be detected by the pattern electroretinogram (PERG) because of its relation to ganglion cell function. · Methods: Eyes of 19 patients were tested shortly before and 5–10 days after tumor surgery. Visual acuity, the 30-deg visual field and the transient and steady-state pattern reversal ERG were measured. · Results: Using patterns of 1.5×1.2 deg there was a good correlation between the change of pre- and post-surgical visual performance and most of the pattern ERG amplitudes. For all variables tested – P50, N95 and steady-state amplitude – there was a critical value beyond which the visual outcome could be bad or favorable, whereas patients showing higher amplitudes always remained stable or improved after surgery. · Conclusion: The positive correlation between pattern ERG amplitudes and the post-surgical outcome in the case of tumors affecting the optic pathway may be helpful in predicting the outcome for these patients.

[1]  R. H. Steinberg,et al.  Proximal retinal contribution to the intraretinal 8-Hz pattern ERG of cat. , 1987, Journal of neurophysiology.

[2]  C. Baker,et al.  Human pattern-evoked electroretinogram. , 1984, Journal of neurophysiology.

[3]  A. Schick,et al.  Electrical Responses of the Human Eye to Moving Stimulus Patterns. , 1964, Science.

[4]  C. Teping,et al.  Topodiagnostik von Sehstörungen durch Ableitung retinaler und kortikaler Antworten auf Umkehr-Kontrastmuster , 1980 .

[5]  E. Altenmüller,et al.  Electrophysiological and psychophysical examination in patients with optic nerve compression , 1995 .

[6]  S. Elkington Pituitary adenoma. Preoperative symptomatology in a series of 260 patients. , 1968, The British journal of ophthalmology.

[7]  E. Dodt,et al.  Postoperative Erholung der Sehfunktion bei Stellatumoren: Prognostische Einschätzung durch elektroophthalmologische Untersuchungen , 1989 .

[8]  E. Zrenner,et al.  Die Lokalisation elektroretinographischer Antworten auf Musterumkehrreize und Helligkeitsreize in einzelnen Schichten der Primatennetzhaut , 1987 .

[9]  R. Smith,et al.  Eye signs in craniopharyngioma. , 1975, The British journal of ophthalmology.

[10]  C. Earl,et al.  Compressive lesions of the optic nerves and chiasm. Pattern of recovery of vision following surgical treatment. , 1975, Brain : a journal of neurology.

[11]  L. Maffei,et al.  Pattern ERG in the monkey after section of the optic nerve , 1986, Behavioural Brain Research.

[12]  A. Fiorentini,et al.  Electroretinographic responses to alternating gratings before and after section of the optic nerve. , 1981, Science.

[13]  Vaegan,et al.  CLINICAL AND EXPERIMENTAL EVIDENCE THAT THE PATTERN ELECTRORETINOGRAM (PERG) IS GENERATED IN MORE PROXIMAL RETINAL LAYERS THAN THE FOCAL ELECTRORETINOGRAM (FERG) , 1980, Annals of the New York Academy of Sciences.

[14]  M CHAMLIN,et al.  Ophthalmologic changes produced by pituitary tumors. , 1955, American journal of ophthalmology.

[15]  W. Heider,et al.  Amplituden- und Latenzänderungen im Muster-Elektroretinogramm (M-ERG) bei Netzhaut- und Sehnervenerkrankungen , 1988 .