Biomedical subjects

E Mustonen

Publications and source records attributed to E Mustonen.

29 records · Page 2Linked to original sources

PubMed1980

Electroretinography by skin electrodes and signal averaging method.

In the investigation of suspected visual disorders, ERG is of considerable value. A simplified method for clinical electroretinography by non-corneal electrodes is presented. The latency and amplitude values were measured in 22 normal subjects. Using skin electrodes and signal averaging, we can record, without discomfort to the patient, an electroretinogram with a waveform and time relations similar to those obtained by corneal electrodes. Non-corneal ERG is useful for infants, children as well as sensitive adult patients, and is also applicable after recent eye surgery and in cases of infection or injury of the anterior segment. Since non-corneal electrodes do not obstruct the stimulus light or cause of refractive change, they are advantageous when ERG is recorded simultaneously with visually evoked cortical response (VER). When it is important to stimulate only one eye at a time in flash VER, the adequacy of the cover is verified by the absence of an ERG from the covered eye.

Adult↗

PubMed1980

Electroretinogram (ERG) and visual evoked response (VER) studies in patients with optic disc drusen.

Non-corneal ERGs, recorded from infraorbital skin electrodes to flash stimulation and mid-occipital and parasagittal VERs to both flash stimulation and pattern reversal were performed in 26 patients with optic disc drusen. ERGs were normal in all patients. The mean VER amplitude was lower in the eyes with optic disc drusen than the mean amplitude of VERs in the normals but the interindividual variation was also so great in normals that the difference was not significant. The waveform of the major positive peak was quite often broad or split. VER latencies were usually in normal range although the visual field defects could be rather severe. Some other cause was present when the major positive peak was delayed.

Electroretinography↗

PubMed1977

Optic disc drusen and tumours of the chiasmal region.

Two patients with optic disc drusen and tumour of the chiasmal region are presented. The association of optic disc drusen and intracranial space-occupying lesion is probably a chance occurrence. In spite of the recognition of the optic disc drusen, certain findings indicate further examinations. Progressive loss of central visual acuity unexplained by retinal pathology is an indication for a neurological investigation. Bitemporal and homonymous hemianopic visual field defects as well as evidence of papilloedema warrant a neurological evaluation.

Adult↗

PubMed1977

Arachnoid cyst of the intraorbital portion of the optic nerve with unilateral disc oedema and transient shallowing of the anterior chamber. A case report.

An unusual occurrence of chronic monocular disc oedema, visual loss and shallowing of the anterior chamber in a patient with an arachnoid cyst involving a portion of the intraorbital optic nerve was reported. Decompression of the optic nerve sheath through a Krönlein approach was followed by prompt deepening of the anterior chamber and a gradual, delayed relief of the disc oedema. It is concluded that orbitotomy and decompression of the optic nerve sheath should be done before atrophic changes of the optic nerve and visual loss begin to develop.

Adult↗

PubMed1976