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Biomedical subjects

A Kriss

Publications and source records attributed to A Kriss.

84 records · Page 5Linked to original sources
PubMed1978

Neurological asymmetries immediately after unilateral ECT.

Twenty-nine right handed patients were examined neurologically before and immediately after each of 62 unilateral ECTs to the dominant and non-dominant hemispheres. Most convulsions were followed by signs of transitory neurological dysfunction referable to the treated hemisphere. These signs included deep tendon reflex asymmetry, hemiparesis, tactile and visual inattention, and homonymous hemianopia. After treatment to the right hemisphere some patients had left visuospatial neglect, while all patients who had dominant hemisphere ECT were transiently dysphasic. All neurological abnormalities tested resolved within 20 minutes of treatment.

Aphasia↗
PubMed1976

The pattern-evoked potential in compression of the anterior visual pathways.

Pattern evoked responses have been recorded in 19 patients with compression of the optic nerve, chiasm or tract, verified at operation. These included 4 patients with orbital tumours, 5 with intracranial meningiomas, 2 with craniopharyngiomas and 8 with pituitary tumours. The evoked response was abnormal in all except one of these patients. The pattern of abnormalities in the response, however, differed from that in the earlier series of patients with primary demyelinating disease. The incidence of delayed responses was much lower, and the magnitude of the delays was smaller. Absent responses were particularly characteristic of patients with intracranial meningiomas. Tumours arising in the region of the sella turcica were associated with a high incidence of abnormalities of the waveform of the response, and asymmetry of the field of the occipital evoked potential was especially characteristic of this group. Most, but not all, asymmetric cases were associated with field defects.

Adult↗
PubMedDate not supplied

Effects of experimental scotomata on sequential pattern-onset, pattern-reversal and pattern-offset visual evoked potentials.

The effect of experimental scotomata on visual evoked potentials to half-field stimulation using sequential checkerboard onset, reversal and offset was investigated in 10 normal subjects to assess the relative sensitivity of the three stimulus modes, and the contributions of pathways subserving macular and paramacular parts of the visual field. Four scotoma sizes (0-1.5 degrees , 0 degrees - 2 degrees, 0 degrees -3 degrees and 0 degrees -4.5 degrees ) were used to mask the central part of the stimulus field (0 degrees -12 degrees ). Five check sizes (6', 12', 20', 50' and 80') were presented for each scotoma size. Peak-to-peak amplitudes and peak latencies of components on the ipsilateral and contralateral sides of the scalp to the stimulated half-field were measured. Scotoma size was highly significant in influencing component amplitude (p < 0.0001) and latency (p < 0.03) of all ipsilateral and contralateral onset components and all ipsilateral reversal and offset components. Components that were attenuated to the greatest extent with the smallest 0 degrees -1.5 degrees scotoma were the contralateral onset P105 and ipsilateral reversal P100 and N145. Onset CIII, reversal N80, and offset N85 and P110 only showed a significant attenuation after the use of scotomata of 0 degrees -3 degrees and larger. Our results show that scotoma size is a significant factor in influencing all the major visual evoked potential components, with the exception of reversal and offset contralateral potentials (N105 and N115), probably reflecting their paramacular origins. Reversal, ipsilateral P100 and N145, and onset, contralateral P105, appear to be predominantly of macular origin and the most sensitive potentials for detecting effects of small central scotomata.

Adult↗
PubMedDate not supplied

The infant with nystagmus, normal appearing fundi, but an abnormal ERG.

Many retinal disorders present during infancy with nystagmus, decreased vision, and normal-appearing fundi, but an abnormal ERG. The most common of these disorders are Leber's congenital amaurosis, achromatopsia, and congenital stationary night-blindness. Other disorders with similar ocular manifestations may be associated with a variety of life-threatening systemic abnormalities. This review describes the clinical, electrophysiological, and laboratory findings that can be used to distinguish among these conditions.

Blindness↗
PubMedDate not supplied

Complete cryptophthalmos: case report with normal flash-VEP and ERG.

We report an infant with bilateral complete cryptophthalmos as part of Fraser Syndrome. Clinical examination and recordings of the electroretinogram and flash visual evoked potential showed a functional visual pathway at retinal and post-retinal levels. Anatomical considerations and the possible complications of surgery made reconstruction of the lids and palpebral fissures inappropriate.

Abnormalities, Multiple↗
PubMedDate not supplied

Persistent pupillary membranes.

Extensive persistent pupillary membranes which occlude the pupil may occur in isolation or in association with other ocular anomalies. Amblyopia may result if the membranes are extensive. We favor nonsurgical intervention except if unusual circumstances are present as demonstrated in one of our two cases.

Child↗
PubMedDate not supplied

Electrophysiological and eye-movement abnormalities in children with the Bardet-Biedl syndrome.

We investigated 17 patients with clinical features of Bardet-Biedl syndrome by electroretinogram (ERG), visual-evoked potentials (VEP), and electro-oculographic (EOG) eye movement assessment. The ERGs were grossly abnormal in 16 cases. Pattern VEPs were generally well preserved, but showed a tendency to increase in latency and decrease in amplitude with age. These results confirm other reports that the retinopathy appears to be a progressive rod-cone dystrophy initially affecting mainly extramacular areas but involving the macula at later stages. Seven of 11 patients showed abnormalities of either optokinetic nystagmus, vestibulo-ocular reflex, or both. These eye-movement abnormalities have not been reported previously, and are further evidence of central nervous system involvement in this syndrome.

Adolescent↗