Biomedical subjects

H O Sener

Publications and source records attributed to H O Sener.

7 recordsLinked to original sources

PubMed2001

Visual evoked potentials in Parkinson's disease-correlation with clinical involvement.

A total of 18 patients with Parkinson's disease were evaluated clinically and by transient checker-board VEP study. There were significant differences between bradykinesia (P<0.01), rigidity (P<0.02), and tremor (P<0.05) subscores of the more and less severely affected sides. There were no asymmetry of VEP latency or amplitude between the more and less severely affected sides by stimulation of the corresponding eye. There were no significant correlations between the VEP latency or amplitude and any of the clinical features except the bradykinesia scores. The bradykinesia scores on the more severely involved side (r: 0.57; P=0.014) and less severely involved side (r: 0.82; P=0.00003) showed medium to high degree positive correlations with VEP amplitudes by stimulation of the corresponding eye. By studying monocular fullfield responses our data can only suggest that there is no prechiasmal asymmetry. The positive correlation between the VEP amplitude and bradykinesia score might indicate that D2 receptors dominate in the retina.

Adult↗

PubMed2001

Bilateral sixth-nerve palsy associated with dural arteriovenous malformation.

A fifty-two year old postmenopausal woman was admitted to the hospital with complaints of diplopia, headache, humming over the head, and pain over the left eye. Neurological examination showed right abducens nerve palsy. In a few days, she also developed left abducens nerve palsy and chemosis, exophthalmos, and proptosis of both eyes. There was pulsation over the left eye. Intraocular pressure was found to be elevated bilaterally. Selective carotid angiograms showed the presence of bilateral dural arteriovenous malformations (AVM) supplied by the external carotid arteries. Two months after the embolisation of the AVMs, eye movements improved. Repeat angiograms showed the absence of flow into the previously embolised AVMs.

Abducens Nerve Diseases↗

PubMed2000

Sympathetic skin response in carpal tunnel syndrome.

OBJECTIVES: Sudomotor efferent nerve fiber function was studied in carpal tunnel syndrome (CTS). METHODS: Bilateral median and ulnar sympathetic skin response (SSR) were recorded by sternal stimulation in 22 bilateral and 9 unilateral patients and compared with 21 healthy volunteers. RESULTS: There was no significant difference between median and ulnar nerve SSR latency, amplitude or area. The median nerve SSR was not different from that of the controls. The median-to-ulnar ratios of SSR parameters were not different in patients and controls. However, the median-to-ulnar ratios of SSR amplitude and area were lower than normal in 3 out of 7 patients with normal nerve conduction whereas this abnormality was found in only 4 out of 46 patients with abnormal nerve conduction. CONCLUSIONS: Normal SSR results, even in patients with complaints related to sudomotor sympathetic dysfunction, indicate that the SSR does not seem to be a sensitive diagnostic method in CTS.

Adolescent↗

PubMed2000

EMG needle causes severer pain in the end-plate region compared to the silent site of the muscle.

We investigated the severity and the quality of pain in the end-plate and the electrically silent site during electromyography by self-assessment. In 42 muscles of 30 patients, the mean pain score was 52.0 +/- 5.3 of 100 for the end-plate region, and it was 27.7 +/- 4.8 for the silent site. The commonest type of pain was pricking both in the end-plate region and the silent site (19 and 31%, respectively). We suggest two hypotheses for the difference. The pain fibers may be more densely situated in the end-plate, or muscle fiber contraction precipitated by needle irritation may also cause irritation of pain fibers.

Animals↗

PubMed1999

Functional imaging in reading epilepsy: a case report.

Reading epilepsy is an uncommon epileptic syndrome preferentially related to the temporoparietal region of the language dominant hemisphere. We report ictal and interictal brain perfusion SPECT images in a 28-year-old woman who was reading epilepsy.

Adult↗

PubMed1999

Effect of thigh flexion on somatosensory evoked potentials in meralgia paresthetica.

Standing with the thigh extended or lying still provokes and stepping or sitting relieves the symptoms in some patients with meralgia paresthetica. We performed this study to confirm this clinical feature with electrophysiological measures. Twenty-one symptomatic and 17 asymptomatic legs of 19 patients were evaluated by somatosensory evoked potential studies in both extended and flexed thigh positions. In the symptomatic group, thigh flexion significantly reduced the cortical latency. This finding is parallel with the relief of the symptoms.

Evoked Potentials, Somatosensory↗

PubMedDate not supplied

Pattern-reversal visual evoked potentials in migraineurs with or without visual aura.

To determine the possible electrophysiologic changes in migraineurs with or without visual aura, we investigated pattern-reversal visual evoked potentials in 39 patients. We compared the mean P100 latency and amplitude of 16 patients with aura, 23 patients without aura, and 17 age- and sex-matched normal subjects. There were no significant differences between groups. There was no correlation between age and the parameters in any group. However, in 7 of 23 patients without aura, the P100 latency was longer than the mean control value +2 SD. The mean disease duration in this subgroup was significantly longer than the means of the remaining 16 patients without aura or the patients with aura (P < 0.05 for each). This suggests the possibility that P100 latency prolongation is a consequence, but not an entity caused by the pathogenetic mechanism of the disease from the beginning.

Adult↗