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Biomedical subjects

W Strek

Publications and source records attributed to W Strek.

7 recordsLinked to original sources
PubMed1998

[Results of investigations of visual evoked potentials in the treatment of amblyopia].

PURPOSE: The aim of the study is to demonstrate the changes in visual evoked potentials (VEP) in treatment of amblyopia. MATERIAL AND METHODS: Pattern reversal VEP of 28 children treated because of amblyopia and 16 healthy persons were analysed. Before treatment and after treatment the results of the interocular amplitude difference ratio and interocular latency difference ratio were compared with standards. RESULTS: After treatment of amblyopia the percentage of normal interocular amplitude and latency difference ratios increased. CONCLUSION: Study of pattern VEP enables monitoring of amblyopia treatment.

Amblyopia↗
PubMed1998

[Changes observed in electrophysiological investigations in amblyopia and strabismus].

PURPOSE: The aim of the investigations was to state whether strabismic amblyopia and aniseiconia can be connected with disturbance of visual evoked potentials (VEP). MATERIAL AND METHODS: VEP investigations in 28 children with amblyopia, aged from 4 to 12 years and in 16 healthy persons were performed. Analysis of amplitude and latency of the positive wave P1 and negative wave N2 in the healthy eye and in the amblyopic eye was done. RESULTS: Statistical significance of the decrease of average amplitude of the fold in the record of the amblyopic eye at stimulation with small patterns was found. CONCLUSION: In amblyopia the amplitude of the pattern reversal VEP is decreased. Changes in the record of VEP in amblyopic eyes testify to the presence of transmission lesion in the retrobulbar visual pathway.

Amblyopia↗
PubMed1998

[Rare forms of non-neoplastic tumors of the lacrimal gland].

Out of the total number of 20 patients who in years 1982-1996 underwent surgery of the lacrimal gland in the Otolaryngological Clinic of the CM UJ, in 2 cases a rare form of tumor was diagnosed. They turned out to be: amyloidosis and sarcoidosis. Case histories, diagnostic difficulties, as well as methods of surgery, taking into consideration the latest views on the subject, were presented.

Adult↗
PubMed1996

Angiomorphology of the retrobulbar part of the optic nerve. A scanning electron microscopy of vascular casts.

The presented study was carried out on the fetal specimens of the eye-ball, together with the retrobulbar part of the optic nerve which were obtained from 15 human fetuses aged 16-20 weeks of the intrauterine life. The vascular casts were prepared by injection of low-viscosity resin Mercox which afterwards were analyzed in a scanning electron microscope (SEM). The technique employed allowed the authors to describe both the vascular pattern of the optic nerve as well as the network of arterial vessels which formed the Zinn and Haller's circle. The own original findings are compared with results obtained by other authors on the vasculature of the optic nerve in mammals and humans in different periods of the life.

Corrosion Casting↗
PubMed1995

Microvasculature of the human fetal extra-ocular muscles. A SEM corrosion casts.

In the light of already known differences on the vascular patterns between slow and fast contracing skeletal and extra-ocular muscles (EOM) which has been described in both mammals and man we were interested to see if same of these features are presented in the human EOM during the second half of the gestation. Therefore the microvasculature bed of EOM was studied by SEM of vascular corrosion casting technique. 15 human embryos at 16-20 week of gestation, after spontaneous abortion, were used for this study. The vasculature bed of the all EOM studied is composed of two layers i.e. the orbital and the global. The orbital layer, in all specimens examined, has shown a relatively higher number of transverse anastomoses than the global one, although the capillary vessels were arranged similarly on the both sides.

Corrosion Casting↗
PubMed1993

Hyaloid vessels of the human fetal eye. A scanning electron microscopic study of corrosion casts.

OBJECTIVE: Microscopic investigation of the hyaloid vascular system in 5-month-old human fetuses. METHODS: Corrosion casting and light and scanning electron microscopy. RESULTS: The hyaloid artery ramifies into a tuft of vasa hyaloidea propria, which communicates with the posterior portion of the tunica vasculosa lentis, characterized by a network of anastomosing vessels. They further pass to the lateral portion of the tunica, acquiring a nonanastomosing palisadelike array and drain into the vessels of the ciliary processes or, after bending over the edge of the developing iris, drain into the outer choriocapillaris. The tunica vasculosa lentis vessels also communicate with the pupillary membrane, a system of vascular arcades arranged in several interconnected tiers, supplied by the terminal branches of the long posterior ciliary arteries. In tunica vasculosa lentis, arterioles seem to pass directly into veins, without forming a capillary bed. CONCLUSIONS: At the investigated developmental stage, the fully developed hyaloid system enters its subsequent involution, and the vessels nourishing the vitreous have already involuted. The system is generally similar to that observed in other mammals.

Arteries↗