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Biomedical subjects

B Kröner

Publications and source records attributed to B Kröner.

At least 19 recordsLinked to original sources
PubMed1984

[Ophthalmological experiences with automobile drivers with inadequate vision].

A total of 369 ophthalmological practices were asked to report the number of patients seen within one test week who drove their cars but did not satisfy minimum legal requirements for diurnal visual acuity applicable for applicants for a West German Class 3 driver's license. There were 471 such patients. From this number it can be calculated that approximately 570 000 individuals (+/- 9%) drive cars in the Federal Republic of Germany with inadequate visual acuity. An analysis of the questionnaire produced the following results: Fifty percent of these patients are less than 62 years of age. The main cause of inadequate visual acuity is age. In younger drivers refractive errors were the prime cause and in most cases correction with glasses was possible. In older drivers the loss of acuity was mainly due to opacities of the lens which for the most part could not be corrected by spectacles. Two-thirds of the drivers with inadequate visual acuity consider their vision to be "sufficient" or "good" for driving; younger drivers are more self-critical than older ones. Only 31% of these drivers stopped driving at night of their own accord. As many as two-thirds of the drivers who consider their acuity to be "insufficient" drive their cars during darkness. The authors show that the findings in patients suffering from severe loss of visual acuity must in principle also be valid for patients with minor visual impairments who still meet the minimum legal requirements. This agrees well with published statistical investigations.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1981

[Multiple ischemic infarction in the retina and uvea due to crystalline corticosteroid embolisms following subcutaneous facial infections (author's transl)].

Segmental ischemic infarctions in the uvea and retina were seen following injections of crystalline cortisone into keloids in the ipsilateral forehead skin. Seven similar cases described in the recent literature--also mainly due to crystalline corticosteroids--and several cases due to paraffin treatment, dating from the early years of this century, are discussed. The morphological basis of this rare, though typical, complication is the function of the ophthalmic artery as a bridging artery between the extracranial and intracranial circulation. An increase in pressure in branches of the external carotid artery--caused, for example, by peribulbar or facial injections--results in a reversal of flow and can lead to ischemic infarctions in the eye and orbit if embolizing substances are injected.

Adrenal Cortex Hormones↗
PubMed1981

Cytophotometric evidence of non-S-phase extra-DNA in human neuronal nuclei.

After Feulgen staining with acriflavine-Schiff, the DNa content of glial and neuronal nuclei from various sites of the human CNS (pre- and post-central gyrus, cerebellar cortex and spinal cord) were determined by fluorescence cytophotometry. The specimens were obtained from twelve adult human autopsy cases. Glial cell nuclei always revealed a biomodal DNA distribution pattern with a large 2c and a smaller 4c peak. The 4c peak was most prominent in the cerebellum. A few 8c glial nuclei were found. Neuronal cell nuclei disclosed DNA histograms with hyperdiploid means in the range 2.2-2.5c (1.8-2.9c for the individual populations). Tetraploid 4c DNA values were not observed, neither in Purkinje cells, nor in pyramidal cells. In eleven out of a total of forty-four slides the higher DNA means of neuronal nuclei were found to be statistically significant (P greater than 0.05) when compared with a population of 2c hepatocytes on the same slide. The results indicate the existence of some 'extra DNA' in human neuronal cell nuclei, the biological significance of which has still to be elucidated. It is however, suggested that it may play an important role in the functional activity of the CNS.

Adult↗
PubMed1980

[Longitudinal study of the effect of autogenic training on various forms of subjective perception of relaxation and the sense of well-being].

Our study was designed to investigate the therapeutic process caused by autogenic training in a differentiated and continous manner. Ss had to estimate their physical and mental relaxation during and beyond exercise in each of the 19 course-sessions. Their somatic and mental well-being before and after therapy was compared to a non-treated control-group. We found that improvement first occured at the physical level. Deep relaxation was first established during exercise and then transferred to the extra-therapeutic situation in the same succession. Physical and mental well-being improved clearly due to therapy. Though physical effects showed up earlier mental improvement were more pronounced at the end of therapy. We concluded, that an autogenic training course should comprise at least 13 sessions in order to come to a stabilization of therapeutic effects.

Autogenic Training↗