Biomedical subjects
Publications and source records attributed to K Schindler.
The ototoxicity of the kanamycin fragment 3-amino-3- deoxy-D-glucose (3-aminoglucose, kanosamine), was investigated by perilymphatic perfusion in the guinea pig. Concentrations of 10 or 28 mM of this compound had no effect on cochlear microphonic potentials (CM), contrasting with previous observations (Owada 1962). Kanamycin at 1 mM decreased CM significantly under otherwise identical conditions. The action of kanamycin was at least partially reversible.
The clinical efficacy and toleration of amikacin was investigated in 22 patients most of whom had chronic urinary tract infections that had already been treated unsuccessfully on several occasions with other antibiotics. Amikacin was administered i.m. in a dosage of 7.5 mg per kg twice daily for an average of 11.4 days. This new aminoglycoside antibiotic proved highly effective in the treatment of chronic pyelonephritis and cystitis, as well as in septicaemia caused by gentamicin-resistant Pseudomonas. The pharmacokinetic studies did not show any retention after a ten day treatment with amikacin. Thorough nephrologic and otologic investigations for side-effects did not show any permanent nephrotoxic or ototoxic damage or delayed damage. The results were compared with the clinical and experimental data in the literature and with the results of experimental studies which have not yet been published.
Lipids can be found sporadically in the maxillary sinus especially in connection with chronic sinusitis. Thus, the occurence of cholesterol is known for decades. Nevertheless most of the lipids in the excretions of maxillary sinus are unknown or less investigated still today. It may be that there is a lack of simple analytical methods. The intention of this paper is to demonstrate early results with TLC-separation and determination of lipids in the maxillary sinus excretions during sinusitis. The samples were collected from patients of the HNO-Klinik Würzburg in connection with a therapeutic rinsing of the sinus. The effluent was concentrated and then separated into three fractions by ultracentrifugation: 1. The sediment, consisting of cells and some other undefined organic material. 2. A supernatant clear solution, containing inorganic material, proteins, amino-acids, lipids... 3. Sporadically a very thin layer on the surface of the clear solution. Since fraction 3, which contains lipids too, could not be found each time, our attention was directed on the lipids of the clear solution, where most of these substances are attached to proteins. As well as in the sediment we found in the clear solution cholesterol, free fatty acids, triglycerides and very seldom cholesterol-esters. The concentration of cholesterol is nearly the same as that of free fatty acids. The frequency of occurrence of lipids is considerable which prevents us until now to correlate the lipid-content to some features of diagnosis, prognosis and therapy.
The mercury-tissue-concentrations of implants (structures of the middle ear, bones, cartilage, dura) after preservation in solutions of cialit are mostly independent on preservation conditions, low and seem to be physiological. A positive correlation exists between the weight of the implant and the mercury-tissue concentrations. An enrichment with mercury-ions cannot be stated. The statements do not concern the mercury which is bound on cialit in the implant.
The effect of four frequently used antibiotics on the germs of the sinus maxillaris was studied. For this purpose germs of the sinus max. rinsing fluid, got from 127 patients, were cultured under nearly the same physical and chemical conditions which can be expected in the sinus itself. Each antibiotic substance was studied with three different comcentrations in the culture medium. By extrapolation of the linear regression between some characteristical parameters of the culture absorbancy development and the concentration, the inhibitory concentration can be estimated. The efficacy decreases in the following order: Doxycyclin greater than Gentamycin greater than Ampicillin greater than Lincomycin. An inhibitory concentration results, if the antibiotics are instilled in the sinus itself. The general side effects can be neglected but not at all the local ones. Investigations in this direction are still going on. As a preliminary report, 700 instillations of Lincomycin turned out with no incident.
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