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Biomedical subjects

H Nolte

Publications and source records attributed to H Nolte.

At least 127 records · Page 7Linked to original sources
PubMed1977

[Comparative studies on the antimicrobial activity of S-alkylthiuroniumhalides (author's transl)].

S-alkylthiuroniumhalides according to formula I (table 1) have been tested under standardized conditions with respect to their antimicrobial activity against bacteria, yeasts and fungi. In table 2 the bacteriostatic and fungistatic efficiency and in table 3 the microbicidal efficiency of 8 different S-alkylthiuronium compounds are compared with the efficiency of N,N-dimethyl-coconutoilalkyl-benzyl-ammonium-chloride. The germ inhibitory effect of the quaternary ammonium compound has been superior to the S-alkylthiuronium salts in almost all respects. The germicidal effect of the S-alkylthiuroniumhalides depends on the alkyl chain length bound to the S-atom and gets the optimum with S-dodecylthiuronium-chloride. Already a 0.0005% concentration is sufficient to kill all test germs within 30 minutes. S-dodecylthiuroniumchloride proved to be just as effective as the known well effective quaternary ammonium compounds. It seems to be possible to increase the microbicidal efficiency by additional alkylating - specially methylating - of both nitrogen atoms.

Arthrodermataceae↗
PubMed1977

[On spinal anaesthesia with isobaric bupivacaine 0,5% (author's transl)].

Clinical experiences of 5001 subarachnoid blocks using isobaric bupivacaine 0.5%, with and without adrenaline, for surgery are reported. The clinical results are satisfactory and no neurological sequelae are known to the authors. In vivo studies of C.S.F. after subarachnoid injection of bupivacaine 0.5% in an isobaric solution showed no changes in pH or precipitation. According to these results the authors see no contraindication in the use of bupivacine 0,5% for subarachnoid injection. The use of higher concentrations (e.g. 1%), however, can not be recommended.

Anesthesia, Spinal↗
PubMed1976

[Calculation of radioimmunochemical determinations by "spline approximation" (author's transl)].

A simplified method, based on the "spline approximation", is reported for the calculation of the standard curves of radioimmunochemical determinations. It is possible to manipulate the mathematical function with a pocket calculator, thus making it available for a large number of users. It was shown that, in contrast to the usual procedures, it is possible to achieve optimal quality control in the preparation of the standard curves and in the interpolation of unknown plasma samples. The recaluculation of interpolated values from their own standard curve revealed an error of 4.9% which would normally be an error of interpolation. The new method was compared with two established methods for 8 different radioimmunochemical determinations. The measured values of the standard curve showed a weighting, and there was a resulting quality control of these values, which, according to their statistical evalution, were more accurate than those of the others models (Ekins et al., Yalow et al., (1968), in: Radioisotopes in Medicine: in vitro studies (Hayes, R. L., Goswitz, F.A. & Murphy, B. E. P., eds) USA EC, Oak Ridge) and Rodbard et al. (1971), in: Competitive protein Binding Assys(Odell, W. D. & Danghedy, W. H., eds.) Lipincott, Philadelphia and Toronto). In contrast with these other models, the described method makes no mathematical or kinetic preconditions with respect to the dose-response relationship. To achieve optimal reaction conditions, experimentally determined reaction data are preferable to model theories.

Computers↗
PubMed1975

A comparative study between etidocaine and bupivacaine in ulnar nerve block.

The long-acting local anaesthetics bupivacaine and etidocaine were compared in a double-blind study using ulnar nerve block. Eleven volunteers took part in the study. Solutions used were: bupivacaine 0.25% and 0.5% and etidocaine 0.5% and 1 %. All solutions contained adrenaline 5 mug/ml. The time of onset and duration of analgesia and motor block, degree of motor block, and changes in skin temperature were investigated. The results did not show any differences in the duration of sensory of motor block. Differences were seen in the degree of motor block in favour of etidocaine. The sympathetic block seemed to be more intense and of longer duration with bupivacaine. Etidocaine had a shorter time of onset in all nerve fibres.

Acetanilides↗
PubMed1975

Comparative study with etidocaine and bupivacaine in epidural block.

Etidocaine 1% and bupivacaine 0.5% (both with adrenaline 5 mug/ml) have been compared in a double blind study in epidural analgesia. Time of onset, duration, recession of analgesia and intensity as well as frequency of motor blockade were recorded in a selected group of patients undergoing varicose vein stripping. The onset of action of etidocaine was more rapid. Duration, recession and intensity of analgesia were similar for the two drugs. The main difference between them was that etidocaine produced a higher frequency and greater intensity of motor blockade.

Acetanilides↗
PubMed1975

Brachial plexus blockade for evaluation of local anaesthetic agents.

Brachial plexus block (axillary approach) has been compared with ulnar nerve block for the evaluation of local anaesthetic drugs. Duration of analgesia is the same in both techniques with the same drugs. Following axillary nerve block the median, ulnar and radial nerves are blocked for a different time. The onset of motor block is faster following axillary nerve block, according to muscle power, but not according to action potentials in the e.m.g. Once all the nerves are blocked, no differences exist for the duration of muscle paralysis. The rate of techinical failure is higher with brachial plexus blocks compared with single nerve blocks. Larger amounts of local anaesthetic solutions are necessary for plexus blockade and this may cause toxic effects. The volunteer's comfort is less after plexus block because of more widespread paralysis. Therefore, ulnar nerve block and extradural block are in many respects the most suitable techniques for evaluation of new local anaesthetic agents.

Action Potentials↗
PubMed1975

[Axillary plexus block with long-acting local anaesthetics (a comparative study of etidocaine and bupivacaine) (author's transl)].

Brachial and axillary plexus blockade was carried out on volunteers using a mixture of etidocaine 1% with adrenaline, and bupivacine 0,5% with adrenaline. Both drugs are long-acting local anaesthetics. No difference has been established with regard to duration of analgesia and motor nerve block. Blockade of sympathetic nerve fibres lasts significantly longer with bupivacaine than with etidocaine. With the latter motor blockade seems to be more strongly influenced and significantly outlasts sensory sympathetic nerve block. The results and findings of other authors are discussed, and whether the different behaviour of the 2 long acting local anaesthetics in this context implies a different affinity of the drugs to the different types of nerves.

Acetanilides↗