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  • Neurotoxicity  (1)
  • Nifedipine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 451-457 
    ISSN: 1432-1440
    Keywords: β-Acetyldigoxin ; Digitoxin ; Nifedipine ; Pharmacokinetics ; Pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of nifedipine (N) on the pharmacokinetics and pharmacodynamics of β-acetyldigoxin (AD;n=11) and digitoxin (DGT;n=10) was studied in 21 patients with cardiac insufficiency stage II–III NYHA. Glycoside plasma concentration and renal excretion as well as electrocardiogram heart rate, atrioventricular transconduction time (PQ), duration of electrical systole corrected for heart rate (QTc), mean amplitude of T waves in leads V2 to V6 (TV2−6) and systolic time intervals total electromechanical systole index (QS2I), left ventricular ejection time index (LVETI), pre-ejection period index (PEPI), PEP/LVET-ratio were recorded repeatedly before and during coadministration of 40–60 mg/day N. Plasma AD concentrations were 0.64±0.22 ng/ml (mean±SD) before and 0.61±0.21 ng/ml during co-administration of N over 10–14 days, plasma DGT concentrations 13.9±4.1 ng/ml before and 13.7±4.5 ng/ml during co-administration of N over 4–6 weeks. Daily glycoside excretion was not affected by treatment with N. Heart rate and PQ-interval were not significantly changed during co-administration of N whereas T-wave flattening was intensified and QT-duration was lengthened. Concomitant treatment of AD and N led to an increase of PEPI and PEP/LVET compared to AD alone in ten patients whereas the systolic time intervals after concomitant treatment of DGT and N in most patients did not differ from those after DGT alone. From our findings we conclude that N had no clinically significant effect on pharmacokinetics and pharmacodynamics of AD or DGT.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1246
    Keywords: Key words Painters ; Organic solvents ; Neurotoxicity ; Symptoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objectives: The main aim of the study was to examine possible solvent-associated effects on the nervous system in currently employed painters. Special attention was paid to evaluate subtle health effects. Materials and methods: A total of 401 painters and 209 construction workers without solvent exposure with at least 10 years of professional experience were subjected to a clinical, neurological, psychiatric, neuropsychological and neurophysiological examination. For personal medical and occupational history, standardized questionnaires were used. A quantitative rating of exposure was obtained by expert rating of the respective occupational history without knowledge of the individual test results. Results: There was no excess of somatic disorders or solvent-associated adverse effects on the nervous system. No distinct effects of solvent exposure on nerve conduction velocities (NCV) or cognition were found. Discrete NCV deficits in painters were not considered a sign of subclinical polyneuropathy. Painters, however, reported an excess of specific symptoms that could be assigned to “mood and behaviour”. The differences between specific and non-specific questionnaire outcomes on the one hand and the positive correlation between chronic exposure index and symptom scores on the other hand support the hypothesis of solvent-induced effects. Because data is lacking on past solvent exposure, it is not possible to relate these effects to current exposure limits. Conclusions: Currently employed painters differ from controls not exposed to solvents with respect to the frequency of certain symptoms in mood and behaviour. These symptoms are related to life-long solvent exposure rather than to current exposure. At present, the issue of time course and reversibility or irreversibility of these symptoms cannot be answered. The predictive value for subsequent neuropsychiatric morbidity remains to be elucidated in follow-up studies.
    Type of Medium: Electronic Resource
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