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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 70 (1992), S. 130-135 
    ISSN: 1432-1440
    Keywords: Cardiac rhythm ; Elderly ; Normal subjects ; Holler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To study the normal cardiac rhythm in elderly subjects we performed 24-h Holter monitoring on 94 subjects aged over 70 years. We had previously discarded those with cardiac disease by using history, physical examination, electrocardiography (ECG), chest X-radiography and Doppler echocardiography. The maximum, average and minimum heart rates were 113, 79 and 62, respectively, during the day, and 90, 64 and 53 during the night. Supraventricular and ventricular arrhythmias were frequent (91% and 89.4% respectively). Some 50% of the subjects had complex ventricular arrhythmias. Two subjects presented with sinus pauses of more than 2 s, and 4 had Wenckebach second-degree atrioventricular (AV) block. During a follow-up averaging 20.8 months, there were no deaths or symptoms of an arrhythmic origin.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Intensive care medicine 13 (1987), S. 208-210 
    ISSN: 1432-1238
    Keywords: Hypokalemia ; Hyperkalemia ; 17-alpha-hydroxylase deficiency ; Adrenocortical deficiency ; Quadriplegia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report two cases of ascending muscular weakness progressing to areflexic quadriplegia caused by severe derangement of potassium homeostasis. The first patient presented with a 17-alpha-hydroxylase deficiency and severe hypokalemia. The second case had primary adrenocortical deficiency (Addison's disease) and extreme hyperkalemia. Complete recovery ensued after correction of the metabolic disorder in both cases. The role of potassium in the pathophysiology of neuromuscular excitation is discussed. We conclude that when neuromyopathy is present, metabolic causes should be considered and the serum potassium determined.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-3017
    Keywords: Daphnia magna ; sediment toxicity ; reproduction ; hormesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The ecotoxicity of sediments from ten contaminated sites of the Nervion river catchment were assessed with the three-brood chronic sediment bioassay of Daphnia magna. Three additional locations were used as reference sites and one site as control for every bioassay. Survival, number and biomass of neonates and final adult biomass were measured as chronic ecotoxicity endpoints. High mortality of daphnids was observed at one site where sediment was heavily contaminated by metals. At the remaining sites only sublethal reproductive responses were observed, including inhibition of maturity and hence of reproduction, brood delay, reduction in number of neonates and lower adult final biomass. Hormetic responses in adult final biomass and number of neonates per brood were observed where toxicant concentrations were low or were not bioavailable. Female fecundity increased with size in the controls but the reproductive effort is lower in daphnids exposed to contaminated sediments. This was interpreted as an auto-conservative strategy of the species.
    Type of Medium: Electronic Resource
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