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  • 1975-1979  (7)
  • 1978  (2)
  • 1976  (5)
  • 1
    Digitale Medien
    Digitale Medien
    Induction of hepatic microsomal enzymes by Aroclor® 1254 inIctalurus punctatus (channel catfish) (1976)
    Springer
    Bulletin of environmental contamination and toxicology 16 (1976), S. 495-502 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01686169
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  • 2
    Digitale Medien
    Digitale Medien
    The effect of a progressive decrease in the circulating blood volume of the dog on the transthoracic impedance (1976)
    Springer
    Intensive care medicine 2 (1976), S. 119-124 
    Details
    ISSN: 1432-1238
    Schlagwort(e): Thoracic impedance ; Haemorrhage
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The correlations between the haemodynamic and transthoracic electrical impedance changes resulting from a progressive reduction in the circulating blood volume were studied in four intact mongrel dogs artificially ventilated with a mixture of halothane in nitrous oxide-oxygen. The cardiac output of the dogs was measured by both the electrical impedance and the fibre optic dye dilution techniques. It was found that significant correlations existed between the blood loss and the arterial blood pressure, the maximum first derivative of the transthoracic impedance, the Heather Index, the transthoracic impedance, the maximum rate of change of aortic pressure and the cardiac stroke work. There was also a good correlation between the dye and impedance cardiac output values, the impedance value always being higher than the corresponding dye value. The correlation between the Heather Index and the PEP/LVET ratio and 1 /PEP2 varied markedly from dog to dog.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00579692
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  • 3
    Digitale Medien
    Digitale Medien
    The first derivative of the transthoracic electrical impedance as an index of changes in myocardial contractility in the intact anaesthetised dog (1978)
    Springer
    Intensive care medicine 4 (1978), S. 43-50 
    Details
    ISSN: 1432-1238
    Schlagwort(e): Myocardiac contractility changes ; Thoracic electrical impedance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The suitability of the peak value of the first derivative of the thoracic electrical impedance dZ/dtmax has been investigated in dogs as a non-invasive index of changes in myocardial contracility by comparing if with the peak left ventricular dP/dt and the peak values of aortic blood velocity and acceleration. An increase in the inspired halothane concentration was used to produce changes in contracility. In 5 dogs the combined values for the correlation coefficient between dZ/dtmax peak velocity and acceleration were respectively 0.937, 0.954 and 0.950. In 14 out 15 comparisons p〈0.001 and in one, p〈0.01. On these grounds, dZ/dtmax is proposed as a variable worthy of consideration in patient monitoring.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01683136
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  • 4
    Digitale Medien
    Digitale Medien
    The effect of respiration on the monitoring of stroke volume and cardiac output by the electrical impedance technique (1976)
    Springer
    Intensive care medicine 2 (1976), S. 3-6 
    Details
    ISSN: 1432-1238
    Schlagwort(e): Impedance cardiogram ; Cardiac output ; Stroke volume ; Averaging
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In six volunteers (5 male, 1 female) it has been shown that normal respiration made no statistical difference to the estimates of the mean stroke volume and the mean cardiac output as determined by the electrical impedance method of Kubiceket al, (1966). The coefficient of variation was usually increased by respiration. The use of those stroke volumes which occur only at end-expiration was not shown to yield a greater reproducibility with 3 other male volunteers. In the female subject it was found that the use of a digital averager triggered from the preceding R-wave of the ECG gave values for the mean stroke volume and cardiac output which were always lower than the conventional mean values obtained from a number of strokes. The expense of either of these approaches does not appear to be justified as a means of compensating for the effects of normal respiration on the impedance dZ/dt waveform.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00571889
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  • 5
    Digitale Medien
    Digitale Medien
    An analogue circuit for the computation of stroke volume by the electrical impedance method (1976)
    Springer
    Medical & biological engineering & computing 14 (1976), S. 74-78 
    Details
    ISSN: 1741-0444
    Schlagwort(e): Impedance cardiograph ; Analogue computer ; Stroke volume ; Cardiac output
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Beschreibung / Inhaltsverzeichnis: Sommaire L'article décrit un circuit analogue servant à mesurer les volumes de battement pour usage en conjonction avec l'e.c.g.dZ/dt et les signaux phonocardiogrammes produits par un cardiographe d'impédance IFM. L'affichage est effectué sur un cadran numérique. Ce circuit peut être étendu pour mesurer le rendement cardiaque.
    Kurzfassung: Zussammenfassung Es wird eine Analogschaltung zum Einsatz in Verbindung mit dendZ/dt-, e.k.g.-und Phonokardiogrammsignalen von einem IFM-Impedanz-Kardiographen zur Messung des Hubvolumens beschrieben. Die Anzeige erfolgt auf einem digitalen Meßgerät. Die Schaltung kann zur Messung der Herzleistung erweitert werden.
    Notizen: Abstract An analogue circuit is described for use in conjunction with thedZ/dt, e.c.g. and phonocardiogram signals from an IFM Impedance Cardiograph to measure stroke volume. This is displayed on a digital meter. The circuit can be extended to measure cardiac output.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02477094
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  • 6
    Digitale Medien
    Digitale Medien
    Detrusor and uterine cervix electromyography (1976)
    Springer
    Medical & biological engineering & computing 14 (1976), S. 432-435 
    Details
    ISSN: 1741-0444
    Schlagwort(e): Bladder e.m.g. ; Cervix e.m.g.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract Electromyographic studies of various smooth muscle organs have been made by different workers to define the normal physiology and to try to elucidate the nature of some pathological conditions. High-frequency low-voltage activity has been recorded previously from both the uterus and the bladder. Low-frequency high-voltage activity recorded from the bladder and from the gastrointestinal tract has been shown to correlate with different pathological disorders. The paper describes the low-frequency high-voltage electromyographic activity, previously unreported, which can be recorded from the cervix uteri, and discusses the means of computer frequency analysis in the quantisation of such signals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02476120
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  • 7
    Digitale Medien
    Digitale Medien
    Editorial changes forMedical & Biological Engineering & Computing (1978)
    Springer
    Medical & biological engineering & computing 16 (1978), S. 341-341 
    Details
    ISSN: 1741-0444
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02442649
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