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  • 1
    ISSN: 1741-0444
    Keywords: Cardiac assistance ; Counterpulsation ; Intra-aortic balloon pumping ; In-series assistance ; Microprocessor controller
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Les résultats de recherches présentés dans cet article peuvent être résumés comme suit: La défibrillation cardiaque est un phénomène lié à l'orientation du courant électrique. Il existe un axe cardiaque préférentiel pour une défibrillation efficace. Cet axe préférentiel n'est pas lié de façon simple à la position d'une électrode de surface. Des méthodes plus efficaces de défibrillation utilisent des électrodes introduites dans l'oesophage ou dans la trachée de préférence aux électrodes de surface. Les mesures d'impédance de la région thoracique et du coeur montrent que l'usage d'un courant alternatif à basse fréquence est probablement le stimulus défibrillateur le plus efficace. Bien que le courant continu soit efficace, il y a un plus grand risque d'électrolyse qu'avec un courant alternatif.
    Abstract: Zusammenfassung Die in dieser Arbeit mitgeteilten Forschungsergebnisse können folgendermaßen zusammengefaßt werden: Die Herzdefibrillierung ist ein elektrisches Phänomen. Es gibt eine Vorzugsachse für die wirksame Defibrillierung des Herzens. Die Vorzugsachse des Herzens kann nicht leicht zu der Elektrodenlage auf der Körperoberfläche in Beziehung gesetzt werden. Wirksamere Defibrillierungsmethoden nehmen endoösophageale oder endotracheale Elektroden zu Hilfe, nicht zwei Körperoberflächenelektroden. Impedanzmessungen des Thoraxbereiches und des Herzens ergeben, daß niederfrequenter Wechselstrom wahrscheinlich der wirksamste Defibrillierungsreiz ist. Obwohl Gleichstrom auch wirksam ist, besteht dort mehr als mit Wechselstrom die Gefahr einer Elektrolyse.
    Notes: Abstract The findings from the research reported in this paper may be summarized as follows: Cardiac defibrillation is an electric current oriented phenomenon. There is a preferred cardiac axis for effective defibrillation. The cardiac preferred axis cannot be related easily to body surface electrode placement. More effective methods of defibrillation involve the use of endoesophageal or endotracheal electrodes rather than two body surface electrodes. Impedance measurements of the thoracic region and the heart indicate that low frequency alternating current is probably the most effective defibrillating stimulus. While direct current is effective, there is a greater risk of electrolysis than with alternating current.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1741-0444
    Keywords: Algorithm ; Control ; Intra-aortic balloon pump ; Optimisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract An optimal control system for the intra-aortic balloon pump (IABP) is presented. Control of the IABP is based on a performance index formulated to reflect a tradeoff between maximising cardiac oxygen supply and minimising cardiac oxygen consumption. In the performance index, mean diastolic pressure (MDP) was used to represent oxygen availability and peak systolic pressure (PSP) was used to represent oxygen consumption. An algorithm, implemented using an 8-bit microcomputer, changes the deflation time of the IABP to maximise this performance index by using an optimisation technique that employs both a search and an approximation. The search produces three equally spaced points which define a region that includes the maximum of the performance index. From these points, the optimum deflation time is estimated by a quadratic approximation. The algorithm has been successfully tested using performance index curves generated by computer simulations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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