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  • Deconvolution  (1)
  • Inert gas dilution method  (1)
  • Key words Patent ductus arteriosus – transvenous closure – Ivalon  (1)
  • 1
    ISSN: 1432-2013
    Keywords: Inert gas dilution method ; Deconvolution ; Circulatory transport function ; Indicator transit time ; Heterogeneity of myocardial blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following single breath inhalations of helium 49 simultaneous inlet-outlet pairs of helium dilution curves were recorded in seven dog experiments from the aortic and coronary sinus blood by use of mass spectrometric technique. After numeric deconvolution of the dilution curves the weighting function of tracer transit times was used for calculation of the mean myocardial blood flow per unit of tissue, which closely correlated with directly measured flow. Secondly, the degree of blood flow heterogeneity was estimated from the first moments of the weighting function of transit times and by compartmental analysis based on an inverse Laplace transform. In the intact heart the results suggest a rather constant dispersion of flows relative to the mean flowFF in the order of σ/FF=0.3. The apparent dispersion of flows is increased by α-adrenergic stimulation with pressure and volume load, particularly in a state of β-blockade, a finding, which may be attributed to variations of intercapillary distances and to a heterogeneity of blood flow per unit of tissue.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1285
    Keywords: Key words Patent ductus arteriosus – transvenous closure – Ivalon ; Schlüsselwörter Persistierender Ductus arteriosus – transvenöser Verschluß– Ivalon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary An Ivalon-plug (PDA-plug) has been developed for transvenous closure of patent ductus arteriosus. It can be introduced into the ductus through standard venous sheaths with a diameter von 8–16 French. The plug is fixed in its target position by means of four distal (aortal) and two proximal (pulmonary) nitinol struts. In case of malpositioning the system can be pulled back into and retrieved through the sheath. In animal experiments endothelialization of the implanted material was demonstrated. PDA-closure was attempted in 58 patients; the procedure was successful in 57 cases; a residual ductal flow was present in eight patients. During a follow-up of up to 24 months there were no complications.
    Notes: Zusammenfassung Es wurde ein Ivalonpfropf (PDA-Plug) zum transvenösen Verschluiß des persistierenden Ductus arteriosus entwickelt. Er kann durch Standardschleusen vom Kaliber 8–16 French in den Ductus eingeführt werden. Mit 4 distalen (aortalen) und 2 proximalen (pulmonalen) Nitinol-Federbeinchen wird das System im Ductus fixiert. Bei Fehlplazierung kann der Propf in die Schleuse zurückgezogen und entfernt werden. In Tierexperimenten wurde eine Endothelialisierung des implantierten Materials nachgewiesen. Bisher wurde bei 58 Patienten ein Ductusverschluß versucht; in 57 Fällen gelang der Eingriff, ein Residualshunt war bei 8 Patienten nachweisbar. Im Verlauf von bis zu 24 Monaten traten keine Komplikationen auf.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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