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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 67 (1980), S. 569-569 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    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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  • 3
    ISSN: 1432-1912
    Keywords: Cardiac metabolism ; Myocardial ischemia ; Oxfenicine ; Oxygen debt ; Oxygen repayment ; Release of electrolytes and substrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Potential protective effects of oxfenicine [(S)-4-hydroxyphenylglycine] in ischemic stressed canine myocardium have been studied. This compound is characterized as a drug leading to metabolic inhibition of free fatty acid (FFA) metabolism. The drug (0.06 mmol·kg−1 body weight) caused no changes in hemodynamics or energy demand (Et) but depressed myocardial oxygen consumption (MVO2) by 11% (P〈0.02). Significant changes in FFA and lactate metabolism were observed: lactate extraction (EX) increased from 22.5–37.1 μmol/min, extraction ratio (EXR) from 16.5–30% and oxygen extraction ratio (OER) from 24.8–38%; EX of FFA decreased from 6900–5000 nmol/min, EXR from 48.2–31.4% and OER from 59.7–46.6%. Arterial concentrations of FFA and lactate remained unchanged. EX, EXR and OER of glucose were not affected under basic conditions. In the same collective, repeated ischemia (3 min) was produced by proximal occlusion of the left anterior descending artery (LAD). The efficiency of the drug was examined by (a) the amounts of ischemia metabolites released in the early reperfusion and (b) quantification of O2-debt and O2-repayment in the occlusion- and reperfusion periods. Compared to control occlusions, premedication led to a reduced O2-debt (P〈0.01) combined with a reduced amount of oxygen additionally taken up in the early reperfusion (P〈0.05). Furthermore, release of potassium increased (+7.1%; P〈0.05); release of lactate (-32%, P〈0.001) and inorganic phosphate (-34%, P〈0.01) decreased. These data give support to the concept that a pharmacologically induced shift of cardiac metabolism with reduction of FFA utilisation may be favourable in circumstances with limited oxygen supply.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 86 (1997), S. 1026-1032 
    ISSN: 1435-1285
    Keywords: Key words Balloon valvuloplasty – pulmonary stenosis – long term follow-up – adults ; Schlüsselwörter Ballonvalvuloplastie – Pulmonalstenose – Langzeitverlauf – Belastungsgradient – Erwachsene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Balloon valvuloplasty of pulmonary stenosis has become the treatment of choice in children and adults. This is a report about the long term results in adult patients. Forty-six patients (mean age 37 ± 17 years) with pulmonary stenosis were treated between 1984 and 1994 by this method. Thirty-four of 46 patients were re-examined 3 months to 9 years (mean 3.4 years) later by right heart catheterization and echocardiography. These 34 patients were representative for the whole group concerning age, severity of the pulmonary stenosis, and acute results after the intervention. The pressure gradient was acutely reduced by balloon valvuloplasty from 86 ± 35 to 38 ± 17 mm Hg (p 〈 0.0001) (n = 46) and was 32 ± 10 mm Hg (n.s.) (n = 34) at follow-up. Within 3 months after the intervention, 8 of 13 patients with a pressure gradient ≥ 100 mm Hg, showed spontaneously further reduction of the gradient due to the resolution of the subvalvular muscular hypertrophy. During a bicycle exercise test with 9 patients, the gradient rose significantly from 29 ± 10 to 53 ± 23 mm Hg (p 〈 0.01) as determined by right heart catheterization. All of these patients had normal cardiac output at rest and during exercise. None had signs of right ventricular hypertrophy in the electro- or echocardiogram. It is concluded that balloon valvuloplasty of pulmonary stenosis is the first line treatment in adults.
    Notes: Zusammenfassung Die Behandlung von valvulären Pulmonalstenosen mittels Ballondilatation ist heute die Therapie der Wahl im Kindes- und Erwachsenenalter. Wir berichten über das Dilatationsergebnis von 46 erwachsenen Patienten (mittleres Alter 37 ± 17 Jahre) mit Pulmonalstenose, die zwischen 1984 und 1994 mit diesem Verfahren behandelt worden sind. 34 von 46 Patienten wurden 3 Monate bis 9 Jahre (im Mittel 3,4 Jahre) nach Intervention mittels Rechtsherzkatheterisierung und Echokardiographie nachuntersucht. Diese 34 Patienten waren bezüglich Alter, Schwere der Pulmonalstenose und Akutergebnis nach Dilatation repräsentativ für das Gesamtkollektiv. Der maximale Druckgradient wurde durch Ballonvalvuloplastie akut von 86 ± 35 auf 38 ± 17 mm Hg (p 〈 0,0001) (n = 46) reduziert und war 32 ± 10 mm Hg (n.s.) (n = 34) zum Zeitpunkt der jeweils letzten Nachuntersuchung. 8 von 13 Patienten mit einem maximalen Druckgradienten ≥ 100 mm Hg zeigten eine weitere spontane Reduktion des Gradienten infolge Rückbildung einer subvalvulären muskulären Hypertrophie des rechten Ausflußtraktes innerhalb von 3 Monaten nach dem Eingriff. Eine fahrradergometrische Untersuchung im Liegen wurde bei 9 Patienten durchgeführt. Hierbei stieg der invasiv gemessene maximale Gradient signifikant von 29 ± 10 auf 52 ± 23 mm Hg (p 〈 0,01) an. Sämtliche Patienten hatten ein normales Herzzeitvolumen in Ruhe und unter Belastung. Keiner zeigte elektro- oder echokardiographisch die Zeichen einer rechtsventrikulären Hypertrophie. Die Ballonvalvuloplastie der valvulären Pulmonalstenose ist die Therapie der Wahl bei Erwachsenen.
    Type of Medium: Electronic Resource
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  • 5
    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
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