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  • 1
    ISSN: 0928-4680
    Keywords: Heart ; Hypertrophy ; Ischemia ; Isoprenaline ; Reperfusion ; [abr] ADP; adenosine diphosphate ; [abr] AMP; adenosine monophosphate ; [abr] ATP; adenosine triphosphate ; [abr] CF; coronary flow ; [abr] HH; hypertrophied heart ; [abr] HW/BW; heart weight to body weight ratio ; [abr] LVP; left ventricular systolic pressure ; [abr] NH; normal heart ; [abr] SAN; sum of adenine nucleotides ; [abr] VO"2; oxygen consumption ; [abr] dp/dt"m"a"x; maximal rate of increase in left ventricular
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0928-4680
    Keywords: Heart ; Hypertrophy ; Ischemia ; Isoprenaline ; Reperfusion ; [abr] ADP; adenosine diphosphate ; [abr] AMP; adenosine monophosphate ; [abr] ATP; adenosine triphosphate ; [abr] CF; coronary flow ; [abr] HH; hypertrophied heart ; [abr] HW/BW; heart weight to body weight ratio ; [abr] LVP; left ventricular systolic pressure ; [abr] NH; normal heart ; [abr] SAN; sum of adenine nucleotides ; [abr] VO"2; oxygen consumption ; [abr] dp/dt"m"a"x; maximal rate of increase in left ventricular
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-2451
    Keywords: Liver surgeryv ; Regional perfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Leber des Hundes wurde von der Gefäßversorgung abgeriegelt, mit Hilfe eines neu entwickelten Kathetersystems und eines Perfusionsaggregates 1 h normotherm und in Rezirkulation perfundiert. Kreislaufparameter, Blutgasanalysen und Gewebsgehalte der Stoffwechselmetabolite wurden zur Beurteilung der Methode herangezogen. Das venöse Blut aus der unteren Körperhälfte und dem portalen Stromgebiet (1,113 l/min) konnten über das Kathetersystem zum Herzen zurückgeführt werden, so daß der mittlere arterielle Systemdruck im Normbereich blieb. Bei einem Perfusionsfluß durch die Leber von 0,55 ml/min/g und einem Perfusionsdruck von 10 cm H2O war eine ausreichende Sauerstoffzufuhr gewährleistet, welcher auch in den Blutgasanalysen und in den Stoffwechseluntersuchungen zum Ausdruck kam. Mit der Anwendung einer Farbstoffverdünnungsmethode wurde die Kreislaufisolierung der Leber geprüft; dabei waren lediglich Leckmengen von 6–7% des gesamten Perfusionskreislaufvolumens festzustellen. Das neue Verfahren ermöglicht eine einstündige, normotherme, isolierte Leberperfusion ohne das gesunde Gewebe irreversibel zu schädigen.
    Notes: Summary The canine liver was isolated from its blood supply and perfused for one hour normothermically by means of a new catheter and a perfusion system consisting of oxygenator, pump and heat-exchanger. Hemodynamic parameters, blood gas analyses, and tissue metabolites were evaluated during the experiments. The venous return from the lower body and portal vein (1.113 1/min) could be maintained with the catheter system so that the mean systemic arterial pressure was within normal limits. With a perfusion rate through the liver of 0,55 ml/min/g and perfusion pressure of 10 cm H2O there was an adequate tissue perfusion; this was also shown by blood gas analyses and tissue metabolite concentrations. Using dye dilution methods the isolation of the liver was tested. This showed a leakage of 6–7% of the total perfusion volume. This new method makes it possible to carry out an isolated, normothermic, liver perfusion for one hour without irreversible tissue damage.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-8580
    Keywords: Regional perfusion ; Dye dilution ; Leakage monitoring ; Regionale Perfusion ; Farbstoffverdünnung ; Leckbestimmung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Im Tierexperiment am Hund (n = 13) prüften wir die Anwendung des Farbstoffes Evans blau als Indikator zur Kontrolle der Kreislaufisolierung einer Extremität während regionaler Perfusion. Nach i.v. Gabe von 0,1 ml/kg Körpergewicht einer 0,5%igen Evans-Blau-Lösung in den Körperkreislauf bestimmten wir die Plasmakonzentration des Farbstoffes mittels eines Spektralsphotometers. Wir ermittelten das Plasmavolumen (5,5 ml/100 g Körpergewicht) und die Eliminationsgeschwindigkeit des Farbstoffes (10%/h). Im zweiten Arbeitsansatz wurde nach Anschluß der versorgenden Gefäße der Extremität an eine extracorporale Kreislaufeinheit, bestehend aus Rollerpumpe, Oxygenator und Wärmeaustauscher, die Kreislaufisolierung der Extremität geprüft und die Situation eines Lecks nachgeahmt. Mit dieser modifizierten Farbstoffverdünnungsmethode war es uns möglich, „Shunt-Mengen“ von 1% des extracorporalen Kreislaufvolumens nachzuweisen. Bei der verwendeten Farbstoffkonzentration ergaben sich keine Hinweise für Toxizität. Das im Tierexperiment standardisierte Verfahren verwendeten wir bei 132 Patienten während regionaler hyperthermer Perfusion der Extremitäten. Bei 20 Patienten bestimmten wir ein Leck von weniger als 5%, bei 104 Patienten 5–10%, bei acht Patienten ein Leck von 10–20% des extracorporalen Kreislaufvolumens. Die Vorteile dieser Methode sind die einfache Handhabung, die fehlende Toxizität und Strahlenbelastung und der geringe finanzielle Aufwand.
    Notes: Summary In experiments on dogs (n = 13) we tested a procedure for estimating leakage during regional perfusion of the extremity by means of a dye dilution method. After systematic application of 0.5% Evans blue solution (0.1 ml/kg b.w.) we measured the dye concentration in plasma by means of a spectral photometer. The plasma volume (5.5 ml/100 g b.w.) and the disappearance rate of the dye (10%/h) were calculated. In a second procedure the supplying artery and vein of the extremity were proximally clamped and distally connected to an extracorporeal circulation unit consisting of oxygenator, pump, and heat exchanger, and the isolation of the extremity was tested. By simulation of leakage it was possible to detect a little amount of shunt of about 1% escaping from isolated region into the systemic circulation. There were no hints to toxicity when the same dye concentration was applied. The standardized method was used during 132 cytostatic hyperthermic perfusions in man. In 20 patients we determined shunts of less than 5%, in 104 patients shunts between 5 and 10%, and in eight patients shunts of 10–20% of the extracorporeal circulation. The benefits of the described method are simplicity to carry out and missing of toxicity or radiation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 187 (1987), S. 1-8 
    ISSN: 1433-8580
    Keywords: Regional perfusion ; Miniature equipment ; In vitro experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A simple, reliable and efficient miniaturized extracorporeal circulation system for the use in small animals, especially for the perfusion of rat hind limbs, has been described. The system consists of a newly devised bubble oxygenator and heat exchanger and of commercially available roller pumps, polyethylene cannulas and silicone tubes. The minimal and maximal priming volume of the entire system is 4.7 and 16.7 ml, respectively. The efficiency of the system is reflected in a high value of oxygen uptake in the range of 0.061 ml O2·min−1·ml−1 blood, a heat transfer coefficient ranging from 0.96 to 0.31 at flow rates between 1 and 20 ml·min−1, a low pulsation amplitude of the roller pump, a constant flow resistance at the arterial cannula, which implies optimal flow conditions, and in a low blood trauma with plasma hemoglobin concentrations of 47.5 ± 5mg dl−1 after 60min of in vitro perfusion.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 184 (1984), S. 115-123 
    ISSN: 1433-8580
    Keywords: Regional perfusion ; Hyperthermia ; Muscular metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In experiments with dogs (n=43), we studied the influence of different temperatures on the hind leg subjected to an isolated perfusion over a period of 1 and 2 h. The main supplying vessels of a hind leg were clamped, cannulated, and connected to an extracorporeal circulation unit which consisted of a roller pump, an oxygenator, and a heat exchanger. Whole blood was used for the regional perfusion at a flow rate of 10 ml·min−1·100 g−1 of tissue. Intramuscular (i.m.) temperatures were set at 38°, 40°, 42°, and 43.5°C, respectively. The perfusion pressure, the osmotic resistance of the erythrocytes and the metabolic status in specimens of skeletal muscle obtained at the end of the perfusion period or after an 8-day follow-up observation served as parameters. A perfusion of 1 and 2 h at temperatures of up to 42°C did not result in alterations of the energy metabolism. When the i.m. temperature was raised to 43.5°C, a significant decrease in muscular high-energy compounds and an accumulation of lactate occurred. Only under this condition was there a rise in the perfusion pressure and a drastic reduction in the blood pH value in the venous line of the extracorporeal circulation. Acidosis and hyperthermia of 43.5°C produced a marked reduction in the osmotic resistance of the erythrocytes.
    Type of Medium: Electronic Resource
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