Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-1440
    Keywords: Coronary occlusion ; epicardial mapping ; infarction size ; fibrinolysis ; Streptokinase ; fibrinogen degradation products ; Coronarocclusion ; epicardiales EKG ; Infarktgröße ; Fibrinolyse ; Streptokinase ; Fibrinogen-Spaltprodukte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 17 narkotisierten Hunden wurden mehrere Seitenäste des Ramus descendens der linken Kranzarterie unterbunden. Die ST-Segmentelevation im epikardial abgeleiteten EKG stieg dabei bis auf 22 mV nach 5 min und 19 mV nach 20 min an. Aortendruck, enddiastolischer Druck im linken Ventrikel, Herzfrequenz und die hämostasiologischen Parameter (Plasmathrombinzeit, Thrombinkoagulasezeit, Reptilasezeit, Plasmafibrinogen, Staphylokokken-Clumping-Test) änderten sich nicht. 20 min nach Beginn der Okklusion wurden die Gefäße geöffnet. Nachdem sich die St-Segmenthebung zurückgebildet hatte, wurde eine kontrollierte Fibrinolyse (Streptokinase 1,5 Mega I.E. in 30 min initial, Fortführung mit 0,75 Mega I.E./h) eingeleitet. Wenn die hämostasiologischen Parameter eine effektive Lyse anzeigten, wurden die gleichen Gefäße erneut unterbunden. Auch jetzt änderten sich die hämodynamischen Größen nicht wesentlich. Die ST-Segment-Elevation war jedoch signifikant um 50% geringer als nach einfacher Ligatur. Eine Kontrollgruppe, die nur das Lösungsmittel der Streptokinase erhielt, zeigte dagegen einen unveränderten Anstieg der ST-Streckenelevation. Die Wirkung der Streptokinase wird auf das Auftreten von Fibrinogen-Spaltprodukten und die Senkung des Fibrinogenspiegels zurückgeführt, die eine Verbesserung der Mikrozirkulation hervorrufen.
    Notes: Summary In 17 unaesthetized dogs several side branches of the left descending coronary artery were ligated. The ST-segment elevation in the epicardial ECG ascended to 22 mV after 5 min and to 19 mV after 20 min. Aortic pressure, left ventricular enddiastolic pressure, heart rate and hemostasiological parameters (thrombin-time, thrombin-coagulase-time, reptilase-time, plasma-fibrinogen, staphylococcal clumping test) did not change significantly. 20 min after the beginning of coronary occlusion, the vessels were reopened. When ST-segment elevation had disappeared, a controlled fibrinolytic therapy (Streptokinase 1.5 Mega I.E. in 30 min, later on 0.75 Mega I.E./h) was induced. When an effective fibrinolysis could be demonstrated by the hemostasiological parameters, the same vessels were occluded again. Now the hemodynamic parameters too did not change significantly, but the ST-segment elevation was significantly diminished for more than 50% compared with simple ligation. A control group, which only got the solvent of the streptokinase, showed the same ST-segment elevation. This effect, induced by streptokinase is ascribed to fibrinogen degradation products and a diminution in the amount of fibrinogen which cause an improvement of microcirculation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 70 (1975), S. 198-208 
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of 0.1 mg/kg Verapamil on the extent of the ischemic area following ligation of a branch of the left descending coronary artery was studied in anaesthetized open chest dogs. The sum of the ST-segment elevation during the entire period of occlusion in the epicardial ECG was 15 mV in control infarction compared to 9 mV (p〈0.0005) when Verapamil was infused after ligation. Mean flow in the left descending coronary artery was reduced by coronary ligation alone on the average by 23%, but augmented by Verapamil for 5% above pre-occlusion control flow. Corresponding to the rise in the coronary flow and the drop in perfusion pressure under the influence of Verapamil, the increase of left coronary artery resistance induced by coronary occlusion was diminished. The positive effect of Verapamil on the size of myocardial infarction as estimated from the epicardial ST-segment changes is probably not induced by coronary vasodilatation, but by the Ca-antagonizing effect of this drug, as described by other authors.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...