Zusammenfassung
An fünf wachen, trainierten Hunden mit Carotisschlinge wurde die Wirkung kleiner intracarotidialer Wasserinfusionen auf die Harnausscheidung untersucht. Die Infusionsgeschwindigkeiten betrugen 3,0, 2,5 und 2,0 ml/min. Während einer Infusionszeit von 30 min wurden also insgesamt 90, 75 bzw. 60 ml Wasser injiziert. Als Kontrollversuch dienten entsprechende Infusionen in eine periphere Vene.
Eine Diurese trat nur mit intracarotidialer Infusion ein. Dies spricht zugunsten einer zentralen Lokalisation der verantowrtlichen Osmoreceptoren. Die Größe der Diurese war eine Funktion der infundierten Wassermenge. Sie beruhte ausschließlich auf einer Erhöhung der Freiwasserclearance. Die Exkretion der Elektrolyte und die osmotische Clearance blieben unverändert. Diese Befunde können am besten über den ADH-Mechanismus erklärt werden.
Summary
In five unanaesthetized trained dogs the effect of injection of small quantities of water into a carotid loop on the excretion of urine was investigated. The infusion rates were 3.0, 2.5 and 2.0 ml/min. Infusion time was 30 min, so that a total of 90, 75 and 60 ml of water was injected. As controls, identical water infusions were made into a peripheral vein. The following results were obtained:
Diuresis occurred only with intracarotid infusions. This speaks in favour of a central location of osmoreceptors. The diuresis was a function of the amount of water infused and was due solely to an increase in free water clearance. The excretion of electrolytes and the osmotic clearance remained unchanged. These findings can best be explained by the ADH mechanism.
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To Professor Max Schneider on his 60th birthday.
With 4 Figures in the Text
A preliminary report of this work was given at the 28th meeting of the Deutsche Physiologische Gesellschaft [Pflügers Arch. ges. Physiol. 278, 51 (1963)].
This research was conducted under the sponsorship of the Deutsche Forschungsgemeinschaft and Grant No. AF EOAR 62–75 U.S. Airforce, Brussels Office.
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Arndt, J.O., Gauer, O.H. Diuresis induced by water infusion into the carotid loop of unanaesthetized dogs. Pflügers Arch. 282, 301–312 (1965). https://doi.org/10.1007/BF00412505
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DOI: https://doi.org/10.1007/BF00412505