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Dopamine-induced diuresis in the cat without changes in renal hemodynamics

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Summary

The effects of intravenous (i.v.) and intraarterial (i.a.) injection and infusion of dopamine (DA) on renal hemodynamics, regional sympathetic activity and kidney function were investigated in anaesthetized cats. In response to the i.v. bolus injection of DA (25 μg/kg), mean arterial blood pressure (MABP) was increased by 19.7%, renal blood flow (RBF) by 16.6%, and regional sympathetic discharges were inhibited. The principal effect of i.a. bolus injection of DA into the renal artery was vasoconstriction. Vasodilation was observed neither after lower doses of DA nor after pretreatment with phenoxybenzamine.

During continuous i.v. infusion of 10 μg DA kg−1 min−1 MABP, RBF, renal sympathetic discharges and glomerular filtration rate (GFR) did not change, whereas urine volume was increased by 120.5%, sodium excretion by 99.7%, chloride excretion by 143.2%, and potassium excretion by 31.9%. Urine osmolality was decreased and osmolal clearance increased. Raising the DA dose to 25 μg kg−1 min−1 resulted in a fall of GFR, but the diuretic response was not significantly different from that of the low dose. Bulbocapnine (6 mg/kg i.v.) antagonized the DA-induced diuresis.

In conclusion, the diuretic effect of DA in the cat is not dependent on a change in RBF, GFR or renal sympathetic activity. This suggests that a tubular site of action is primarily responsible for DA diuresis.

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Authors and Affiliations

  1. Institut für Pharmakologie und Toxikologie der Universität Bonn, Reuterstrasse 2b, D-5300, Bonn 1, Federal Republic of Germany

    K. Wassermann, R. Huss & R. Kullmann

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  1. K. Wassermann
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  2. R. Huss
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  3. R. Kullmann
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Wassermann, K., Huss, R. & Kullmann, R. Dopamine-induced diuresis in the cat without changes in renal hemodynamics. Naunyn-Schmiedeberg's Arch. Pharmacol. 312, 77–83 (1980). https://doi.org/10.1007/BF00502578

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  • DOI: https://doi.org/10.1007/BF00502578

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