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Systemic and regional vascular effects of atrial natriuretic peptide in a rat model of chronic heart failure

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Summary

To characterize the systemic and regional vascular effects of atrial natriuretic peptide (ANP) in chronic heart failure, central hemodynamics, regional blood flow and plasma ANP levels were determined in a rat model of myocardial infarction and failure and in sham-operated animals. Measurements were made in the conscious state before and after intravenous rANP [99-126] (8 μg bolus followed by continuous infusion of 1.0 μg/kg/min). With this protocol, ANP significantly decreased cardiac output, right atrial, left ventricular enddiastolic and arterial pressures and there were increases in heart rate, systemic and intestinal vascular resistances in sham animals. Renal blood flow per gram of tissue was unchanged with ANP, but when expressed as a percentage of cardiac output, increased significantly, indicating a preferential renal vasodilatory effect of ANP. In rats with infarction and failure, this dose did not alter cardiac output or arterial pressure, but decreased right atrial and left ventricular blood flow. Although significantly reduced as compared to the control group, renal blood flow was not improved with ANP in the heart failure group. ANP plasma levels of the heart failure group were elevated at baseline (p<0.01), and increased 5–10 times after infusion of rANP. Thus, in rats with chronic heart failure, the renal vascular effects of ANP are blunted, which may, in part, explain the failure of ANP to restore the altered volume homeostasis in heart failure despite elevated ANP plasma levels. However, the effects on venous return were preserved which, in turn, improved cardiac performance via a reduction of preload.

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  1. H. Drexler

    Present address: Medizinische Klinik III, University of Freiburg, Hugstetter Straße 55, 7800, Freiburg, F.R.G.

Authors and Affiliations

  1. Medizinische Klinik III, University of Freiburg, Hugstetter Straße 55, 7800, Freiburg, F.R.G.

    M. Finkh, S. Höing & H. Just

  2. Pharmakologisches Institut, University of Heidelberg, F.R.G.

    M. Toth & R. E. Lang

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  1. H. Drexler
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  2. M. Finkh
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  4. M. Toth
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  5. H. Just
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Supported by the Deutsche Forschungsgemeinschaft (DFG, Dr 148/3-1)

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Drexler, H., Finkh, M., Höing, S. et al. Systemic and regional vascular effects of atrial natriuretic peptide in a rat model of chronic heart failure. Basic Res Cardiol 82, 517–529 (1987). https://doi.org/10.1007/BF01907221

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  • DOI: https://doi.org/10.1007/BF01907221

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