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Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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The Inverted Heart Model for Interstitial Transudate Collection from the Isolated Rat Heart

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Plasma endothelin in chronic heart failure.

J J McMurray¹, S G Ray, I Abdullah

¹Department of Cardiology, Western Infirmary, Glasgow, UK.

|April 1, 1992

Summary

Patients with chronic heart failure (CHF) exhibit elevated circulating endothelin levels, a potent vasoconstrictor peptide. These increased endothelin concentrations in CHF may play a significant role in the condition's pathophysiology.

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Area of Science:

Cardiovascular Physiology
Endocrinology
Neuropeptide Research

Background:

Endothelins are newly identified peptides known for their vasoconstrictive properties.
Chronic heart failure (CHF) is associated with peripheral arteriolar and renal vasoconstriction.

Purpose of the Study:

To investigate plasma endothelin-like immunoreactivity levels in patients diagnosed with chronic heart failure (CHF).

Main Methods:

Measurement of peripheral venous plasma endothelin concentrations in patients with severe CHF and healthy volunteers.
Assessment of endothelin levels during exercise.
Correlation analysis with plasma atrial natriuretic factor, serum urea, and serum creatinine.
Evaluation of renal endothelin extraction.

Main Results:

Patients with severe CHF showed significantly higher plasma endothelin concentrations (12.4 +/- 0.6 pmol/l) compared to healthy controls (6.4 +/- 0.3 pmol/l).
Plasma endothelin levels did not change with exercise in either group.
No significant correlation was found between plasma endothelin and atrial natriuretic factor, urea, or creatinine in CHF patients.
Significant renal extraction of endothelin was observed in CHF patients.

Conclusions:

Circulating endothelin concentrations within the 5-40 pmol/l range are suggested to be vasoactive.
The elevated endothelin levels detected in patients with CHF likely hold pathophysiological significance for the syndrome.