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Related Experiment Videos

Morphological changes accompanying physiological changes in atrial stretch receptors

A M Earle, I H Zucker, A C Earle

    Basic Research in Cardiology
    |July 1, 1980
    PubMed
    Summary

    Left atrial stretch receptor activity normalized after resolving congestive heart failure in dogs. However, structural damage persisted in two-thirds of these receptors, indicating a link between receptor changes and function.

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    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Surgery
    • Histopathology

    Background:

    • Congestive heart failure (CHF) can alter cardiovascular reflexes.
    • Left atrial stretch receptors play a role in regulating cardiovascular function.
    • The long-term effects of CHF on atrial stretch receptors are not fully understood.

    Purpose of the Study:

    • To investigate the recovery of left atrial stretch receptor activity after resolution of surgically induced congestive heart failure.
    • To examine the histological changes in left atrial stretch receptors following a period of CHF.

    Main Methods:

    • Aorta-to-vena cava shunt created in six dogs to induce CHF.
    • Shunt ligation performed after CHF onset.
    • Left atrial stretch receptor activity recorded 6-7 weeks post-ligation.

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  • Histological examination of left atrial endocardium using methylene blue staining.

    • Main Results:

    • Hemodynamic and clinical signs of CHF developed after shunt creation.
    • Left atrial stretch receptor activity returned to normal levels observed in sham-operated dogs.
    • Approximately one-third of stretch receptors showed normal histology.
    • Two-thirds of receptors exhibited fragmentation and degeneration.

    Conclusions:

    • While physiological activity of left atrial stretch receptors recovers after CHF resolution, significant structural damage remains.
    • Structural alterations in left atrial stretch receptors appear to correlate with their functional recovery.
    • These findings suggest potential long-term consequences of CHF on cardiac mechanoreceptors.