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Related Experiment Videos

Diffusional shunting in the canine myocardium

A C Roth, E O Feigl

    Circulation Research
    |April 1, 1981
    PubMed
    Summary

    This study found evidence of a diffusional shunt in the heart. This arterial-venous pathway in the myocardium may influence oxygen delivery and carbon dioxide removal.

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    Area of Science:

    • Cardiovascular Physiology
    • Myocardial Metabolism

    Background:

    • The existence of diffusional shunts in the myocardium has been hypothesized.
    • Understanding these shunts is crucial for comprehending myocardial gas exchange.

    Purpose of the Study:

    • To investigate the presence of a diffusional shunt in the myocardium.
    • To determine the physiological implications of such shunts on cardiac function.

    Main Methods:

    • Experiments were conducted on anesthetized dogs with controlled coronary blood flow.
    • Indicators including hydrogen, indocyanine green-dyed plasma, and 99mTc-labeled red blood cells were injected into the coronary artery.
    • Coronary sinus venous appearance times of these indicators were measured to detect shunting.

    Main Results:

    • At low coronary flow rates, hydrogen appeared in the coronary sinus before intravascular indicators, suggesting an extravascular shunt.
    • This hydrogen precocity decreased with increasing coronary flow.
    • The difference in appearance times correlated linearly with coronary flow, supporting the concept of diffusional shunting.

    Conclusions:

    • The study provides evidence for arterial-venous shunting of hydrogen in the myocardium.
    • Diffusional shunting may play a significant role in the heart's ability to deliver oxygen and remove carbon dioxide.

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