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Coronary flow in a perfused rainbow trout heart.

The Journal of Experimental Biology

|May 1, 1987

Summary

Researchers developed a method to study trout hearts, finding that coronary resistance increases as flow decreases and is affected by temperature and heart rate. Adrenaline

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Editorial July 2018.

Journal of fish biology·2018

Area of Science:

Cardiovascular physiology
Comparative physiology
Fish biology

Background:

Understanding coronary circulation in non-mammalian vertebrates is crucial for comparative physiology.
Rainbow trout (Salmo gairdneri Richardson) hearts offer a model for studying cardiac function under varying physiological conditions.

Purpose of the Study:

To develop a preparation for perfusing the coronary circulation of working rainbow trout hearts.
To investigate the pressure-flow relationships in the coronary circulation under different work loads.
To determine the influence of cardiac metabolism, acclimation temperature, and heart rate on coronary resistance.

Main Methods:

Developed a novel preparation for perfusing the coronary circulation of isolated, working rainbow trout hearts.
Applied physiological and subphysiological work loads to the heart.
Measured coronary flow rate and pressure to determine coronary vascular resistance.
Administered adrenaline to assess direct vasoconstriction effects.
Varied acclimation temperature and heart rate.

Main Results:

Coronary vascular resistance demonstrated an exponential increase as coronary flow rate decreased.
Cardiac metabolism and acclimation temperature significantly influenced coronary resistance.
Increased heart rate led to elevated extravascular compression, impacting coronary resistance.
Adrenaline-induced coronary vasoconstriction was found to be temperature-dependent.

Conclusions:

The developed preparation effectively allows for the study of coronary circulation in working trout hearts.
Coronary resistance in rainbow trout is a complex function of flow, cardiac work, temperature, and extravascular factors.
Temperature plays a critical role in modulating both basal coronary resistance and the response to vasoconstrictive agents like adrenaline.

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