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Regional differences in adrenergic function within the left ventricle.

G L Pierpont, E G DeMaster, J N Cohn

    The American Journal of Physiology
    |June 1, 1984
    PubMed
    Summary
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    Myocardial norepinephrine (NE) content varies significantly across the left ventricle, showing a gradient from apex to base. This suggests regional differences in adrenergic supply and activity, potentially impacting ischemic heart disease response.

    Area of Science:

    • Cardiology
    • Neuroscience
    • Physiology

    Background:

    • Ischemic heart disease (IHD) presents heterogeneously.
    • The heart's adrenergic response to ischemia may vary based on regional adrenergic supply.

    Purpose of the Study:

    • To quantify myocardial norepinephrine (NE) content in different regions of the left ventricle (LV).
    • To investigate the distribution pattern of NE in the canine myocardium.
    • To assess the implications for adrenergic activity in IHD.

    Main Methods:

    • High-pressure liquid chromatography with electrochemical detection was used to measure NE content.
    • Tissue samples were collected from 54 sites in the canine LV.
    • Myocardial uptake of radiolabeled NE and epinephrine was assessed in separate experiments.

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    Main Results:

    • Significant regional variations (up to 10-fold) in NE content were observed within a single LV.
    • A consistent apex-to-base gradient of NE distribution was identified (apex: 162 ng/g, base: 844 ng/g).
    • No significant epicardial-to-endocardial gradient was found.
    • Myocardial uptake patterns mirrored NE content distribution.

    Conclusions:

    • Regional differences in myocardial NE content indicate varying adrenergic supply and activity levels.
    • These findings suggest that adrenergic activity is not solely dependent on stored NE pools.
    • The observed pattern in dogs may be applicable to humans, with implications for understanding IHD.