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Related Concept Videos

Adrenergic Neurons: Neurotransmission01:27

Adrenergic Neurons: Neurotransmission

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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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Adrenergic Receptors: β Subtype01:26

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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
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Adrenergic Agonists: Indirect-Acting Agents01:25

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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
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Adrenergic Agonists: Direct-Acting Agents01:30

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Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Related Experiment Video

Updated: Dec 20, 2025

Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Ventricular myocardial catecholamines in primates.

G L Pierpont, E G DeMaster, S Reynolds

    The Journal of Laboratory and Clinical Medicine
    |August 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    This study measured myocardial catecholamine levels in primate ventricles. Norepinephrine was highest at the base, with dopamine and epinephrine present in lower, consistent concentrations, offering insights into human cardiac catecholamine levels.

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    Area of Science:

    • Cardiovascular Physiology
    • Neuroendocrinology

    Background:

    • Catecholamines, such as norepinephrine, dopamine, and epinephrine, play crucial roles in cardiac function.
    • Understanding normal myocardial catecholamine concentrations is essential for interpreting disease-related changes.

    Purpose of the Study:

    • To quantify myocardial catecholamine levels in primate ventricles.
    • To establish a baseline for normal catecholamine concentrations in the heart.
    • To investigate the distribution and ratios of catecholamines within the primate ventricle.

    Main Methods:

    • High-performance liquid chromatography with electrochemical detection was used to assay catecholamine levels.
    • Samples were obtained from the left ventricles of 11 non-human primates (rhesus and cynomolgus monkeys).
    • Catecholamine concentrations were measured and analyzed for gradients and inter-animal variability.

    Main Results:

    • Norepinephrine was the most abundant catecholamine in primate left ventricles (1391 +/- 362 ng/gm), showing a gradient from base to apex.
    • Dopamine (51.8 +/- 24.5 ng/gm) and epinephrine (59.2 +/- 20.0 ng/gm) were present in significantly lower concentrations.
    • The dopamine/norepinephrine ratio was consistent within individual animals, averaging 3.7% +/- 1.4%.

    Conclusions:

    • Primate myocardial catecholamine levels, particularly norepinephrine, exhibit a distinct base-to-apex gradient.
    • The consistent dopamine/norepinephrine ratio suggests a regulated physiological relationship.
    • These findings provide valuable reference values for normal human myocardial catecholamine concentrations and aid in disease studies.