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Related Concept Videos

Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

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Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
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Adrenergic Neurons: Neurotransmission01:27

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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.
Synthesis: Catecholamine synthesis requires tyrosine, which...
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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
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
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Blood Pressure Imbalances and Circulatory Shock01:24

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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
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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.
These agents can be classified...
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Adrenergic Receptors: ɑ Subtype01:31

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Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
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Related Experiment Video

Updated: Mar 25, 2026

Rodent Working Heart Model for the Study of Myocardial Performance and Oxygen Consumption
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Catecholamines for inflammatory shock: a Jekyll-and-Hyde conundrum.

Davide Tommaso Andreis1,2, Mervyn Singer3

  • 1Division of Medicine, Bloomsbury Institute of Intensive Care Medicine, University College London, Gower St, London, WC1E 6BT, UK. davide.andreis@unimi.it.

Intensive Care Medicine
|February 14, 2016
PubMed
Summary
This summary is machine-generated.

Catecholamines are vital for homeostasis but can harm patients in critical illness when used in excess. This review examines their dual role and explores safer alternatives for hemodynamic support.

Keywords:
CatecholaminesCritical illnessEpinephrineNorepinephrinePathophysiologyPhysiologySepsis

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Area of Science:

  • Critical care medicine
  • Pharmacology
  • Physiology

Background:

  • Catecholamines are crucial endogenous mediators and hormones for homeostasis.
  • Synthetic catecholamines are mainstays in treating shock, addressing myocardial depression and vasoplegia.
  • Pathological states involve decreased adrenoreceptor sensitivity and adrenergic signaling, leading to hyporeactivity.

Purpose of the Study:

  • To explore the dual 'Jekyll-and-Hyde' nature of catecholamines in critical illness.
  • To review catecholamine physiology and their wide-ranging effects on bodily systems.
  • To discuss potential alternatives for hemodynamic support and adrenergic modulation.

Main Methods:

  • Literature review of catecholamine physiology.
  • Analysis of catecholamine's pleiotropic effects on immune, metabolic, and coagulation pathways.
  • Exploration of alternative hemodynamic support strategies.

Main Results:

  • Catecholamines are necessary for survival but detrimental in excess due to supraphysiological dosing.
  • Adrenergic agents can cause direct organ damage and unmonitored 'off-target' effects.
  • Detrimental consequences of catecholamines may negatively impact patient outcomes.

Conclusions:

  • Catecholamines present a complex balance between necessity and harm in critical care.
  • Understanding their multifaceted effects is key to optimizing patient management.
  • Further research into safer alternatives for hemodynamic support is warranted.