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Related Concept Videos

Heart Failure Drugs: β-Blockers01:22

Heart Failure Drugs: β-Blockers

β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation, vasodilation, and...
Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers01:27

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in bronchial smooth...
Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers01:25

Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers

β-adrenergic antagonists, or β-blockers, modulate the sympathetic nervous system by targeting β-adrenoceptors and inhibiting catecholamine-mediated sympathetic responses. β-blockers differ in their adrenoceptor subtype affinity, lipophilicity, and α-blocking capabilities. The history of β-blocker development began with the prototype, dichloroisoprenaline, which exhibited partial agonist activity. As a result, propranolol was developed as a pure antagonist but nonselective agent, paving the way...
Antihypertensive Drugs: Action of β1 Blockers01:17

Antihypertensive Drugs: Action of β1 Blockers

β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...

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Related Experiment Video

Updated: Jun 27, 2026

Cardiac Stress Test Induced by Dobutamine and Monitored by Cardiac Catheterization in Mice
15:45

Cardiac Stress Test Induced by Dobutamine and Monitored by Cardiac Catheterization in Mice

Published on: February 10, 2013

[Autonomic dysfunction and beta-adrenergic blockers in multiple organ dysfunction syndrome].

R Hennen1, I Friedrich, D Hoyer

  • 1Universitätsklinik und Poliklinik für Innere Medizin III, Martin-Luther-Universität Halle-Wittenberg.

Deutsche Medizinische Wochenschrift (1946)
|November 21, 2008
PubMed
Summary
This summary is machine-generated.

Beta-adrenergic blockers (BAB) may improve survival in patients with multiple organ dysfunction syndrome (MODS). This benefit is particularly notable in MODS triggered by ischemia, suggesting BABs reduce autonomic dysfunction and inflammation.

Related Experiment Videos

Last Updated: Jun 27, 2026

Cardiac Stress Test Induced by Dobutamine and Monitored by Cardiac Catheterization in Mice
15:45

Cardiac Stress Test Induced by Dobutamine and Monitored by Cardiac Catheterization in Mice

Published on: February 10, 2013

Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Pharmacology

Context:

  • Multiple organ dysfunction syndrome (MODS) is a critical condition with high mortality.
  • Autonomic dysfunction, specifically sympathetic-parasympathetic imbalance, is implicated in MODS.
  • Beta-adrenergic blockers (BABs) influence the autonomic nervous system.

Purpose:

  • To investigate the impact of beta-adrenergic blockers (BABs) on the survival of patients with multiple organ dysfunction syndrome (MODS).
  • To explore the association between BABs, autonomic dysfunction, and heart rate variability (HRV) in MODS patients.

Summary:

  • Retrospective analysis of 157 MODS patients revealed that 69 received BABs.
  • BAB treatment was linked to significantly higher survival probability (HR 0.4, p=0.001).
  • Survival benefit was pronounced in ischemically triggered MODS, with reduced HRV in the BAB group.

Impact:

  • Beta-adrenergic blockers may offer a survival advantage for MODS patients, especially those with ischemic triggers.
  • BABs are associated with less autonomic dysfunction, potentially mitigating inflammatory responses in MODS.
  • Findings support further investigation into BABs as a therapeutic strategy for MODS.