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Related Concept Videos

The Sympathetic Nervous System01:25

The Sympathetic Nervous System

Overview
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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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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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.
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Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions01:15

Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions

PK–PD modeling has significantly influenced FDA regulatory decisions, particularly drug approval, dosage optimization, and labeling. These models integrate pharmacokinetics (PK) and pharmacodynamics (PD) to predict drug behavior and effects, aiding in optimizing dosing regimens and enhancing the probability of clinical trial success.One notable example is Nesiritide (Natrecor®), a recombinant human brain natriuretic peptide for treating acute decompensated congestive heart failure (CHF).

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Related Experiment Video

Updated: Jul 13, 2026

Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
06:30

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Sympathetic modulation in practice: the German clinical experience.

W Kupper1, H H Erlemeier, W Bleifeld

  • 1Department of Cardiology, University Hospital Eppendorf, Hamburg, F.R.G.

European Heart Journal
|April 1, 1990
PubMed
Summary

Xamoterol, a beta 1-selective adrenoceptor partial agonist, improved exercise capacity in patients with mild to moderate heart failure. This study highlights its potential as a promising treatment option.

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Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Heart failure is a significant cardiovascular condition.
  • Beta-1 selective adrenoceptor partial agonists represent a therapeutic class for heart failure.

Purpose of the Study:

  • To evaluate the acute hemodynamic and neurohumoral effects of xamoterol in patients with ischemic heart failure.
  • To assess the efficacy and safety of xamoterol in mild to moderate heart failure through a pooled analysis of clinical trials.

Main Methods:

  • Acute hemodynamic assessment at rest and during exercise before and after xamoterol infusion.
  • Randomized, double-blind, placebo-controlled trial (German-Austrian Xamoterol Group study).
  • Pooled analysis of worldwide efficacy and safety data from large clinical studies.

Main Results:

  • Xamoterol acutely increased cardiac index and blood pressure at rest, and maintained cardiac index during exercise.
  • Xamoterol demonstrated a statistically significant improvement in exercise work done compared to placebo (14% vs 6% improvement over baseline).
  • Neurohumoral changes, including a tendency for plasma renin activity and noradrenaline to fall, were observed.

Conclusions:

  • Xamoterol exhibits favorable acute hemodynamic effects in ischemic heart failure.
  • Xamoterol is a promising new therapeutic agent for treating mild to moderate heart failure, showing significant improvements in exercise capacity.