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Sympathetic Activation01:17

Sympathetic Activation

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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...
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Disorders of the Autonomic Nervous System01:18

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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.
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Autonomic Nervous System01:22

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
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Sympathetic Signaling01:32

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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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The sympathetic division of the autonomic nervous system (ANS) plays a crucial role in preparing the body for stress, physical activity, and increased energy demands. This division activates the "fight-or-flight" response, enabling individuals to respond effectively to challenging situations.
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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Rapid responses of catecholamines, natriuretic peptides and inflammatory markers to acute type B aortic dissection (NeuroendOcrine horMone release in acute type b Aortic Dissection [NOMAD] Study).

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Sympathetic Nerve Activity following Acute Type B Aortic Dissection: A Pilot Study.

Eric T A Lim1,2, David Jardine3, Christopher Frampton3

  • 1Department of Vascular, Endovascular and Transplant Surgery, Christchurch Hospital, Christchurch, New Zealand.

Journal of Vascular Research
|December 29, 2024
PubMed
Summary

Sympathetic nerve activity (MSNA) is elevated in the acute phase of type B aortic dissection, returning to normal levels after 3 months. Early sympatholytic treatment may be crucial for preventing complications.

Keywords:
Aortic dissectionHypertensionMuscle sympathetic nerve activityNormetanephrineSympathetic nervous system

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Area of Science:

  • Cardiovascular Medicine
  • Nephrology
  • Vascular Surgery

Background:

  • Blood pressure control after acute type B aortic dissection typically involves sympatholytic antihypertensive medication.
  • The specific role of sympathetic nerve activity in the hypertensive response to acute aortic dissection remains unassessed.

Purpose of the Study:

  • To assess sympathetic nerve activity (MSNA) and plasma catecholamine levels in patients with acute type B aortic dissection.
  • To compare these levels with healthy controls during the acute and recovery phases of the condition.

Main Methods:

  • A prospective pilot study involving 5 patients with acute type B aortic dissection and 4 controls over 18 months.
  • Measurements included blood pressure, heart rate, muscle sympathetic nerve activity (MSNA), and plasma catecholamine levels.
  • Comparisons were made at 1 week (acute phase) and 3 months (recovery phase) post-dissection.

Main Results:

  • Muscle sympathetic nerve activity (MSNA) was significantly higher in patients during the acute phase (62 bursts/min vs. 46 bursts/min).
  • Plasma normetanephrine levels were also elevated in the acute phase (821.0 pmol/L vs. 417.0 pmol/L).
  • These elevated levels resolved towards control values by the 3-month recovery phase.

Conclusions:

  • Sympathetic nerve activity is acutely increased in the first week following type B aortic dissection.
  • This heightened activity resolves by 3 months post-dissection.
  • Immediate sympatholytic treatment is likely critical for preventing acute and chronic complications, potentially offering benefits beyond blood pressure reduction.