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Related Concept Videos

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...
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Adrenergic Agonists: Therapeutic Uses

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

Adrenergic Neurons: Neurotransmission

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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Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...
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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Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.

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Central hyperadrenergic state after lightning strike.

Ajay K Parsaik1, J Eric Ahlskog, Wolfgang Singer

  • 1Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
|June 14, 2013
PubMed
Summary
This summary is machine-generated.

Lightning strikes can cause autonomic dysfunction, including persistent sinus tachycardia and autonomic storms. These complications may be linked to central nervous system effects or secondary responses following the electrical injury.

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Area of Science:

  • Neurology
  • Emergency Medicine
  • Physiology

Background:

  • Lightning strikes are rare but can cause significant and diverse medical complications.
  • Autonomic nervous system dysfunction is an under-recognized consequence of electrical injuries.

Observation:

  • A case report details a 24-year-old male struck by lightning.
  • The patient presented with persistent inappropriate sinus tachycardia and autonomic storms post-injury.

Findings:

  • The subject developed dysautonomia, characterized by a central hyperadrenergic state with superimposed autonomic storms.
  • Additional findings included posttraumatic stress disorder (PTSD) and functional neurologic deficits.

Implications:

  • Lightning strike may directly impact the central nervous system, leading to autonomic dysregulation.
  • Further research is needed to elucidate the mechanisms and long-term effects of lightning-induced autonomic complications.