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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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The Brain-Heart Network of Syncope.

Sailen Barik1, Thomas Riddell2

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|July 13, 2024
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Summary

Syncope, or fainting, is a common condition with a mysterious cause. This review integrates the Bezold-Jarisch reflex with modern brain-neuron-heart signaling to explain syncope mechanisms.

Keywords:
GPCRadenosine receptorsfaintingneuropeptide Ysyncopevagus nerve

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Area of Science:

  • Neuroscience
  • Cardiology
  • Physiology

Background:

  • Syncope (fainting) is a common, yet poorly understood, transient loss of consciousness.
  • Historically observed, syncope's etiology remains largely a mystery, with limited human patient data.
  • Specialized mammalian neurons and the Bezold-Jarisch reflex offer insights into syncope.

Purpose of the Study:

  • To provide a comprehensive review of current knowledge on syncope.
  • To integrate the Bezold-Jarisch reflex with modern understanding of brain-neuron-heart signaling in syncope.
  • To explore potential molecular signaling pathways and clinical intervention strategies for syncope.

Main Methods:

  • Literature review focusing on syncope and related neurological and cardiovascular mechanisms.
  • Integration of historical reflex models (Bezold-Jarisch reflex) with contemporary signaling loop concepts.
  • Analysis of molecular signaling in the context of a normal heart function.

Main Results:

  • The Bezold-Jarisch reflex shares similarities with syncope and provides a foundational model.
  • A brain-neuron-heart signaling loop model is proposed, incorporating molecular signaling events.
  • Understanding syncope may benefit from studying laboratory mouse models due to scarce human data.

Conclusions:

  • Molecular signaling plays a crucial role in the brain-neuron-heart axis of syncope.
  • Further research into syncope mechanisms could lead to novel clinical interventions.
  • This review aims to stimulate interest in syncope and vertigo, promoting future research and treatment development.