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Related Experiment Videos

Vasodepressor syncope

R Sutton1

  • 1Westminster and Chelsea Hospital, London, UK.

Herz
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

Autonomic nervous system disorders like carotid sinus and vasovagal syndromes can cause syncope. While pacing helps with heart rate issues, it cannot treat blood pressure drops, and drugs offer limited success.

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Area of Science:

  • Cardiology
  • Autonomic Neuroscience

Background:

  • Disorders of autonomic nervous control affecting heart rate and vascular tone are significant causes of syncope.
  • Carotid sinus syndrome and vasovagal syncope are notable examples, but their etiology remains poorly understood.

Purpose of the Study:

  • To review the mechanisms and management of syncope related to autonomic dysfunction.
  • To evaluate the efficacy of current treatments for cardioinhibition and vasodepression components of these syndromes.

Main Methods:

  • Literature review of studies on autonomic syncope, focusing on carotid sinus and vasovagal syndromes.
  • Analysis of treatment strategies, including cardiac pacing and pharmacological interventions.

Main Results:

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  • Autonomic syncope involves both cardioinhibition (slow heart rate) and vasodepression (low blood pressure).
  • Dual-chamber pacing (DDI) with rate hysteresis is effective for cardioinhibition.
  • Pacing does not address vasodepression, and drug therapies have shown limited success in managing this component.

    • Conclusions:

    • Syncope due to autonomic dysfunction presents complex challenges.
    • Cardiac pacing is beneficial for the heart rate component, but vasodepression remains difficult to manage effectively.
    • Further research is needed for improved therapeutic strategies targeting vasodepression in autonomic syncope.