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Related Experiment Videos

Neurally mediated syncope: pathophysiology and implications for treatment.

R M Robertson1, E Medina, N Shah

  • 1Autonomic Dysfunction Center, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA. rosemarie.robertson@mcmail.vanderbilt.edu

The American Journal of the Medical Sciences
|February 26, 1999
PubMed
Summary
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Neurally mediated syncope, often vasovagal syncope, may involve mechanisms beyond vagal activation. Some patients show reduced sympathetic responses and abnormal baroreflexes, suggesting new therapeutic targets for this disabling condition.

Area of Science:

  • Cardiology
  • Neurology
  • Physiology

Background:

  • Neurally mediated syncope (NMS) can affect patients not fitting orthostatic intolerance profiles.
  • Neurocardiogenic or vasovagal syncope can be severely debilitating.

Purpose of the Study:

  • To investigate alternative mechanisms in neurally mediated syncope beyond traditional vagal activation.
  • To explore the role of sympathetic responses and baroreflex function in NMS.

Main Methods:

  • Review of critical observations challenging the sole reliance on vagal activation.
  • Analysis of sympathetic nervous system activity and baroreflex responsiveness in patient subsets.

Main Results:

  • Evidence suggests mechanisms other than vagal activation contribute to NMS.

Related Experiment Videos

  • Some patients exhibit reduced sympathetic responses, not increased.
  • Abnormal baroreflex responsiveness may play a causal role in NMS.

    • Conclusions:

    • Findings challenge the established understanding of vasovagal syncope pathophysiology.
    • Identified mechanisms point towards novel therapeutic strategies for NMS.
    • Highlights the need for more randomized, double-blind trials in NMS research.