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Electrodermal activity in patients with neurally mediated syncope.

Michael R Edwards1, Julie Benoit, Ronald Schondorf

  • 1Autonomic Reflex Laboratory Dept.Neurology McGill University, Sir Mortimer B. Davis Jewish General Hospital, 3755 chemin de la Côte St. Catherine, Montreal (QC), H3T 1E2, Canada.

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Electrodermal activity (EDA) often precedes syncope, appearing before changes in blood pressure or cerebral blood velocity. This finding suggests EDA may objectively correlate with presyncope symptoms.

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Area of Science:

  • Cardiology
  • Neuroscience
  • Physiology

Background:

  • Electrodermal activity (EDA) reflects sympathetic nervous system arousal.
  • EDA can manifest in electrocardiogram (ECG) recordings.
  • Syncope is often preceded by subjective symptoms.

Purpose of the Study:

  • To investigate if electrodermal activity changes precede hemodynamic alterations during syncope.
  • To determine the temporal relationship between EDA and blood pressure (BP) or cerebral blood velocity (CBV) before syncope.

Main Methods:

  • Retrospective analysis of 70 patients with recurrent syncope undergoing head-up tilt (HUT) testing.
  • Continuous recording of BP, CBV, expired CO(2) (PCO(2)), and ECG at 400Hz.
  • Independent investigator analysis to determine EDA onset and termination relative to syncope events.

Main Results:

  • In 62% of syncope patients, EDA increased significantly before syncope (257 ± 357s) and persisted post-syncope.
  • EDA onset typically preceded changes in BP, PCO(2), or CBV.
  • In 13% of patients, EDA was not detectable; in 13%, it occurred only post-syncope.

Conclusions:

  • Electrodermal activity changes may serve as an objective marker for presyncope symptoms.
  • EDA's temporal relationship to syncope suggests a role in the autonomic response.
  • Further research is needed to clarify the precise link between EDA and presyncope experiences.