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Related Experiment Videos

Failure to decrease parasympathetic tone during upright tilt predicts a positive tilt-table test

N Lippman1, K M Stein, B B Lerman

  • 1Department of Medicine, New York Hospital-Cornell Medical Center, New York 10021.

The American Journal of Cardiology
|March 15, 1995
PubMed
Summary
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Patients with vasodepressor syncope show distinct autonomic nervous system responses during tilt-table testing. A failure to decrease parasympathetic tone, measured by RMSSD, predicts a positive tilt response.

Area of Science:

  • Cardiology
  • Autonomic Neuroscience
  • Physiology

Background:

  • Vasodepressor syncope is often linked to cardiac mechanoreceptor activation via sympathetic tone.
  • The autonomic nervous system plays a crucial role in syncope responses.
  • Orthostatic stress testing is used to evaluate syncope.

Purpose of the Study:

  • To investigate if sympathetic and parasympathetic nervous system responses to orthostatic stress differentiate tilt-table test outcomes.
  • To assess heart rate variability (HRV) as a marker of autonomic function in syncope patients.

Main Methods:

  • Evaluated 28 patients undergoing tilt-table testing for suspected vasodepressor syncope.
  • Analyzed 5-minute ECG samples in supine and upright positions.
  • Calculated mean RR interval (integrated autonomic tone) and RMSSD (parasympathetic tone).

Related Experiment Videos

Main Results:

  • No baseline differences were observed between groups.
  • Mean RR interval decreased similarly in both positive and negative tilt response groups.
  • RMSSD significantly decreased in negative responders but not in positive responders upon tilting.
  • Absence of RMSSD decrease showed 100% specificity for predicting a positive tilt response.

Conclusions:

  • Failure to withdraw parasympathetic tone during orthostatic stress predicts a positive tilt-table test response.
  • RMSSD is a valuable indicator of parasympathetic activity during tilt-table testing.
  • Autonomic nervous system assessment via HRV can aid in diagnosing vasodepressor syncope.