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Related Experiment Videos

Respiratory changes in vasovagal syncope.

A S Kurbaan1, M Erickson, M E Petersen

  • 1Department of Cardiology, London Chest Hospital, United Kingdom. a_kurbaan@hotmail.com

Journal of Cardiovascular Electrophysiology
|June 27, 2000
PubMed
Summary
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Head-up tilt tests reveal significant cardiorespiratory changes in vasovagal syncope patients. Increased tidal volume and minute ventilation during syncope suggest respiratory sensors may aid early diagnosis.

Area of Science:

  • Cardiology
  • Respiratory Physiology
  • Nephrology

Background:

  • Head-up tilt testing is used to diagnose vasovagal syncope.
  • Cardiovascular changes are known to occur during this test.
  • Respiratory changes accompanying these cardiovascular changes are less understood.

Purpose of the Study:

  • To investigate cardiorespiratory changes during head-up tilt test-induced vasovagal syncope.
  • To compare these changes between patients who experience syncope and those who do not.

Main Methods:

  • The Westminster protocol (45-minute, 60-degree head-up tilt) was used.
  • 29 patients were studied, divided into syncope-positive (14) and syncope-negative (15) groups.
  • Blood pressure (BP), heart rate (HR), tidal volume, and minute volume were measured.

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Main Results:

  • Significant differences in BP, HR, tidal volume, and minute volume were observed between the positive and negative groups during late tilt.
  • In the positive group, BP and HR decreased, while tidal volume and minute volume significantly increased from early to late tilt.
  • No comparable cardiorespiratory changes were noted in the negative group.

Conclusions:

  • Significant differences in cardiorespiratory parameters exist between patients with and without tilt-induced vasovagal syncope.
  • Increased respiratory volumes during syncope suggest a potential role for respiratory sensors in diagnosis.
  • Respiratory monitoring may offer opportunities for earlier and more effective therapeutic interventions.