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Related Experiment Videos

Head-up tilt for triggering and diagnosing syncope.

D Grossi1, C Nozzoli, M E Roca

  • 1First Department of Neurology, University of Bari, Italy.

Functional Neurology
|October 1, 1987
PubMed
Summary
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Head-up tilt testing effectively identifies causes of fainting (syncope) in many patients. This test revealed vasodepressor or cardioinhibitory reactions in over 26% of patients with loss of consciousness.

Area of Science:

  • Cardiology
  • Neurology
  • Autonomic Nervous System Function

Background:

  • Syncope, or fainting, is a common clinical problem often requiring diagnostic investigation.
  • Understanding the underlying mechanisms of syncope is crucial for effective patient management.

Purpose of the Study:

  • To evaluate the utility of head-up tilt testing in diagnosing the cause of syncope.
  • To characterize the cardiovascular and electroencephalographic (EEG) responses during tilt-induced syncope.

Main Methods:

  • Head-up tilt to 70 degrees for 30 minutes was performed on 109 outpatients with a history of loss of consciousness.
  • Cardiovascular parameters (blood pressure, ECG) and EEG changes were monitored during the test.
  • Vasodepressor and/or cardioinhibitory reactions were recorded.

Related Experiment Videos

Main Results:

  • Head-up tilt testing induced vasodepressor and/or cardioinhibitory reactions in 26.69% of the studied patients.
  • All symptomatic patients exhibited similar EEG changes and a significant drop in blood pressure.
  • Electrocardiogram (ECG) findings, reflecting vagal activation, varied among individuals.

Conclusions:

  • Head-up tilt testing is a valuable diagnostic tool for syncope, particularly for identifying vasodepressor and cardioinhibitory responses.
  • The pathogenesis of vasovagal syncope involves sympathetic inhibition and vagal activation, potentially triggered by cardiac reflexes or central mechanisms.
  • Distinct ECG patterns during vagal activation highlight the complexity of syncope mechanisms.