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Related Experiment Videos

Variable cerebral dysfunction during tilt induced vasovagal syncope

F Ammirati1, F Colivicchi, G Di Battista

  • 1Heart Disease Department, S. Filippo Neri Hospital, Rome, Italy. fabamm@tin.it

Pacing and Clinical Electrophysiology : PACE
|November 24, 1998
PubMed
Summary

Electroencephalographic (EEG) monitoring during head-up tilt testing (HUT) revealed distinct brain wave patterns in patients experiencing syncope. This study details EEG changes associated with vasodepressor and cardioinhibitory syncope, aiding diagnosis.

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Area of Science:

  • Neurology
  • Cardiology
  • Clinical Neurophysiology

Background:

  • Recurrent syncope of unknown origin presents a diagnostic challenge.
  • Extensive clinical and laboratory evaluations are often insufficient for diagnosis.
  • Head-up tilt testing (HUT) is a common diagnostic tool for syncope.

Purpose of the Study:

  • To investigate electroencephalographic (EEG) changes during head-up tilt testing (HUT) in patients with recurrent syncope.
  • To systematically describe EEG abnormalities associated with different types of syncope induced by HUT.
  • To assess the utility of EEG monitoring in diagnosing vasovagal syncope.

Main Methods:

  • 63 patients with recurrent syncope underwent HUT with simultaneous EEG monitoring.
  • Patients were classified based on syncope type (vasodepressor or cardioinhibitory) if syncope occurred.

Related Experiment Videos

  • EEG data was analyzed for changes in brain wave activity during syncope and recovery.

    • Main Results:

    • Syncope occurred in 42.8% of patients during HUT.
    • Vasodepressor syncope showed generalized high-amplitude theta slowing, followed by delta slowing, with rapid EEG normalization upon return to supine.
    • Cardioinhibitory syncope exhibited theta slowing, delta slowing, and then a "flat" EEG, with delayed EEG and consciousness recovery.

    Conclusions:

    • EEG monitoring during HUT provides valuable insights into the pathophysiology of syncope.
    • Distinct EEG patterns differentiate vasodepressor and cardioinhibitory syncope.
    • EEG during HUT aids in the diagnosis and characterization of tilt-induced vasovagal syncope.