Related Experiment Videos
Cerebral circulation dysfunction and hemodynamic abnormalities in syncope during upright tilt test
1Noninvasive Neurocybernetic Flow Laboratory, Chidicon Medical Centre, Owerri, Imo State, Nigeria.
The Canadian Journal of Cardiology
|April 1, 1993
Summary
Syncope patients experienced significant drops in cerebral blood flow velocity during tilt tests, even before blood pressure changes. Transcranial Doppler monitoring enhances understanding of syncope
Area of Science:
- Cardiology
- Neurology
- Hemodynamics
Background:
- Syncope, a transient loss of consciousness, has uncertain etiology in many patients.
- Assessing hemodynamic responses during syncope is crucial for diagnosis.
Purpose of the Study:
- To evaluate hemodynamic changes, including cerebral circulation, blood pressure, and heart rate, in syncope patients during an upright tilt test.
- To compare these responses with healthy controls.
Main Methods:
- A nonrandomized study involving 20 syncope patients and 10 healthy controls.
- Utilized transcranial Doppler for middle cerebral artery flow velocity, noninvasive/invasive blood pressure monitoring, ECG, and pulse oximetry during tilt testing.
Main Results:
- Syncope patients showed significant reductions in cerebral blood flow velocity (53-58%) during tilt testing, with some experiencing this before blood pressure drops.
- Healthy controls exhibited no significant change in cerebral blood flow velocity but a heart rate increase of 25%.
Conclusions:
- Transcranial Doppler monitoring during upright tilt testing provides valuable insights into the complex cerebral hemodynamic changes during syncope.
- This technique may aid in understanding the pathophysiology of syncope.