Related Experiment Videos
Increase in plasma beta endorphins precedes vasodepressor syncope
D R Wallbridge1, H E MacIntyre, C E Gray
1Department of Medical Cardiology, Royal Infirmary, Glasgow.
British Heart Journal
|June 1, 1994
Summary
Plasma beta endorphins increase before vasodepressor syncope, supporting their role in this condition. This study measured beta endorphin levels during tilt testing in patients with unexplained syncope.
Area of Science:
- Neuroendocrinology
- Cardiovascular Physiology
Context:
- Endogenous opioids modulate sympathetic tone.
- Vasodepressor syncope pathophysiology involves opioid pathways.
- Previous studies noted increased beta-endorphin post-syncope.
Purpose:
- To assess plasma beta-endorphin levels during tilt testing.
- To determine if beta-endorphin rises precede syncope onset.
Summary:
- 24 patients with unexplained syncope underwent tilt testing.
- Plasma beta-endorphin was measured via radioimmunoassay.
- Positive tilt tests showed a significant beta-endorphin rise before syncope.
Impact:
- Demonstrates a rise in plasma beta-endorphins preceding vasodepressor syncope.
- Provides evidence for the pathophysiological role of endogenous opioids in syncope.
- Highlights beta-endorphins as potential biomarkers for syncope prediction.