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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
Published on: March 21, 2013
Prolonged post-faint hypotension can be reversed by dynamic tension
W Wieling1, J Rozenberg, I K Schon
1Department of Medicine, Academic Medical Centre, University of Amsterdam,The Netherlands. w.wieling@amc.nl
Summary
Prolonged post-faint hypotension (PPFH), a severe form of vasovagal syncope, can cause prolonged low blood pressure after fainting. Active leg movements may be needed to restore blood pressure during PPFH events.
Area of Science:
- Cardiology
- Neurology
- Physiology
Background:
- Vasovagal syncope is a common condition characterized by a sudden drop in heart rate and blood pressure, leading to fainting.
- A severe variant, prolonged post-faint hypotension (PPFH), has been identified, posing unique clinical challenges.
Observation:
- A case study involved a 49-year-old male with a history of severe fainting attacks undergoing a head-up tilt test.
- Syncope occurred after nitroglycerine administration, followed by a prolonged period of unconsciousness and asystole.
- Post-syncope, the patient experienced persistent hypotension and bradycardia, unresponsive to passive leg raising.
Findings:
- The patient's blood pressure and heart rate only normalized after performing active bilateral leg flexion and extension, termed "dynamic tension."
- This suggests that in PPFH, extreme vagal activity may necessitate central stimulation alongside measures to improve venous return.
Implications:
- PPFH represents a distinct and severe manifestation of vasovagal syncope requiring specific management strategies.
- Understanding the physiological mechanisms of PPFH, including the role of central stimulation and venous return, is crucial for effective treatment.
- This case highlights the potential benefit of active physical maneuvers in counteracting prolonged hypotension during vasovagal episodes.
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