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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
Published on: March 21, 2013
Individual stability of orthostatic tolerance response
Nandu Goswami1, H K Lackner, E K Grasser
1Medical University Graz Institute of Physiology, Center of Physiological Medicine Graz Austria. nandu.goswami@meduni-graz.at
Acta Physiologica Hungarica
|May 22, 2009
Summary
Orthostatic tolerance is stable within individuals, despite variations between healthy men. Monitoring both presyncopal signs and symptoms is crucial for accurate assessment during head-up tilt and lower body negative pressure tests.
Area of Science:
- Cardiovascular Physiology
- Human Physiology
Background:
- Orthostatic intolerance is a common clinical issue.
- Understanding individual responses to orthostatic stress is vital.
Purpose of the Study:
- To assess the individual stability of orthostatic tolerance.
- To evaluate presyncopal signs and symptoms during repeated testing.
Main Methods:
- Ten healthy males underwent combined head-up tilt and lower body negative pressure (HUT+LBNP).
- Four test runs were conducted with two-week intervals.
- Hemodynamic variables and orthostatic tolerance were measured until presyncope.
Main Results:
- Mean arterial blood pressure and stroke index decreased significantly towards presyncope.
- Individual orthostatic tolerance varied widely (7.2–30.0 min).
- Orthostatic tolerance showed good within-subject stability across repeated trials, though not statistically significant.
- Presyncopal signs and symptoms were not always consistent within individuals across trials.
Conclusions:
- Orthostatic tolerance is reproducible within individuals, despite significant inter-individual variability.
- Presyncopal signs and symptoms can be inconsistent, necessitating monitoring of both.
- Accurate assessment requires careful attention to both objective signs and subjective symptoms during orthostatic stress testing.
