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Orthostatic tolerance in patients with unexplained syncope
1Research School of Medicine (Cardiovascular Studies), University of Leeds, UK.
Summary
This study introduces a new combined test to assess orthostatic tolerance in patients with unexplained syncope. The test effectively identifies individuals with poor orthostatic tolerance, aiding in treatment evaluation.
Area of Science:
- Cardiology
- Physiology
Background:
- Orthostatic intolerance (OI) and unexplained syncope are significant clinical challenges.
- Accurate assessment of OI is crucial for effective patient management and treatment efficacy.
Purpose of the Study:
- To evaluate a novel combined head-up tilt and lower body suction test for assessing orthostatic tolerance.
- To determine the test's ability to differentiate patients with syncope from healthy controls.
Main Methods:
- A combined test involving 60-degree head-up tilt followed by lower body suction (-20 and -40 mmHg) was administered to 79 patients with unexplained syncope.
- Noninvasive blood pressure and heart rate monitoring were employed.
- Presyncope and syncope incidence were recorded and compared to asymptomatic controls.
Main Results:
- Ninety-five percent of patients experienced presyncope during the test.
- At -20 mmHg lower body suction, 85% of patients reported presyncope compared to 23% of controls.
- The test demonstrated a clear distinction between patients with syncope and healthy individuals.
Conclusions:
- The combined head-up tilt and lower body suction test is a sensitive tool for identifying poor orthostatic tolerance.
- This test is valuable for discriminating patients with OI and assessing the impact of therapeutic interventions.