Why the study?
Does the immediate heart rate variability response to orthostatism differ between patients with positive versus negative head up tilt tests for unexplained syncope?
Population
69 subjects, mean (SD) age 42 (18) years, undergoing 60 degrees head up tilt to evaluate unexplained syncope.
Comparison
60 degrees head up tilt test vs Subjects with a negative head up tilt test
Design
Cross-sectional
Follow-up
Immediate (during tilt test)
Authors
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A decrease in the LF/HF power ratio immediately after assuming an upright posture during a head up tilt test is highly predictive of a subsequent positive test for vasovagal syncope.
Does the immediate heart rate variability response to orthostatism differ between patients with positive versus negative head up tilt tests for unexplained syncope?
A decrease in the LF/HF power ratio immediately after assuming an upright posture during a head up tilt test is highly predictive of a subsequent positive test for vasovagal syncope.
Kouakam et al. (1999) studied this question.
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