Key result
Autonomic nervous functional tests assessing baroreceptor reflex, including the head-up tilt test and Valsalva maneuver, are useful for evaluating the pathophysiology of various autonomic disorders.
Autonomic nervous functional tests assessing the baroreceptor reflex provide valuable diagnostic information for evaluating autonomic dysfunction.
May guide autonomic evaluation; leaves open prospective validation of diagnostic protocols.
The autonomic nervous functional tests assessing baroreceptor reflex (BR) were described. I. Head-up tilt test: Sympathetic nervous function is activated and alginine-vasopressin is secreted through the BR. Orthostatic hypotension is induced by BR dysfunction. II. Spectral analysis of heart and blood pressure: High-frequency power in R-R interval variability indicates parasympathetic function and low-frequency power may reflect BR function. Low-frequency power in blood pressure may indicate sympathetic nervous function. However, spectral analysis of them can not detect a sympathetic nervous hyperfunction. III. Baroreceptor sensitivity during the Valsalva maneuver: Baroreceptor sensitivity is obtained from the correlation of systolic blood pressure and RR interval. It decreases in early stage of Parkinson's disease. IV. Correlation of heart rate and blood pressure: The correlation of them may reflect qualitative differences in the central autonomic dysfunction.
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Toshimasa Yamamoto (2014) conducted a review in Autonomic nervous system disorders. Baroreceptor reflex assessment was evaluated. Autonomic nervous functional tests assessing baroreceptor reflex, including the head-up tilt test and Valsalva maneuver, are useful for evaluating the pathophysiology of various autonomic disorders.
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