Sympathovagal balance analysis in idiopathic postural orthostatictachycardia syndrome

Main Article Content

V. Russo
I. De Crescenzo
E. Ammendola, et al.

Keywords

Postural orthostatic tachycardia sindrome (POTS), sympathovagal balance, heart rate variability (HRV), Head up tilt test

Abstract

The idiopathic postural tachycardia syndrome (POTS) is a complex disorder characterized by chronic orthostatic symptoms and an increase in heart rate within 10 minutes of standing on upright posture, without significant orthostatic hypotension.We describe a case of a 36 year-old patient with POTS, diagnosed by head-up tilt testing. Power spectral analysis of heart rate variability (HRV), performed during the tilt test, revealed the ratio of low and high frequency powers (LF/HF) that increased with the onset of orthostatic intolerance. The increase in LF/HF power ratio may represent sympathetic beta-receptors hyperactivity. Atenolol alleviated his clinical symptoms.
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