The authors present a case of 36 year old male patient with idiopathic postural orthostatic tachycardia syndrome (POTS) diagnosed during head-up tilt testing. Power spectral analysis of heart rate variability (HRV) during the tilt test revealed that the ratio of low and high frequency powers (LF/HF) increased with the onset of orthostatic intolerance. This analysis confirmed in our patient a strong activation in sympathetic tone. (Heart International 2006; 2: 126-8)
Postural orthostatic tachycardia syndrome, POTS, Sympathovagal balance, Heart rate variability, HRV
Vincenzo Russo, MD, Via della Resistenza, 48, 80021 Afragola (NA) – Italy, firstname.lastname@example.org
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