Table 2

Comparison of heart rate variability indices between subjects with a positive head up tilt test (HUT) during the passive phase of tilt and those in whom HUT was positive during isoprenaline infusion

  • Values are mean (SD).

  • 2-151 For comparison of supine and upright results between groups.

  • BA, bandwidth area; HF, high frequency (0.15 to 0.4 Hz); LF, low frequency (0.04 to 0.15 Hz); PP, power peak.