Table 2.

Autonomic Function Testing

Parameter, unit	Patients (n=10)	Normal*
Orthostatic Change in SBP, mmHg	−73 ± 11	4 ± 3
Orthostatic Change in HR, bpm	12 ± 2	10 ± 2
Sinus Arrhythmia Ratio	1.05 ± 0.02	1.33 ± 0.11
Valsalva Ratio	1.13 ± 0.04	1.51 ± 0.09
Valsalva Phase II ΔSBP, mmHg	−80 ± 10	−37 ± 6
Valsalva Phase IV ΔSBP, mmHg †	−45 ± 6	13 ± 7
Hyperventilation ΔSBP, mmHg	−36 ± 9	−4 ± 3
Handgrip ΔSBP, mmHg	6 ± 3	22 ± 7
Cold Pressor ΔSBP, mmHg	8 ± 3	16 ± 3

Data are presented as mean ± SEM. SBP, systolic blood pressure; HR, heart rate; ΔSBP, change in systolic blood pressure compared with baseline.

^*Normal values are for reference only, and were obtained from healthy age-matched volunteers obtained from the Vanderbilt Autonomic Dysfunction Center database.

^†A negative value indicates that the blood pressure overshoot was absent.