Figure 1 Heart rate (HR), blood pressure (BP), plasma norepinephrine (NE), and plasma vasopressin concentration while in the supine position and during head-up and head-down tilt in patients with familial dysautonomia (FD), patients with pure autonomic failure (PAF), and normal controls

AVP = arginine vasopressin; ND = not done. Figurine denotes position on the tilt table (supine, head-up and head-down tilt). ***p < 0.001, **p < 0.02, *p < 0.05.