Files in this Data Supplement:

• Data Supplement Figure - (TIF) (29.7 MB). Supine and upright hemodynamics and biochemistry in female patients. Supine and upright values for heart rate in beats per minute (bpm) (Panel A), systolic blood pressure (BP) (Panel B), venous plasma norepinephrine (Panel C), venous plasma epinephrine (Panel D), plasma renin activity (Panel E), and serum aldosterone (Panel F), for patients with POTS (open squares) and control subjects (solid circles). Error bars represent standard error. P values are from a between-group comparison using a Student t test.