Table 1.

Patient characteristics and baseline hemodynamics

Variable	PPFH (n = 8)	NR (n = 8)	p
Age (years)	46 ± 5	47 ± 6	1.0
Gender (m)	7	8	1.0
Blood phobia	4	2	0.6
Syncopes per year	2 ± 0.7	2.8 ± 0.8	0.5
Tilt time (min)	18.5 ± 2	20.3 ± 3	0.6
GTN	4	4	1.0
MAP (mmHg)	84 ± 4	104 ± 5	0.01
HR (bpm)	59 ± 2	73 ± 6	0.07
SV (ml)	102 ± 8	77 ± 8	0.05
CO (l/min)	5.9 ± 0.5	5.5 ± 0.5	0.59
TPR (MU)	0.9 ± 0.1	1.4 ± 0.2	0.05
MSNA (bursts/min)	25 ± 2	23 ± 3	0.8
MSNA (bursts/100b)	43 ± 4	35 ± 7	0.2

Mean ± SE for demographics and baseline variables. All values quoted without units refer to absolute counts

PPFH prolonged post-faint hypotension, NR normal recovery, GTN glyceryl trinitrate given at 20 min head-up tilt, tilt time time tilted up before presyncope, MAP mean arterial pressure, HR heart rate, SV stroke volume, CO cardiac output, TPR total peripheral resistance, MSNA muscle sympathetic nerve activity