TABLE 1.

Presyncopal tilt/LBNP test: Hemodynamic variables at supine rest and during the 15-min 80°-head up tilt test (mean ± SD during the last 3 available minutes): Heart Rate (HR, bpm), Systolic and Diastolic Blood Pressure (SBP and DBP, mmHg), Stroke Volume (SV, ml), Total Peripheral Resistance (TPR, dynes⋅s−1⋅cm⁻⁵), Sympathetic Index (ΣI, a.u), i.e., ratio of low-to-high frequency spectral power, Spontaneous Baroreflex Slope (SBRS, ms⋅mmHg⁻¹).

		CON		RVE		NEX		3-way ANOVA (p)
Variable	Position	Pre-HDBR	Post-HDBR	Pre-HDBR	Post-HDBR	Pre-HDBR	Post-HDBR	BR	CM	Position (tilt)	BR *CM	BR*position
HR (bpm)	supine	55 ± 12	67 ± 11	58 ± 17	67 ± 10	57 ± 10	67 ± 11	< 0,0001	0,13	< 0,0001	0,29	0,0002
	tilt	75 ± 10	115 ± 9	78 ± 17	114 ± 4	79 ± 9	123 ± 16
SBP (mmHg)	supine	130 ± 12	134 ± 9	122 ± 7	127 ± 10	124 ± 10	122 ± 9	0,008	0,024	0,25	0,46	0,0003
	tilt	140 ± 12	117 ± 15	128 ± 8	114 ± 11	134 ± 19	109 ± 10
DBP (mmHg)	supine	75 ± 9	76 ± 3	70 ± 8	75 ± 5	74 ± 6	70 ± 5	0,17	0,2	< 0,0001	0,57	0,046
	tilt	89 ± 12	80 ± 8	83 ± 7	78 ± 6	87 ± 13	79 ± 6
SV (ml)	supine	107 ± 14	102 ± 11	110 ± 15	100 ± 15	103 ± 20	104 ± 14	0,002	0,47	< 0,0001	0,94	0,098
	tilt	78 ± 15	63 ± 14	77 ± 16	66 ± 10	73 ± 16	56 ± 13
TPR (Dynes.s–1cm–5)	supine	1390 ± 409	1164 ± 178	1212 ± 313	1178 ± 320	1333 ± 255	1081 ± 318	0,003	0,23	0,16	0,76	0,006
	tilt	1568 ± 513	1110 ± 168	1405 ± 284	1006 ± 105	1539 ± 433	1213 ± 302
ΣI (A.U.)	supine	1,83 ± 1,34	4,04 ± 4,63	1,92 ± 1,51	3,35 ± 1,8	2,27 ± 2,86	2,53 ± 3,07	0,11	0,61	0,02	0,47	0,006
	tilt	5,74 ± 4,6	2,76 ± 1,81	6,82 ± 5,25	3,32 ± 2,55	6,14 ± 3,65	2,05 ± 1,04
SBRS (ms.mmHg–1)	supine	19,6 ± 12,9	12,8 ± 5	22 ± 13,6	11,9 ± 4,7	17,3 ± 1,3	15,1 ± 6,2	0,001	0,7	< 0,0001	0,54	0,39
	tilt	8,0 ± 3,1	3,3 ± 1,8	9,0 ± 4,6	3,0 ± 1	6,6 ± 3,3	3,1 ± 1,3

Significant differences are bolded.