Table 1.

Mean and range of individual r² values and individual regression line slope values of hemodynamic variables vs. central venous pressure

	r2	r2 Range	Slope	Slope Range
Heart rate
LBNP	0.67	0.14–0.95	−2.42	−4.58 to −0.46
BL	0.54	0.02–0.98	−1.53	−5.29–0.12
MAP
LBNP	0.68	0.23–0.99	0.93	0.08–3.48
BL	0.35*	<0.01–0.66	0.13*	−1.30–2.12
Pulse pressure
LBNP	0.72	0.01–0.97	1.81	0.03–4.37
BL	0.49	<0.01–0.92	1.23	0.09–3.63
SaO2
LBNP	0.52	0.03–0.95	−0.04	−0.28–0.23
BL	0.46	0.01–0.98	−0.04	−0.68–0.32
Stroke volume
LBNP	0.85	0.44–0.99	3.69	1.86–5.26
BL	0.73	<0.01–0.93	3.59	0.25–5.74
Cardiac output
LBNP	0.68	0.18–0.99	0.10	−0.02–0.24
BL	0.61	<0.01–0.98	0.10	−0.13–0.31
TPR
LBNP	0.51	0.24–0.99	−0.26	−0.63–0.17
BL	0.53	0.02–0.99	0.07	−0.75–0.99

BL, blood loss; LBNP, lower body negative pressure; MAP, mean arterial pressure; Sa_O2, arterial oxygen saturation; TPR, total peripheral resistance.

^*Different from LBNP, P < 0.05.