Table 1.

Effect of tidal volume, increased ITP, and decreased contractility on PP, SV, and ITBV changes

	PP (mmHg)		SV (ml)		PPV (%)	SVV (%)	ITBV change (ml)
	min	max	min	max
Vt (ml/kg) (n = 6)
5	27 ± 12	31 ± 12	21 ± 7	24 ± 9	15 ± 6	14 ± 4	8.6 ± 3.1
10	23 ± 10	29 ± 11	21 ± 6	27 ± 8	25 ± 8	25 ± 10	19.0 ± 10
15	21 ± 9	29 ± 10	20 ± 6	29 ± 10	33 ± 13	34 ± 9	27.2 ± 6.6
25	19 ± 9	29 ± 11	18 ± 6	28 ± 8	42 ± 12	43 ± 7	33.1 ± 7.9
Increased ITP (n = 6)
Baseline	25 ± 9	31 ± 11	20 ± 5	26 ± 6	24 ± 6	24 ± 10	15.9 ± 5.9
Thoraco-abdominal binding	23 ± 7	34 ± 11	19 ± 6	28 ± 8	39 ± 6	40 ± 4	22.2 ± 9.0
Decreased cardiac contractility (n = 4)
Baseline	26 ± 7	37 ± 5	19 ± 6	26 ± 7	37 ± 24	32 ± 16	16.3 ± 6.2
AVF	22 ± 6	28 ± 6	15 ± 6	21 ± 9	26 ± 13	27 ± 11	9.7 ± 5.6

PP, SV, PPV, and SVV values obtained during a three-breath period

V_t tidal volume, PP pulse pressure, SV stroke volume, PPV pulse pressure variation, SVV stroke volume variation, ITBV change intrathoracic blood volume change (average blood volume swing over a three-breath period), ITP intrathoracic pressure, AVF acute ventricular failure