Table 3

Multivariate analysis of haemodynamic variables that independently determine transvalvar pressure gradients

Variable	Transvalvar pressure gradient
Variable	Peak to peak	Peak	Mean
p Value and ΔR² value for each independent variable in the multivariate predictive model are given. ΔR² represents the respective contribution of the variable to the variance of TPG.
*Pressure gradient predicted by equation 8 from the energy loss coefficient and the mean systolic flow rate measured by Doppler echocardiography.
NA, not applicable; NS, not significant.
Predicted gradient*
p Value	<0.001	<0.001	<0.001
ΔR²	0.67	0.89	0.89
Systolic arterial pressure	NS	NS	NS
Diastolic arterial pressure	NS	NS	NS
Pulse pressure	NS	NS	NS
Systemic arterial resistance	NS	NS	NS
Systemic arterial compliance
p Value	<0.001	NS	NS
ΔR²	0.20	NA	NA
Multivariate model
p Value	<0.001	<0.001	<0.001
ΔR²	0.87	0.89	0.89