Table 3.

 Multivariate analysis of haemodynamic variables that independently determine transvalvar pressure gradients

Variable	Transvalvar pressure gradient
	Peak to peak	Peak	Mean
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

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.