Discrepancies between cardiovascular magnetic resonance and Doppler echocardiography in the measurement of transvalvular gradient in aortic stenosis: the effect of flow vorticity

Table 2 Univariate and multivariate determinants of relative error in transvalvular mean pressure gradient

Mean transvalvular pressure gradient	Univariate analysis		Multivariate model
Relative error = MRI-TTE/TTE (%)	βeta coeff ± SE	p-value	βeta coeff ± SE	p-value
Age (years)	0.19 ± 0.19	0.123	-	0.609
Effective orifice area (cm²)*	−0.14 ± 4.66	0.256	-	0.112
Strouhal number*	−0.19 ± 809	0.123	−0.46 ± 934	0.002
Energy loss (mmHg)*	−0.33 ± 0.37	0.006	−0.41 ± 0.36	0.001
Mean systolic vorticity (1/s)*	−0.36 ± 0.09	0.003	−0.53 ± 0.08	<0.001

Legend: *Parameters computed from CMR. Multivariate model includes only variables that were significantly (p<0.15) associated with transvalvular mean pressure gradient relative error on univariate analysis. Βeta coeff ± SE were standardized regression coefficients ± standard error.

ISSN: 1532-429X