Comparison of the pressure gradients obtained by calculation with the pressure gradients obtained by catheterization in patients with aortic valve stenosis

Abstract

This paper presents calculation of the pressure gradient at the point of aortic stenosis in patients with valvular aortic stenosis. The pressure gradients obtained by calculation were compared with the pressure gradients measured using catheterization in 12 patients with valvular aortic stenosis. It has been found that the maximum separation factor influences the maximum blood flow velocity (p<0.05),which was used in calculation of the pressure gradient. There were no statistically significant differences in the pressures obtained by calculation and the pressures obtained by catheterization (p<0.05). These results are in compliance with the widespread use of Doppler echocardiography in practice as a substitute for invasive methods for determining the degree of aortic stenosis. The Doppler echocardiography method is based on calculation presented in this paper.