5 Conclusion
AT/ET is a reliable and useful index for AS severity. However, AT/ET
values obtained by the right parasternal approach is slightly greater
than those obtained by apical approach, which should be called an
attention to prevent incorrect diagnosis of AS severity. The right
parasternal approach is useful to detect the highest peak transaortic
velocity, however, AT/ET values obtained from the right parasternal
approach were not always as same as those obtained from the apical
approach.
Acknowledgement: We thank Ms Nakaya S, Mr Uechi T, and Ms
Katamoto Y for their help in analysis of data variability.