Use Of Heart Blood Flow Analysis In
Clinical Practice
Author(s)
A. K. Macpherson, S. Neti, M. Averbach, P. A. Macpherson
& C. Chutakositkanon
Abstract
Often in the treatment of patients echocardiograms are performed to analyse
cardiac function. As part of the calculation the shear and normal stress on the
endocardial surface of the left ventricle can be calculated. This was undertaken
for five elderly women patients undergoing stress testing. It was found that when
the stress was plotted as a function of strain rate the expected variation would be
a linear increase in stress. In some patients there was initially a sharp increase in
stress with strain rate then an abrupt change in the stress at the apex or at the
mitral valve annulus. With further increase in strain rate the rate of increase in
stress decreased. This would suggest that there was some defect in the wall
structure. The variation of ventricular volume with strain rate can be obtained.
In this case the volume should decrease initially and as the strain rate increases
the volume change becomes less. In two of the five patients the expected initial
rise in stress did not occur. This suggests a lack of strength of the ventricle. As
expected these were not the same patients where the abrupt increase in stress
occurred. Such information may be helpful to a clinician in reaching a diagnosis.
Keywords: cardiography, blood flow, echocardiograms, patient diagnosis, stress
test, dobutamine.
Keywords
cardiography, blood flow, echocardiograms, patient diagnosis, stress
test, dobutamine.
Related Book
Other papers in this volume
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