Ryan et al used echocardiography to measure dimensions of the left ventricle during end-systole and end-diastole. These can be used to generate the eccentricity index (EI), which can separate right ventricular volume overload from right ventricular pressure overload. The authors are from Indiana University.
Echocardiography: views taken at the level of the mitral valve chordae tendineae transition
Measurements:
(1) diameter of the left ventricle perpendicular to the septum during end-diastole
(2) diameter of the left ventricle parallel to the septum during end-diastole
(3) diameter of the left ventricle perpendicular to the septum during end-systole
(4) diameter of the left ventricle parallel to the septum during end-systole
eccentricity index (EI) for end-diastole =
= (diameter parallel to septum) / (diameter perpendicular to septum)
eccentricity index (EI) for end-systole =
= (diameter parallel to septum) / (diameter perpendicular to septum)
EI (end-systole)
EI (end-diastole)
Interpretation
1.0 +/- 0.06
1.01 +/-0.04
normal
1.02 +/- 0.04
1.26 +/- 0.12
right ventricular volume overload
1.44 +/- 0.16
1.26 +/- 0.11
right ventricular pressure overload
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