Left ventricle size

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With the measurement of the left ventricle diameter in diastole and in systole, you will be able to determine if the left ventricle is:

-normal size

-dilated: mildly, moderately or severely

-small


The left ventricle diameter is measured in parasternal long axis, at the tip of the mitral leaflets, at the interface blood-internall wall.


The diastolic diameter: LVED, is the most important. It is measured at end diastole, on the frame after mitral closure. It normally corresponds to the largest cardiac dimension.

LVED (mm) Normal Mildly dilated Moderately dilated Severely dilated
Men 42-59 60-63 64-68 >69
Women 39-53 54-57 58-61 >62


The systolic diameter: LVES, is measured at end systole, on the frame preceding mitral valve opening. It corresponds to the smallest cardiac dimension.


With the left ventricle end-diastolic and end-systolic diameters, you will be able to calculate the shortening fraction. The shortening fraction reflects the left ventricle systolic function, but is valid only if the left ventricle geometry is normal and in the absence of wall motion abnormality.


                                 (LVED-LVES)

Shortening fraction =   --------------------   * 100

                                      LVED


Shortening fraction  %
Normal 25-45
Mild 20-25
Moderate 15-20
Severe <15
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