Left ventricular
short axis fractional shortening
FFS= [(end-diastolic - end-systolic) /
end-diastolic] x 100 (%)
- Shortening Fraction （FS）. The shortening
fraction is a slightly different way of measuring left ventricle
performance. Instead of measuring and ratio-ing blood volumes, the
shortening fraction measures and ratios the change in the diameter of
the left ventricle between the contracted and relaxed states: 与EF测定心脏的博出容量不同，FS主要是测量收缩和舒张状态下的左室壁直径变化率。
- The normal range is 0.18-0.42, or 18-42% (reference: Measurements in Cardiology).
According to the Oeffinger/Keene article, " . . . above 30% is
considered normal, with 26 to 30% representing a mild decrease in
function. . . . A decrease in the shortening fraction usually precedes
a detectable decrease in the ejection fraction." FS的正常范围在0.18~0.42（或者18%~42%）。Oeffinger和Keene的文章中提到“......FS30%以上是正常的，26%到30%代表心功能轻微的降低......如果FS下降的话，一般都可以同时检测到EF的下降。”
M-Mode
examination of the left ventricle
Normal
values
Left panel: normal LV
Right panel: dilated LV with reduced systolic function. Fractional
shortening is 21 %. Note hypokinesis of the interventricular
septum.
Note increased mitral
E-septum separation on the right, as compared to the normal
LV.
IVS: interventricular septum
LV: left ventricular cavity
Phono: phonocardiographic tracing
PLW: postero-lateral wall
RV: right ventricular cavity
Measurement units: cm
Normal values:
PWT= 43 - 61 %
IVS= 34 - 50 %
Measurement of end-diastolic (red arrows
synchronous with Q wave of ECG) and end-systolic (at maximum systolic wall
thickness) left ventricular wall thickness.
Left ventricular
wall thickening
PWT= [(end-systolic
- end-diastolic) /
end-diastolic] x 100 (%)
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