How do you interpret a global longitudinal strain?
Because GLS normally varies with age, sex, and LV loading conditions, defining abnormal GLS is not straightforward. However, in adults, GLS <16% (sic) is abnormal, GLS >18% (sic) is normal, and GLS 16% to 18% is borderline. (Editor’s note: GLS is expressed as a negative number.)
What is normal strain on Echo?
Diastolic myocardial deformation can be assessed more clearly in this way. Normal values of longitudinal LV deformation are 1 – 1.5/s or higher. Normal strain: values of myo- cardial deformation at systole lie here around -25 % on the lateral segments of the left ventricle.
What is myocardial strain analysis?
Myocardial strain analysis, which is more useful than LVEF for detecting subtle changes in cardiac function caused by pathological processes, has recently been developed, mainly as a diagnostic technique in echocardiography.
What is left ventricular global longitudinal strain?
Left ventricular global longitudinal strain (GLS) measures the maximal shortening of myocardial longitudinal length during systole compared to the resting length in diastole. Reduced GLS may reflect abnormal systolic function before loss of ejection fraction (EF) becomes apparent.
What is normal value of global longitudinal strain?
The normal range for global longitudinal strain was 21%, although it significantly varied with age. Patients aged older than 60 years had lower global longitudinal strain compared with those younger than 60 years (20% vs.
What does an abnormal GLS mean?
Conclusions. In patients with a recovered LVEF, an abnormal GLS predicts the likelihood of having a decrease LVEF during follow-up, whereas a normal GLS predicts the likelihood of stable LVEF during recovery.
How do you measure a myocardial strain?
Strain ɛ(t) in the myocardium can be measured by tissue Doppler imaging (TDI) or by speckle-tracking echocardiography (STE).
How do you evaluate cardiac function?
Cardiac function can be measured directly by cardiac catheterization. A catheter is passed into the right and left sides of the heart via a large peripheral vessel. Hemodynamic parameters and vascular resistance can be accurately measured.
What does left ventricular strain mean?
The generally accepted definition of left ventricular strain is an ST-segment depression that is bowed upwards and slopes down into an inverted asymmetrical T wave.
How do you calculate longitudinal strain?
The longitudinal strain is the change in length divided by the original length.