Figure 1.
Examples of strain wave of curves of different colors representing the strain of different segments of atrial walls.
Imagine A (from 4-chamber view) and B (from 2-chamber view) show the strain wave from a paroxysmal AF subjects.
Figure 2.
Left atrial volume index and ejection fraction of AF with different stroke risk score.
Low(CHADS2/CHA2DS2-VASc score of 0), moderate (CHADS2 /CHA2DS2-VASc score of 1), and high (CHADS2/CHA2DS2-VASc score of ≥2) risk; Maximum LA volume index; LAEFt , LA total emptying fraction; LAEFp.
Figure 3.
Distribution of LA mean strain of AF with different stroke risk score.
Low (CHADS2/CHA2DS2-VASc score of 0), moderate (CHADS2 /CHA2DS2-VASc score of 1), and high (CHADS2/CHA2DS2-VASc score of ≥2) risk; The central box represents the values from the lower to upper quartile (25th to 75th percentile). The middle line represents the median. The whiskers extend from the minimum to the maximum value.
Figure 4.
Diagnostic value ROC curve of various cic parameters.
The receiver-operator characteristic (ROC) curve testing diagnostic value of left ventricular ejection fraction (LVEF), the ratio of mitral inflow E velocity to myocardial e`sep velocity in the mitral annulus(E/e`sep), Maximum LA volume index(LAVImax), LA total emptying fraction(LAEFt), LA mean strain in predicting CHA2DS2-VASc score=0 in AF. Two models have different patient numbers that might lead to a small difference in area under the receiver-operator characteristic curve (AUC).Model A: AUC: 0.82, 95%CI: 0.73 to 0.91; Model B: AUC: 0.79, 95%CI: 0.69 to 0.88, p =0.59.
Figure 5.
Intraobserver and Interobserver Reproducibility for VVI derived LA Mean strain and LA Mean strain Rate.
The mean bias intraobserver was 0.6 (limits of agreement, -3.4 to 4.6,) for LA mean strain. The mean bias interobserver was 0.1 (limits of agreement, -4.2 to 4.4,) for LA mean strain.