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Figure 2: Stratification of linear correlation between standard TTE and HHU for LVEF (a and b) and WMSI (c and d) based on (a and c) FIT = 1 and (b and d) FIT ≥2, showing a concordance correlation coefficient of 0.64 versus 0.80 for a and b, and 0.70 versus 0.87 for c and d, respectively. FIT = Fellow in training, TTE = Transthoracic echocardiography, HHU = Handheld ultrasonography, LVEF = Left ventricular ejection fraction, WMSI = Wall motion score index 
