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  Indian J Med Microbiol
 

Figure 3: (a) A 25-year-old patient with left bundle branch block (QRS = 189 ms) and left ventricular ejection fraction = 20%. Equilibrium radionuclide angiography based phase image shows significant dyssynchrony (wide variation in timing of contraction among pixels on color scale). Phase histogram is wide, and standard deviation of left ventricular mean phase angle value is 31°. (b) Speckle-tracking echocardiography analysis of the same patient. Standard deviation of time-to-peak strain is 166 ms, that is, higher than the upper limit of normal (see wide scattering of yellow dots) consistent with intraleft ventricular dyssynchrony. R–R: R–R interval on electrocardiogram, HR: Heart rate, SD: Standard deviation

Figure 3: (a) A 25-year-old patient with left bundle branch block (QRS = 189 ms) and left ventricular ejection fraction = 20%. Equilibrium radionuclide angiography based phase image shows significant dyssynchrony (wide variation in timing of contraction among pixels on color scale). Phase histogram is wide, and standard deviation of left ventricular mean phase angle value is 31°. (b) Speckle-tracking echocardiography analysis of the same patient. Standard deviation of time-to-peak strain is 166 ms, that is, higher than the upper limit of normal (see wide scattering of yellow dots) consistent with intraleft ventricular dyssynchrony. R–R: R–R interval on electrocardiogram, HR: Heart rate, SD: Standard deviation