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  Indian J Med Microbiol
 

Figure 4: (a) A 38-year-old patient with QRS = 149 ms (intraventricular conduction defect) and left ventricular ejection fraction = 38%. In spite of wide QRS, equilibrium radionuclide angiography shows the absence of dyssynchrony. Value of standard deviation of left ventricular mean phase angle is 8°. (b) Speckle-tracking echocardiography too, done for the same patient, showing absence of intraleft ventricular dyssynchrony with standard deviation of time-to-peak systolic circumferential strain value of 63 ms. R–R: R–R interval on electrocardiogram, HR: Heart rate, SD: Standard deviation

Figure 4: (a) A 38-year-old patient with QRS = 149 ms (intraventricular conduction defect) and left ventricular ejection fraction = 38%. In spite of wide QRS, equilibrium radionuclide angiography shows the absence of dyssynchrony. Value of standard deviation of left ventricular mean phase angle is 8°. (b) Speckle-tracking echocardiography too, done for the same patient, showing absence of intraleft ventricular dyssynchrony with standard deviation of time-to-peak systolic circumferential strain value of 63 ms. R–R: R–R interval on electrocardiogram, HR: Heart rate, SD: Standard deviation