Phase image characterization of ventricular contraction in left and right bundle branch block

Sincronia ventricular em portadores de miocardiopatia dilatada e indivíduos normais: avaliação através da ventriculografia radioisotópica

“…Radionuclide ventriculography is a well established technique and it was the first one used in the evaluation of ventricular motility synchrony 13 . It is easy to use, fast, reproducible and it also allows evaluating the overall systolic There was a statistically significant difference in LVEF between groups 2 and 3.…”

“…Values above 40 ms are used by many services in the characterization of interand left intraventricular dyssynchrony through echocardiogram with tissue Doppler 30 . Our study evaluated left ventricular dyssynchrony in a different way than other studies that used RV [12][13][14][15][16]18 . We measured the width of LV phase histogram and not the standard deviation (SD).…”

“…On the other hand, direct measurements of electromechanical dyssynchrony based on simple and non-invasive imaging methods may improve the selection criteria and better predict the response to CRT 9,10 . Some studies have used radionuclide ventriculography (RNV) to assess synchrony of ventricular movements, by means of phase and amplitude parametric images [11][12][13][14][15][16][17][18][19][20] . Thus, quantitative parameters that objectively evaluate the degree of interventricular and left intraventricular synchrony can help in the better selection and follow-up of those patients before and after CRT, adding information to the measurement of QRS interval in the ECG.…”

Utility of Equilibrium Radionuclide Angiogram–Derived Measures of Dyssynchrony to Predict Outcomes in Heart Failure Patients Undergoing Cardiac Resynchronization Therapy

“…Each parameter was calculated from the first harmonic phase histogram in the ventricular ROIs: SDLVØ, SDRVØ, IVS (difference between mean LVS and RVS), LVS, and LVE are defined mathematically elsewhere (11,14,15).…”

“…The sampling rate is sufficient to accurately measure LVEF (23), and temporal resolution is digitally enhanced and objectified by the generation of parametric images. The phase image has successfully tracked the sequence of ventricular wall motion in a variety of conduction abnormalities (15,16,(20)(21)(22)(23). The ability of planar ERNA phase analysis to assess myocardial synchrony is recognized (8,12,(20)(21)(22).…”