Aim: This study assessed RV dyssynchrony (irrespective to QRS duration) and RV systolic function in non-ischemic dilated cardiomyopathy (NIDCM) versus ischemic dilated cardiomyopathy (IDCM) patients by using different echo-Doppler modalities.
Methods: Eighty-five cases (48 patients with DCM [whether ischemic or non-ischemic] and 37 age-matched healthy controls) were studied. Conventional echo-Doppler study, tissue Doppler (TDI), and speckle tracking (STE) were carried out to measure LV and RV systolic function. Time-to-peak negative longitudinal strain at the four RV sites were assessed by TDI derived strain and 2D speckle tracking.
Results: Patients with DCM (whether ischemic or non-ischemic) had significantly lower fractional area change, RV tricuspid annular systolic velocity (p < .001 for both), tricuspid annular plane systolic excursion (p = .01), RV-GLS whether TDI or 2D derived (p < .001). Twenty-nine patients (60%) showed right intraventricular delay (RV4SD > 60 ms). The RV-dyssynchrony index was negatively correlated to %FAC (r = -.362, p = .01), RV Sm (r = -.312, p = .04), and 2D-RV GLS (r = -.305, p = .05). Insignificant higher RV-dysynchrony index was detected in NIDCM compared to IDCM group; however, the basal septal segment was significantly delayed in dilated group. More impaired RV systolic function was detected in ischemic group. 2D STE and TDI showed a significant correlation in the assessment of the right-intraventricular delay (p = .001).
Conclusion: Right-intraventricular dyssynchrony are detectable in patients with dilated cardiomyopathy (whether ischemic or non-ischemic) with a higher statistically insignificant value in non-ischemic group by using tissue Doppler imaging and 2D speckle tracking. More impairment of the RV systolic function was noticed in the ischemic group. Impaired RV systolic function was associated with right intraventricular delay.
Keywords: dilated cardiomyopathy; right ventricular dyssynchrony index; speckle tracking echocardiography.
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