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. 2022 Oct;30(4):307-319.
doi: 10.4250/jcvi.2022.0061.

Evaluation of Cardiac Mechanical Dyssynchrony in Heart Failure Patients Using Current Echo-Doppler Modalities

Rehab M Hamdy  1 , Hend Osama  2 , Hanaa M Fereig  2
Affiliations

Evaluation of Cardiac Mechanical Dyssynchrony in Heart Failure Patients Using Current Echo-Doppler Modalities

Rehab M Hamdy et al. J Cardiovasc Imaging. 2022 Oct.

Abstract

Background: Current guidelines indicate electrical dyssynchrony as the major criteria for selecting patients for cardiac resynchronization therapy, and 25-35% of patients exhibit unfavorable responses to cardiac resynchronization therapy (CRT). We aimed to evaluate different cardiac mechanical dyssynchrony parameters in heart failure patients using current echo-Doppler modalities and we analyzed their association with electrical dyssynchrony.

Methods: The study included 120 heart failure with reduced ejection fraction (HFrEF) who underwent assessments for left ventricular mechanical dyssynchrony (LVMD) and interventricular mechanical dyssynchrony (IVMD).

Results: Patients were classified according to QRS duration: group I with QRS < 120 ms, group II with QRS 120-149 ms, and group III with QRS ≥ 150 ms. Group III had significantly higher IVMD, LVMD indices, TS-SD speckle-tracking echocardiography (STE) 12 segments (standard deviation of time to peak longitudinal strain speckle tracking echocardiography in 12 LV-segments), and LVMD score compared with group I and group II. Group II and group III were classified according to QRS morphology into left bundle branch block (LBBB) and non-LBBB subgroups. LVMD score, TS-SD 12 TDI, and TS-SD 12 STE had good correlations with QRS duration.

Conclusions: HFrEF patients with wide QRS duration (> 150 ms) had more evident LVMD compared with patients with narrow or intermediate QRS. Those patients with intermediate QRS duration (120-150 ms) had substantial LVMD assessed by both TDI and 2D STE, regardless of QRS morphology. Subsequently, we suggest that LVMD indices might be employed as additive criteria to predict CRT response in that patient subgroup. Electrical and mechanical dyssynchrony were strongly correlated in HFrEF patients.

Keywords: Heart failure; Interventricuar mechanical delay; Left ventricular mechanical dyssynchrony score; Speckle tracking echocardiography.

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Conflict of interest statement

The authors have no financial conflicts of interest.

Figures

Figure 1
Figure 1. Sensitivity and specificity of suggested LVMD scores for of LVMD detection in heart failure patients (area under the curve = 0.964).
LVMD: left ventricular mechanical dyssynchrony, ROC: receiver operating characteristic.
Figure 2
Figure 2. Prevalence of IVMD and LVMD among the studied groups.
IVMD: interventricular mechanical dyssynchrony, LVMD: left ventricular mechanical dyssynchrony.
Figure 3
Figure 3. Correlation between QRS duration with (A) TS-SDTDI 12 segments, (B) TS-SDSTE 12 segments, and (C) LVMD score among studied patients.
IVMD: interventricular mechanical dyssynchrony, LVMD: left ventricular mechanical dyssynchrony.
See this image and copyright information in PMC

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