Epicardial circumferential strain was significantly more impaired in patients with transthyretin-related cardiac amyloidosis (-6.0%) compared to those with hypertrophic cardiomyopathy (-8.1%).
Cross-Sectional (n=33)
Does echocardiography with 2-dimensional feature tracking imaging identify differences in epicardial and endocardial strain between patients with transthyretin-related cardiac amyloidosis, hypertrophic cardiomyopathy, and healthy controls?
Two-dimensional feature tracking imaging reveals that epicardial circumferential strain is more severely impaired in transthyretin-related cardiac amyloidosis compared to hypertrophic cardiomyopathy, offering a potential echocardiographic marker to differentiate the two conditions.
Absolute Event Rate: -6% vs -8.1%
p-value: p=<0.0001
BACKGROUND: The aim of the present study was to analyze epicardial (EPI) and endocardial (ENDO) strain (S) in patients with transthyretin-related cardiac amyloidosis (TTR-CA) and hypertrophic cardiomyopathy (HCM) using echocardiography (TTE) with 2-dimensional feature tracking imaging (FTI). METHODS AND RESULTS: Thirty-three subjects (11 with HCM, 11 with TTR-CA, and 11 healthy subjects as controls) with a New York Heart Association functional class ≤ II underwent conventional TTE and FTI. TTE was used for the evaluation of left ventricle (LV) wall thickness, mass, systolic and diastolic function. FTI was used for the evaluation of EPI and ENDO longitudinal, and circumferential, and radial S. LV wall thickness and mass were higher in both TTR-CA and HCM in comparison with controls (P < 0.001), but ejection fraction (EF) was similar among patients with TTR-CA, HCM and controls (63 ± 6%, 64 ± 6%, 61 ± 5%, respectively). ENDO and EPI longitudinal and circumferential S and radial S were significantly lower in HCM and TTR-CA when compared with controls (P < 0.01). No differences in EPI and ENDO longitudinal S, ENDO circumferential S and radial S were found between TTR-CA and HCM groups, while EPI circumferential S was significantly lower in the TTRCA group (6 ± 3.3%) than in the HCM group (8.1 ± 4.3%; P < 0.0001). CONCLUSIONS: Longitudinal, circumferential and radial LV deformations are impaired in patients with TTR-CA and HCM with a preserved EF. Impairment of EPI circumferential strain is greater in TTR-CA than in HCM.
Bella et al. (Sat,) conducted a cross-sectional in Transthyretin-related cardiac amyloidosis and hypertrophic cardiomyopathy (n=33). Transthyretin-related cardiac amyloidosis (TTR-CA) vs. Hypertrophic cardiomyopathy (HCM) was evaluated on Mean epicardial (EPI) circumferential strain (p=<0.0001). Epicardial circumferential strain was significantly more impaired in patients with transthyretin-related cardiac amyloidosis (-6.0%) compared to those with hypertrophic cardiomyopathy (-8.1%).