Value of layer-specific strain distribution patterns in hypertrophied myocardium from different etiologies. (15th April 2019)

• Record Type: Journal Article
• Authors: Huang, Mu-shiang; Lee, Wen-Huang; Tsai, Huey-Ru; Liu, Yen-Wen; Liu, Ping-Yen; Tsai, Wei-Chuan
• Is Part Of: International journal of cardiology. Volume 281(2019)
• Page Start: 69
• Page End: 75
• Publication Date: 2019-04-15
• Subjects: Layer-specific strain -- Hypertrophy cardiomyopathy -- Aortic stenosis; Cardiology -- Periodicals; Electronic journals; 616.12
• DOI: 10.1016/j.ijcard.2019.01.044
• Languages: English
• ISSNs: 0167-5273

Abstract

Abstract: Background: Intrinsic myocardial mechanics might have different patterns because of the different etiologies of myocardial hypertrophy. We used layer-specific strain to compare those with aortic stenosis (AS) and hypertrophic cardiomyopathy (HCM) and examined the differences in strain distribution pattern and for their clinical implications. Methods: Comprehensive echocardiography was done in 3 groups: 129 with moderate-to-severe AS, 172 consecutive patients with HCM, and 58 healthy controls. Left ventricle (LV) layer-specific deformation parameters were obtained using two-dimensional speckle tracking echocardiography. The transmural strain gradient was defined as the strain difference between subendocardial and subepicardial myocardium. Both diseased groups were further divided based on the median value of transmural strain gradient for the hemodynamics correlation. Results: Compared with the HCM group, the AS group had more preserved transmural longitudinal strain gradient (4.49 ± 1.3% vs. 3.61 ± 1.2%, p < 0.001), which was not significantly different from that of the healthy controls (4.49 ± 1.3% vs. 4.54 ± 1.0%, p = 0.975). And only in AS group the transmural circumferential strain correlated with myocardium mass index (r = −0.237, p = 0.008), and the hemodynamic profiles (LV ejection fraction and LA pressure) were correlated well with transmural strain gradient, in that the lower subgroup had a significantly lower LV ejection fraction and higher average E/E′. Conclusions: Myocardium hypertrophy from different etiology resulted in different layer-specific strain distribution pattern. The loss of an adequate transmural strain gradient correlated with hemodynamics and might reflect intrinsic myocardial dysfunction. Highlights: Hypertrophied myocardium may have difference deformation pattern. Layer-specific proved point 1. Transmural gradient defined as difference between subendo- and subepi-myocardium. This gradient correlated with hemodynamic parameters, especially in AS group.