The value of left ventricular opacification for measuring left ventricular remodeling parameters in ST-elevation myocardial infarction patients / 中华超声影像学杂志

ABSTRACT

Objective:To investigate the value of left ventricular opacification (LVO) for measuring left ventricular (LV) remodeling parameters in ST-elevation myocardial infarction (STEMI) patients.Methods:Sixty-nine STEMI patients in Renmin Hospital of Wuhan University from April 2018 to December 2019 were enrolled. The apical four-chamber, three-chamber and two-chamber views of LV were collected with unenhanced and contrast-enhanced modes. According to the endocardium display in the unenhanced mode, all patients were divided into two groups excellent image quality group ( n=23) and poor image quality group ( n=46). The endocardial segment display rate and mural thrombus diagnosis rate were compared between the two groups, and the improvement of LV overall image quality and LV apex display were evaluated in the poor image quality group.LV end diastolic volume (LVEDV), LV end systolic volume (LVESV), LV ejection fraction (LVEF) and LV global longitudinal strain (GLS) were measured with unenhanced and contrast-enhanced modes, respectively. The differences and repeatability of LV remodeling measurements of LVEDV, LVESV, LVEF and GLS in each group were compared with unenhanced and contrast-enhanced modes, and the feasibility and accuracy of GLS in contrast-enhanced mode were evaluated. Results:①Regardless of the image quality in the unenhanced mode, the display rate of endocardial segment in the contrast-enhanced mode was higher than that in the unenhanced mode (all P<0.05). ②For the poor image quality group, the overall image quality of LV and the display of LV apex were significantly improved in the contrast-enhanced mode (all P<0.05). ③For the poor image quality group, LVESV in contrast-enhanced mode was higher, while LVEF and GLS were lower than those in the unenhanced mode (all P<0.05). ④The correlation between GLS measured in contrast-enhanced and unenhanced mode was 0.912, and most of the measurements in the two modes were within the consistency threshold. For the poor image quality group, compared with GLS measured in the unenhanced mode, the correlation between GLS and LVEF measured in the contrast-enhanced mode was higher (0.731 vs 0.709). ⑤For the excellent image quality group, the interclass correlation coefficients (ICC) of most parameters were increased slightly in the contrast-enhanced mode, especially among interobservers. For the poor image quality group, the intra- and inter-observers′ ICC of LV remodeling mearsurements were increased significantly in the contrast-enhanced mode. Conclusions:LVO can more clearly display the LV structure of STEMI patients and obtain more repeatable LV remodeling measurements such as LVEDV, LVESV, LVEF and GLS, especially for patients with poor image quality.