左室心肌致密化不全的磁共振表現(xiàn)及其與心功能關(guān)系的研究
[Abstract]:Background: left ventricular myocardial densification (Left Ventricular Non-compaction,LVNC) is a rare congenital cardiomyopathy characterized by abnormal trabecular reticulum and deep recess in left ventricular myocardium. Cardiac magnetic resonance (Cardiovascular Magnetic Resonance,CMR) has high tissue resolution, large field of vision and "one-stop" examination, and can more accurately display the distribution of noncompact myocardium. Compared with echocardiography, it is easier to detect the mural thrombus inside the crypt by displaying the changes of the dense and non-compact myocardium in the cardiac cycle in real time and dynamically. Objective: to investigate the MRI features of LVNC and the relationship between the involved myocardial segment and cardiac systolic function. Methods: from September 2014 to January 2017, 29 patients with LVNC were enrolled in the first affiliated Hospital of Nanchang University. All the patients were examined with CMR after clinical, echocardiographic or CMR examinations. Evaluation of left ventricular ejection fraction (LVEF),) by cardiac function analysis software (LVEDV), left ventricular end-diastolic volume (LVESV). According to the 17 segments method of AHA, the myocardial segments of patients with incomplete densification of left ventricular myocardium were counted, and the thickness of (NC) and (C) in all segments of myocardium were measured at the end of diastole. The ratio of the two is calculated at the same time. To compare the difference of cardiac function parameters between LVNC patients and normal controls, and to analyze the correlation between left ventricular ejection score (LVEF) and the number of involved segments, and the ratio of thickness of non-densified myocardium to densified myocardium (NC/C). Results in 29 patients with LVNC, the number of nondensified myocardial segments was 192.The average number of non-densified myocardial segments per LVNC patient was 6.4 鹵3.1, and the ratio of non-densified myocardium to densified myocardial thickness was 2.9 鹵0.8. Myocardial densification was found in the apical cap of all patients. Except for the apical part of the heart, the number of segments from more to less was the apical part of lateral wall (99%), the apical part of interwall (98%), and the apical part of anterior wall (87%), but the basal segment of ventricular septum did not accord with myocardial densification. There were significant differences in the basic parameters of CMR between the two groups (the thickness of the compact layer of NC/C, the number of incomplete segments of myocardial densification, the number of LVEF, LVESV and LVEDVI). The ejection fraction was negatively correlated with the number of myocardial segments and the mean value of NC/C. Conclusion the dynamic process of the delamination characteristics of densified incomplete myocardium in each cardiac cycle can be accurately and clearly displayed by: 1 / 1 CMR. The most common site of densified incomplete myocardium is apical, proximal, lateral and anterior wall of left ventricle. However, there were no significant differences in the parameters of CMR6 between the patients with ventricular septal basal segment and the healthy control group (mean number of NC/C,C, myocardial densification, ejection fraction (LVEF), LVESV and LVEDVI), and there was no significant difference between the patients with ventricular septal basal segment and the healthy control group (P > 0.05). There was significant difference between the two groups in the average number of myocardial densification segments. The ejection fraction measured by CMR was negatively correlated with the number of myocardial segments in accordance with the criteria of myocardial densification and the NC/C mean of myocardial segments with incomplete densification.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R542.2;R445.2
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