Echocardiographic evaluation of myocardial impact injury caused by eccentric aortic regurgitation / 中国医学影像技术

ABSTRACT

Objective: To explore the effect of transthoracic color Doppler echocardiography on evaluating myocardial impact injury caused by eccentric aortic regurgitation (AR). Methods: Transthoracic color Doppler echocardiographic imaging data were collected in 26 cases with local deformation of some part of the ventricular septum or left ventricular free wall rammed by moderate and above eccentric AR, and the morphological characteristics of ventricular wall impact injury were analyzed. Results: Myocardial impact injury caused by eccentric AR located at the basal-mid segment of ventricular septum or left ventricular wall (26/26, 100%). Both inferoseptal and inferior wall were impacted in 4 cases (4/26, 15.38%), only inferior wall were impacted in 5 cases (5/26,19.23%), both inferior and inferolateral wall in 13 cases (13/26, 50.00%), inferolateral wall in 2 cases (2/26, 7.69%), while inferoseptal, inferior and inferolateral wall all were impacted in 2 cases (2/26, 7.69%).No anterolateral, anterior nor anteroseptal wall was impacted. Local dilatation was observed at the impacted wall in all cases (26/26, 100%). Severe hypokinesia was detected in 6 cases(6/26, 23.08%), mild hypokinesia in 10 cases(10/26, 38.46%),while normal motion was observed in the rest 10 cases(10/26, 38.46%). In addition to local wall dilatation and hypokinesia, myocardial fibrosis could be observed from LGE images in one case. Local perfusion and metabolism decreased on radionuclide perfusion images in severe cases, but not in mild cases. Conclusion: Moderate and above eccentric AR can cause damage to some part of the wall impacted directly by the eccentric aortic regurgitation, and the location and extent of damage can be evaluated using color Doppler echocardiography.