Preliminary Study on Evaluate the Segmental Myocardial Systolic Function of Myocardial Infarction Patients by Velocity Vector Imaging

Objective: This research compares longitudinal and radial direction movement characteristics bymeans ofVelocityVector Imaging(VVI),namely,the same segments of normal myocardium,infarted myocardium and non-infarcted myocardium under the resting state.Then evaluates clinical practice value of Velocity vector imaging(VVI) on coronary heart disease myocardial infarction patients segmental systolic function.Methods: Thirty healthy volunteers and thirty myocardial infarction patients were selected,andwedividedthemintothenormalgroupandthemyocardialinfarctiongroup.Weselectclearlyapicalfour-chamber,apicaltwo-chamber,apical left ventricular long axis views,axis view at papillary level,muscle level and nearly apical level.Quantitative analysis velocity(Vs),strain(S),strain rate(SR) about radial motion of left ventricle anterior septum,anterior,lateral wall,inferior,posterior wall and posterior septal;And longitudinal motion of infarction segments,non-infarcted segments and normal segments from basal segment,middle segment and apical segment.Results: From basal segment to apex,the velocity gradient descent,but the strain rate and strain are the same.Radial velocity,strain rate and strain among the different walls of the left ventricle are the same.Myocardial segmental indicators of VVI declined significantly at infracted area then non-infracted segments in its surrounding areas.Conclusions: This research indicates that VVI can be used as non-invasive diagnosis of myocardial infarction,which can help to identify or exclude the diagnosis of coronary artery disease myocardial infarction.