Assessment of myocardial perfusion by the microbubble replenishment parameters of real-time myocardial contrast echocardiography / 中华超声影像学杂志

ABSTRACT

ObjectiveTo assess myocardial perfusion by the end-systolic and end-diastolic replenishment parameters of real-time myocardial contrast echocardiography (MCE).MethodsTwenty-one patients with myocardial infarction(MI) and normal control group of 6 cases underwent intravenous realtime myocardial contrast echocardiography via slow and homogeneous venous injections of SonoVue.MCE images were obtained from the apical 4-chamber,2-chamber,and long-axis views.According to the exponential function:y(t) =A [1 - e-kt] + B,the time intensity curves were obtained.By an off-line ECG triggering and curve fitting,the replenishment parameters A value,k value,A × k value were obtained separately from end-systolic and end-diastolic images.ResultsIn normal control group,the end-systolic replenishment parameters A value,k value,A × k value were all lower than that of the end-diastolic replenishment parameters[(6.21 ± 2.69)dB vs (7.93 ± 3.66)dB,P ＜0.05；0.36 ± 0.15 vs 0.42 ± 0.19,P ＜ 0.01 ;2.88 ± 1.29 vs 3.39 ± 1.61,P ＜0.05,respectively].The end-diastolic replenishment parameters were found significantly greater variability than the end-systolic values (variation coefficient CV:A value 46.2％ vs 43.3％,k value 45.2％ vs 41.4％,A× k value 47.5％ vs 44.8％,all P ＜0.05).In 21 patients,the end-systolic replenishment parameters in myocardial segments supplied by infarct-related coronary artery were significantly lower than that in myocardial segments supplied by non - infarct - related coronary artery.ConclusionsThe end-systolic and end-diastolic replenishment parameters of real time myocardial contrast echocardiography can assess myocardial perfusion.The variability of the end-systolic replenishment parameters is smaller than that of the end diastolic parameters.Significant variability in k-value suggests that this parameter is best suited for before-after study in the same patient.