Scintigraphy In The Study Of Heart Functional Characteristic Of Silent Myocardial Ischemia

Objective:To observe and reveal the characteristic changes of heart function and myocardial blood perfusion in the patients with silent myocardial ischemia(SMI) and to raise the diagnostic accuracy and sensibility with scintigraphy in SMI.Materials and Methods:39 patients with silent myocardial ischemia,58 patients with myocardial ischemia accompany with angina(AN),46 healthy subjects and 73 patients with old myocardial infarction(OMI) were examined by myocardial blood perfusion tomography imaging and gated ventricular functional imaging. The pictures of myocardial blood perfusion tomography imaging were analyzed in routine method to observe the radioactivity changes on myocardial walls. The heart function parameters:left ventricular ejection fraction(EF), peak ejection rate(PER), peak filling rate(PFR), time of peak filling rate(TPFR), regional ejection fraction(REF) and regional wall motion(RWM) were gained from the gated ventricular functional imaging and their differences compared. When age is concomitant variable covariance analysis was taken, and SNK-Q analysis and multiple comparison ranking were taken then.Results:The SMI and AN groups displayed partial myocardial wall reversible radioactive defect or reduce in the pictures of myocardial blood perfusion imaging, in compared to the fixed radioactivity defect in OMI group. Most abnormal focus of SMI is solitary, and the number of abnormal segments in SMI and AN were less than that in OMI (p<0.01). The parameters obtained from the gated ventricular functional imaging, except TPFR, the differences of EF, PER and PFR had statistical significances (P<0.05) in the four groups. The value ranking of EF, PER and PFR is: OMI