心肌梗死病人QT离散度与存活心肌关系的研究

Study of The Relationship between QT Dispersion and Myocarolial Viability in Patients with Myocardial Infarcfed

目的探讨心电图QT离散度(QTd)与存活心肌的关系。方法对45例急性和陈旧性心肌梗死病人行心电图、心肌灌注和心肌代谢显像,计QTd值。结果①QTd≤70ms时判断梗死部位存活心肌的敏感性为82.8%,特异性为88.9%,准确性为84.2%;②QTd与坏死心肌程度呈正相关,与存活心肌程度呈负相关,相关系数分别为0.16(P<0.001)和-0.44(P<0.001);③存活心肌检测阳性组QTd显著小于存活心肌检测阴性组(P<0.001)。结论QTd与坏死心肌程度和存活心肌程度呈著相关,提示QTd可作为检测心肌梗死存活心肌“金标准”的核医学的筛选试验。

Objective To investigate the relationship between QT dispersion and myocardial viability. Methods Forty - five patients with acute myocardial infarction and old myocardial infarction underwent electrocardiogram for calculate QTd.The data of 18F- FDG imaging and 201TL perfusion imaging were collected. Results ①If QT dispersion QTd≤70 ms, the sensitivity was 82.8 %, specificity was 88.9 % and accuracy was 84.2 % to predict viable myocardium in the infarct region. ② Necrosis myocardial extent was related to QT dispersion（ P 〈 0. 001 ）positively. The extent of viable myocardium in the infarction region was related to it（ P 〈 0. 001 ） negatively. ③QTd in the group of positive viable myocardium was significantly less than that of negative viable myocardium （ P 〈 0.001 ）, Conelusion QT dispersion is related to the extant of necrotic myocardium significantly.