Milanés J C, Carrasco H A, Bellera J, Torres A, Fuenmayor A
Arch Inst Cardiol Mex. 1982 Nov-Dec;52(6):477-82.
The present study determines the degree of usefulness provided by the qualitative analysis of the high frequency EKG with Mc Fee's triaxial system in the detection of myocardial damage during the incipient stages of Chagas disease. The results show that only the descending phase of the wave which corresponds to the vertical axis, i.e. Y, detects some kind of cardiac damage in the initial stages of disease with a high specificity, if normal values of 0-3 notches are taken, but in detriment of the sensitivity which is relatively low. This method did not prove to be useful in the longitudinal study of chagasic patients. It is a method which is very simple to perform with an inter-observer variability of 7%.
本研究确定了使用麦克菲三轴系统对高频心电图进行定性分析，在恰加斯病初期检测心肌损伤时所提供的有用程度。结果表明，仅对应于垂直轴（即Y轴）的波的下降阶段，在疾病初期能检测到某种心脏损伤，若采用0 - 3个切迹的正常值，则具有较高的特异性，但敏感性相对较低。该方法在恰加斯病患者的纵向研究中未被证明有用。这是一种操作非常简单的方法，观察者间变异率为7%。
