determinants of the total cosine of the spatial angle between the qrs complex and the t wave (tcrt) implications for distinguishing primary from secondary t-wave abnormalities：对qrs波和t波的..

determinants of the total cosine of the spatial angle between the qrs complex and the t wave (tcrt) implications for distinguishing primary from secondary t-wave abnormalities：对qrs波和t波的空间夹角余弦因素总（tcrt）对鉴别原发性继发性t波异常的影响