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虽然心房除极波改变对诊断心房超负荷,心房传导阻滞及心律紊乱十分重要,但直到1979年,国内才由许群等首次报告了50例正常人 P 向量环的测
Although the atrial depolarization in addition to changes in the diagnosis of atrial overload, atrial block and heart rhythm disorder is very important, but until 1979, Xu Qun et al first reported 50 cases of normal P vector ring test