结果：6927例中有t-T变化者19例，发生率为0.27%，19例中有18例无器质性心脏病，1例为阵发性室上性心动过速病人。
Results t-T change were observed in19patients among6927in-patients, the rate is0.27%, and18patients have not organic heart disease, 1case has paroxysmal upventricular techycardic disease.
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