患者，男性，60岁。腹痛，呕吐，停止排气排 便。查体：腹胀，肠鸣音亢进，白细胞12 x 109/L，血清钾3 .2mmol/L，血清钠 136mmol/ L，血清氯99mmol/L。患者的心电图检查可能出现的异常是

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