男，40岁，急性肠梗阻2天，呕吐频繁、乏 力、口渴、尿少、口唇干燥、眼窝下陷、皮肤 弹性差，脉搏116次/分。化验：Hb 163g/L， 血细胞比容0 . 55，血清钠140mmol/L，血清钾 4mmol/L。低钾血症不常见于

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