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目的探讨运用直接节段多频生物电阻抗分析方法(direct segmental multi-frequency bioimpedance analysis:DSM-BIA)评估维持性血液透析患者全身容量负荷变化的准确性。方法应用DSM-BIA测量患者单次血液透析前全身总水量(Total body water by DSM-BIA before hemodialysis:TBWDSM-pre)及透析后全身总水量(Total body water by DSM-BIA after hemodialysis:⊿T