患者，男性，62岁。既往有高血压病史，腹痛、腹泻3天。查体：神志清，呼吸促，双下肢水肿，体温39℃，血压90/60mmHg，腹平软，无压痛。血肌酐586μmol/L，pH7.23，PaO260mmHg，PaCO224mmHg，BE-8.4mmol/L，K+6.3mmol/L。该患者目前肾脏替代治疗最适宜的措施是

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