患儿，男，7岁。面部水肿6天，剧烈头痛、烦躁不安1天。査体：血压180/110mmHg,双睑水肿，咽红，扁桃体II度肿大，心肺听诊无异常，肝肋下1.5cm，腹软，双下肢凹陷性水肿，尿常规：尿蛋白（+++),尿红细胞10-20个/HP,白细胞0-2个/10>,血尿素氮5.6mmol/L。紧急处理措施是

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