6岁男孩，有水肿，血尿3天。昨晚起气促，不能平卧，尿少。査体：370C，脉搏90次/分，血压20/13.3kPa(140/lOOmmHg),两肺有少量水泡音，心音无异常，肝右肋下2cm。尿常规：蛋白（+),红细胞20-30个/HP。首先应如何处理

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