7岁男孩，夏季突发高热2小时，惊厥3次,面色发灰，四肢凉，血压低，心肺无异常，脑膜刺激征阴性。应首先做哪项检查

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28965' and id < 2357971 and id<>'2357971' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28965' and id > 2357971 and id<>'2357971' order by id asc limit 5