患儿，女,9岁6个月。发热、心悸、双肘关节疼痛5天，体温最高38.61，恶风，汗出不解，口渴欲饮，心尖部可闻及2-3/6级吹风样收缩期杂音，双肘关节鹰嘴上方各触及无痛、质硬结节，大小约为1cm。舌质红，苔黄厚腻，脉滑数。心电图：一度房室传导阻滞。血沉55mm/h,AS0621IU/ml。该患儿的诊断是

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