患儿，男，11岁。发热伴心悸3天，4周前曾患细菌性咽峡炎，现心悸,头重身困，关节肿痛，气短乏力，舌质淡，苔腻，脉猫滑。体温38.5，心率112次/分，心音低弱，心电图示ST-T改变。该患儿的治法是

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