患儿，10岁，发热2天伴水样腹泻2次，2小时前突然感胸闷不适、腹痛、烦躁不安，晕厥1次。查体：T38.50C,面色苍白，气稍促，BP60/40mmHg,HR160次/分，心律不齐，心音强弱不一，心界扩大。有助于临床诊断的主要依据是

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