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Whether the pain is related to the mitral valve prola e or whether it is an epiphenomenon is controversial because it is common in the a ence of evident prola e. 不过，疼痛是否与二尖瓣脱垂相关，抑或只是一种偶发现象，对此人们尚有争议，因为这种疼痛即便是在无明显脱垂时也很常见。