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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. 不過，疼痛是否與二尖瓣脫垂相關，抑或衹是一種偶發現象，對此人們尚有爭議，因爲這種疼痛即便是在無明顯脫垂時也很常見。