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Wikipedia

Dead on arrival:

Dead on arrival (D.O.A.), also dead in the field and brought in dead (B.I.D.), is a term used to indicate that a patient was found to be already clinically dead upon the arrival of professional medical assistance, often in the form of first responders such as emergency medical technicians, paramedics, or police.

到院前死亡:

到院前死亡（Dead on arrival，簡寫D.O.A.）是一個醫學術語，泛指病患在送達醫院的急診室前已出現死亡的症狀，例如心肺功能停止。