患者,男,62岁。左侧胸痛伴呼吸困难1天。疼痛呈持续性锐痛,咳嗽时加剧,无放射痛、发热。查体:BP110/80mmHg,呼吸急促,口唇发绀,双肺未闻及干湿啰音,P,亢进,各瓣膜区未闻及杂音,左下肢水肿。胸痛最可能的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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