患者，男，68岁。持续胸痛2小时，既往体健。查体：BP110/65mmHg，双肺呼吸音清，心率94次/分,心音低钝，A2>P2，心电图示V1-V6导联ST段弓背向上抬髙0.3-0.5mV，II、III和aVF导联ST段水平压低0.3-0.5mV。实验室检査:血清肌钙蛋白I平正常。最可能的诊断是

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