患者，男性，37岁。既往无高血压、心脏病病史，确诊肺结核并住院治疗1个月。近2天出现明显咳嗽，咳出淡血丝样痰。今天上厕所排大便后出现胸闷、憋气、口唇和指甲发绀、面色苍白、大汗淋漓。该患者出现的新发症状最可能的诊断是

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