患者，男，56岁。既往有“Ⅱ度房室传导阻滞”的病史。今晨于跑步时突然昏聩不语，面色苍白，鼻鼾息微，目合口开，大汗淋漓，四肢厥冷，二便自遗。唇淡舌润，脉微欲绝。查体:血压80/40 mmHg，神志不清，心率42次/分。此昏迷的证型是

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