目的：分析长期机械通气患者循环系统并发症发生情况及相关因素。
Objective: to analyze the incidence of circulatory systemic complication and associated factors in long term mechanical ventilation patients.
心脏是人体循环系统的核心，心脏的活动是由生物电信号引发的机械收缩。
Heart is the core of the cyclical system of human body. The activity of the heart is the mechanical contraction caused by the biological electrocardiac signal.
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