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1引言经常规内科药物和吸氧治疗无效的严重支气管哮喘持续状态并呼吸衰竭的病人必须进行人工通气。严重哮喘发作时，气过阻力显著升高和脱过度膨胀，放正压通气易致气压伤和低血压等严重并发症。因此，有学者[1]提出低通气、低频率的允许性高碳酸血症（PHC）的通气方式，或控制
1 Introduction Conventional medical drugs and oxygen inhalation therapy for patients with severe persistent bronchial asthma and respiratory failure must be performed manually. Severe asthma attack, the air-resistance was significantly increased and off excessive expansion, put positive pressure ventilation can cause severe pressure and other serious complications. Therefore, some scholars [1] proposed low ventilation, low frequency of permissive hypercapnia (PHC) ventilation, or control