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压力支持通气(PSV)是一种部分支持患者呼吸的通气模式,其效果依赖于呼吸机与患者自主呼吸之间的相互协调。在压力支持水平恒定条件下,吸气时气道压力上升速度即气道压力上升到设置压力的时间可能与患者的呼吸功有关。作者通过调整气道压力上升速度,探讨和评价限制性通气障碍患者在应用PSV时,气道压力上升速度对呼吸功的影响。 研究对象和方法:12例具有限制性通气障碍的呼吸功能不全患者纳入观察组。患者取半卧位,首先接呼吸机自主呼吸,记录气体峰值流速、潮气量(VT)、呼吸频率(f)、内源性PEEP(PEEPi)、口腔闭合压(P0.1)、呼吸功(WI);改变呼吸模式为PSV(PS:15cmH_2O、触发灵敏度:1L/min),调整气道压力上升到设置压力的时间分别为0.1s、0.5s、1.0s、1.5s(T0.1组、
Pressure Support Ventilation (PSV) is a ventilatory mode that partially supports the breathing of a patient, the effect of which depends on the coordination between the ventilator and the spontaneous breathing of the patient. At constant pressure support levels, the time taken for the airway pressure to rise at inhalation, ie when the airway pressure rises to the set pressure, may be related to the patient’s work of breathing. By adjusting the rate of increase of airway pressure, the author explores and evaluates the effects of airway pressure rise on the work of breathing in PSV patients with restrictive ventilatory disorders. PARTICIPANTS AND METHODS: Twelve patients with respiratory insufficiency with restrictive ventilatory disorders were enrolled in the observation group. The patient took the semi-recumbent position, and then took the spontaneous respiration of the ventilator. The peak gas flow rate, tidal volume (VT), respiratory rate (f), endogenous PEEPi, oral closure pressure WI). The time when the airway pressure increased to the set pressure was changed to 0.1s, 0.5s, 1.0s and 1.5s respectively by changing the breathing mode to PSV (PS: 15cmH2O, triggering sensitivity: 1L / min)