Sottiaux T M
Intensive Care Unit, Clinique Notre Dame de Grâce, 212, Chaussée de Nivelles, 6041 Gosselies, Belgium.
Respir Care. 2001 Mar;46(3):255-62.
During pressure-support ventilation, tidal volume (V(T)) can vary according to the level of the patient's respiratory effort and modifications of the thoraco-pulmonary mechanics. To keep V(T) as constant as possible, the Siemens Servo 300 ventilator proposes an original modification of pressure-support ventilation, called volume-support ventilation (VSV). VSV is a pressure-limited mode of ventilation that uses V(T) as a feedback control: the pressure support level is continuously adjusted to deliver a preset V(T). Thus, the ventilator adapts the inspiratory pressure level, breath by breath, to changes in the patient's inspiratory effort and the mechanical thoraco-pulmonary properties. The clinician sets V(T) and respiratory frequency, and the ventilator calculates a preset minute volume. It has been shown that ineffective respiratory efforts can occur during pressure-support ventilation.
在压力支持通气期间，潮气量（V(T)）会根据患者的呼吸努力程度和胸肺力学的改变而变化。为了使V(T)尽可能保持恒定，西门子Servo 300呼吸机提出了一种压力支持通气的原始改进模式，称为容量支持通气（VSV）。VSV是一种压力限制通气模式，它将V(T)用作反馈控制：持续调整压力支持水平以输送预设的V(T)。因此，呼吸机逐次呼吸地调整吸气压力水平，以适应患者吸气努力和胸肺机械特性的变化。临床医生设定V(T)和呼吸频率，呼吸机计算预设的分钟通气量。研究表明，在压力支持通气期间可能会出现无效的呼吸努力。
