The following data are obtained from a 45-year-old man receiving mechanical ventilation in the ICU: exhaled tidal volume 500 mL/breath, peak inspiratory pressure 40 cm H2O, plateau pressure 35 cm H2O, positive end-expiratory pressure 10 cm H2O.
Which of the following is the static compliance (mL/cm H2O)?
A. 30.5
B. 25
C. 20
D. 16.7
答案解析:
顺应性定义为任何给定压力变化的体积变化。它有两种不同的测量:静态顺应性(Cstat)和动态顺应性(Cdyn)。Cstat反映了无气流期间的肺顺应性。平台压是气流停止时吸气末的压力。这将解释胸壁和肺顺应性。
在气体继续流动时测量Cdyn。这也反映了肺和气道阻力的贡献。Cdyn = VT/(气道峰压-PEEP)。Cstat是潮气量与平台压和PEEP之差的比值。静态顺应性 = VT/(气道平台压[Pplat]-PEEP)= 500/(35-10)= 20。
正确答案:C
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