The alveola arterial oxygen gradient[P(A a)DO, p(A a,DO)], oxygenation ratio(PaO/FiO,pa,O / FI0)and alveolar dead space fraction(Vd / Vt) were calculated .
The alveola arterial oxygen gradient[P(A a)DO, p(A a,DO)], oxygenation ratio(PaO/FiO,pa,O / FI0)and alveolar dead space fraction(Vd / Vt) were calculated .
RFN组,p(A-a,DO)升高,Vd/Vt增大,pa,O/FI0降低,且呈持续状态,术后8h时和基础水平相比,差异仍具显著性。