Results FRC before and after alveolar recruitment manoeuvre with 5 cmH? 2 O PEEP were 48.5 13.5 ml and 103.5 21.2 ml respectively, that with 10 cmH? 2 O PEEP were 143 37.2 ml and 196 43 ml,15 cmH? 2 O PEEP were 166 34.2 ml and 241.5 42 ml.

• (166±34.；2)ml(前)/(241