 compliance is the compliance calculate when thorax is closed, the pulmonary compliance is the compliance calculated when thorax is opened After operation chest X-ray are daily done and blood samples as needed. Were recorded death, time of extubation,duration of non invasive ventilation,of Intensive Care Unit stay and of total hospital stay, troponin peak, lactates, blood gases, ionogram and count.Variations of compliance is analyzed through one factor paired Anova or Wilcoxon paired test. Decrease of compliance and respiratory complications are analyzed through binomial logistic regression. 