The mean or median values for FEV1, FVC, MIP, MEP and the ratio between partial pressure of oxygen in arterial blood (PaO2) and

fraction of inspired oxygen (FiO2) were 101+-17, 102+-17, 66 (IQR: 59-74), 114 (IQR: 100-138) and 379+-49, respectively, before operation compared to 78+-18, 76+-18, 53 (IQR: 48-59), 85 (IQR: 73-95) and 331+-49 after operation (p<0.

The established weaning criteria was routinely followed in the ICU i-e improvement of the cause of Acute respiratory failure that led to the use of ventilation support, correction of arterial hypoxemia (arterial partial pressure of oxygen (PaO2) of greater than 60 mm Hg,

fraction of inspired oxygen (FiO2) of less than or equal to 0.