Table 1 Inclusion and exclusion criteria of the study
Inclusion criteria | Exclusion criteria |
|---|---|
Age ≥ 18 years ASA class 2 or 3 Major abdominal surgery General anaesthesia | Preceding surgery within 30 days Thoracotomy History of lung resection Oxygen therapy at rest Any kind of acute pulmonary morbidity Patient on ventilatory support at surgical admission |