Table 2.

Peri-operative Arterial Blood Gas Analysis.

ABG analysis	Patient 1	Patient 2
Pre-operative	On room air pH 7.412 PCO2 38.1 mmHg PO2 78.6 mmHg	On 2 liters/min O2 pH 7.395 PCO2 47.1 mmHg PO2 103 mmHg
First post-operative in ICU	FiO2 100%, PEEP 10 mmHg pH 7.42 PCO2 40 mmHg PO2 68.8 mmHg	FiO2 100%, PEEP 10 mmHg pH 7.335 PCO2 40.4 mmHg PO2 63 mmHg