obesity

1. OSA

1.1. O2 saturation in blood

1.1.1. O2 saturation<85% : central cyanosis

1.2. first 4 hrs of GA

1.3. commonly with patients receive opioids

1.4. after anesthesia :CPAP

2. post-operative hypoxia

3. might occur

4. post-operative hypoventilation

4.1. affect resp. centre

4.2. affect peripheral

5. incidence of deep vein thrombosis (DVT).

6. Difficult intubation.