Pre op ultrasound with chest auscultation and arterial blood gas, after extubation ultrasound with chest auscultation and blood gas, 12hrs chest auscultation with ultasaound, 24 hrs chest auscultation and ultrasound to see atelectasis inclusion criteria: age 18 to 70 yrs age ASA I and II robot assisted pelvic surgeries in steep trendelenburg position~exclusion criteria: cardiac disese severe obstructive and restrictive disease upper airways infection ASAIII and IV
Pre op ultrasound with chest auscultation and arterial blood gas, after extubation ultrasound with chest auscultation and blood gas, 12hrs chest auscultation with ultasaound, 24 hrs chest auscultation and ultrasound to see atelectasis