Preoxygenation = Denitrogenation

Question 1

why is th pt preoxygenated

Answer 1

to fill the FRC with O2

Question 2

How can you estimate the time it will take B4 the pre oxygenated Healthy pt desaturates after onset of Apnea?

Answer 2

O2 consuption is 250mL/min and 2500mL of O2 are found in FRC after pre oxygenation. it will take 10 min to use this O2
2500 mL / 250 mL/min = 10 min