Homework 2

1. PI02 = (PB – PH20) x FI02

(750-47) x .6 = 421.8

2. PA02 = 421.8 – Paco2 = 421.8 – ( 42 ) = 421.8 - (52.5) = 369.3

r ( .8)

3. P(A-a)o₂ = 369 –145 =224 mmHg

4. a/A= 145/369 = 39%

5. FI02 D Pa02 100 torr

x = 100 + Paco2 = 100 + 42

a/A r . .39 .8

-----------------------------------

PB –P H20 ( 750-47)

= 100 + 52.5

.39 _____

703

= 256.4 + 52.5

703

= 44%

6) VT = VE/f = 12.75L = .85L

15

7) VD anat = 176 lbs x 1ccl lb x ½ (trached) = 88cc

8. VD/VT = Paco₂ – PEco₂ = 42-32 = 10/42 = 24%

Paco₂ 42

9. VD phis = V_T x VD/_VT = 850 x .24 = 204cc

10. VA = VT – VD = 850 – 88 = 762

or VT – VDphis = 850 – 204 = 646

11. VA = VE – VD = 12.75L – (88 x 15)

= 12.75L –1.320l = 11.43L

or VE – VB phis = 12.75L –(204 x 15)

= 12.75L –3.06L = 9.69L

CB/dc Homework 2