Using the data below, perform the calculations necessary to evaluate the V/Q mat
ID: 3478152 • Letter: U
Question
Using the data below, perform the calculations necessary to evaluate the V/Q matching for oxygen, and select either correct or incorrect for the statements below. Pbar = 690 mm Hg, Inspired O2% = 40%, PaO2 = 145 mm Hg, PaCO2 = 55 mm Hg, respiratory rate = 30
PAO2 = 188 mm Hg
a/A ratio is within normal limits
This patient has significant low V/Q mismatch
This patient is hyperventilating
Correct
Incorrect
1.PAO2 = 188 mm Hg
2.a/A ratio is within normal limits
3..This patient has significant low V/Q mismatch
4.This patient is hyperventilating
A.Correct
B.Incorrect
Explanation / Answer
FIO2= Fraction of inspired oxygen= 40%
Patm= Atmospheric Pressure= 690mmHG
PH2O= Vapour pressure of water at 37oc which is always equals to 47mmHG
PaCO2=Partial pressure of CO2 which is equal to 55mmHG
RQ= Respiratory quotient is the ratio of CO2 produced divided by the oxygen consumed and it is typically 0.8
( 40* (690-47))-(55/0.8)
which is equal to PAO2=188.45mmHG
2 A- a ration is not in normal limits so this assumption is false
A-a gradient= 188-145=43mmHG
3 This assumption is true because the patient has lower V/Q mismatch
So the V/Q ratio is low
4; This assumption is fals because
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