Indicate whether each statement is correct or incorrect regarding the following
ID: 177130 • Letter: I
Question
Indicate whether each statement is correct or incorrect regarding the following values for a 130 pound 5 foot 2 inch tall female. A=Correct and B=Incorrect
VE = 7 L/m
f = 14/min
PaCO2 = 36 mm Hg
PECO2 = 25 mm Hg
VT = 500 ccs
VD is 0.58 L/breath
VD/VT is lower than normal
the patient is hyperventilating
- A. B.VT = 500 ccs
- A. B.VD is 0.58 L/breath
- A. B.VD/VT is lower than normal
- A. B.the patient is hyperventilating
Explanation / Answer
VD is dead space air. VT or VE is the tidal volume. VE is given as 7L/min; i.e. 7000ml/min = (7000/60) = 116.67 cm3 per second. So, statement 1 is incorrect.
VD/VT = (PaCO2 - PeCO2) / PaCO2
= (36-25)/ 36 = 0.305 (coming under normal range).
Normal values of VD/VT are 0.28 to 0.33. So, statement 3 is incorrect.
VD = VT * 0.305 = 7*0.305 = 2.135 L/min
f = 14 breaths in one minute are there.
So, VD = 2.135/14 = 0.1525 L/breath.
So, statement 2 is also incorrect.
Statement 4 is also incorrect. Normally 12-16 breaths per minutes are there. If the number of breadths is above 16, then the person is considered to be hyperventilating.
All four statements are incorrect.
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