QUESTION 1 Indicate whether each statement is correct or incorrect regarding the

Question

QUESTION 1 Indicate whether each statement is correct or incorrect regarding the following values from this 5 foot 9 inch male. VE-8 L/m f= 16/min PaCO2 35 mm Hg PECO2 25 mm Hg Vt = 500 ccs A. correct -VD is lower than normal incorrect - VD/VT is lower than normal the subject has significant shunting QUESTION 2 Indicate whether each statement is correct or incorrect for this 160 pound person with the following values. Vt = 400 ml f= 24/min PaCO2-50 mm Hg PECO2 20 mm Hg A. Correct VE 9.6 L/min The patient is hypoventilating : VD volume = 160 ml B. Incorrect C. Incorrect Minute dead space ventilation = 3.84 Umin

Explanation / Answer

1. a. VE = minute ventilation.

f= Respiration frequency (RR)

Ve= VT X f

Vt= Ve/F=8L/mim /16/min=0.5 L= 500ccs

Statement is correct or A.

b. VD/VT= (PaCO2 – PECO2)/PaCO2

VD/0.5=35-25/35= 500 X 0.2857=142.85 ml or cc

This level is lower than the normal level of 150 ml.

The statement is correct or B.

c) VT or tidal volume is the amount of air that passes in and out of the lungs.

VD/VT = (PaCO2 – PECO2)/PaCO2= (35-25)/35=0.2857

Normal VD/VT levels are 0.28-0.33

The statement is incorrect or B.

d) Shunting occurs supply of air or ventilation falls to the perfused region despite adequate supply of blood. As VD/VT levels are normal, there is no pulmonary shunting. These levels would rise in pulmonary shunting.

The statement is incorrect or B.

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