Question

# Use the following data from a patient's medical chart to answer the next 3 questions Blood...

Use the following data from a patient's medical chart to answer the next 3 questions
Blood Pressure.................................... 98/60 (mm Hg)
Heart Rate........................................... 104 BPM
Central Venous Pressure.................... 3 mm Hg
Respiratory Rate (f)............................. 18 breaths/min
Tidal Volume (VT)……………………... 350 ml/breath
Total Lung Capacity (TLC)..................   6.9 L
(Forced) Vital Capacity (FVC)………..    4.8 L
PaO2 .........[normal O2 = 100] 70 mm Hg
PaCO2 .......[normal CO2 = 40] 50 mm Hg
pHa...................................................... 7.32
[HCO3-]................................................ 30 mEq/L
This patient's Alveolar Minute Ventilation (VA) is _______ L/min

A. 1.5
B. 1.8
C. 2.25
D. 2.7
E. 3.5
F. 3.75
G. 5.25
H. 5.4

I. 6.3

Alveolar minute ventilation

Alveolar ventilation is the amount of gas that enter alveoli per min.

It can be calculated by the following formula

Alveolar ventilation = ( tidal volume_ dead space ) × respiratory rate

Here,

Tidal volume=350ml / breath

Respiratory rate=18 bt/ min

So

Alveolar ventilation ( VA) = (tidal volume _ dead space)× respiratory rate

VA=( 350 ml/ breath _200 ml/ breath )× 18 breath/ min

VA= 50ml/ breath × 18 breath/ min = 2700ml/ min

Now convert ml/ min to liter/ min by dividing by 1000

2700ml/ min ÷ 1000= 2.7 L/ min

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