Midterm Key terms

Question 1

which lung capacity is involved in denitrogenation?

Answer 1

FRC

Question 2

how to caluculate “how many minutes till desaturation” I think we would be given FRC and pt weight.

Answer 2

In think the formula is

Minutes to Desaturation = FRC / V_O2

V_O2 is oxygen consumpsion V_O2= kg^0.75 x 10 (mlO₂/min)

Question 3

What’s the formula for anatomical deadspace and what is formula for deadspace ventilation

Answer 3

deadspace = 2.2 mL x pt wt in kg

deadspace ventilation V_DANAT = deadspace x RR

Question 4

what is the forumula for cabon dioxide production

Answer 4

V_co2 = V₀₂ x (0.8)

Question 5

How would you calculate the total ventilation required to remove the CO₂ that is produced each minute

Answer 5

Note: this is simply minute ventilation (per Dr. Halls Ventilation lecture from CCC)

V_E = V_A + V_DANAT

Question 6

Ok I don’t know how the question will be asked but I would know that:

Answer 6

1 time constant = FRC / [V_A x RR]

V_A = [V_co2x P_ACO2] / P_BAR (this is alveolar ventilation) or can be expressed as

**V_A= V_CO2 / F_ACO2 ** where F_ACO2 = P_ACO2 / P_BAR (this formula is the fractional concentration of CO₂ that exists in the lungs. (F_ACO2 generally = 0.058 )

Question 7

what bone associated with the least amount of movement when taping an ETT

Answer 7

zygomatic

Question 8

what is the molecular weight of O₂

Answer 8

16 daltons

Question 9

the atlanto-occiptal gap is normally about how many degrees

Answer 9

30-35 %

Question 10

what is the volume of a cylinder ?

Answer 10

ETT is a cylinder

V = πr²L

L=length