Ventilation Calculations

Question 1

What is normal Minute Ventilation

Answer 1

4-6L/min

Question 2

What is normal Alveolar Minute Ventilation

Answer 2

4.2L/min

Question 3

Formula for Minute Ventilation(Ve)

Answer 3

Tidal Volume(Vt) x Respiratory Rate(RR)

Question 4

Formula for Alveolar Minute Ventilation

Answer 4

(Tidal Volume(Vt) - Dead Space) x Respiratory Rate(RR)

Question 5

What is Minute Ventilation(Ve)

Answer 5

Volume of air inhaled/exhaled in one minute.

Question 6

What is Alveolar Minute Ventilation

Answer 6

Volume of air/gas that reaches the respiratory zone(alveoli) and participates in gas exchange per minute.

Question 7

Formula for P(a-et)CO2

Answer 7

PaCO2 - ETCO2

Question 8

What is P(a-et)CO2 gradient

Answer 8

amount of co2 in the arterial blood vs expelled out of the lungs. Monitors ventilation.

Question 9

What is normal P(a-et)CO2 gradient

Answer 9

2-5mmHg

Question 10

What is the Vd/Vt(dead space) formula

Answer 10

(PaCO2- PetCO2) / PaCO2

Question 11

What is normal dead space

Answer 11

0.25-0.40 (25-40%)

Question 12

What is dead space to tidal volume ratio

Answer 12

the percentage of each breath that does not participate in gas exchange.