Lecture 3 - Ventilation

Question 1

Standard temperature conversion equation?

Answer 1

Vst = Vat x (273/273+T)

Question 2

Standard Pressure Conversion Equation?

Answer 2

Vsp = Vap x (P-Psat/760)

Question 3

Calculating flow??

Answer 3

derive volume (L/min)

Question 4

Alveolar flow calculation?

Answer 4

V’A = f x (tidal volume - deadspace volume)

Question 5

Explain alveolar flow calculation?

Answer 5

dead space volume inhaled first, 2 lots of fresh air inhaled and converted, 3rd bit of fresh air is first part exhaled which is equal amount to dead space volume

Question 6

Calculating volumes of carbon dioxide (exhaled = alveolar + dead space)?

Answer 6

Total volume of gas x fraction of carbon dioxide

Question 7

Pressure and flow relation?

Answer 7

Flow = change in pressure / resistance

Question 8

Distribution of air flow resistance in lungs?

Answer 8

progressively, resistance increases with relation to larger surface area due to increase no. passages for air to flow

Question 9

Poiseuille-Hagen Law?

Answer 9

physical law giving pressure drop in a laminar flow through a constant cross section