Question

Given the following spirometry and patient information: Height: 172 cm Age: 35 Weight: 190 lbs Gender: Male Tidal volume: Cycle 3 inhale: 0.48 L Cycle 3 exhale: 0.46 L Cycle 4 inhale: 0.50 L Cycle 3 exhale: 0.42 L IRV: 2.9 L ERV: 1.1 L RV: 1.0 L Calculate the following: (a) Calculate Inspiratory capacity ______________ (1 pt) (b) Calculate Expiratory capacity ______________ (1 pt) (c) Calculate Residual capacity _______________ (1 pt) (d) Calculate Total Lung capacity ______________ (1 pt) (e) Calculate Predicted Vital capacity ___________ (.5 pt) (f) Calculate Observed Vital capacity ___________ (1 pt) (g) What is Subject’s observed vital capacity to predicted vital capacity as a percentage? ____ (.5 pt).

Answer 1

Taking vital capacity average= 0.48+0.50/2= 0.49

Part a )

inspiratory capacity= inspiratory residual volume+tidal volume

Substituting values

Inspiratory capacity= 2.9+0.49= 3.39ml

Part b

Expiratory capacity= tidal volume+ expiratory reserve volume

Tidal volume using average of expiratory tidal volume

=0.46+0.42/2= 0.44

Substituting value

Expiratory capacity=0.44+1.1=1.54ml

Part 3)

Residual capacity=reserve volume+ expiratory reserve volume

Substituting values

Residual capacity=1+1.1= 2.1ml

Part 4

Total lung capacity= expiratory reserve volume+ tidal volume+ reserve volume+inspiratory reserve volume

Total lung capacity=1.1+0.49+1+2.9=5.49liters