PFT Review Set 3

Question 1

Definition and Measurement objective for Slow Vital Capacities (SVC) (4)

Answer 1

SVC is the volume of gas measured form a slow complete expiration after a maximal inspiration without forced or rapid effort.

• VC
• IC
• Vt
• ERV

Question 2

Test Technique for Slow Vital Capacities (SVC)

Answer 2

• Normal Vt 3-4 breaths
• Inhales maximally from resting expiratory level
• Exhales completely Or visa versa

Question 3

What can be inferred if RV% is high?

Answer 3

Air trapping has occurred; air can’t get out.

• Pay attention to RL/TLC
• Doesn’t necessarily imply COPD: just hyperinflation. It could still be Asthma IF TLC and FVC + FEV1 are lower than normal or normal.

Question 4

Does a DLCO impairment indicate airflow problems?

Answer 4

Nope, does not indicate obstructive or restrictive process

• Indicates pulmonary capillaries; could be pulmonary hypertension for example. perfusion/blood flow issue.