Spirometry

Question 1

What is spirometry

Answer 1

Method of measuring the volume of air that the patient is able to expel from the lungs after maximal inspiration

Question 2

What is the measured values that spirometry gives

Answer 2

FVC

FEV1

Flow volume curve

Peak expiratory flow

Lung volumes

Transfer factor estimates (compliance)

Question 3

Describe a volume/time curve

Answer 3

Volume (litres) along vertical
Time (seconds) along horizontal

Shows

TLC - breath in for total lung capacity
RV - exhale as fast as possible to residual volume
FVC - volume produced in vital capacity

Can be used to show post bronchodilator

Question 4

Describe a flow/volume plot

Answer 4

PEF at the top
Moves down by FEF25, 50, 75 - flow at point in which 25% etc. of total volume to be exhaled has been exhaled

FVC sits along the bottom

Question 5

Define airways obstruction

Answer 5

<0.7 of FEV1/FVC ratio

Question 6

What conditions would have airways obstruction

Answer 6

Asthmas - would show great response to salbutamol

Question 7

What would airways restriction show

Answer 7

Normal of high FEV1/FVE and reduced FVC