Spirometry Flashcards
What is the term for the normal volume of air which moves in and out of the lungs with each breath?
Tidal volume
What is the term for the volume of air which can be inspired beyond the tidal volume?
Inspiratory reserve volume
What si the term for the volume of air which can be expired beyond the tidal volume?
Expiratory reserve volume
The air which remains in the lungs even after strenuous expiration is called residual volume. Why is this important?
To prevent atelectasis
What is inspiratory capacity?
Tidal volume + inspiratory reserve volume
What is vital capacity?
The total volume fo exchangeable air
Tidal volume + inspiratory reserve volume + expiratory reserve volume
What is functional residual capacity?
The total volume of air in the lungs after a todal expiration
Expiratory reserve volume + residual volume
What is total lung capacity?
The sum kf all the lung volume
Vital capacity + residual volume
What lung volumes can be measured with spiromtery?
Any volume which does not include residual volume
What variables are used to predict a person’s spirometry results?
Age
Sex
Height
What is the forced expiratory volume?
The volume of air forcibly expired in one second
What percentage of the forced vital capacity should the FEV1 be?
70%
What is forced vital capacity?
The maximal volume of gas which can be expired from the lungs during a forced expiration from a full inhalation
What is peak expiratory flow?
The maximum expiratory flow that can be sustained for a minimum of 10milliseconds
What ‘artefacts’ could invalidate a spirometry reading?
Cough Glottis closure Early termination Effort not maximal throughout Leak Obstructed mouthpiece
