Exam II: 4C Lung Volumes & Capacities Flashcards
What can a Spirometry help do?
1) Distinguish between different lung diseases
2) Determine the severity of functional impairment
3) Monitor the treatment of a lung disorder
What is a spirometry?
Diagnostic tool for the measurement of the breathing capacity of the lungs
How does a Spirometry measure this?
Plots a tracing of the lungs volume against time (in seconds)
What is an “Incentive Spirometry”?
- Encourages voluntary deep breathing by providing visual feedback about inspiratory volume.
- Patient inhales until a preset volume is reached, then sustains the inspiratory volume by holding his or her breath for 3-5 seconds.
What does the Incentive Spirometry reduce the risk of?
Atelectasis and pulmonary consolidation
What is Tidal Volume (TV)?
***The amount of air that moves INTO and OUT of the airways w/ each inspiration and expiration during “normal quiet breathing”
-average is 500 ml
What is Minute Ventilation (MV)?
TOTAL volume of air taken in by the body during 1 minute
What is the formula for Minute Ventilation (MV)
MV = TV x RR(respiratory rate)
What is the Anatomical Dead Space?
The portion of the TV (tidal volume) that remains in the nose, pharynx, larynx, trachea, bronchi, and terminal bronchioles
(i.e. air that does NOT participate in gas exchange!!)
What is Alveolar Ventilation (AV)?
TOTAL volume of air that reaches the sites of gas exchange during
1 minute
What is the formula for Alveolar Ventilation (AV) ?
AV = (Tv-ADS) x RR
What is the Inspiratory Reserve Volume? (IRV)
The amount of air you can INSPIRE ABOVE your NORMAL TV (tidal volume)
**Big dip on the top left side. **
What is Expiratory Reserve Volume (ERV) ?
The amount of air you can EXPIRE ABOVE your NORMAL TV (tidal volume)
***(THE BIG DIP on the bottom of Lung graph)
What is Residual Volume (RV)?
The amount of air that remains the respiratory system AFTER a FORCED EXPIRATION!
***Need this because you don’t want the alveoli to collapse!
What is the Functional Residual Capacity (FRC)?
The SUM of the RV (residual volume) & ERV ( expiratory reserve volume)
“RV+ ERV”
***You breath normally like this!
