Ventilation Flashcards
What does compliance affect?
Inflation of the chest cavity and inflation of the lung
What is affected by both compliance and airway resistance?
AMOUNT of air flow
What is minute ventilation and how is it calculated?
volume of airflow through the lung in 1 minute
Ve=total volume x breathing rate
Why is minute ventilation larger than alveolar ventilation?
because the alveoli only makes up 70% of the lung whereas conducting airways make up 30% of the lung
What is the most important measurement of ventilation?
alveolar ventilation because this is where gas exchange takes place
In what alveolus is there most air volume? (top or bottom)
volume top alveolus > volume bottom alveolus
In which area of the lung is ventilation greatest? (top of bottom)
Top
When does more elastic work occur?
high TV and low frequency
When does more resistance work occur?
low tidal volume and high frequency
Why is there less resistance work at higher lung volumes?
because the lungs are already filled with air so there is not much resistance from the airways
At what portion of a work curve do normal people breathe at?
the bottom of the total work curve (bottom of the swoop)
How does obstructive disease change the the work curve?
- resistance work increases
- therefore breathe at high TV and low frequency
- this is consistent for bronchitis and asthma but not emphysema
What is dead space?
the volume of lung that does not exchange gas
what is anatomical dead space?
30% of lung volume because this is conducting airways that do not participate in gas exchange
What is alveolar dead space?
location of alveoli that normally participates in gas exchange but doesn’t anymore because of occluded vessel
