Flashcards in MechANISM RestIng CondItIOns Deck (15)
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1
normal lung mean intrapleural pressure before inspiration
-5 cm H2O
- FRC
2
recoil force
= +5
3
alveolar pressure
= 0 atm pressure
4
during inspiration
- diaphragm will pull the lung downwards
- causing an increase in thoracic volume causing decrease in the pressure in the thorax causing
5
the more the negative the intrapleural pressure
- the more it expands the lung
6
dynamic state
- no expansion
- no collapse
- lung is inflated
- alveolar pressure
- flow stops
7
pressure is inverse to
- volume
8
greatest airflow into the alveolus
- mid inspiration
- greatest pressure gradient
9
alveolar pressure 0--> (-1 ) -->0 at the end of inspiration any pathology that decreases the ability to develop negative alveolar pressure can be referred to
- RESTRICTIVE DISEASE
- lost of ability to develop negative alveolar pressure
- no gradient , no flow
eg. fibrosis, asbestosis, siliconosis, sarcoidosis (OSIS to restrict)
10
at the end of deep inspiration
- alveolar pressure 0 zero
11
patient with PULMONARY FIBROSIS
- lose the ability to develop negative alveolar pressure
12
expiration
- relax diaphragm
- lose volume
- pressure increase
- intrapleural pressure from -8 to -5
- recoil force collapse of the lung form 0 pressure to +1
reason for air leaving the alveolus
13
any pathology that decrease the ability to develop positivity pressure
- obstructive disease
- e.g. EMPHYSEMA classic, asthma, chronic bronchitis, COPD
- BARREL LUNGS
14
during inspiration intrapleural pressure
- becomes more negative
- form -5 to -8cm H2O
15
