Lung and chest wall Flashcards
Lung and chest wall - elastic recoil
tendency for lungs to collapse inward and chest wall to spring outward
Lung and chest wall - at FRC
inward pull of lung is balanced by outward pull of chest wall, and system pressure is atmospheric
Lung and chest wall - system pressure at FRC
atmospheric
Lung and chest wall - airway and alveolar pressure in FRC
0
Lung and chest wall - intrapleural pressure in FRC
negative
pulmonary vascular pressure at FRC
minimum
Lung and chest wall - compliance (definition and equation, it describes)
change in lung volume for a given change in pressure
expressed as ΔV/ΔP and is inversely proportional to wall stiffness
it describes the distensibility of the lung and ches wall
Lung and chest wall - decreased compliance situations
- pulmonary fibrosis
- pneumonia
- pulmonary edema
Lung and chest wall - increased compliance situations
- emphysema
2. normal age
purpose of negative intrapleural pressure during FRC
prevent pneumothorax
pulmonary vascular pressure is minimum at
FRC
Lung compliance is inversely proportional to
wall stiffness
high vs low compliance according to filling
high –> easy to fill
low –>hard to fill
substance that increases compliance
surfactant
Lung - hysteresis?
lung inflation (inspiration) curve follows a different curve than the lung deflation (expiration) curve due to need to overcome surface tension forces in inflation
