Breathing, Obstruction, Restriction, and Gas Exchange. A Pulmonary Function Testing Interpretation Framework for Novice Learners
- related: PFT and lung functions
- tags: #literature #pulmonology
- BORG modules
- breathing
- obstruction
- restriction
- gas exchange
- breathing
- lung volumes and capacities
- obstruction
- definition of obstructiong by FEV/FVC ratio
- RV > 120 = air trapping
- TLC > 120 = hyperinflation
- restriction
- TLC < 80% pred = restriction
- different lung disease based on pattern of restriction
- DPLD: Diffuse Parenchymal Lung Disease
- gas exchange
- fibrosis: increased alveolar-capillary membrane (ACM) causing decreased exchange
- COPD: decreased surface area of ACM causing decreased DLCO
- asthma: increased venous return, capillary blood volume = increased surface area
- Q&A
- NMD: early = inspiratory muscles affected = lower TLC. Late = expiratory muscle affected
- obesity: ERV much much lower because of increased abdomen content
- asthma: decrease in pleural pressure = increased blood pull = more exchange