Breathing, Obstruction, Restriction, and Gas Exchange. A Pulmonary Function Testing Interpretation Framework for Novice Learners

• related: PFT and lung functions
• tags: #literature

• 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

Links to this note

• PFT and lung functions
  • Breathing, Obstruction, Restriction, and Gas Exchange. A Pulmonary Function Testing Interpretation Framework for Novice Learners
• simple vs complex restriction on PFT
  • [^1]: Breathing, Obstruction, Restriction, and Gas Exchange. A Pulmonary Function Testing Interpretation Framework for Novice Learners