Explain the pathophysiological chain of events that leads to…

Explain the pathophysiological chain of events that leads to barrel chest deformity in a patient with COPD. Think about: *What muscles are being overused/under utilized? *What is happening to the full lung volume, is all the air going in or out? If not what is happening to the lung space? Why is the chest getting “shorter” and expanding outwards  

A COPD patient’s SpO₂ drops to 86% during a treadmill walkin…

A COPD patient’s SpO₂ drops to 86% during a treadmill walking session. What is the most appropriate response? There are many ways you can answer this, we discussed conservative options, and options when your patient is a stubborn old lady who is going to yell at you if you stop her treadmill but you need to be safe while making her think she is charge (how I imagine myself acting to the poor young interns while I am in cardiac/pulmonary rehab in 50 years). Can you add* anything to the exercise as well?