25 yo F with HTN, carotid bruit, FH of stroke, and transient vision loss
Think FMD; diagnose with CT angio or duplex US
Inability to correct hypoxemia with increased FiO2
Intrapulmonary shunting; ie inadequate ventilation (eg pneumonia consolidation)
What does stratified analysis help with?
Distinguish between a variable that is a cofounder or an effect modifier