Asthma Chronic lung disease characterized by airway inflammation, airway and variable expiratory air flow obstruction There are 2 main critieria that are used to identify obstruction: • FEV1 / FVC of 0.70 or lower • FEV1 / FVC below the lower limit of normal (LLN) Severity is determined by reduction in FEV1%: • > 70% - mild • 50-69% - moderate • <50% - severe Reversibility on spirometry: • Increase of FEV1 or FVC of 12% or more, or • Increase of 200 mL or greater in FEV or FVC By @PulmPEEPs #Asthma #diagnosis #pulmonary
