Peak inspiratory flow rate (PIFR) is the maximum amount of air that can be inhaled over the time course of 1 deep breath, measured in L/min. There is a direct correlation between the severity of a patient’s COPD, which includes chronic bronchitis and emphysema, and their age. The more severe the patient’s COPD and the older they are, the lower their PIFR.1,2
PIFR declines substantially with increasing age and disease severity1
Graph has been derived from a scatter plot and linear equation. From a trial of 53 COPD patients (35 mild, 17 moderate, 1 severe). GOLD guidelines recommend long-acting bronchodilators for moderate to very severe COPD.