Figure 3From: Investigating the relationship between peak inspiratory flow rate and volume of inhalation from a Diskus™ Inhaler and baseline spirometric parameters: a cross-sectional studyScatterplot of Diskus™ PIFR versus spirometric PIFR showing line of best fit. Dashed lines represent Diskus PIFR of 30 L/min (minimum required) and 60 L/min (optimal PIFR for drug delivery). Patients with a Diskus PIFR less than 30 L/min are unsuitable for this dry powder inhaler.Back to article page