Peak nasal inspiratory flow measurement and visual analogue scale in a large adult population

Nasal obstruction is the most common symptom in nasal diseases. It can be evaluated objectively, i.e. by means of peak nasal inspiratory flow (PNIF) measures and/or subjectively by means of validated questionnaires. However, it has been reported that there is a lack of reliable correlation between subjective and objective measurements of nasal obstruction. The aim of the present study was to evaluate the correlation between PNIF measurements and the subjective sensation of nasal obstruction measured by means of a visual analogue scale (VAS) in a large population of consecutive rhinologic patients.