Effects of different mechanical treatments on nasal resistance assessed by rhinometry.

The goal of this study was to compare the effectiveness of three treatments aiming to reduce nasal airflow resistance (NR): an external nasal strip device (Respir+), an internal nasal mechanical dilator (Nozovent), and a topical decongestant (Pernazene). NR was estimated by active posterior rhinometry at both a 0.5 L/s flow (NRF) and a 1 cm H 2 O pressure (NRp), under four conditions: in the basal state, with Respir+, with Nozovent, and after treatment with Pernazene. The efficacy of each treatment was assessed by the percentage changes in NRF and NRP (%NRF and %NRP, respectively). The study was performed in 15 healthy subjects. The efficacy of the treatments was significantly different, depending on whether it was evaluated by NRF or by NRP (p