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Clinical Investigations: SLEEP |

Combined Effects of a Mechanical Nasal Dilator and a Topical Decongestant on Nasal Airflow Resistance*

Anne-Marie Lorino, PhD; Frédéric Lofaso, MD; Estelle Dahan; André Coste, MD; Alain Harf, MD; Hubert Lorino, PhD
Author and Funding Information

Affiliations: ,  *From INSERM U 492 et Service de Physiologie-Explorations Fonctionnelles, Hôpital Henri Mondor, AP-HP, Créteil, France.

Affiliations: ,  *From INSERM U 492 et Service de Physiologie-Explorations Fonctionnelles, Hôpital Henri Mondor, AP-HP, Créteil, France.



Chest. 1999;115(6):1514-1518. doi:10.1378/chest.115.6.1514
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The goal of this study was to compare the isolated and combined effects of two treatments being used to reduce nasal airflow resistance (NR): an internal nasal mechanical dilator (Nozovent; Prevancure; Sté Pouret, Paris, France) and a topical decongestant, fenoxazoline hydrochloride (Aturgyl; Synthelabo; Le Plessis-Robinson, France). The study was performed in 17 healthy subjects. NR was estimated by active posterior rhinometry at a 0.5 L/s flow under four conditions: in the basal state, with the internal nasal mechanical dilator, after treatment with fenoxazoline hydrochloride, and with both fenoxazoline hydrochloride and the mechanical dilator. The mean NR (± SD) decreased from 1.65 ± 0.54 cm H2O/L/s in the basal state to 1.02 ± 0.27 cm H2O/L/s with the mechanical dilator (p < 0.001), 1.03 ± 0.47 cm H2O/L/s with fenoxazoline hydrochloride (p < 0.001), and 0.48 ± 0.15 cm H2O/L/s with both the mechanical dilator and fenoxazoline hydrochloride (p < 0.001). The decreases in NR observed after using either the mechanical dilator (ΔNRn) or fenoxazoline hydrochloride (ΔNRa) were not significantly different. The decrease in NR observed with both (ΔNRn + a) was not significantly different from the sumΔ NRn + ΔNRa: 1.16 ± 0.53 cm H2O/L/s vs 1.25 ± 0.63 cm H2O/L/s, respectively (p > 0.05). ΔNRn + a strongly correlated with ΔNRn + ΔNRa:Δ NRn + a = 0.80 (ΔNRn + ΔNRa) + 0.15 (r = 0.96; p < 0.0001). However, the slope of the regression line ofΔ NRn + a vsΔ NRn + ΔNRa was significantly lower than unity (p < 0.003). These results demonstrate that, although not totally additive, the effects of using the mechanical dilator and fenoxazoline hydrochloride are cumulative. Further studies that include patients with nasal obstruction would allow us to better evaluate the benefit of a therapy combining both treatments.

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