It is not known whether nasal occlusion produces obstructive sleep apnea (OSA) by decreasing upper airway muscle activation via nasal reflexes or by increasing upper airway resistance and hence lowering the pressure in the pharnyx. The purpose of this study was to determine the effect of nasal occlusion on upper airway muscle activation. We studied seven men and measured alae nasi (AN) and geni...

Two studies were carried out to test the hypothesis that the fall and recovery of nasal resistance after exercise in asthmatic and non-asthmatic subjects are related to the development of bronchoconstriction after exercise. In study 1 nasal resistance (posterior rhinomanometry) and specific airway resistance (sRaw) were measured before challenge and one, five, 10 and 30 minutes after four minut...

BACKGROUND In infants the impedance of the nasal pathways (Zn) is a significant proportion of the total respiratory impedance (Zrs). METHODS In 11 infants Zrs was partitioned into Zn and lower respiratory system impedance (Zlrs) using a nasal catheter. A low frequency oscillatory signal (0.5-20 Hz) was applied during a pause in breathing to obtain the impedance spectra. A model of the respira...

The study evaluated the effects of obturators on respiratory function by analyzing the changes in nasal anatomic structures and physiologic function in maxillectomy patients with and without obturators. Twenty-six patients who underwent maxillectomy were chosen and rehabilitated with obturators by a single maxillofacial prosthodontist. The geometric shape of the nasal cavity, the nasal airway r...

BACKGROUND Patients with obstructive sleep apnoea (OSA) have a number of upper airway structural abnormalities which may influence the resistance of the oral airway to airflow. There have been no systematic studies of the flow dynamics of the oral cavity in such patients. METHODS Inspiratory oral airway resistance to airflow (RO) was measured in 13 awake patients with OSA in both the upright ...

OBJECTIVE To evaluate whether virtual surgery performed on 3-dimensional (3D) nasal airway models can predict postsurgical, biophysical parameters obtained by computational fluid dynamics (CFD). METHODS Presurgery and postsurgery computed tomographic scans of a patient undergoing septoplasty and right inferior turbinate reduction (ITR) were used to generate 3D models of the nasal airway. Prio...

Local Allergic Rhinitis (LAR) is an emerging disease. However, its incidence in the pediatric population has not yet been studied. The gold-standard for the diagnosis is the nasal provocation test that is not everywhere available and difficult to apply in children. The aim of our study is to evaluate the nasal lavage fluid IgE as a biomarker of LAR in children. 54 pediatric patients [IQR 4.0-12...