Habitual snoring in adults may be related to upper airway dysfunction, although the precise relationship has never been studied. We quantitatively measured snoring and correlated it with upper airway properties in 50 apneic and 59 nonapneic adult male patients. Both groups were similar in terms of nasal airflow resistance and pulmonary function tests. We found a significant correlation between ...

To study the airflow distribution in human nasal cavity during respiration and the characteristic parameters for nasal structure, thirty three-dimensional, anatomically accurate representations of adult nasal cavity models were reconstructed based on processed tomography images collected from normal people. The airflow fields in nasal cavities were simulated using the fluid dynamics with the fi...

This study reports a new integrated device for measuring oral and nasal airflow with lossless speech recording with preliminary results on Chinese plosives. An acoustically transparent fiber-made mask acts both as a material for airflow resistance and a support for partitioning oral and nasal chambers. Two pressure sensors placed directly on the mask measure air pressure signals that correspond...

PURPOSE Seizure related unconscious face-down positioning could contribute to sudden unexpected death in epilepsy via asphyxia. Low airflow resistance lattice foam pillows have been advocated for this group. However, data to support this approach remain lacking, and low airflow resistance per se may not negate asphyxia risk from expired gas rebreathing. This study was designed to compare the ai...

The effect of device geometry and film characteristics on the performance of several passive flutter-induced dispersion DPI prototypes was investigated. Device resistance measurements indicated that the type of films, type of device geometry and specific device dimensions significantly affects the airflow resistance of the device. It was found that airflow resistance was positively correlated t...

The purpose of this paper is to apply MEMS techniques to manufacture a gas flow sensor that consists with an airflow rate and airflow direction sensing units for detection of airflow states. This study uses a silicon wafer as a substrate which is deposited silicon nitride layers. To form the airflow rate sensing unit, a micro heater and a sensing resistor are manufactured over a membrane that r...

The bronchoconstrictor response to exercise was measured in 29 healthy children and in 23 children with recurrent wheezing attacks, using the Wright low-range peak flow meter and a modification of the forced oscillation technique. None of the healthy children showed significant change in airflow obstruction after a 6-minute run, whereas 20 of the 23 wheezy children showed a mean rise in total r...

OBJECTIVE The objective of this study was to investigate the effects of miniscrew-assisted rapid palatal expansion (MARPE) on changes in airflow in the upper airway (UA) of an adult patient with obstructive sleep apnea syndrome (OSAS) using computational fluid-structure interaction analysis. METHODS Three-dimensional UA models fabricated from cone beam computed tomography images obtained befo...