Background: The most important and complex phenomenon of respiratory function of the nose is related to different nasal anatomy. The differences in facial anatomic structure between different races may also be reflected in nasal resistance and airflow. Caucasians has different facial anatomic structure which is the reflection of intranasal resistance or consequence of airflow. The active anteri...

OBJECTIVE To explore aerodynamic, acoustic, and laryngeal changes surrounding opera performance. STUDY DESIGN Prospective preperformance, postperformance, and day after performance. METHODS The laryngeal and vocal function of five male and five female classically trained singers was assessed immediately before, immediately after, and 1 day after an actual operatic performance. Phonatory thr...

THE ASSOCIATION BETWEEN OBSTRUCTIVE SLEEP APNEA SYNDROME (OSAS), MAXILLOFACIAL MALFORMATIONS, AND MALOCCLUSIONS HAS ATTRACTED ATTENTION. Many patients with OSAS show craniofacial abnormalities involving both the jaws as well as skeletal structures of the respiratory dynamic space. These aberrations may be apparent very early in life. Nasal septal deviation is known to reduce airflow and increas...

THE ASSOCIATION BETWEEN OBSTRUCTIVE SLEEP APNEA SYNDROME (OSAS), MAXILLOFACIAL MALFORMATIONS, AND MALOCCLUSIONS HAS ATTRACTED ATTENTION. Many patients with OSAS show craniofacial abnormalities involving both the jaws as well as skeletal structures of the respiratory dynamic space. These aberrations may be apparent very early in life. Nasal septal deviation is known to reduce airflow and increas...

In this study, the optimal human respiratory control model proposed earlier was modified to include the nonlinear respiratory mechanics by replacing the resistance with a lumped viscous resistance of the flow through total respiratory system, and a resistance of flow which is proportional to the power of flow rate. To evaluate the effect of the nonlinear respiratory mechanics in the optimal res...

BACKGROUND Tracheostoma valves are used to make hand-free speaking possible for persons who have undergone a laryngectomy. OBJECTIVE To design and test a new tracheostoma valve to improve existing tracheostoma valves. METHODS The tracheostoma valve closes by means of strong inhalation so that all the air that is exhaled is available for phonation. The device automatically stays in the"speak...

Age appropriateness is a major concern of pulmonary delivery devices, in particular of dry powder inhalers (DPIs), since their performance strongly depends on the inspiratory flow manoeuvre of the patient. Previous research on the use of DPIs by children focused mostly on specific DPIs or single inspiratory parameters. In this study, we investigated the requirements for a paediatric DPI more br...

1. The role of syringeal muscles in song production, particularly in regulating airflow through the syrinx, was studied in singing brown thrashers (Toxostoma rufum). In nine individuals, muscle activity was recorded electromyographically together with bilateral syringeal airflow, subsyringeal air sac pressure, and vocal output. 2. Dorsal muscles, m. syringealis dorsalis (dS) and m. tracheolater...

OBJECTIVE To evaluate the effect of selective electrical stimulation of the tensor veli palatini muscle on upper airway patency. METHODS Pressure-flow relationships were evaluated, in a feline isolated upper airway preparation, to determine the role of the soft palate musculature on airflow dynamics. The tensor veli palatini muscles were selectively stimulated while monitoring upper airway co...

OBJECTIVE To analyze laryngeal aerodynamics in the same patient in 4 different circumstances: before the onset of unilateral vocal fold paralysis (UVFP), after the onset of UVFP, and after 2 types of surgical vocal fold medialization techniques to compare the results of surgery with the measurements made in that same patient when his larynx was healthy (before paralysis). DESIGN Prospective s...