title: A fundamental study of rhinomanometry and its clinical application to objective evaluation.
abstract: We measured differential pressure and airflow at constant flow through a cylinder which had a variable aperture in its central portion, by means of a Rhinorheograph MPR-1100 in order to obtain a turbulent coefficient "n" experimentally in the equation R = delta P/Vn. Between of 1.0-5.0 cm H2O (not equal to 100-500 Pa) pressure, the coefficient "n" was distributed between 1.01-2.80 with a mean value of 2.02 (+/- 0.36), and resistances calculated from the equation R = delta P/Vn were almost the same value at each differential pressure. We applied this coefficient to 95 adult patients referred to our nasal airflow laboratory in Toronto, and found the equation R = delta P/V2 to be quite suitable for clinical assessment.
authors: Department of Otolaryngology, Fujita-Gakuen Health University School of Medicine, Aichi, Japan.
authors: K
authors: K
authors: Naito
authors: S
authors: S
authors: Iwata
authors: M
authors: M
authors: Kondo
authors: E
authors: E
authors: Ohoka
authors: P
authors: P
authors: Cole
mesh_terms: D000293:Adolescent; D000328:Adult; D000402:Airway Obstruction / Q000503:physiopathology*; D000403:Airway Resistance; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D008875:Middle Aged; D009666:Nose / Q000502:physiology*; D009668:Nose Diseases / Q000503:physiopathology*; D012123:Pulmonary Ventilation; D012044:Regression Analysis