Rhinomanometrische Messungen unter schrittweiser körperlicher Belastung an Probanden mit normaler Nasenatmung

Lenz, H; Wegener, Ulrich; Eichler, J

doi:10.1055/s-2007-1008243

Cited by 2 publications

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“…flow turbulence, directional variations, tortuosity). Different methods have been proposed to calculate the nasal resistance, 3–6 particularly during laminar flow. The pressure difference can be determined using the Fanning equation which estimates the flow resistance encountered in a fluid flowing in a tube in the presence of stenoses, section widening, flow direction variations, and that is a function of:…”

Section: Introductionmentioning

confidence: 99%

Study and application of a mathematical model for the provisional assessment of areas and nasal resistance, obtained using acoustic rhinometry and active anterior rhinomanometry

et al. 2001

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Nasal resistance (NR) depends on the geometrical features and tortuosity of the nasal airway and on the air flow. Knowing the longitudinal distribution of cross-sectional areas (CSAs) in the nasal cavity (which can be obtained using acoustic rhinometry) and the laminar nasal resistance (obtainable by processing the rhinomanometric results), it is possible to calculate, utilizing a mathematical model elaborated on the basis of fluid dynamics, the differential nasal resistance (NRdiff) and the cumulative nasal resistance (NRcum), thus localizing the position at which the highest resistance is concentrated and the related longitudinal distribution. Using a mathematical model, we integrated the sigmoid curves DeltaP/Q of rhinomanometry with the cross-sectional areas obtained using acoustic rhinometry, thus obtaining the normal distribution of differential and cumulative nasal resistances. Afterwards, we empirically reduced the cross-sectional areas corresponding to the head, body, tail and the whole inferior turbinate, recalculating the differential and cumulative nasal resistance distribution curves. The results show that reduction of up to 50% of cross-sectional areas does not substantially affect the resistivity role of the nasal valve, while greater reductions move the highest resistivity point to an area at the junction of the body and the head of the inferior turbinate. The study of the differential nasal resistance trend curves as a function of the reduction of cross-sectional areas shows that the resistance variation of the body and the whole inferior turbinate prevail with reductions of up to 40%, while the variation of cross-sectional areas of the body bordering the inferior turbinate head is predominant with higher reductions. The cross-sectional areas of the nasal airway cavity with highest resistivity are mainly located in an anterior position, where the differential nasal resistances are higher, but there are substantial variations produced by reducing the cross-sectional area of the posterior nasal airway. A similar model can produce provisional values for the results obtainable with functional nasal surgery.

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Section: Introductionmentioning

confidence: 99%

Study and application of a mathematical model for the provisional assessment of areas and nasal resistance, obtained using acoustic rhinometry and active anterior rhinomanometry

et al. 2001

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“…Diese Beobachtung steht im Gegensatz zu dem in der Literatur beschriebenen Rückgang zum Ruhewert nach selbigem Zeitablauf [5,13,17,19]. Messung nach 30 min Pause.…”

Section: Introductionunclassified

“…Unter körperlicher Belastung wird der Nasenwiderstand geringer [1,3,4,7,13,15,17]. Unter lokal wirkender extrem hoher Umgebungstemperatur (finnische Trokkensauna) sowie nach der vom Organismus selbst erzeugten Wärme (Fahrradergometertraining) sollte jeweils die Nasenventilation bestimmt werden.…”

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Rhinomanometrische Untersuchungen zur thermischen Beeinflussung der Nasenventilation

Schwarz

1998

HNO

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Elevation of nasal resistance has been described as an effect of increased air temperature by different authors. The aim of this study was to evaluate the effect of high environmental temperature on congestion of the nasal mucosa. In all, 102 volunteers were studied and included normal controls, heart rehabilitation patients and high performance sportsmen. Rhinomanometric examinations were carried out before and after 10 min in a dry Finnish sauna at a 90 degrees C temperature. Computerized active anterior rhinomanometry was used. A uniform response pattern to the increased temperature could not be observed: i.e., some individuals had an elevated resistance immediately after the sauna while resistance was decreased in others. The relationship between the reaction of the nasal mucosa to body work and temperature is discussed.

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Rhinomanometrische Messungen unter schrittweiser körperlicher Belastung an Probanden mit normaler Nasenatmung

Abstract: Bisher liegen nur wenige wissenschaftliche Ergebnisse bezuglich der Veranderung des nasalen Widerstandes oder anderer rhinomanometrischer Kenngro&n wie V15 (= Volumenstrom bei 15 mm H20 = 150 Pa) unter verschiedener korperlicher Belastung vor (

Cited by 2 publications

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Study and application of a mathematical model for the provisional assessment of areas and nasal resistance, obtained using acoustic rhinometry and active anterior rhinomanometry

Study and application of a mathematical model for the provisional assessment of areas and nasal resistance, obtained using acoustic rhinometry and active anterior rhinomanometry

Rhinomanometrische Untersuchungen zur thermischen Beeinflussung der Nasenventilation

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