Results 251 to 260 of about 2,419,788 (292)
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Nasal Resistance and Nasal Valve Area
American Journal of Rhinology, 1995The nasal valve is considered to be the primary flow-limiting segment of the normal upper airway. We examined subjects with and without nasal pathology to determine whether nasal airway resistance, as determined by rhinomanometry, could be related to clinically measurable geometrical characteristics of the nasal valve.
Saul Frenkiel +2 more
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Measurement of nasal airway resistance
Journal of Allergy, 1965Abstract A measure of nasal airway resistance can be obtained by simultaneously relating transnasal pressure drop and the rate of nasal air flow. Resistance varies continuously throughout the range of attainable flows, and it has meaning only in relationship to specified rates of flow at which it is measured. The procedure described appears to provide
W R, SOLOMON +4 more
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Dynamic Changes of Nasal Resistance
Annals of Otology, Rhinology & Laryngology, 1979Fifty human subjects were studied and evaluated utilizing posterior rhinomanometry techniques. The main purpose of the investigation was to study the physiologic dynamic range of nasal resistance so that the data might serve as a baseline, not only for evaluation and diagnosis of pathologic states but also for the assessment of nasal responses to ...
M, Hasegawa, E B, Kern, P C, O'Brien
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The nasal resistance of newborn infants
The Journal of Pediatrics, 1965The resistance of the nasal air passages, which is an important factor in the mechanics of respiration in newborn infants, was found to be about one fourth of the total lung resistance. It would appear that the nasal passages contribute a relatively smaller part (slightly less than half) of the airway resistance than in adults.
G, Polgar, G P, Kong
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Reciprocating Nasal Airflow Resistances
Acta Oto-Laryngologica, 1984Reciprocal changes in airflow resistance between nasal cavities are induced by lateral recumbency, and also by unilateral pressures to body surfaces in postures which avoid hydrostatic differences between sides. The reciprocating spontaneous nasal cycle in erect subjects and these nasal responses to lateral posture and pressure maintain total nasal ...
J J, Haight, P, Cole
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Nasal surgery and airway resistance
The Laryngoscope, 1979AbstractThis study investigates the effects of surgery and bronchodilatation on nasal and pulmonary resistance. The plethysmograph is evaluated as a clinical tool for nasal flow studies. The method of adapting the plethysmograph to measure nasal resistance is presented.Discriminant Function Analysis considers the effects of surgery and ...
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Nasal airflow: resistance and sensation
The Journal of Laryngology & Otology, 1989AbstractFor many years nasal resistance to airflow measured by rhinomanometry has been regarded as the objective measure of nasal patency. However, recently it has become apparent that this may not be the case.The present study was designed to affirm or refute this view by using large numbers of subjects and observations.Five hundred estimations of ...
A S, Jones, D J, Willatt, L M, Durham
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Nasal Airway Resistance Computer
The Laryngoscope, 1977An analogue computing system for the measurement of nasal airway resistance (Rn) has been developed. The instrument operates on the principle of measuring the transnasal pressure required to generate a measured nasal airflow rate. The system computes and displays inspiratory or expiratory nasal airway resistance measured at a preselected flow rate. The
L H, Hamilton, N T, Christman
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Nasal Cycle and Postural Variations in Nasal Resistance
Annals of Otology, Rhinology & Laryngology, 1982The relationship between the nasal cycle and postural variations in unilateral nasal resistance (UNR) was observed in ten normal subjects. During the nasal cycle, postural variations in UNR were notable in congested nasal chambers; UNR at 0° from a horizontal plane was found to be higher than at greater angles. Postural variations in UNR in constricted
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Cyclical Changes in Nasal Resistance
Archives of Otolaryngology - Head and Neck Surgery, 1970AT ANY given instant, most individuals have a unilateral nasal obstruction. This obstruction is a normal physiological phenomenon due to turbinate engorgement. The obstruction changes in a cyclical manner from side to side throughout the day and night and yet the individual is usually unaware of this occurrence. So complete is the unilateral occlusion,
J J, Principato, J M, Ozenberger
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