Nasal airflow: resistance and sensation

1989 ◽  
Vol 103 (10) ◽  
pp. 909-911 ◽  
Author(s):  
A. S. Jones ◽  
D. J. Willatt ◽  
L. M. Durham
Keyword(s):  
Objective Measure ◽  
Nasal Resistance ◽  
Nasal Airflow ◽  
Nasal Patency ◽  
Airflow Resistance ◽  
Large Numbers ◽  
Two Parameters

AbstractFor 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 (objective) nasal resistance to airflow and (subjective) nasal sensation of airflow where carried out.No correlation could be demonstrated between these two parameters.It is concluded nasal resistance to airflow and nasal sensation of airflow are two separate modalities which are not directly related. The possible reasons for this finding are discussed with reference to previous work on nasal sensation.

Obstruction of the nasal valve

1996 ◽  
Vol 110 (3) ◽  
pp. 221-224 ◽  
Author(s):  
Samy Elwany ◽  
Hossam Thabet
Keyword(s):  
Surgical Procedures ◽  
Lateral Cartilage ◽  
Nasal Resistance ◽  
Nasal Airflow ◽  
Nasal Patency ◽  
Nasal Valve ◽  
Nasal Surgery ◽  
History Of ◽  
Upper Lateral Cartilage ◽  
The Mean

AbstractObstruction of the nasal valve is an important cause of chronic nasal obstruction in adults. In a series of 500 patients, obstruction at the level of the nasal valve was diagnosed in 65 of them (13 per cent). The obstruction was unilateral in 57 patients (88 per cent). Forty-seven patients (72 per cent) had history of previous nasal surgery of accidental trauma. Causes of obstruction of the nasal valve included high septal deviations, a weak or deformed upper lateral cartilage, adhesions, and alar collapse. All patients underwent corrective nasal surgery and the surgical procedures were tailored according to the existing pathology. Post-operatively, the mean nasal patency score increased from 2.9 to 8.6, the mean nasal airflow increased from 579.5 to 727 cm/sec (at 150 Pa), and the mean nasal resistance decreased from 0.31 to 0.23 Pa/cm3sec-1.

Exercise and nasal patency

1983 ◽  
Vol 55 (3) ◽  
pp. 860-865 ◽  
Author(s):  
R. D. Forsyth ◽  
P. Cole ◽  
R. J. Shephard
Keyword(s):  
Short Duration ◽  
Healthy Subjects ◽  
Time Course ◽  
Nasal Resistance ◽  
Exercise Recovery ◽  
Nasal Airflow ◽  
Nasal Patency ◽  
Progressive Decrease ◽  
Sudden Decrease

Nasal airflow resistances were studied in 20 healthy subjects at rest, with exercise, and during recovery from exercise. Resistances were first measured under resting conditions. As a basis for comparison 0.1% xylometazoline was applied by insufflation; it reduced nasal resistance by an average of 49%. On a subsequent occasion, the degree and time course of changes in resistance were measured 1) during 5-min exercise bouts at rest 25, 50, and 75% of predicted maximum O2 intake (VO2max), 2) during 5-, 10-, and 15-min exercise bouts at 50% of VO2max, and 3) during recovery from exercise. Resistance decreased with intensity but not duration of exercise; an initial sudden decrease was followed by a more gradual but progressive decrease, which continued for several minutes following vigorous short duration exercise. Thus following 5 min of effort at 75% of VO2max, resistance reached a nadir (46% fall) 5 min after cessation of exercise. Recovery of preexercise values required 5 min after 5 min of exercise at 25% of VO2max and 10 min after 5 min of exercise at 50% of VO2max. Some decrease persisted 15 min after 5 min of exercise at 75% of VO2max.

Nasal Patency and Its Assessment

1987 ◽  
Vol 1 (3) ◽  
pp. 135-139 ◽  
Author(s):  
Philip Cole
Keyword(s):  
Nasal Airflow ◽  
Nasal Patency ◽  
Clinical Value ◽  
Airflow Resistance

The propagation of nasal airflow resistance and its indispensable role in the modification of inspiratory air is described. Aerodynamic features and principles of rhinomanometric techniques which are commonly involved in the assessment of nasal patency are outlined. The clinical value of rhinomanometry is discussed in the light of the Toronto experience with several thousand patients.

Continuous assessment of nasal airflow resistance by adaptive modeling

2009 ◽  
Vol 30 (11) ◽  
pp. 1197-1209 ◽  
Author(s):  
T Seppänen ◽  
M Koskinen ◽  
T M Seppänen ◽  
O-P Alho
Keyword(s):  
Nasal Airflow ◽  
Continuous Assessment ◽  
Adaptive Modeling ◽  
Airflow Resistance

scholarly journals Primary school children often underestimate their nasal obstruction

2016 ◽  
Vol 54 (2) ◽  
pp. 164-169
Author(s):  
Francesca Occasi ◽  
Marzia Duse ◽  
Tommaso Vittori ◽  
Anna Rugiano ◽  
Giancarlo Tancredi ◽  
...  
Keyword(s):  
Allergic Rhinitis ◽  
Secondary School ◽  
Primary School ◽  
Nasal Obstruction ◽  
School Children ◽  
Primary School Children ◽  
Nasal Resistance ◽  
Nasal Patency ◽  
School Aged Children ◽  
Subjective Sensation

Background: No consensus has ever been reached about the correlation between nasal resistance and the subjective sensation of nasal patency. The aim of the present study was to better de ne whether primary school and secondary school aged children correctly estimate their nasal obstruction. Materials and methods: Two hundred eighty four children (168 males and 116 female) aged between 6 and 14 years (9.5+2.9 years) affected by Pediatric Allergic Rhinitis underwent Rhinomanometry and they were considered as correctly estimating their nasal obstruction when the grade of nasal patency corresponded to the severity of the NOSE score, overestimating when the grade of nasal patency was <1 when compared to the severity of the score, underestimating when the grade of nasal patency was >1 when compared to the severity of the score. Results: Correlation between NOSE score and nasal patency was statistically significant (r -0.74; p<0.001). Children between 6 and 9 years of age underestimate (43.7%) and children >12 overestimate (34.7%) their symptoms more frequently than children among other age ranges (p<0.001). Conclusion: Although NOSE score approximately allow to quantify nasal obstruction, in children, especially between 6 and 9 years of age, an objective measurement of nasal patency should be performed to better define the therapeutic approach.

Rhinomanometry Versus Computational Fluid Dynamics: Correlated, but Different Techniques

2020 ◽  
pp. 194589242095015
Author(s):  
Giancarlo B. Cherobin ◽  
Richard L. Voegels ◽  
Fábio R. Pinna ◽  
Eloisa M. M. S. Gebrim ◽  
Ryan S. Bailey ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Nasal Resistance ◽  
Nasal Patency ◽  
Low Correlation ◽  
Before And After ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Experiments

Background Past studies reported a low correlation between rhinomanometry and computational fluid dynamics (CFD), but the source of the discrepancy was unclear. Low correlation or lack of correlation has also been reported between subjective and objective measures of nasal patency. Objective: This study investigates (1) the correlation and agreement between nasal resistance derived from CFD (RCFD) and rhinomanometry (RRMN), and (2) the correlation between objective and subjective measures of nasal patency. Methods Twenty-five patients with nasal obstruction underwent anterior rhinomanometry before and after mucosal decongestion with oxymetazoline. Subjective nasal patency was assessed with a 0-10 visual analog scale (VAS). CFD simulations were performed based on computed tomography scans obtained after mucosal decongestion. To validate the CFD methods, nasal resistance was measured in vitro (REXPERIMENT) by performing pressure-flow experiments in anatomically accurate plastic nasal replicas from 6 individuals. Results Mucosal decongestion was associated with a reduction in bilateral nasal resistance (0.34 ± 0.23 Pa.s/ml to 0.19 ± 0.24 Pa.s/ml, p = 0.003) and improved sensation of nasal airflow (bilateral VAS decreased from 5.2 ± 1.9 to 2.6 ± 1.9, p < 0.001). A statistically significant correlation was found between VAS in the most obstructed cavity and unilateral airflow before and after mucosal decongestion (r = −0.42, p = 0.003). Excellent correlation was found between RCFD and REXPERIMENT (r = 0.96, p < 0.001) with good agreement between the numerical and in vitro values (RCFD/REXPERIMENT = 0.93 ± 0.08). A weak correlation was found between RCFD and RRMN (r = 0.41, p = 0.003) with CFD underpredicting nasal resistance derived from rhinomanometry (RCFD/RRMN = 0.65 ± 0.63). A stronger correlation was found when unilateral airflow at a pressure drop of 75 Pa was used to compare CFD with rhinomanometry (r = 0.76, p < 0.001). Conclusion CFD and rhinomanometry are moderately correlated, but CFD underpredicts nasal resistance measured in vivo due in part to the assumption of rigid nasal walls. Our results confirm previous reports that subjective nasal patency correlates better with unilateral than with bilateral measurements and in the context of an intervention.

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