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Case 55
Published in Simon Lloyd, Manohar Bance, Jayesh Doshi, ENT Medicine and Surgery, 2018
Simon Lloyd, Manohar Bance, Jayesh Doshi
Acoustic rhinometry: Acoustic rhinometry is a reliable means of measuring the volume of the nasal cavity. A probe is placed in the nostril and this generates an acoustic signal that is reflected from the nasal cavity to provide an assessment of cross-sectional area over distance. This is presented as an area-distance curve that normally has 3 notches representing the most narrow areas of the nasal cavity. The first two are the nasal valve and the front of the inferior turbinate. The third is variable. One of these represents the minimum cross-sectional area (MCA). The MCA in adults is usually between 1.3 and 1.5 cm2.
Measurement of the Nasal Airway
Published in John C Watkinson, Raymond W Clarke, Louise Jayne Clark, Adam J Donne, R James A England, Hisham M Mehanna, Gerald William McGarry, Sean Carrie, Basic Sciences Endocrine Surgery Rhinology, 2018
A major advantage of the technique of acoustic rhinometry is that it provides a measure of nasal cross sectional area and volume along the length of the nasal passage, unlike rhinomanometry that is limited to measuring the effects of the narrowest point of the nasal airway on nasal airflow. Technical specifications for standard operating procedures for acoustic rhinometry have been standardized as regards the accuracy and repeatability of measurements and the acquisition of data.22
Nasal Airway Measurement
Published in R James A England, Eamon Shamil, Rajeev Mathew, Manohar Bance, Pavol Surda, Jemy Jose, Omar Hilmi, Adam J Donne, Scott-Brown's Essential Otorhinolaryngology, 2022
Acoustic rhinometry consists of generating an acoustic pulse from a spark source or speaker, and the sound pulse is transmitted along a tube into the nose. The sound pulse is reflected back from inside the nose according to changes in the local acoustic impedance which are related to the cross-sectional area of the nasal cavity. The reflected sound is detected by a microphone, which transmits the sound signal to an amplifier and computer system for processing into an area distance graph.
Computational investigation of dust mite allergens in a realistic human nasal cavity
Published in Inhalation Toxicology, 2019
Ya Zhang, Yidan Shang, Kiao Inthavong, Zhenbo Tong, Bin Sun, Kang Zhu, Aibing Yu, Guoxi Zheng
In the past, conventional plastination of cadaver noses were used to study general characteristics of nasal airflow (Cheng et al. 1999). Such models however, were inaccurate due to shrinkage of mucous membranes or insertion of casting materials, and limited outcomes were shown in view of a patient-specific approach. Acoustic rhinometry is an effective, noninvasive test, for revealing the variation in cross-sectional area of the airways as a function of the distance from the nares. However, rhinomanometry is difficult to analyze details of the flow especially in crucial region of the inferior and middle meatus and only provides a general assessment depicted from a complex fluid dynamics pattern.
The effect of nasal septum deviation on voice aging
Published in Logopedics Phoniatrics Vocology, 2022
Ceren Ersoz Unlu, Ozlem Akkoca
Acoustic rhinometry measurements were performed to obtain objective data about the nasal cross-sectional area using Rhinometrics (Rhinoscan version 2.6, Interacoustics, Middelfart, Denmark) after the application of nasal decongestant (oxymetazoline). The nosepiece of the device was placed on each nostril in turn, and the patients were instructed to hold their breath during the measurement. In both groups, the average of three recordings of the minimal cross-section area at the level of the first 2 cm (MCA1) and at 2–5 cm (MCA2) of the narrower side of the nasal cavity were obtained.
Allergen immunotherapy against house dust mites in patients with local allergic rhinitis and asthma
Published in Journal of Asthma, 2022
Andrzej Bozek,, Beata Galuszka,, Radosław Gawlik,, Maciej Misiolek,, Wojciech Scierski,, Alicja Grzanka,, Giorgio Walter Canonica,
NPTs were performed using acoustic rhinometry with an A1 acoustic rhinometer (GM Instruments, Kilwinning, UK). These tests were performed according to the guidelines of the Standardization Committee on Acoustic Rhinometry and the EAACI position paper (15,16). All NPTs were performed in the morning under standardized room conditions, including previous exposition, acclimation time, room temperature (20–21 °C), and humidity (40–60%).