scholarly journals Sleep/Wakefulness Detection Using Tracheal Sounds and Movements

2020 ◽  
Vol Volume 12 ◽  
pp. 1009-1021
Author(s):  
Nasim Montazeri Ghahjaverestan ◽  
Sina Akbarian ◽  
Maziar Hafezi ◽  
Shumit Saha ◽  
Kaiyin Zhu ◽  
...  
Keyword(s):  
Tracheal Sounds

Detection of nocturnal wheezing in bronchial asthma using intermittent sleep tracheal sounds recording

Respirology ◽  
1999 ◽  
Vol 4 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Hiroshi Kiyokawa ◽  
Makoto Yonemaru ◽  
Shinobu Horie ◽  
Ikuma Kasuga ◽  
Yuichi Ichinose ◽  
...  
Keyword(s):  
Bronchial Asthma ◽  
Tracheal Sounds

Changes in tracheal sounds in subjects with unilateral vocal cord paralysis

1998 ◽  
Vol 18 (3) ◽  
pp. 263-264
Author(s):  
Saarinen ◽  
Rihkanen ◽  
Malmberg ◽  
Sovijärvi
Keyword(s):  
Vocal Cord ◽  
Vocal Cord Paralysis ◽  
Tracheal Sounds ◽  
Unilateral Vocal Cord Paralysis

Phonospirometry for noninvasive measurement of ventilation: methodology and preliminary results

2002 ◽  
Vol 93 (4) ◽  
pp. 1515-1526 ◽  
Author(s):  
Cheng-Li Que ◽  
Christof Kolmaga ◽  
Louis-Gilles Durand ◽  
Suzanne M. Kelly ◽  
Peter T. Macklem
Keyword(s):  
Airway Obstruction ◽  
Tidal Volume ◽  
Minute Ventilation ◽  
Respiratory Frequency ◽  
Flow Volume ◽  
Quiet Breathing ◽  
Neck Extension ◽  
Volume Relationship ◽  
Tracheal Sounds ◽  
Nose Clip

We measured tracheal flow from tracheal sounds to estimate tidal volume, minute ventilation (V˙i), respiratory frequency, mean inspiratory flow (Vt/Ti), and duty cycle (Ti/Ttot). In 11 normal subjects, 3 patients with unstable airway obstruction, and 3 stable asthmatic patients, we measured tracheal sounds and flow twice: first to derive flow-sound relationships and second to obtain flow-volume relationships from the sound signal. The flow-volume relationship was compared with pneumotach-derived volume. When subjects were seated, facing forward and with neck rotation, flexion, and standing, flow-volume relationship was within 15% of pneumotach-derived volume. Error increased with neck extension and while supine. We then measured ventilation without mouthpiece or nose clip from tracheal sounds during quiet breathing for up to 30 min. Normal results ± SD revealed tidal volume = 0.37 ± 0.065 liter, respiratory frequency = 19.3 ± 3.5 breaths/min, V˙i = 6.9 ± 1.2 l/min, Vt/Ti = 0.31 ± 0.06 l/s, and Ti/Ttot = 0.37 ± 0.04. Unstable airway obstruction had large V˙i due to increased Vt/Ti. With the exception of Ti/Ttot, variations in ventilatory parameters were closer to log normal than normal distributions and tended to be greater in patients. We conclude that phonospirometry measures ventilation reasonably accurately without mouthpiece, nose clip, or rigid postural constraints.

scholarly journals Tracheal Sounds Acquisition Using Smartphones

Sensors ◽  
2014 ◽  
Vol 14 (8) ◽  
pp. 13830-13850 ◽  
Author(s):  
Bersain Reyes ◽  
Natasa Reljin ◽  
Ki Chon
Keyword(s):  
Tracheal Sounds

scholarly journals Using the Entropy of Tracheal Sounds to Detect Apnea during Sedation in Healthy Nonobese Volunteers

2013 ◽  
Vol 118 (6) ◽  
pp. 1341-1349 ◽  
Author(s):  
Lu Yu ◽  
Chien-Kun Ting ◽  
Bryce E. Hill ◽  
Joseph A. Orr ◽  
Lara M. Brewer ◽  
...  
Keyword(s):  
Flow Rate ◽  
Secondary Analysis ◽  
Acoustic Method ◽  
Central Apnea ◽  
Robust Method ◽  
Normal Breathing ◽  
Respiratory Flow ◽  
Tracheal Sound ◽  
Tracheal Sounds ◽  
Estimate Flow

Abstract Background: Undetected apnea can lead to severe hypoxia, bradycardia, and cardiac arrest. Tracheal sounds entropy has been proved to be a robust method for estimating respiratory flow, thus maybe a more reliable way to detect obstructive and central apnea during sedation. Methods: A secondary analysis of a previous pharmacodynamics study was conducted. Twenty volunteers received propofol and remifentinal until they became unresponsive to the insertion of a bougie into the esophagus. Respiratory flow rate and tracheal sounds were recorded using a pneumotachometer and a microphone. The logarithm of the tracheal sound Shannon entropy (Log-E) was calculated to estimate flow rate. An adaptive Log-E threshold was used to distinguish between the presence of normal breath and apnea. Apnea detected from tracheal sounds was compared to the apnea detected from respiratory flow rate. Results: The volunteers stopped breathing for 15 s or longer (apnea) 322 times during the 12.9-h study. Apnea was correctly detected 310 times from both the tracheal sounds and the respiratory flow. Periods of apnea were not detected by the tracheal sounds 12 times. The absence of tracheal sounds was falsely detected as apnea 89 times. Normal breathing was detected correctly 1,196 times. The acoustic method detected obstructive and central apnea in sedated volunteers with 95% sensitivity and 92% specificity. Conclusions: We found that the entropy of the acoustic signal from a microphone placed over the trachea may reliably provide an early warning of the onset of obstructive and central apnea in volunteers under sedation.

Apnoea characterisation using tracheal sounds spectral analysis

2017 ◽  
Author(s):  
AbdelKebir SABIL ◽  
Guillaume Baffet ◽  
Cédric Freycenon ◽  
Jean Pinguet
Keyword(s):  
Spectral Analysis ◽  
Tracheal Sounds

Relationship between Forced Expiratory Flow and Tracheal Sounds

Respiration ◽  
1988 ◽  
Vol 54 (2) ◽  
pp. 78-88 ◽  
Author(s):  
Masashi Mori ◽  
Mariko Ono ◽  
Tetsuya Hisada ◽  
Hiroyoshi Kino ◽  
Mari Iguchi ◽  
...  
Keyword(s):  
Forced Expiratory Flow ◽  
Tracheal Sounds ◽  
Expiratory Flow
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