Auscultation revisited: The waveform and spectral characteristics of breath sounds during general anesthesia

1997 ◽  
Vol 14 (4) ◽  
pp. 231-240 ◽  
Author(s):  
Gerard R. Manecke ◽  
James P. Dilger ◽  
Lisa J. Kutner ◽  
Paul J. Poppers
Keyword(s):  
General Anesthesia ◽  
Spectral Characteristics ◽  
Breath Sounds

scholarly journals Spectral characteristics of chest wall breath sounds in normal subjects.

Thorax ◽  
1995 ◽  
Vol 50 (12) ◽  
pp. 1292-1300 ◽  
Author(s):  
N Gavriely ◽  
M Nissan ◽  
A H Rubin ◽  
D W Cugell
Keyword(s):  
Chest Wall ◽  
Spectral Characteristics ◽  
Normal Subjects ◽  
Breath Sounds

Correlation of Breath Sounds with Diagnoses of Lung Dysfunction: Experimental Observations

1989 ◽  
Vol 203 (3) ◽  
pp. 151-158 ◽  
Author(s):  
S A T Stoneman ◽  
R Parker ◽  
A Jones
Keyword(s):  
Asthmatic Child ◽  
Spectral Characteristics ◽  
Spectral Analyses ◽  
Breath Sounds ◽  
Number Of Patients ◽  
Lung Dysfunction ◽  
Before And After

An investigation has been undertaken to determine whether there is any correlation between the spectral analyses of breath sounds at the mouth and the diagnosis of lung dysfunction in a small number of patients. The results of the investigation have shown that it is possible to differentiate between the spectral characteristics of the breath sounds of people who are: normal; asthmatic adult, both before and after the administration of a bronchodilator drug; asthmatic adult, treated with an inhaled steroid, both before and after the administration of a bronchodilator drug; asthmatic child, both before and after the administration of a bronchodilator drug. The possible applications of the technique are discussed.

scholarly journals Effect of methacholine induced bronchoconstriction on the spectral characteristics of breath sounds in asthma.

Thorax ◽  
1992 ◽  
Vol 47 (9) ◽  
pp. 680-683 ◽  
Author(s):  
D P Spence ◽  
S Bentley ◽  
D H Evans ◽  
M D Morgan
Keyword(s):  
Spectral Characteristics ◽  
Breath Sounds

Spectral characteristics of normal breath sounds

1981 ◽  
Vol 50 (2) ◽  
pp. 307-314 ◽  
Author(s):  
N. Gavriely ◽  
Y. Palti ◽  
G. Alroy
Keyword(s):  
Healthy Subjects ◽  
Spectral Characteristics ◽  
Left Lung ◽  
Power Spectra ◽  
Sharp Decrease ◽  
Frequency Domain Analysis ◽  
Breath Sounds ◽  
The Right ◽  
Interscapular Region

An objective and accurate measurement and characterization of breath sounds was carried out by a fast-Fourier-transform frequency-domain analysis. Normal vesicular breath sounds, picked up over the chest wall of 10 healthy subjects showed a characteristic pattern: the power of the signal decreased exponentially as frequency increased. Since the log amplitude vs. log frequency relationships were linear, they could be characterized by the values of the slope and the maximal frequency. The average slope of the power spectrum curves was found to be (in dB/oct +/- SD) 13.0 +/- 1.4 over the base of the right lung, 12.6 +/- 2.4 over the base of the left lung, 9.8 +/- 1.4 over the interscapular region, and 14.4 +/- 4.3 over the right anterior chest. The maximal frequencies of inspiratory and expiratory breath sounds, picked up over the base of the right lung, were (in Hz +/- SD) 446 +/- 143 and 286 +/- 53 (P less than 0.01), over the base of the left lung 475 +/- 115 and 284 +/- 47 (P less than 0.01), over the interscapular region 434 +/- 130 and 338 +/- 77 (P less than 0.05), and over the right anterior chest 604 +/- 302 and 406 +/- 205 (P less than 0.05). Breath sounds picked up over the trachea were characterized by power spectra typical to a broad spectrum sound with a sharp decrease of power at a cut-off frequency that varied between 850 and 1,600 Hz among the 10 healthy subjects studied.

Echocardiography in Saanen-goats: Normal findings, reference intervals in awake goats, and the effect of general anesthesia

2011 ◽  
Vol 153 (12) ◽  
pp. 553-564 ◽  
Author(s):  
K. Steininger ◽  
A.-S. J. Berli ◽  
R. Jud ◽  
C. C. Schwarzwald
Keyword(s):  
General Anesthesia ◽  
Reference Intervals
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