Pneumothorax detection using computerised analysis of breath sounds

  title={Pneumothorax detection using computerised analysis of breath sounds},
  author={Hussein Mansy and Thomas J. Royston and Robert A. Balk and Richard Sandler},
  journal={Medical and Biological Engineering and Computing},
The primary objective of the study was to investigate the effects of pneumothorax (PTX) on breath sounds and to evaluate their use for PTX diagnosis. The underlying hypothesis is that there are diagnostic breath sound changes with PTX. An animal model was created in which breath sounds of eight mongrel dogs were acquired and analysed for both normal and PTX states. The results suggested that pneumothorax was associated with a reduction in sound amplitude, a preferential decrease in high… Expand
Detection of Pneumothorax Visualized by Computer Analysis of Bilateral Respiratory Sounds
A device which analyzes and converts the frequency of auscultatory sounds to numerical values with a computer to facilitate the detection of occult pneumothorax at accident scenes, in emergency rooms and in intensive care units. Expand
Pneumothorax effects on pulmonary acoustic transmission.
Investigation of the changes in sound transmission in the thorax due to PTX in humans found that sound transmission measurement was able to distinguish between baseline and PTX states in this small patient group. Expand
A numerical model to study auscultation sounds under pneumothorax conditions
  • S. Ramakrishnan, S. Udpa, L. Udpa
  • Engineering, Medicine
  • 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society
  • 2009
A 2D viscoelastic finite-difference time-domain is used to simulate sound propagation of lung sounds in the human thorax and lends itself for development of advanced auscultatory techniques for detection of pneumothorax using noninvasive acoustic sensors. Expand
Hemopneumothorax detection through the process of artificial evolution - a feasibility study
A novel, objective device for rapid diagnosis of potentially lethal thoracic injuries and with further optimization, such a device could provide real-time detection and monitoring of pneumothorax and hemothsorax in battlefield conditions. Expand
A physical approach to the automated classification of clinical percussion sounds.
Critical parameters that effectively subdivide percussion signals into three main groups, historically known as "tympanic," "resonant," and "dull," are identified, opening the possibility for automated diagnostics of air/liquid inclusions in the thorax and abdomen. Expand
Highly sensitive monitoring of chest wall dynamics and acoustics provides diverse valuable information for evaluating ventilation and diagnosing pneumothorax.
Bilateral monitoring of the chest dynamics and acoustics provide novel information that is sensitive to asymmetric changes in ventilation, enabling early detection and localization of pneumothorax. Expand
Breath sound changes associated with malpositioned endotracheal tubes
It is suggested that computerised analysis of breath sounds may be useful for assessment of ETT positioning, and more studies are needed to test the feasibility of this approach further. Expand
Automated Classification of Medical Percussion Signals for the Diagnosis of Pulmonary Injuries
Used for centuries in the clinical practice, audible percussion is a method of eliciting sounds by areas of the human body either by finger tips or by a percussion hammer. Despite its advantages,Expand
Identification of Endotracheal Tube Malpositions Using Computerized Analysis of Breath Sounds via Electronic Stethoscopes
Breath sound characteristics using electronic stethoscopes placed over each hemithorax and epigastrium are assessed to determine their ability to detect ETT malposition and preliminary results suggest that this technique, when incorporated into a 3-component, electronicStethoscope-type device, may be an accurate, portable mechanism to reliably detect ETt malposition in adults when ETco2 may be unavailable or unreliable. Expand
Computerised analysis of auscultatory sounds associated with vascular patency of haemodialysis access
Vascular stenosis changes were found to be associated with changes in acoustic amplitude and/or spectral energy distribution, and computerised analysis of vascular sounds may be useful in vessel patency surveillance. Expand


Pneumothorax detection using pulmonary acoustic transmission measurements
Pneumothorax was found consistently to lower the pulmonary acoustic transmission in the 200–1200 Hz frequency band, whereas smaller transmission changes occurred at lower frequencies (p<0.0001, sign test), which implies that pneumothoraces can be reliably detected using pulmonaryoustic transmission measurements in the current animal model. Expand
Acoustic properties of the normal chest.
Clearly, further studies need to be performed in order to elucidate the true mechanisms involved in generating vesicular lung sounds, the redistribution of intrapulmonary gas or vibrations caused by the stretching of lung tissue. Expand
Breath Sounds: Development Of A System For Measurement & Analysis
Breath sounds, recorded from healty young males between the ages of 25–36, have been analyzed to determine spectral content during specific segments of the pulmonary cycle. Subjects were screened toExpand
Monitoring the state of the human airways by analysis of respiratory sound.
Redistribution of pulmonary blood volume following transition from Earth gravity to the weightless state probably alters the caliber of certain airways and doubtless alters sound transmission properties of the lung and can be monitored effectively and non-invasively by spectral analysis of pulmonary sound. Expand
Airflow effects on amplitude and spectral content of normal breath sounds.
BSA-F relationships were not frequency dependent during expiration but were significantly stronger in higher than in lower frequencies during inspiration over both posterior bases, compatible with sound generation by turbulent flow in a bifurcating network with 1) flow separation, downstream movement of eddies, and 3) collision of fast-moving cores of the inflowing air with carinas. Expand
Acoustic characteristics of air cavities at low audible frequencies with application to pneumoperitoneum detection
The findings suggest that the proposed technique may be useful in the diagnosis of pneumoperitoneum, and suggest a possible reduction in the resonant and anti-resonant frequencies with decreasing air cavity volumes. Expand
Spectral characteristics of chest wall breath sounds in normal subjects.
These data define the boundaries of normal chest wall breath sounds and may be used as reference for comparison with abnormal sounds. Expand
Spectral characteristics of normal breath sounds.
  • N. Gavriely, Y. Palti, G. Alroy
  • Chemistry, Medicine
  • Journal of applied physiology: respiratory, environmental and exercise physiology
  • 1981
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. Expand
Poor breath sounds with good voice sounds. A sign of bronchial stenosis.
The auscultatory finding of disparity in breath and voice sounds, the former being absent or faint whereas the latter are easily heard when compared to the corresponding site over the opposite lung,Expand
Distribution of regional ventilation measured by breath sounds.
The ratio of basal to apical Ib/Tn increased from residual volume to total lung capacity, indicating that the ventilation to lower portions of the lung increases as lung volume increases. Expand