Tracheal sound detector

Heemels, Jan Pieter; Ros, H. H.; Sipkema, Pieter; Vries, Frits de

doi:10.1007/bf02443933

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…By the mid-1970s, other types of microphone were being adopted; condenser and externally polarized microphones [6,12,[26][27][28][29][30], or electret microphones [23,[31][32][33][34]. A few research teams experimented with dynamic microphones [30], accelerometers, and various piezoelectric contact microphones [35][36][37][38], but the most suitable type was generally considered to be the condenser microphone [23].…”

Section: Sensorsmentioning

confidence: 99%

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Acoustic properties of the normal chest

Dalmay

Antonini²,

Marquet³

et al. 1995

Eur Respir J

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Laënnec invented the stethoscope in 1816 and published a treatise on auscultation in 1819. We then had to wait until the 1950s to observe development of modern devices and methods of recording and signal-processing, which allowed objective studies of lung sounds in time and frequency fields.Tracheobronchial sounds generated by ventilation originate in the upper airways, the frequency content of these sounds has led to extensive research. Consolidated lungs act as more efficient sound conductors to the chest wall (bronchial breathing murmur). Tracheobronchial sounds contain higher frequency components compared to vesicular lung sounds.The origin of vesicular lung sounds has been becoming progressively clear for about 10 yrs. It is at least partly produced locally, deep, and probably intralobular. 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.The devices developed are already useful for monitoring the state of patients in intensive care. Sooner or later, real time analysis and automated diagnosis will become available.

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Section: Sensorsmentioning

confidence: 99%

“…Coupling devices have included: 1) the circular plastic bell-endpiece from a stethoscope [27,41]; 2) a cylindrical probe made of polyvinylchloride (PVC) [29]; 3) a plastic cone [22,23]; 4) a rubber diaphragm fitted over a metal alloy tube [32]; and 5) a small plastic tube [21,34].…”

Section: Sensorsmentioning

confidence: 99%

Acoustic properties of the normal chest

Dalmay

Antonini²,

Marquet³

et al. 1995

Eur Respir J

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“…For example, Heemels et al [22] reported that thoracic impedance monitoring of an infant failed to record periods of obstructive apnea because of artefact due to movement and response time. The difficulties may be compounded when rapid respiratory events, such as occur in swallowing, need to be followed, especially as the act of swallowing may be accompanied by some movement of torso or an arm used in self-feeding studies.…”

Section: Discussionmentioning

confidence: 99%

Comparative Review of Techniques for Recording Respiratory Events at Rest and during Deglutition

et al. 1997

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The coordination between swallowing and respiration is essential for safe feeding, and noninvasive feeding-respiratory instrumentation has been used in feeding and dysphagia assessment. Sometimes there are differences of interpretation of the data produced by the various respiratory monitoring techniques, some of which may be inappropriate for observing the rapid respiratory events associated with deglutition. Following a review of each of the main techniques employed for recording resting, pre-feeding, feeding, and post-feeding respiration on different subject groups (infants, children, and adults), a critical comparison of the methods is illustrated by simultaneous recordings from various respiratory transducers. As a result, a minimal combination of instruments is recommended which can provide the necessary respiratory information for routine feeding assessments in a clinical environment.

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The need for standards in recording and analysing respiratory sounds

Mussell

1992

Med. Biol. Eng. Comput.

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Respiratory sounds (RSs) recorded from the chest and trachea are nowadays being electronically analysed by many investigators with a view to (i) determining the mechanisms of their production, and (ii) to develop automated diagnostic systems based on RS analysis, that objectively categorise RS as being associated with health or respiratory diseases. However, one problem that hampers this type of research is that almost every RS investigation team uses different equipment, protocols and analysis methods which, to varying degrees, makes inter-investigator results difficult to compare. The review first discusses the many variables involved in RS recording and analysis, and the different approaches used by different investigators, to highlight this problem and its consequences. Secondly, although the review cannot propose immediately acceptable guidelines and standards for RS analysis, it proposes a 'seed' set of guidelines that are 'up for discussion' between investigators in the field, the final goal being to inject a degree of standardisation in equipment and methods that are acceptable to all involved.

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Tracheal sound detector

Cited by 9 publications

References 6 publications

Acoustic properties of the normal chest

Acoustic properties of the normal chest

Comparative Review of Techniques for Recording Respiratory Events at Rest and during Deglutition

The need for standards in recording and analysing respiratory sounds

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