| High frequency components of tracheal sound are emphasized during prolonged flow limitation. | |
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MedLine Citation:
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PMID: 19349649 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A nasal pressure transducer, which is used to study nocturnal airflow, also provides information about the inspiratory flow waveform. A round flow shape is presented during normal breathing. A flattened, non-round shape is found during hypopneas and it can also appear in prolonged episodes. The significance of this prolonged flow limitation is still not established. A tracheal sound spectrum has been analyzed further in order to achieve additional information about breathing during sleep. Increased sound frequencies over 500 Hz have been connected to obstruction of the upper airway. The aim of the present study was to examine the tracheal sound signal content of prolonged flow limitation and to find out whether prolonged flow limitation would consist of abundant high frequency activity. Sleep recordings of 36 consecutive patients were examined. The tracheal sound spectral analysis was performed on 10 min episodes of prolonged flow limitation, normal breathing and periodic apnea-hypopnea breathing. The highest total spectral amplitude, implicating loudest sounds, occurred during flow-limited breathing which also presented loudest sounds in all frequency bands above 100 Hz. In addition, the tracheal sound signal during flow-limited breathing constituted proportionally more high frequency activities compared to normal breathing and even periodic apnea-hypopnea breathing. |
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Authors:
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M Tenhunen; E Rauhala; E Huupponen; A Saastamoinen; A Kulkas; S-L Himanen |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-04-06 |
Journal Detail:
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Title: Physiological measurement Volume: 30 ISSN: 0967-3334 ISO Abbreviation: Physiol Meas Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-05-06 Completed Date: 2009-07-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9306921 Medline TA: Physiol Meas Country: England |
Other Details:
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Languages: eng Pagination: 467-78 Citation Subset: IM |
Affiliation:
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Department of Clinical Neurophysiology, Tampere University Hospital, Medical Imaging Centre, Pirkanmaa Hospital District, Tampere, Finland. mirja.tenhunen@pshp.fi |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Aged Female Humans Male Middle Aged Pulmonary Ventilation* Respiratory Mechanics* Sleep Apnea Syndromes / physiopathology* Sound Spectrography Trachea / physiology* Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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