| Relationship between tracheal air flow and induced changes in intrathoracic volume. A basis for calibration of pneumocardiogram. | |
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MedLine Citation:
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PMID: 3398247 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The volume of air moved into the trachea due to ventricular activity--a record of which is the pneumocardiogram (PNCG)--is always less than true stroke volume. A new method of investigating this relationship consists of inducing a known volume change (delta V in) within the thorax and measuring the volume of air (delta V out) recorded with a pneumotachograph connected to the trachea. The range of delta V in was from 4 ml to 36 ml. A linear relationship (mean r = 0.98, p less than 0.001) between delta V out and delta V in was observed in 19 anesthetized, intubated dogs: delta V out = (f) delta V in, where f = 0.53 +/- 0.09 (mean +/- SD). The coefficient, f, ranged from 0.40 to 0.71. These results demonstrate that although f is subject-dependent, delta V out reliably reflects changes in delta V in. It is suggested that the technique of inducing a known volume change within the thorax and measuring the volume of air recovered from the trachea could be used as a method for calibrating the pneumocardiogram to obtain stroke volume. |
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Authors:
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J L Wessale; J D Bourland; L A Geddes |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Japanese heart journal Volume: 29 ISSN: 0021-4868 ISO Abbreviation: Jpn Heart J Publication Date: 1988 Jan |
Date Detail:
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Created Date: 1988-09-07 Completed Date: 1988-09-07 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0401175 Medline TA: Jpn Heart J Country: JAPAN |
Other Details:
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Languages: eng Pagination: 99-106 Citation Subset: IM |
Affiliation:
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Hillenbrand Biomed. Eng. Cntr., Purdue University, West Lafayette, IN 47907. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Airway Resistance Animals Calibration Dogs Esophagus / physiology Heart Function Tests / instrumentation, methods* Regression Analysis Respiration* Stroke Volume Thorax / physiology* Trachea / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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HL22321/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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