| Effect of Leak and Breathing Pattern on the Accuracy of Tidal Volume Estimation by Commercial Home Ventilators: A Bench Study. | |
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MedLine Citation:
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PMID: 23051878 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BACKGROUND: New home ventilators are able to provide clinicians data of interest through built-in-software. Monitoring of tidal volume is a key point in the assessment of the efficacy of home mechanical ventilation. OBJECTIVE: To assess the reliability of the tidal volume (VT) provided by five ventilators in a bench test. METHODS: Five commercial ventilators from four different manufacturers were tested in pressure support mode with the help of a breathing simulator under different conditions of mechanical respiratory pattern, inflation pressure, and intentional leakage. Values provided by the built-in-software of each ventilator were compared breath to breath with the VT monitored through an external pneumotachograph. Ten breaths for each condition were compared for every tested situation. RESULTS: All tested ventilators underestimated VT (ranges of -21.7 to -83.5 mL that corresponded to a - 3.6 to -14.7 % of the externally measured VT). A direct relationship between leak and underestimation was found in four ventilators, with higher underestimations of the VT when the leakage increased, ranging between -2.26 and -5.56 % for each 10L/min increase in the leakage. A ventilator which included an algorithm that computes the pressure loss through the tube as a function of the flow exiting the ventilator had the minimal effect of leaks on the estimation of VT (0.3%). In three ventilators the underestimation was also influenced by mechanical pattern (lower underestimation with restrictive, and higher with obstructive). CONCLUSIONS: The inclusion of algorithms that calculate the pressure loss as a function of the flow exiting the ventilator in commercial models may increase the reliability of VT estimation. |
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Authors:
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Manel Luján; Ana Sogo; Xavier Pomares; Eduard Monsó; Bernat Sales; Lluís Blanch |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-10-8 |
Journal Detail:
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Title: Respiratory care Volume: - ISSN: 0020-1324 ISO Abbreviation: Respir Care Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-10-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7510357 Medline TA: Respir Care Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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