Document Detail

Effect of Leak and Breathing Pattern on the Accuracy of Tidal Volume Estimation by Commercial Home Ventilators: A Bench Study.
MedLine Citation:
PMID:  23051878     Owner:  NLM     Status:  Publisher    
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.
Manel Luján; Ana Sogo; Xavier Pomares; Eduard Monsó; Bernat Sales; Lluís Blanch
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-8
Journal Detail:
Title:  Respiratory care     Volume:  -     ISSN:  0020-1324     ISO Abbreviation:  Respir Care     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7510357     Medline TA:  Respir Care     Country:  -    
Other Details:
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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