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Noninvasive high frequency oscillatory ventilation through nasal prongs: bench evaluation of efficacy and mechanics.
MedLine Citation:
PMID:  20857278     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
BACKGROUND: Noninvasive high frequency oscillatory ventilation through nasal prongs (nHFOV) has been proposed as a new respiratory support in neonatology. We studied the effect of ventilation parameters and nasal prongs on nHFOV efficacy and mechanics.
METHODS: Customized sealed circuits connecting a SM3100A oscillator to a neonatal lung model were developed to evaluate the effect of applying HFOV via two different sized nasal prongs on delivered tidal volume and pressure. Measurements were made across a range of frequencies and pressures; amplitude was set to obtain visible lung oscillation.
RESULTS: Volume delivered by peak-to-peak oscillation, ventilation, and pressure significantly differed among the interfaces, being higher for large cannulae and the control circuit (p < 0.0001). The interposition of a large or small nasal prong reduced volume to 56 and 26%, ventilation to 32 and 9%, and mean pressure to 83 and 79%, respectively, of the values measured for the direct connection of the oscillator to the test lung. Volume and ventilation were inversely related to frequency, which was particularly evident with larger diameter circuits due to higher delivered tidal volume (R (2) > 0.9). Increasing ventilation was associated with larger tidal volume and nasal prong diameter (adjusted R (2) = 0.97).
CONCLUSIONS: nHFOV using common nasal prongs is technically possible. Efficiency of tidal volume delivery is significantly affected by prong diameter.
Authors:
Daniele De Luca; Virgilio P Carnielli; Giorgio Conti; Marco Piastra
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Publication Detail:
Type:  Journal Article     Date:  2010-09-21
Journal Detail:
Title:  Intensive care medicine     Volume:  36     ISSN:  1432-1238     ISO Abbreviation:  Intensive Care Med     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7704851     Medline TA:  Intensive Care Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2094-100     Citation Subset:  IM    
Affiliation:
Division of Neonatology and Institute of Mother and Child Health, G.Salesi Women and Children Hospital, Polytechnical University of Marche, Ancona, Italy. dm.deluca@fastwebnet.it
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