-
Pediatr Crit Care Me · Nov 2011
Effect on work of breathing of different continuous positive airway pressure devices evaluated in a premature neonatal lung model.
- Werner Nikischin, Marianthi Petridis, Julia Noeske, Dietmar Spengler, and Philipp von Bismarck.
- Department of Pediatrics and Dentistry, University of Kiel, Kiel, Germany. nikischin@pediatrics.uni-kiel.de
- Pediatr Crit Care Me. 2011 Nov 1;12(6):e376-82.
ObjectiveA device for the application of continuous positive airway pressure to switch injected breathing gas to the outlet during expiration, known as Infant Flow, claims to reduce work of breathing and peak pressure change. So far the Infant Flow system has been investigated in lung models with tidal volumes of not <12 mL. However, premature neonates below 1000 g of weight generate a tidal volume of approximately 4 mL only. The aim of this study was to compare work of breathing and peak pressure change of the Infant Flow and another system that uses nasal prongs, Baby Flow, with conventional continuous positive airway pressure delivered by a pharyngeal tube.DesignLaboratory investigation, basic research.SettingUniversity research laboratory.ModelA piston pump simulating the spontaneous breathing of premature neonates was connected without leak to three different continuous positive airway pressure devices (pharyngeal tube, Baby Flow, and Infant Flow) and with a produced leak to the systems using nasal prongs (Baby Flow and Infant Flow).InterventionThe pressures of the airway and continuous positive airway pressure systems and airway flow were recorded. Peak pressure change and work of breathing were determined for all systems and settings. Percentages of reduction of peak pressure change and work of breathing in relation to the continuous positive airway pressure delivered by pharyngeal tube were calculated.Measurements And Main ResultsThe switching of injected breathing gas to the outlet during expiration of Infant Flow systems require a tidal volume of at least 5 mL. It was possible to decrease peak pressure change and work of breathing: Baby Flow system at a tidal volume of 4 mL (Inspiration: peak pressure change 82%, work of breathing 80%; Expiration: peak pressure change: 68%, work of breathing: 61%) and at a tidal volume of 8 mL (Inspiration: peak pressure change 75%, work of breathing 73%; Expiration: peak pressure change: 67%, work of breathing: 57%). Infant Flow system at tidal volume of 4 mL (Inspiration: peak pressure change 50%, work of breathing 55%; Expiration: peak pressure change: 46%, work of breathing: 43%) and at a tidal volume of 8 mL (Inspiration: peak pressure change 47%, work of breathing 46%; Expiration: peak pressure change: 24%, work of breathing: 23%), related to the continuous positive airway pressure delivered by pharyngeal tube without leak.Even under conditions of leak peak pressure change and work of breathing could be reduced: Baby Flow system at a tidal volume of 4 mL (Inspiration: peak pressure change 59%, work of breathing 64%; Expiration: peak pressure change: 68%, work of breathing: 59%) and at a tidal volume of 8 mL (Inspiration: peak pressure change 45%, work of breathing 43%; Expiration: peak pressure change: 54%, work of breathing: 53%). Infant Flow system at a tidal volume of 4 mL (Inspiration: peak pressure change 49%, work of breathing 53%; Expiration: peak pressure change: 44%, work of breathing: 40%) and at a tidal volume of 8 mL (Inspiration: peak pressure change 48%, work of breathing 43%; Expiration: peak pressure change: 36%, work of breathing: 40%), related to the continuous positive airway pressure delivered by pharyngeal tube without leak.ConclusionPeak pressure change and work of breathing were decreased by Baby Flow and Infant Flow systems, even under conditions of leak.
Notes
Knowledge, pearl, summary or comment to share?You can also include formatting, links, images and footnotes in your notes
- Simple formatting can be added to notes, such as
*italics*
,_underline_
or**bold**
. - Superscript can be denoted by
<sup>text</sup>
and subscript<sub>text</sub>
. - Numbered or bulleted lists can be created using either numbered lines
1. 2. 3.
, hyphens-
or asterisks*
. - Links can be included with:
[my link to pubmed](http://pubmed.com)
- Images can be included with:
![alt text](https://bestmedicaljournal.com/study_graph.jpg "Image Title Text")
- For footnotes use
[^1](This is a footnote.)
inline. - Or use an inline reference
[^1]
to refer to a longer footnote elseweher in the document[^1]: This is a long footnote.
.