Effect of high‐frequency oscillation on pressure delivered by high flow nasal cannula in a premature infant lung model

2019 ◽  
Vol 54 (11) ◽  
pp. 1860-1865 ◽  
Author(s):  
David M. Rub ◽  
Emidio M. Sivieri ◽  
Soraya Abbasi ◽  
Eric Eichenwald
Keyword(s):  
Premature Infant ◽  
High Frequency ◽  
High Flow ◽  
Nasal Cannula ◽  
Lung Model ◽  
High Frequency Oscillation ◽  
High Flow Nasal Cannula ◽  
Frequency Oscillation

Pendelluft and mixing in a single bifurcation lung model during high-frequency oscillation

1988 ◽  
Vol 65 (1) ◽  
pp. 146-155 ◽  
Author(s):  
J. S. Ultman ◽  
R. G. Shaw ◽  
D. C. Fabiano ◽  
K. A. Cooke
Keyword(s):  
Bifurcation Point ◽  
High Frequency ◽  
Direct Relationship ◽  
Lung Model ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Mixing Coefficients ◽  
Longitudinal Mixing ◽  
Flow Oscillations ◽  
Bell Shaped Curve

A single bifurcation with an adjustable daughter branch compliance ratio (VR) was used to simultaneously study pendelluft and longitudinal mixing during flow oscillations at frequencies (f) of 1-15 Hz and amplitudes (VOp) of 25-150 ml/s. Mixing coefficients (Deff) were determined from the dispersion of a CO2 bolus centered at the bifurcation point, and pendelluft volume was computed as a fraction of mother branch tidal volume (PVF) using measurements of airflow in the daughter branches. Plotted against frequency, PVF was a bell-shaped curve insensitive to the value of VOp. When VR = 2, a PVF peak of 0.25 appeared at f = 3 Hz, and when VR = 5, a PVF peak of 0.75 appeared at f = 4 Hz. After normalization by control values at VR = 1, Deff curves were also bell shaped, insensitive to the value of VOp and with peaks appearing at the same frequencies as the PVF peaks. The normalized Deff peak values were 1.7 when VR = 2 and 4.0 when VR = 5. The similarities in the PVF and Deff curves imply a direct relationship between pendelluft and enhanced mixing.

scholarly journals Humidification in Very-High-Flow Nasal-Cannula Therapy in an Adult Lung Model

2019 ◽  
Vol 64 (7) ◽  
pp. 809-817 ◽  
Author(s):  
Yusuke Chikata ◽  
Keisuke Morinishi ◽  
Masaji Nishimura
Keyword(s):  
High Flow ◽  
Nasal Cannula ◽  
Lung Model ◽  
High Flow Nasal Cannula ◽  
Adult Lung ◽  
Very High

1044: UNDERSTANDING HIGH-FLOW NASAL CANNULA NONINVASIVELY WITH AN IN VITRO BREATHING INFANT LUNG MODEL

2016 ◽  
Vol 44 (12) ◽  
pp. 337-337 ◽  
Author(s):  
Michelle Gardner ◽  
P. Worth Longest ◽  
Laleh Golshahi
Keyword(s):  
High Flow ◽  
Nasal Cannula ◽  
Lung Model ◽  
High Flow Nasal Cannula

High-Frequency Oscillation and Chronic Lung Disease in Very Low Birth Weight Infants

PEDIATRICS ◽  
2001 ◽  
Vol 108 (1) ◽  
pp. 212-214
Author(s):  
J. P. Shenai; ◽  
P. Rimensberger; ◽  
U. Thome ◽  
F. Pohlandt; ◽  
P. Rimensberger
Keyword(s):  
Birth Weight ◽  
Low Birth Weight ◽  
Lung Disease ◽  
Chronic Lung Disease ◽  
High Frequency ◽  
Very Low Birth Weight ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Low Birth Weight Infants
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