Journal article
Multifrequency Oscillatory Ventilation in the Premature Lung: Effects on Gas Exchange, Mechanics, and Ventilation Distribution
Anesthesiology (Philadelphia), Vol.123(6), pp.1394-1403
12/2015
DOI: 10.1097/ALN.0000000000000898
PMCID: PMC4679436
PMID: 26495977
Abstract
Despite the theoretical benefits of high-frequency oscillatory ventilation (HFOV) in preterm infants, systematic reviews of randomized clinical trials do not confirm improved outcomes. The authors hypothesized that oscillating a premature lung with multiple frequencies simultaneously would improve gas exchange compared with traditional single-frequency oscillatory ventilation (SFOV). The goal of this study was to develop a novel method for HFOV, termed "multifrequency oscillatory ventilation" (MFOV), which relies on a broadband flow waveform more suitable for the heterogeneous mechanics of the immature lung.
Thirteen intubated preterm lambs were randomly assigned to either SFOV or MFOV for 1 h, followed by crossover to the alternative regimen for 1 h. The SFOV waveform consisted of a pure sinusoidal flow at 5 Hz, whereas the customized MFOV waveform consisted of a 5-Hz fundamental with additional energy at 10 and 15 Hz. Per standardized protocol, mean pressure at airway opening ((Equation is included in full-text article.)) and inspired oxygen fraction were adjusted as needed, and root mean square of the delivered oscillatory volume waveform (Vrms) was adjusted at 15-min intervals. A ventilatory cost function for SFOV and MFOV was defined as (Equation is included in full-text article.), where Wt denotes body weight.
Averaged over all time points, MFOV resulted in significantly lower VC (246.9 ± 6.0 vs. 363.5 ± 15.9 ml mmHg kg) and (Equation is included in full-text article.)(12.8 ± 0.3 vs. 14.1 ± 0.5 cm H2O) compared with SFOV, suggesting more efficient gas exchange and enhanced lung recruitment at lower mean airway pressures.
Oscillation with simultaneous multiple frequencies may be a more efficient ventilator modality in premature lungs compared with traditional single-frequency HFOV.
Details
- Title: Subtitle
- Multifrequency Oscillatory Ventilation in the Premature Lung: Effects on Gas Exchange, Mechanics, and Ventilation Distribution
- Creators
- David W Kaczka - University of Iowa, AnesthesiaJacob Herrmann - University of Iowa, Roy J. Carver Department of Biomedical EngineeringC Elroy ZonneveldDavid G TingayAnna LavizzariPeter B NobleJ Jane Pillow
- Resource Type
- Journal article
- Publication Details
- Anesthesiology (Philadelphia), Vol.123(6), pp.1394-1403
- DOI
- 10.1097/ALN.0000000000000898
- PMID
- 26495977
- PMCID
- PMC4679436
- ISSN
- 0003-3022
- eISSN
- 1528-1175
- Grant note
- UM1 HL108724 / NHLBI NIH HHS
- Language
- English
- Date published
- 12/2015
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Anesthesia
- Record Identifier
- 9984007166002771
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