title: Mean lung pressure during adult high-frequency oscillatory ventilation: an experimental study using a lung model.
abstract: In adult high-frequency oscillatory ventilation (HFOV), stroke volume (SV) and mean lung pressure (PLung) are important for lung protection. We measured the airway pressure at the Y-piece and the lung pressure during HFOV using a lung model and HFOV ventilators for adults (R100 and 3100B). The lung model was made of a 20-liter, airtight rigid plastic container (adiabatic compliance: 19.3 ml/cmH2O) with or without a resistor (20 cmH2O/l/sec). The ventilator settings were as follows: mean airway pressure (MAP), 30 cmH2O; frequency, 5-15 Hz (every 1 Hz); airway pressure amplitude (AMP), maximum;and % of inspiratory time (IT), 50% for R100, 33% or 50% for 3100B. The measurements were also performed with an AMP of 2/3 or 1/3 maximum at 5, 10 and 15 Hz. The PLung and the measured MAP were not consistently identical to the setting MAP in either ventilator, and decreasing IT decreased the PLung in 3100B. In conclusion, we must pay attention to the possible discrepancy between the PLung and the setting MAP during adult HFOV.
authors.affiliation: Department of Emergency and Critical Care Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.takahiro.5152@gmail.com.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hirayama
authors.forename: Osamu
authors.initials: O
authors.lastname: Nagano
authors.forename: Naoki
authors.initials: N
authors.lastname: Shiba
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yumoto
authors.forename: Keiji
authors.initials: K
authors.lastname: Sato
authors.forename: Michihisa
authors.initials: M
authors.lastname: Terado
authors.forename: Toyomu
authors.initials: T
authors.lastname: Ugawa
authors.forename: Shingo
authors.initials: S
authors.lastname: Ichiba
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Ujike
mesh_terms: D000328:Adult; D000399:Air Pressure; D004867:Equipment Design; D006612:High-Frequency Ventilation / Q000295:instrumentation* / Q000379:methods*; D006801:Humans; D001239:Inhalation / Q000502:physiology; D008168:Lung / Q000502:physiology*; D008954:Models, Biological; D008961:Models, Structural; D012121:Respiration, Artificial / Q000295:instrumentation / Q000379:methods; D013318:Stroke Volume / Q000502:physiology