Journal: Pediatric Critical Care Medicine
Article Title: High Frequency Oscillatory Ventilation
doi: 10.1007/978-1-4471-6356-5_10
Figure Lengend Snippet: Effect of frequency, amplitude, and ETT diameter on tidal volume delivery during HFOV. Data shown in this figure were collected during ventilation of a test lung (MI Instruments, Grand Rapids, MI) with a 3100B oscillator. In these experiments, bias flow is constant at 30 L/min, compliance is constant at 30 mL/cm H 2 O, and I:E is constant at 1:2. Tidal volume is measured using an adult hot wire anemometer. Panel ( a ) depicts the relationship between tidal volume and pressure amplitude at a range of frequencies (4–12 Hz), using an 8 mm (inner diameter) endotracheal tube ( ETT ). Increasing frequency by 2 Hz reduces tidal volume by an average of 21.3 ± 4.1 %. A similar frequency-tidal volume relationship was confirmed by the investigators in a series of adult patients with ARDS, intubated with an 8 mm ETT. In these patients, increasing amplitude by 10 cm H 2 O produced an average tidal volume increase of only 5.6 ± 4.5 %. Panel ( b ) depicts the effect of ETT diameter on the relationship between tidal volume and pressure amplitude, at 4 and 12 Hz (Reprinted from Hager et al. . With permission Wolters Kluwer Health)
Article Snippet: More recently, the SensorMedics 3100B high-frequency oscillatory ventilator (CareFusion, Yorba Linda, CA) became available for use in larger pediatric patients (>35 kg) and adult patients.
Techniques: Produced