Basic Principles
Like with any other mode of mechanical ventilation, the basic goal of high-frequency ventilation (HFV) is to deliver oxygen to and clear carbon dioxide from the blood, while minimizing ventilator-induced lung injury (VILI) as much as possible. In order to achieve this goal, a constant pressure, often referred to as mean airway pressure or continuous distending pressure (CDP), is applied to the lungs. This CDP stabilizes airways and alveoli/saccules. Superimposed on this CDP are small pressure swings, usually at a frequency of 6–15 Hz or 240–900 cycles/min, resulting in small volume changes of approximately 1–3 ml/kg. Despite the fact that these volume changes are sometimes smaller than the anatomical dead space, HFV is very efficient in clearing carbon dioxide from the lungs. Some of the mechanisms responsible for adequate gas exchange during HFV are coaxial flow, asymmetric velocity profiles, the pendelluft effect and molecular diffusion.
High-Frequency Modalities
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van Kaam, A.H., Keszler, M. (2012). Mechanical Ventilation: HFV. In: Elzouki, A.Y., Harfi, H.A., Nazer, H.M., Stapleton, F.B., Oh, W., Whitley, R.J. (eds) Textbook of Clinical Pediatrics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02202-9_20
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