page_title: High-frequency ventilation
section_title: ΔP and amplitude
hierarchical_section_title: High-frequency ventilation / High-frequency ventilation (active) / CareFusion 3100A and 3100B / Breath delivery / Settings and measurements / ΔP and amplitude
caption_attribution_description: English: Tidal volume versus power setting
context_page_description: High-frequency ventilation is a type of mechanical ventilation which utilizes a respiratory rate greater than four times the normal value. and very small tidal volumes. High frequency ventilation is thought to reduce ventilator-associated lung injury, especially in the context of ARDS and acute lung injury. This is commonly referred to as lung protective ventilation. There are different types of high-frequency ventilation. Each type has its own unique advantages and disadvantages. The types of HFV are characterized by the delivery system and the type of exhalation phase.
  High-frequency ventilation may be used alone, or in combination with conventional mechanical ventilation. In general, those devices that need conventional mechanical ventilation do not produce the same lung protective effects as those that can operate without tidal breathing. Specifications and capabilities will vary depending on the device manufacturer.
context_section_description: The power setting is set as amplitude to establish a measured change of pressure (ΔP).  Amplitude/Power is a setting which determines the amount of power that is driving the oscillator piston forward and backward resulting in an air volume (tidal volume) displacement.  The effect of the amplitude on the ΔP that it is changed by the displacement of the oscillator piston and hence the oscillatory pressure (ΔP).  The power setting interacts with PAW conditions existing within the patient circuit to produce the resulting ΔP.
caption: Tidal volume versus power setting
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