Which form of HFV utilizes a flow interrupter?

• A. HFPPV
• B. HFFI
• C. HFPV
• D. HFOV

Answer: (B)

High-Frequency Flow Interruption (HFFI) is the correct option because it specifically employs a flow interrupter as the mechanism for generating ventilation. In HFFI, gas flow is cyclically interrupted, allowing for rapid delivery of small tidal volumes at high frequencies. This method provides effective ventilation while minimizing the risk of barotrauma by maintaining lower mean airway pressures when compared to traditional ventilation strategies.

In contrast, the other modes mentioned do not utilize a flow interrupter in their mechanisms. High-Frequency Positive Pressure Ventilation (HFPPV) and High-Frequency Positive Ventilation (HFPV) utilize positive pressure to deliver breaths, while High-Frequency Oscillatory Ventilation (HFOV) employs oscillatory patterns instead of flow interruption for ventilation. These differences highlight why HFFI is distinguished from the others by its unique use of a flow interrupter.