What type of HFV is characterized by positive pressure?

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

Answer: (A)

High-frequency positive pressure ventilation (HFPPV) is characterized by delivering gas to the lungs using positive pressure at a high frequency. In this mode, the ventilator inflates the lungs with small volumes of air at rapid rates, maintaining adequate oxygenation and ventilation while minimizing the risk of lung injury associated with conventional ventilation techniques.

This method contrasts with other modalities that may use different mechanisms such as jet ventilation or oscillatory techniques, which may not rely on positive pressure in the same manner.

In HFPPV, the positive pressure is essential for ensuring that gas flow reaches the alveoli effectively, supporting gas exchange. The main goal is to maintain lung inflation while allowing for rapid and efficient ventilation, offering a unique approach to managing patients with specific respiratory needs.