| HFO-A | high-frequency oscillatory [ventilation]-active [expiratory phase] |
|---|---|
| HFOV | high-frequency oscillatory ventilation |
| HFP | hexafluoropropylene; high-frequency pulsation; hypofibrinogenic plasma |
| HFPPV | high-frequency positive pressure ventilation |
| HFR | high-frequency recombination |