high frequency oscillation
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oscillation
[os″ĭ-la´shun]a backward and forward motion, like that of a pendulum; also vibration, fluctuation, or variation.
high frequency oscillation a type of high frequency ventilation characterized by the use of active expiration.
high fre·quen·cy os·cil·la·tion
(HFO) (hī frē'kwĕn-sē os'i-lā'shŭn)A type of mechanical ventilation.