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.
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