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Resources: Glossary

The Glossary contains terms commonly associated with ventilators, the community, and respiratory physiology. Click on a hyperlinked letter to view the entries that begin with that letter, then scroll down in the window to find the word you are looking for.

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F Fraction - The number of moles (gram molecular weights) of a component gas in a gas mixture divided by the total number of moles of mixture. Alternatively, it can be expressed as the ratio of the partial volume of the component gas to the total volume of the mixture. It is numerically equal to the ratio of the partial pressure of the component gas to the total pressure of the mixture.
F Fahrenheit Temperature scale that assigns the value 32 for the freezing temperature of water and 212 for its boiling point.
FDA United States Food and Drug Administration
FIO2 Fraction of Inspired Oxygen (See F [Fraction])
Flexible Bronchoscope (See Bronchoscope.)
Flow-By Flow introduced into the circuit typically for use in triggering the ventilator based on the flow demand of the patient, rather than pressure. The term "Flow-By" was likely introduced in the Puritan Bennett 7200 series ventilators. Flow triggering is usually much more sensitive than pressure triggering (see also Bias Flow).
Flow-Control Mode A mode of ventilator operation in which the ventilator attempts to deliver a preset flow waveform with a specified peak flow during inspiration.

(See F [Fraction])

Frequency (of breathing) (fb) Number of breath cycles per unit time. Typically, the unit of time is minutes (conventional ventilation) but can be seconds for high frequency ventilation.
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