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(ok″si-jĕn-āt′ŏr) A device for mechanically oxygenating blood, e.g., during thoracic or open-heart surgery.

bubble o. A device to oxygenate fluids mechanically, as during thoracic or open-heart surgery. It is a technological ancestor of membrane oxygenators.

oxygen concentrator

A device used for home oxygen therapy that removes most of the nitrogen from room air and delivers the oxygen at a low flow rate. SYN: oxygen enricher.

oxygen-conserving device

SEE: under device.

oxygen consumption

The quantity of oxygen taken into the body during a minute, measured in milliliters per minute (mL/min). It increases from a resting baseline value as the work (or exercise) performed by a person increases.

oxygen content

The amount of oxygen in volume percent that is present in the blood at any one moment. Arterial oxygen content = (Hemoglobin x 1.36 x SaO2) + (0.0031 x PaO2).

oxygen debt

SEE: under debt.

oxygen delivery system

An apparatus that provides a concentration of inhaled oxygen greater than that of room air. A fixed-performance oxygen delivery system provides a consistent oxygen concentration. A variable-performance oxygen delivery system provides an oxygen concentration that may vary with changes in the patient's breathing pattern.

oxygen hood

Head hood.


(ŏk″sĭ-jĕn′ĭk) [″ + gennan, to produce] Concerning, resembling, containing, or consisting of oxygen.


(ŏk′sĭ-jĕ-nīz) Oxidize.

oxygen-reduction test

(ok′si-jĕn-rĕ-dŭk shŏn) A test of a patient's ability to oxygenate safely without supplemental oxygen. The fractional concentration of inspired oxygen. (FiO2) is decreased in 2% increments while the patient's heart rate, oxygen saturation, and respiratory rates are monitored. A patient, e.g., a neonate, passes the test when the monitored parameters remain stable even after the FiO2 = 21% (ambient air, atmospheric oxygenation).

oxygen saturation

ABBR: SaO2. The percent of arterial hemoglobin saturated with oxygen. SaO2 can be monitored noninvasively with a pulse oximeter. It is normally higher than 96%. SYN: oxyhemoglobin saturation.

oxygen therapy

The administration of oxygen at higher levels than are normally found in the atmosphere to patients needing enhanced tissue oxygen uptake. Oxygen can be administered via nasal cannulae, Venturi masks, nonrebreathing masks, continuous positive-pressure ventilation devices, endotracheal tubes, or in airtight or hyperbaric chambers, depending on the needs of the patient. Each of these modes of therapy has its own benefits and limitations. Nasal cannulae facilitate speaking and eating but can ...

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