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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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C Celsius (Centigrade) - Temperature scale that assigns 0 to the freezing point of water and 100 to its boiling point.
Carbon Dioxide CO2 - Produced by the body's metabolism; transported by the blood to the lungs through which it is eliminated by ventilating of the lungs.
CCU Depending on the context, either Critical Care Unit or Cardiac Care Unit.
Circuit (See Patient Circuit.)
Clark Electrode Electrochemical device sensitive to PO2 of oxygen contained in blood.
cm H2O Centimeters of Water - unit of pressure.
Compliance (C), also called Static Compliance (Cst) The change of volume divided by the associated change of pressure across a purely elastic structure, or the same ratio measured when a structure that contains resistance and/or inertance is completely static before and after the changes occur. Mathematically, the slope (constant of proportionality) of a linear static pressure difference - volume relation.
Control Mode (See CV-Controlled Ventilation.)
Control Panel location of the primary means of directly adjusting the function of a device.
Controlled Ventilation A mode of ventilator operation in which machine breaths are delivered at preset intervals.
COPD Chronic Obstructive Pulmonary Disease - Ex.: Emphysema, Asthma
CPAP Continuous Positive Airway Pressure - A mode of ventilator operation in which the airway pressure remains above ambient during spontaneous breaths.
CRF Chronic Respiratory Failure - Long standing inability to eliminate carbon dioxide through the lungs.
CV (See Controlled Ventilation.)
Cycling Pressure That pressure which, when reached in the breathing circuit, causes the ventilator to cycle from one phase to another, e.g., from inhalation to expiration or vice versa.
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