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| Safety Valve |
A high pressure relief valve. |
| SaO2 |
Oxygen Saturation of Arterial
Blood - (See Oxygen
Saturation.) |
| Saturated Water Vapor |
The maximum amount of water
vapor that air can hold at a given combination of pressure
and temperature. |
| Saturation Pressure |
The partial pressure of
saturated water vapor for a given combination of total
pressure and temperature. |
| SCCM |
Society
of Critical Care Medicine |
| Self Test |
A set of pre-use tests performed
by the ventilator on itself typically requiring no intervention
by the operator. |
| Sensitivity, Flow Sensitivity,
Pressure Sensitivity |
(See
Trigger
Flow, Trigger
Pressure.) |
| Severinghaus Electrode |
Electrochemical device sensitive
to PCO2 of carbon dioxide in solution. |
| Sigh |
A controlled, substantial
increase in the tidal volumes of a small number of successive
assisted breaths produced at preset intervals. |
| SIMV |
Synchronized Intermittent
Mandatory Ventilation - A ventilator mode of operation
in which assisted breaths are delivered at a set frequency
with spontaneous breaths permitted in between delivered
breaths. The assisted breaths are synchronized with spontaneous
efforts when their timing is sufficiently close. If no
efforts are detected during the set inter-assisted breath
interval, a mandatory breath is delivered. |
| Sinusoidal |
Varying as a sine wave. |
| Spirometer |
A device that continuously
measures, at the local temperature and pressure, the volume
of gas flowing through, or into and out of, it. |
| Spontaneous Breathing |
Movement of gas into and
out of the lungs produced by the patient's respiratory
muscles. |
| Square Wave |
A wave shape that rises
instantaneously to a constant value that is maintained
for a set time interval, after which it instantaneously
falls to a new value. The term "square" wave
is a misnomer since, invariably, the wave shape produced
is rectangular and not strictly square. |
| Straight Line |
A relation of the form Y
= aX + b. When b = 0, this is a linear relation. |
