||Relation among pH, bicarbonate
ion concentration and free CO2 in a solution. (See Henderson-Hasselbalch
Equation in "Tools
of the Trade" under "Resources")
||High Frequency Jet Ventilation
- A type of high-frequency ventilation in which gas is
delivered into the airway as a pulsating stream from a
small diameter catheter passed through the endotracheal
||High Frequency Oscillatory
Ventilation - A type of high-frequency ventilation in
which the applied high frequency expiratory pressure and
delivered volume are negative relative to their base line
||High Frequency Ventilation
- A form of ventilatory support characterized by breathing
frequencies in excess of 80 breaths per minute and tidal
volumes on the order of the anatomical dead space.
|High Pressure Relief
Valve (safety valve)
||A device that prevents the
pressure in the patient circuit from exceeding a preset
limit by venting excess flow to the atmosphere.
|High Priority Alarm
||A combination of audible
and visual signals indicating that immediate operator
response is required.
||Heat and Moisture Exchanger
- A passive device designed to collect and hold some of
the heat and moisture from the patient's exhaled breath,
and to return them to the inspired gas mixture during
||A device that adds water
in the form of vapor to a gas mixture.
||The amount of water vapor
contained in a given volume of air.
||Hertz - Unit of frequency
, cycles per second (cps).