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medical gas humidity
humidity and aerosol therapy
| Question | Answer |
|---|---|
| Rehydration of retained secreton can cause what hazard? | Mucus pluging |
| If temperature of a saturated gas DECREASES | Absolute humidity INCREASES |
| Common UNIT of MEASUREMENT in HUMIDITY | Milligrams of water vapor per liter of gas (mg/L) |
| Air fully saturated with 100% WATER VAPOR | 37 Celsius |
| Air fully saturated with BAROMETRIC PRESSURE | 760 mmHg |
| Air fully saturated with WATER VAPOR PRESSURE | 47 mmHg |
| Air fully saturated with ABSOLUTE HUMIDITY | 44 mg/L |
| Barometric pressure is MEASURED by | Barometer |
| Barometric pressure EFFECTS atmospheric availability of | Oxygen |
| When barometric pressure DECREASES | Elevation INCREASES |
| Define ABSOLUTE | Actual CONTENT of WATER in a MEASURED VOLUME of AIR |
| Define RELATIVE | Ratio of ACTUAL water vapor content to its SATURATED CAPACITY at a given TEMPERATURE |
| How is RELATIVE HUMIDITY expressed | Percentage |
| How is RELATIVE HUMIDITY measured | Hygrometer |
| % RH formula | Content (absolute humidity) / saturated capacity (at certain temp) x 100 |
| Capacity at 37 C is how much in (mg/L) | 44 mg/L |
| Define % BODY HUMIDITY | ratio of its ACTUAL WATER VAPOR CONTENT to WATER VAPOR CAPACITY in saturated gas at 37 C - capacity is fixed at 44 mg/L |
| Formula for % body humidity | (Content) / (44 mg/L) |
| Define humidity DEFICIT | Amount of water vapor that the body must add to a gas in order |
| Formula for Humidity Deficit | (water vapor capacity) - (actual water vapor content) [44 mg/L] |
| Not changing out the water in the reservoir of a humidifying device every 24 hours will cause | Cross contamination |
| Define CONDENSATION | Cooling of gas causes water vapor to turn back into liquid state - returns heat and warms the surrounding environment |
| Define VAPORIZATION (evaporation) | Liquid is changed into gas form. - cools the adjacent air |
| Cooling gas | causes its capacity to hold water vapor to decrease |
| Warming of gas | Gas raises its capacity to hold water vapor, vaporization is increased |
| If a gas is heated to body temperature (37 degrees) | Capacity to hold water vapor increases to 44 mg/mL |
| If the gas leaves the unit and flows through tubing exposed to room air | Condensation will occur - the temperature of room air is cooler causing vapor to turn back into liquid |
| Influence of pressure: High pressure in atmosphere | Decreases vaporization (keeps water in) |
| Influence of pressure: Low pressure in atmosphere | Increases vaporization (more pressure in unit than air, so water goes out) |
| Influence of surface area: Greater surface area | Greater liquid evaporation - applied to the design of some humidifiers to increase their ability to put water vapor in the passing gas |
| Temperature: temperature increase | evaporation INCREASES ( capacity increases and movement of particles increase so more escape/evaporate ) |
| Temperature: temperature decreases | evaporation DECREASES |
| Time: increased time exposed | INCREASES humidity |
| Time : decreased exposure time | DECREASES humidity |
| Factors affecting evaporation: | 1. Influence of Pressure 2. Influence of Surface Area 3. Temperature 4. Time |
| Poses risks to patient and caregiver | Condensation |
| Can waste a lot of water | Condensation |
Created by:
dxb.0323
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