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28 Cards in this Set
- Front
- Back
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What criterion is used to determine the type of ventilator?
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It is described by how the bellows move during EXPIRATION
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What is the greatest danger in a descending bellows machine?
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Unrecognized disconnection of the patient.
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What are the controls on the front of control module anesthesia machine used for?
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Select the volume, rate and limit the pressure of the gas to be delivered to the patient's airway;
control components that allow inhalation or exhalation; respond to high pressure in the patient's airway; display information about the % of oxygen in the gas supplied to the patient, and the volume of gas exhaled from the patient; select alarm limits for oxygen %, airway pressure and exhaled volume; display and sound alarms when alarm limits are exceeded |
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What is on the rear panel of the control module anesthesia machine?
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Electric power cable;
Supply gas inlet (either O2 or medical grade compressed air) Before changing from one gas to another, must be recalibrated!! |
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What is the tidal volume of the anesthesia machine?
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50 to 1500ml per breath
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What is the rate range in completed cycles (of the anesthesia machine)?
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2 to 100 breaths per minute.
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What is the flow rate range (of drive gas) of the anesthesia machine?
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10 to 100 l/min
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What tidal volume is usually delivered to the patient by the anesthesia machine?
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Usually 10-15ml/kg, depending on age, etc. Most providers adjust depending on ETCO2 and PIP
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In relationship to the anesthesia machine,
what is the purpose of the flow control valve? |
The flow control valve
Precisely meters gas flow to bellows housing during inspiration. |
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In relationship to the anesthesia machine,
what is the purpose of the exhalation valve? |
It opens the exhaust chamber to the atmosphere
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In relationship to the anesthesia machine,
what is the purpose of the free breathing valve? |
If patient creates negative pressure in circuit, the valve will open to allow ventilation (even though the vent is on).
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In relationship to the anesthesia machine,
what is the purpose of the inspiratory pause? |
When the inspiratory pause is on, the exhalation valve stays inflated at the end of inspiration for an additional 25% of the inhalation time.
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How does the Airway Pressure Transducer of the anesthesia machine provide safety?
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The PAP is continuously monitored during the anesthetic;
the AW pressure monitor compares the sensed pressure to the setting on the control panel - if the pressure reaches the pre set limit, the ventilator stops the inhalation phase and begins the exhalation phase |
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How does the High Pressure Limit Switch contribute to the safe operation of the anesthesia machine?
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It opens at at 110 cm H2O
(It works independent of the Airway Pressure Transducer..) |
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What is the purpose of & how does the High Pressure Limit Switch contribute to the safe operation of the anesthesia machine?
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It drives pressure and alarms if pressure falls below 22 psig. It automatically fails vent if 30 psig is sensed. This ensures that driving pressure is within a set safe parameter
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Two LEDs are located by the alarm silence, yellow & red. What are their purposes?
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YELLOW indicates an alarms that require prompt operator response or awareness. This can indicate incorrect settings, an indirect affect on the patient, or potential harm to the equipment.
RED indicates alarms that require immediate attention of the operator. **These are high priority alarms that warn of possible danger for the patient** |
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When more than one alarm condition is present, how does the anesthesia machine handles it?
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The display alternates between them.
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What is the order of priority of audible alarms on the Ohmeda 7800?
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Warble
Continuous Intermittent Single Beep |
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Of the following alarms, which
can be silenced permanently, a. Power failure b. Ventilator failure c. Oxygen sensor failure d. Oxygen calibration error e. Volume senor failure f. All of the above h. None of the above |
f. All of the above
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How is the shelf life of oxygen sensor cartridges typically extended?
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They are kept refrigerated.
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Why is it advisable not to break oxygen sensor cartridges?
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They contain caustic chemicals that can burn the skin.
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How often should you calibrate your oxygen sensor?
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EVERY TIME you do your morning anesthesia machine check
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How you calibrate your oxygen sensor?
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Check that it will calibrate to 21% (room air) by removing it from the circuit and exposing it to room air for 3-5 minutes.
Rotate the thumb wheel to adjust to 21% if needed. |
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How is the tidal volume of the anesthesia machine set up?
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Turbine vane transducer is located at the expiratory limb of the circuit and
the sensor clip snaps onto transducer cartridge. |
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What is the purpose of the waste scavenging systems & what are the two types?
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It remove gases vented from the breathing system which helps to minimize venting of waste gases into the OR.
The 2 types are: Active Passive |
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Excess (or waste) gas from the breathing circuit is vented through the APL valve when the selector switch is on “______”
Waste gas is vented from the ventilator when the selector switch is on “________” ? |
Bag
Ventilator |
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Describe the active scavenging system?
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Connects to hospital suction system;
Positive and negative pressure relief valves prevent fluctuation to the patient; A 3 liter reservoir bag is present (holds excess gas until it can be removed); The positive relief valve opens at 5cm H20 ( with exhalation by the patient or ventilator); At -0.25cm H2O the negative pressure valve opens to prevent suctioning from the circuit |
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Describe the passive scavenging system?
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Interfaces with hospital ventilation duct;
Relies on the build up of gases in the bag to passively empty into the hospital ventilation system. **May see both active and passive systems in the same institution** |
