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10 Cards in this Set
- Front
- Back
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Describe changes made in the TEC 6 vaporizer at high altitude.
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Required dial setting = Normal dial setting (vol %) x 760 mm Hg/Ambient pressure in mmHg
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Describe the relationship between vapor pressure and atmospheric pressure.
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They are independent of each other.
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Define boiling point.
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Temperature at which vapor pressure= atmospheric pressure
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What is the relationship between boiling point and altitude?
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At a higher altitude, lower barometric pressure creates a lower boiling point.
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Boiling pts of volatile anesthetics
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halothane 50.2 ºC
• enflurane 56.5 ºC • isoflurane 48.5 ºC • desflurane 23.5 ºC • sevoflurane 58.5 ºC |
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What is the pressure regulating valve?
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One critical point is located at the pressure regulating valve which is located between the sump shut off valve and the concentration
control valve (R2). This pressure regulating valve reduces the pressure from the vaporizing chamber to about 1.1 atm (74 mm Hg) [fresh gas flow rate equals approximately 10 L/min |
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How do you conduct a test on the desflurane vaporizer?
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1. Press and hold the mute button until all lights and alarms activated.
2. Turn on to at least 1% and unplug the electrical connection. A "No Output" alarm should ring within seconds. This tests battery power for the alarms. This step is crucial in relation to the quick emergence characteristics of this agent- any interruption in its supply must be noted and responded to at once. |
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What would happen if the wrong agent was placed in the wrong vaporizer?
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Well, the effect would depend on the vapor pressure of the misfilled agent. If you placed an agent with higher vapor
pressure into a vaporizer designed for an agent of lower vapor pressure, more agent would be delivered than the set dial. If you placed an agent of lower vapor pressure into a vaporizer designed for an agent of higher vapor pressure, less agent would be delivered than the set dial. |
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What is the pumping effect?
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The concentration delivered during controlled or assisted ventilation can be higher than when vaporizer output flows free without
intermittent back pressure. • Problem is worsened by increased back pressure, low flows, low volume % dial settings. Effect caused by some fresh gas flow molecules being forced back into the vaporizing chamber, thus effectively altering splitting ratio. |
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What is the pressurizing effect?
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Lessened vapor output will occur if sustained increases in pressure distal to vaporizer outlet (i.e., a ventilator where an amount
of PEEP is kept on). • Problem worsened by high flowrates, large pressure fluctuations, and low vaporizer settings. • The pumping effect has greater clinical significance generally. |
