Breathing Systems And The Anesthesia Machine

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| By Djagasia
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Djagasia
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Quizzes Created: 1 | Total Attempts: 1,274
| Attempts: 1,274
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  • 1/5 Questions

    A size "E" compressed-gas cylinder completely filled with N20 contains how many liters?

    • 1160
    • 1470
    • 1590
    • 1640
    • 1750
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  • 2. 

    The pressure gauge on a size "E" compressed-gas cylinder containing 02 reads 1600 psi. How long could 02 be delivered from this cylinder at a rate of 2L/min?

    • 90 minutes

    • 140 Minutes

    • 250 Minutes

    • 320 Minutes

    • Cannot be calcluated

    Correct Answer
    A. 250 Minutes
    Explanation
    US Manufacturer's require that all compressed-gas cylinders containing O2 for medical use be painted green. A compressed-gas cylinder completely filled with O2 has a pressure of approximately 2000psi and contains approximately 625L of gas. According to Boyle's Law the volume of gas remaining in a closed container can be estimated by measuring the pressure within the container. Therefore, when the pressure gauge on a compressed-gas cylinder containing O2 shows a pressure of 1600 psi, the cylinder contains 500L of O2. At a gas flow of 2L/min, O2 could be delivered from the cylinder for approximately 250 minutes.

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  • 3. 

    Considering the Mapleson circuits and their relative efficiency with respect to prevention of rebreathing CO2, which of the following statements regarding spontaneous ventilation is TRUE?

    • A>DFE>BC

    • DFE>A>BC

    • BC>DFE>A

    • DFE>BC>A

    • A>BC>DFE

    Correct Answer
    A. A>DFE>BC
    Explanation
    To summarize the relative efficiency of different Mapleson systems with respect to prevention of rebreathing, during spontaneous ventialtion, A>DFE>BC. During controlled ventilation, DFE>BC>A
    Remember "A Dog Can Bite" (Usually a spontaneous event)
    "Dead Babies can't assist" (controlled)

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  • 4. 

    Vaporizers of which of the following Volatile Anesthetics could be used interchangeably with accurate delivery of the concentration of anesthetic set on the vaporizer dial?

    • Halothane, sevo, iso

    • Sevo and Iso

    • Halothane and Sevo

    • Halothane and Iso

    • Sevo and Des

    Correct Answer
    A. Halothane and Iso
    Explanation
    Agent-specific Vaporizers, are designed for each volatile anesthetic. However, volatile anesthetics with identical saturated vapor pressures could be used interchangeably with accurate delivery of the volatile anesthetic.
    Agent Vapor Pressure at 20C
    Halothane 243
    Enflurane 172
    Sevoflurane 160
    Isoflurane 240
    Desflurane 669
    Methoxyflurane 23

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  • 5. 

    Which of the following is/are the safest configuration(s) for the flow meter sequence?

    • Nitrous oxide ->air-> 02->outlet

    • O2 -> nitrous oxide ->air-> outlet

    • Air ->nitrous oxide->O2-> outlet

    • O2-> air->nitrous oxide-> outlet

    Correct Answer
    A. O2 -> nitrous oxide ->air-> outlet
    Explanation
    It has been demonstrated that, in the presence of a flow meter leak, a hypoxi mixture is less likely to occur if the O2 flowmeter is located downstream from all other flowmeters. A potentially dangerous arrangement has the nitrous oxide flowmeter located in teh deownstream position. A hypoxi miture can result, because a substantial portion of O2 flow passes through the leak, and all the nitrous oxide is directed to the common outlet. A safer configuration has the O2 flowmeter located in the downstream position. A portion of the nitrous oxide flow escapes through the leak and the remainder goes toward the common outlet. A hypoxic mixture is less likely, because all the O2 flow is advanced by the nitrous oxide. A leak in the O2 flow tube can produce a hypoxic mixture even when O2 is located in the downstream position.

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  • Current Version
  • Mar 22, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 12, 2009
    Quiz Created by
    Djagasia
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