Anesthesia Equipment Chapter 5 Flashcards Preview

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Flashcards in Anesthesia Equipment Chapter 5 Deck (18)
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1
Q

The high pressure system of the anesthesia machine includes:

A

the hanger yokes

2
Q

The Pin Index Safety System:

A

has specific locations for pins and holes for each gas

3
Q

When placing a cylinder in the yoke:

A

the first step is to fully retract the retaining screw

the PISS components must be mated

4
Q

The pressure regulator:

A

supplies a relatively constant outlet pressure while the source pressure is reduced

can be either direct or indirect acting

5
Q

The intermediate pressure system includes:

A

the pipeline pressure gauge

the oxygen flush

6
Q

The oxygen failure safety valve:

A

may or may not cut off the flow of air if the oxygen supply fails

7
Q

The oxygen supply pressure alarm will:

A

be activated by a disconnected oxygen pipeline hose

be activated if the oxygen pipeline pressure is low

8
Q

The oxygen flush valve:

A

must be protected against accidental activation

9
Q

Which of the following statements about flowmeters are correct?

A. Parallel flowmeters are used in new anesthesia machines
B. Flowmeter tubes work on the principle of the variable orifice
C. The inside of a flow tube containing a ball is smooth
D. The pressure drop across the indicator is constant for all positions in the tube

A

B and D

B. Flowmeter tubes work on the principle of the variable orifice

D. The pressure drop across the indicator is constant for all positions in the tube

10
Q

The rate of flow through a flowmeter tube depends on:

A

the pressure drop across the constriction

the size of the annular opening

the physical properties of the gas

11
Q

If a flowmeter tube is broken:

A

the tube, indicator, and scale must be replaced as a unit

12
Q

Effects of the physical characteristics of the gas passing through the flowmeter include:

A

at low flows, flow is a function of the viscosity of the gas

viscosity of the gas is more important with a longer and narrower constriction

with high flows, flow depends more on the density of the gas

the density of the gas is more important with a shorter and wider constriction

13
Q

Correct statements concerning the order of flowmeter tubes include:

A

a leak in the flowmeter that is farthest from the manifold outlet may result in loss of gas from the middle flowmeter

the oxygen flowmeter should be next to the manifold outlet

14
Q

Concerning mandatory minimum oxygen flow:

A

it is sometimes associated with an alarm

15
Q

Correct statements concerning the minimum oxygen ratio control include:

A

if the flow of nitrous oxide is increased, the oxygen flow is automatically increased with a mechanical linkage

the gases are independently controlled when the oxygen percentage is above the minimum

it can be a mechanical or pneumatic link

16
Q

What are the functions of the hanger yoke?

A

ensuring a unidirectional gas flow into the anesthesia machine

providing a gas-tight seal

orienting and supporting the cylinder

17
Q

Gas cylinder valves on the anesthesia machine with a pipeline supply should be kept closed for the following reasons:

A

so that a pipeline pressure failure will be recognized early

to prevent gas from flowing retrograde into the pipeline system

to prevent pressure alterations in the pipeline from drawing down the cylinder contents

18
Q

Which physical principles govern the gas flow through a mechanical flowmeter?

A

the elevation of the indicator is a measure of the annular area for flow

temperature changes affect the density and viscosity of gases and thus significantly alter the accuracy of flowmeters

short, wide constrictions cause more turbulent flow