Scavenging

Question 1

What collects excess gases from equipment used to administer anesthesia or exhaled by the patient & the removal of these gases to an appropriate place of discharge outside the work environment

Answer 1

scavenging system

Question 2

What captures gases at site of emission?

Answer 2

Gas-collecting assembly

Question 3

What carry collected gases to interface?

Answer 3

Transfer tubing

Question 4

What provides positive (& sometimes negative) pressure relief & may provide reservoir capacity?

Answer 4

interface

Question 5

What carries gases to point where they are discharged?

Answer 5

Gas disposal system

Question 6

Location of gas collecting assemblies:

Answer 6

• Breathing systems
• Ventilators
• Respiratory gas monitors
• Leak sites

Question 7

What describes these characteristics?

• A length of tubing with a connector at either end
• As short as possible
• Wide enough to carry high flows without significant pressure increase
• 19 or 30-mm inlet/outlet fittings
• Resistant to kinking & occlusion
• Easy to see & disconnect
• Different color than breathing system

Answer 7

transfer tubing

Question 8

An open interface scavenging system has a _____ _____ ____.

Answer 8

positive pressure relief

Question 9

What interface has these characteristics?

• Has 1 or more openings to atmosphere
• Contains no valves
• Reservoir needed to hold gas surges
• Reservoir allows disposal system flow rate to be above gas-collecting assembly flow rate
• Should only be used with active disposal
• Safety depends on patency of vents to atmosphere

Answer 9

open interface

Question 10

Anesthetic gases from transfer means enter at the top of the _______& are conducted to base where they are dispersed

Answer 10

reservoir

Question 11

A closed interface scavaging system connects to atmosphere through ______.

Answer 11

valves

Question 12

Positive pressure relief valve always required in an open interface. True or false?

Answer 12

false, in a CLOSED one

Question 13

Negative pressure relief valve required only with _______ disposal system.

Answer 13

active

Question 14

Reservoir not required in an ____ _____ system.

Answer 14

closed interface

Question 15

Positive Pressure Relief Only used only with a ______ disposal system

Answer 15

passive

Question 16

Positive & Negative Pressure Relief
Used only with _____disposal system

Answer 16

active

Question 17

In a passive negative pressure relief valve always closed. True or false?

Answer 17

true

Question 18

In an active, closed system, _______ pressure relief valve closes during high flows from gas-collecting assembly

Answer 18

negative

Question 19

In a closed, active system, negative pressure relief valve ____ when gas-disposal assembly flow is greater than flow of gases entering gas-collecting assembly

Answer 19

opens

Question 20

In the closed system, if bag continually collapsed or negative pressure relief valve opens frequently, then ____ the ____

Answer 20

lower the flow

Question 21

In a closed system, if bag is distended or positive pressure relief valve opens frequently, _____ flow

Answer 21

increase

Question 22

Gas disposal tubing is ______ and ______ tubing with passive systems to minimize resistance

Answer 22

short

wide

Question 23

Scavenging tubing colors are usually ______or _____

Answer 23

purple

yellow

Question 24

What disposal system do these characteristics describe?

• Pressure is raised above atmospheric by patient exhaling, by manually squeezing the reservoir bag, or by a ventilator
• There is positive pressure in gas-disposal tubing

Answer 24

passive

Question 25

Active or passive disposal? * Room ventilation system * Piping direct to atmosphere * Absorption device

Answer 25

passive

Question 26

Circulating or noncirculating of passive disposal? * Takes in fresh air & processes it by filtering & adjusting humidity & temperature * Processed air is circulated thru the room then all expelled to atmosphere * Attach disposal tubing to exhaust grille

Answer 26

noncirculating

Question 27

Recirculating or noncirculating of passive disposal? * A small amount of air taken in from atmosphere while remaining air is recirculated * The volume of fresh air taken in is equal to the amount exhausted * Waste gases must be vented beyond recirculation point

Answer 27

recirculating

Question 28

Piping Direct To Atmosphere benefits (2)

Answer 28

* Easy to use * Low maintenance costs

Question 29

Problems of passive disposal? (3)

Answer 29

* Positive/negative pressure caused by wind currents or obstruction * Need to ensure system patency * Requires special installation

Question 30

What: * Removes anesthetic agents by converting them to harmless substances * Usually activated charcoal in canisters * Efficiency depends on agent, flow rate thru canister, & moisture

Answer 30

absorption device

Question 31

Disadvantages of passive absorption system: (6)

Answer 31

* Expensive * Short life span * Storage/disposal problems * Requires monitoring or weighing to determine whether adsorber is saturated * Significant resistance with large canister * CAN NOT ABSORB N2O

Question 32

Passive disposal system advantages:

Answer 32

* Simpler than active systems * Less expensive than active systems

Question 33

Passive disposal is not as effective in lower trace gas levels because\_\_\_\_ ____ promotes outward leaks.

Answer 33

positive pressure

Question 34

What disposal is this? * Uses a flow-inducing device to move gases * There is negative pressure in gas-disposal tubing

Answer 34

active disposal

Question 35

Examples of active disposal system: (2)

Answer 35

Piped vacuum Active duct system

Question 36

Piped Vacuum Problems (6)

Answer 36

* Inadequate number of vacuum outlets * Inconvenient outlets * System overload * Damage to vacuum system * Personnel exposure * Inconvenience

Question 37

What system is this? * **A dedicated evacuation system that leads to outside** * Uses flow-inducing devices (fans, pumps, blowers, etc.) * **Moves large volumes of gas at low negative pressures** * Negative pressure prevents contamination & atmospheric conditions from affecting outflow

Answer 37

active duct system

Question 38

Active Duct System Advantages (2)

Answer 38

**Resistance is not a problem** Wind does not affect system

Question 39

Disadvantages of what system? * Complex * Requires negative pressure relief & reservoir capacity in interface * Requires special installation * Flow-inducing device requires added energy & maintenance

Answer 39

active disposal

Question 40

Disadvantages of active disposal system: (4)

Answer 40

* Expensive * Not automatic (must be turned on/off) * More complex than passive systems * Requires interface to have negative pressure relief