scavenging

Question 1

what is the most important step in reducing trace gases?

Answer 1

scavenging

Question 2

what is Collection of 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 2

scavenging

Question 3

In scavenging, what Captures gases at site of emission

Answer 3

Gas-collecting assembly

Question 4

In scavenging what carries collected gases to interface

Answer 4

transfer tubing

Question 5

In scavenging what provides positive (& sometimes negative) pressure relief & may provide reservoir capacity

Answer 5

the interface

Question 6

what carries gases from interface to gas disposal system

Answer 6

gas-disposal tubing

Question 7

what carries gases to point where they are discharged

Answer 7

gas disposal system

Question 8

what size fitting is on gas collecting assembly of the scavenging system?

Answer 8

30 mm male

Question 9

what type of gas collecting assembly breathing system does not have a APL valve?

Answer 9

T- piece system

Question 10

True or false. Waste gas is directed to the same interface used by breathing system

Answer 10

true

Question 11

what is important about transfer tubing

Answer 11

as short as possible

wide enough to carry high flows with out significant pressure

19 - 30 mm inlet/outlet

resistant to kinking

Question 12

what Prevents pressure increases/decreases in scavenging system from being transmitted to breathing system or ventilator

Answer 12

interface

Question 13

where should interface be positioned?

Answer 13

close to gas-collecting assembly as possible

Question 14

What are the components of an interface

Answer 14

Positive pressure relief
Negative pressure relief
Reservoir capacity

Question 15

what are the features of a closed interface

Answer 15

Connects to atmosphere thru valves
Positive pressure relief valve always required
Negative pressure relief valve required only with active disposal system
Reservoir not required

Question 16

What is the purpose of the positive pressure relief valve?

Answer 16

always required to allow gases to be released into the room if there is obstruction of the scavenging system downstream of the interface.

Question 17

what is the purpose of the negative pressure relief valve?

Answer 17

(pop-in, inlet relief) valve is necessary to allow air to be entrained when the pressure in the reservoir falls below atmospheric

Question 18

True or False. Positve and Negative pressure relief is used only with closed active disposal

Answer 18

True

Question 19

In a closed active scavenging system when does the pressure relief valve close

Answer 19

during high flows from gas-collecting assembly

Question 20

in a closed active scavenging, Negative pressure relief valve opens when

Answer 20

gas-disposal assembly flow is greater than flow of gases entering gas-collecting assembly

Question 21

what should be done when the scavenging reservoir bag continually collapsed or negative pressure relief valve opens frequently

Answer 21

lower the flow

Question 22

what should be done when the scavenging reservoir bag is distended or positive pressure relief valve opens frequently

Answer 22

increase flow

Question 23

what colors are scavenging tubes usually?

Answer 23

purple

or

yellow

Question 24

what are the features of an active disposal system?

Answer 24

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

Question 25

what are advantages of active duct active disposal

Answer 25

Resistance is not a problem
Wind does not affect system

Question 26

what are disadvantages of acitve duct active disposal?

Answer 26

Complex
Requires negative pressure relief & reservoir capacity in interface
Requires special installation
Flow-inducing device requires added energy & maintenance

Question 27

what are overall advantages of active disposal system

Answer 27

Usually more effective at keeping pollution levels low
Allow small-bore tubing
No excessive resistance
Aid in room air exchange

Question 28

what are overall disadvantages of active disposal system

Answer 28

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