Mapleson System

Question 1

List the components of an open breathing system

Answer 1

Insufflation, blow-by, no mask, no valves

Question 2

List the components of a semi-open breathing system

Answer 2

mask on face, breathing of anesthetics and room air, CO2 accumulation, open drop technique, unidirectional valve, room pollution

Question 3

List the components of a semi-closed breathing system

Answer 3

• Most common, what we use

- unidirectional valves (inspir/expir), no room air, FGF can be less than pt’s MV, scavenging system, CO2 absorber

Question 4

List the components of a closed breathing system

Answer 4

Anesthetic gases containedin system, not vented, gases rebreathed, questionalble gas concentrations, need CO2 absorber

Question 5

Components of Mapleson system

Answer 5

Reservoir bag, corrugated tubing, APL valve, fresh gas inlet and pt connection

Question 6

What doesn’t the Mapleson system have?

Answer 6

CO2 absorber, unidirectional valves, separae inspir and expir limbs

Question 7

What controls rebreathing or the lack thereof in the Mapleson system?

Answer 7

Fresh gas flow

Question 8

List components of Mapleson A system

Answer 8

• FGF at opp end from pt
• most efficient w/ spont ventilation (APL valve will remain open)
• During controlled vent APL valve is tightened

Question 9

Why s tightening of the APL valve not recommended?

Answer 9

D/T the venting of fresh gas out APL valve and rebreathing of alveolar gases

Question 10

List components of Mapleson B system

Answer 10

-FG inlet and APL near pt

Question 11

What occurs during spontaneous ventilation in the Mapleson B system?

Answer 11

APL remains open

• On expiration when reservoir bag full APL opens and vents both FGF and exhaled gases
• On inspiration both exhaled and FGF will be inspired

Question 12

What occurs during controlled/assisted ventilation in the Mapleson B system?

Answer 12

Acts similar to Mapleson A but pt will inhale more FG as more will accumulate near pt end

Question 13

List the components of the Mapleson C system?

Answer 13

Identical to Mapleson B w/o corrugated tubing

Question 14

List the componens of the the Mapleson D system?

Answer 14

• Has t-piece connector near pt end (as do E & F)
• Has pt connector port, FG port, and connector corrugated tubing
• popular - scavenging is easy and most efficient for controlld vent

Question 15

List characteristics of Bain system,

Answer 15

Falls under Mapleson D system
-a modification w/ co-axial tubing
APL open tubing during spont resp
APL tightened during assisted or manual controlled
(excess gases are vented during inspiration. can mechanically ventilate by substituting vent fo reservoir bag

Question 16

List the components of the Mapleson E sytem

Answer 16

• commonly known as a t-piece
• use during anesthesia is uncommon
• used to administerhumidified gas to spontaneously breathing intubated pts
• controlled ventilation can only be performed by intermittently occluding the expirtory limb and allowing the FGF to inflate the lungs
• not recommended and can cause barotrauma

Question 17

List the components of the Mapleson F system

Answer 17

• AKA Jackson-Rees system

- Functions similar to Mapleson D

Question 18

Which system is most efficient with spontaneous ventilation?

Answer 18

Mapleson system A is most efficient
-requires FGF only 1X MV to prevent rebreathing
A>D/F/E >B/C >A