Anesthesi circuits and ventilators

Question 1

What are the different types of anesthesia breathing circuits? (4)

Answer 1

Open
Semi-open
Semi-closed
Closed

Question 2

This is the method by which the first true anesthetics were given. A bit of cloth saturated with ether or chloroform was held over the patient’s face. The patient breathed the vapors and became anesthetized.

Answer 2

Open

Question 3

Semi-open examples (6)

Answer 3

Mapleson A-F

Question 4

Parts common in a semi-closed circuit (3)

Answer 4

1) Fresh gas
2) Corrugated tubing
3) Pop-off valve

Question 5

Advantage of a semi-closed circuit

Answer 5

1) Simple
2) Can change anesthesia depth rapidly
3) Portable
4) Lack of rebreathing

Question 6

Disadvantage

Answer 6

1) Lack of conservation of heat & moisture
2) Limited scavenging
3) High FGF

Question 7

Parts of a semi-closed system

Answer 7

1) Inspiratory limb
2) Expiratory limb
3) Unidirectional valves
4) CO2 absorber
5) Reservoir bag,
6) Pop-off valve (expiratory limb)

Question 8

The prototypical semiclosed circuit is the?

Answer 8

Circle system

Question 9

Advantage of circle system (3)

Answer 9

1) Conserves heat
2) Low FGF
3) Can scavenge

Question 10

Disadvantage of a circle system (1)

Answer 10

1) Multiple connections and can cause disconnections

Question 11

Rank the Mapleson circuits in order of efficiency for controlled

Answer 11

(Dog Bites Can Ache)

Controlled: D > B > C > A

Question 12

Rank the Mapleson circuits in order of efficiency for spontaneous

Answer 12

(All Dogs Can Bite)

Spontaneous: A > D > C > B

Question 13

What circuit is most commonly used in anesthesia delivery systems today?

Answer 13

Circle syste,

Question 14

Soda lime is the most common absorber, and at most can absorb ____ L of CO2 per 100 g of absorbent.

Answer 14

23

Question 15

Factors affecting efficiency of absorption include (3)

Answer 15

1) Size of the canister
2) Size of absorbent granule
3) Channeling

Question 16

Optimal size of absorbent

Answer 16

2.5 mm between 4 and 8 mesh

Question 17

Most common dye used for absorbent

Answer 17

Ethyl violet

Question 18

How can you check the competency of a circle system?

Answer 18

You should close the pop-off valve, occlude the Y-piece, and press the O2 flush valve until the pressure is 30 cm H2O. The pressure will not decline if there are no leaks.

Question 19

What gas is used to drive the bellows in an anesthesia ventilator?

Answer 19

O2

Question 20

pressure inside the bellows is always slightly higher than in the chamber outside which is?

Answer 20

1 to 2 cm H2O

Question 21

A patient being ventilated with an ascending bellows ventilator is usually subjected to _ to _ cm H2O because of the weight of the bellows.

Answer 21

2.5 to 3 cmH2O