Anesthesia Machine, Breathing Circuits, Inhalants (Pt. 1 &2) Flashcards

1
Q

Where does the breathing circuit begin?

A

Fresh gas outlet

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2
Q

Most common portable tank? Pressure and volume?

A

E tank

2,000 psi, 700L

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3
Q

Most common bulk tank? Pressure and volume?

A

H tank

2,000 psi, 7,000L

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4
Q

Name the cylinder color for:

1) Oxygen
2) NO
3) Nitrogen
4) medical-grade air

A

1) green
2) blue
3) black
4) yellow

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5
Q

Which safety system prevents hooking up a PORTABLE tank to the incorrect yoke?

A

Pin index safety system

each type of gas tank has holes in unique locations that align with pins on the corresponding gas line

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6
Q

Working pressure entering into the anesthesia machine?

A

45-50 psi

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7
Q

2 mechanisms that can be present on WALL OUTLETS to prevent hooking up supply lines to the wrong source?

A

Diameter Index Safety System

Quick connect

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8
Q

How does activation of the oxygen flush valve affect anesthetic concentrations in the system?

A

Decreases (dilutes) them

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9
Q

Which part of the anesthesia machine enables the liquid anesthetic to become a vapor and mix with oxygen?

A

Anesthesia vaporizer

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10
Q

Common outflow for the vaporizer and oxygen flush?

A

fresh gas outlet

this is also where the breathing circuit connects

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11
Q

4 classifications of breathing circuits?

A

1) open
2) semi-open (non-rebreathing)
3) semi-closed (circle)
4) closed (circle)

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12
Q

4 advantages of non-rebreathing over circle system

A

1) low resistance
2) simple (low failure)
3) no distance limitations
4) immediate control of inspired concentration

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13
Q

Main difference between semi-closed and closed circuit?

A

in semi-closed, FGF exceeds patient’s metabolic requirement

Closed only supplies enough to meet patient’s metabolic needs

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14
Q

Purpose of Sodasorb and what are the by-products of its interaction with CO2?

A

Sodasorb scavenges CO2 from expired gas

produces water and heat

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15
Q

2 purposes of APL (pop-off) valve?

A

1) vents excess gas from circuit

2) close to provide patient with manual ventilation

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16
Q

This structure of an ET tube provides a secondary airway should the primary lumen become occluded

A

Murphy eye

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17
Q

T/F: The cuff on an ET tube will eliminate the risk of aspiration entirely

A

False

*cuff mainly serves to reduce leaks for positive pressure ventilation

18
Q

Name two advantages of ISO over SEVO

A

Iso is more potent and costs less

COST= PRIMARY advantage

19
Q

Name one advantage of SEVO over ISO

A

It’s less soluble (works faster)

Less soluble= good; less will go to blood and other tissues…more to brain!

20
Q

Both SEVO & ISO are administered as _____

21
Q

Vapor pressure denotes the ability of a substance to ______

A

evaporate

higher vapor pressure=more likely to evaporate

22
Q

In a mixture of gases, the pressure exerted by one gas if it occupied the space alone?

A

Partial pressure

23
Q

How to calculate partial pressure?

A

multiple the % of the gas of interest by the atmospheric pressure

24
Q

Clinically useful way to record the amount of inhalant being administered to a patient?

A

Volume percent

25
Blood: gas PC determines?
induction and recovery *lower PC= less soluble (less molecules in blood)= faster induction & recovery
26
Oil:gas PC determines?
Potency **cannot determine induction speed using this**
27
Time constant = ?
Volume(L)/ flow (L/min) *time it takes to fill a container*
28
% of changes after: 1 time constant? 4 time constants?
after 1: 63% changed after 4: 98% changed
29
Rank order of distribution of inhalants to the 4 different tissue groups (most saturated to least)
vessel rich (brain & viscera) muscle fat vessel poor (cartilage, bone)
30
Name 2 factors that influence alveolar concentration?
1) concentration of inhaled anesthetic | 2) alveolar ventilation (depth of breath)
31
What measurable variable reflects the partial pressure of an inhalant present in the brain?
expired volume percent
32
3 disadvantages of an oxygen concentrator?
1) requires electricity to work 2) doesn't deliver pure oxygen 3) doesn't use pressurized gas (can't use ventilator)
33
The flowmeter is measured in ______ and it's normal range is ?
L/min 0.2-5L/min
34
4 purposes of the breathing circuit
1) deliver gas mixture to patient 2) remove CO2 from patient 3) secure airway 4) provide ventilation
35
4 disadvantages of non-rebreathing compared to circle system
1) high FGF rate ($$) 2) loss of heat and moisture 3) environmental pollution 4) harder to control manual ventilation if needed
36
Two purposes of reservoir bag?
1) provides excess capacity to build between breaths | 2) used for manual ventilation
37
4 advantages of circle system over non-rebreathing
1) lower FGF (cheaper) 2) preserves heat and moisture 3) less pollution 4) easier to provide mechanical ventilation
38
4 disadvantages of circle vs. nonrebreathing
1) higher resistance 2) complex (higher failure rate) 3) constrained distance 4) takes time to equilibrate circuit to new concentration
39
3 advantages and disadvantages of closed over semi-closed
A: 1) conserves gas 2) preserves heat and moisture 3) no pollution D: 1) longer equilibration (hrs) 2) accuracy of vaporizer 3) tricky monitoring
40
Disadvantages of inhalant anesthetics (3)
narrow therapeutic index expensive initial investment doesn't block nociceptive input
41
3 factors that affect arterial concentration of inhaled anesthetics
1) blood:gas partition coefficient 2) cardiac output (CO) (higher=slower induction) 3) arterial-venous concentration difference (larger difference drives things to arterial side & we don't want that... so larger difference=slower induction)