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Anaesthesiology > Equipment > Flashcards

Equipment Flashcards

1
Q

What colour is oxygen pipe?

A

White

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2
Q

What colour is NO pipe?

A

Blue

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3
Q

What colour is air pipe?

A

Black

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4
Q

What colour is suction pipe?

A

Yellow

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5
Q

How should the ventilator RR be set for a healthy patient?

A

12

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6
Q

How should the ventilator tidal volume be set for a healthy patient?

A

6-8

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7
Q

What should the ventilator PEEP setting be for a healthy patient?

A

5
(4-10)

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8
Q

What should the ventilator peak inspiritory pressure setting be for a healthy patient?

A

<30 -32 cm H2O

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9
Q

What should the ventilator minute volume setting be for a healthy patient?

A

70-100 ml/kg
(Set according to production of CO2)

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10
Q

What should the ventilator inspiratory: expiratory ratio setting be for a healthy patient?

A

1:2

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11
Q

What should the ventilator plateau inspiratory pressure setting be for a healthy patient?

A

<25 -30 cm H2O

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12
Q

What should the ventilator endpoint sa02 (arterial hb saturation ) setting be for a healthy patient?

A

92-98

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13
Q

What should the ventilator endpoint Pa CO2 (arterial PCO2 in Pretoria) setting be for a healthy patient?

A

31-39

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14
Q

See picture 1 and describe capnogram

A

Normal end-tidal capnography waveform.

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15
Q

See picture 2 and describe capnogram

A

Crurare cleft: attempted inspiration during intubation. imply light level anaesthesia, muscle relaxant wearing off

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16
Q

See picture 3 and describe capnogram

A

“Shark fin” wave. Bronchospasm

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17
Q

See picture 4 and describe capnogram

A

Oesophageal intubation

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18
Q

See picture 5 and describe capnogram

A

Cardiac oscillations

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19
Q

See picture 6 and describe capnogram

A

Sudden decrease in cardiac output due to embolism of any substance in amounts that can obstruct right ventricular outflow (massive dead space ventilation) causes abrupt decrease in PET CO2. Also due to hypotension, cardiac arrest.

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20
Q

See picture 7 and describe capnogram

A

Increase in c02. Due to hypoventilation , increased production, hyper metabolic state. Eg due to sepsis, hyperthyroid, malignant hyperthermia

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21
Q

See picture 8 and describe capnogram

A

Baseline increasing. Sodalime exhausted or inspiratory/expiratory valves leaking

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22
Q

What can cause false reading on pulse oximeter? (7)

A

• Abnormal haemaglobin species eg methaemoglobin and carboxyhaemoglobin interfere with measurement of oxyhaemaglobin
• iv dyes eg methylene blue absorbs light at 660 nm and decreases spo2
• nail polish
• dark skin pigmentation may cause overestimation PAO2
• electromagnetic and electrocautery = artefacts
• ambient light = artefacts
• Movement = artefacts
• vasoconstriction: eg hypothermia = decreased amplitude
• low cardiac output

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23
Q

Advantages of circle system? ( 6 )

A

• Economical: less FGF and inhalation agent used
• pollution of theatre environment reduced (scavenging possible)
• inspired gases heated and humidified
• no rebreathing - absorb c02, sodalime
• use smaller diameter tubing to reduce dead space
• can measure inspiritory and expiratory gas concentrations
• best for maintenance

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24
Q

Label picture 9

A

A miller blade
B macintosh laryngoscope blade

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25
Q

Name 8 duties of anaesthestist during anaesthetic.

A

• Oxygenation status
• awareness prevention
• maintain correct plane of anaesthesia
• haemodynamic /respiratory monitoring and manipulation
• positioning
• ensure well-being perioperatively
• create optimal surgical conditions
• post-op pain management

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26
Q

Label picture 10

A

See picture 11

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27
Q

Name 4 functions of the anaesthetic machine

A

• provide oxygen
• accurately mix anaesthetic vapours and gases
• enable patient ventilation
• minimise risk patients and staff

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28
Q

Name 6 ways the anaesthetic machine prevents hypoxic mixture

A

• Oxygen analyser
• diameter index safety system
• pin index safety system
• international Color code
• proportional device - hypoxic guard
• oxygen Fail safe valve

Pressure gauge on cylinder and pipeline and will alert low pressure oxygen.

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29
Q

What colour is oxygen cylinder?

A

Black body, white shoulders

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30
Q

What colour is air cylinder?

A

Gray and black, white shoulders

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31
Q

What colour is carbon dioxide cylinder?

A

Green body, white shoulders

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32
Q

Name 4 components of the high pressure system of anaesthetic machine

A

Refers to cylinder and pipeline gas supply
. Check valve
• pressure regulator
• cylinder pressure indicator
• hanger yolk

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33
Q

Name 4 components of the intermediate pressure system of anaesthetic machine

A

Receive lower pressures
• pressure gauges (will alert to low oxygen pressure)
• common gas outlet
• oxygen flush
• oxygen pressure failure devices

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34
Q

Name 3 components of the low pressure system of anaesthetic machine

A

Pressure slightly above atmospheric. From flow control valves to gas outlet.
• flowmeters
• Vaporiser mounting device
• common gas outlet

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35
Q

Vaporizer function?

A

Convert liquid anaesthetic into Vapor and release controlled amount into fresh gas flow for maintenance of Anaesthesia eg sevoflurane

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36
Q

Name the 2 types breathing circuits and 2 main differences

A

• Rebreathing:mapleson a-f - high flows, flush out c02
• non-rebreathing: circle system - low or high flows, c02 absorber

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37
Q

Name 7 components of an anaesthetic circuit

A

•Efferent limb (from fresh gas outlet to patient, supply fresh gas )
• afferent (from patient) limb
• y-piece between efferent and afferent limbs
• volume of dead space (does not take part in c02 elimination)
• adjustable valve(s): heidbrink pressure release valve (rebreathing), airway pressure limiting apl valve or unidirectional ventilator valve. Allow venting of gas during spontaneous ventilation and determine gas flow direction during controlled ventilation.
• mechanism to eliminate CO2 from afferent limb (flow or chemical dependant)
• reservoir bag or ventilator.

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38
Q

Name functions of reservoir bag in anaesthetic circuit (3)

A

• allow for peak inspiritory flows during inspiration (up to 50 l/ min adults)
• assisted ventilation when valve partially closed
• give indication that patient is breathing, not if adequate

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39
Q

Name picture 12

A

Mapleson F breathing circuit

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40
Q

Name picture 13

A

Circle system non-rebreathing circuit

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41
Q

Name picture 14

A

Mapleson A breathing circuit

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42
Q

Name picture 15

A

Mapleson C breathing circuit

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43
Q

Name picture 16

A

Mapleson B breathing circuit

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44
Q

Name picture 17

A

Mapleson D breathing circuit

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45
Q

Name picture 18

A

Mapleson E breathing circuit

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46
Q

Describe mapleson A breathing circuit (inlet, valve, reservoir, tubing, other name) and use

A

• Fresh gas inlet near bag
• valve near patient
• reservoir bag present
• corrugated tubing present
• also called Magill
• used during spontaneous ventilation

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47
Q

Describe mapleson c breathing circuit (fresh gas inlet, valve, reservoir, tubing) and use (5)

A

• Fresh gas inlet near patient
• valve near patient
• reservoir bag present
• corrugated tubing absent
• not used in anaesthesia but similar to ambubag. Use when anaesthetic machine, piped gas or mechanical ventilator not available eg transport. Not for spontaneous ventilation. Used in emergency resus.

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48
Q

Describe mapleson D breathing circuit (inlet, valve, reservoir, tubing, alt name) and use

A

• Fresh gas inlet near patient
• valve away from patient
• reservoir bag present
• corrugated tubing present
• also called Bain circuit
• more efficient during controlled or manual ventilation. Spontaneous IPpV, general anaesthesia.

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49
Q

Describe mapleson E breathing circuit (inlet, valve, reservoir, tubing, alt name) and use

A

• Fresh gas inlet near patient
• valve away from patient
• reservoir bag absent
• corrugated tubing present
• also called Ayre’s t piece
• allow spontaneous breathing with addition of oxygen

50
Q

Describe mapleson F breathing circuit (inlet, valve, reservoir, tubing, alt name) and use (6)

A

• Fresh gas inlet near patient
• valve absent
• reservoir bag present
• corrugated tubing present
• also called Jackson Rees circuit
• used for vapour induction and emergence in children and babies up to 20kg because made of very light plastic and low dead space. Controlled and spontaneous ventilation possible

51
Q

What fgf needed for mapleson A?

A

Sv: 70-100 ml/kg/min (= to MV)
Ippv: min 3 X mv (but very high and difficult to predict)

52
Q

What fgf (fresh gas flow ) needed for mapleson c?

A

Ippv: min 15 lpm - 2xMV

53
Q

What fgf needed for mapleson d.

A

Sv: 150-200 ml/kg/min - 1-2x MV
Ippv: 70-100 ml/kg/min - 2-3 x MV

54
Q

What fgf needed for mapleson f?

A

2,5-3 X mv (high)
Min 4 lpm
For both Sv and IPPV

55
Q

What must be checked in machine checks? (7)

A

• gas supply
• back up oxygen cylinder
• flowmeters
• vaporizers
• oxygen flush
• ventilators
• circuit leaks

56
Q

Label picture 19 a

A

See picture 19 b

57
Q

What are the 5 things that need to be evaluated when interpreting capnography

A

•Is It present
• is baseline zero
• is alveolar plateau flat, value ideally 35-45
• Is petco2 rising with baseline zero
• Is petc02 decreasing over time

58
Q

Describe and diagnose picture 20

A

Sudden disconnection or extubation; loss circulatory function

59
Q

Describe and diagnose picture 21

A

Total obstruction eg lanyngospasm, kinking of ETT, or leak.

60
Q

Describe and diagnose picture 22

A

Rebreathing circuit, or sodalime exhausted

61
Q

Describe and diagnose picture 23

A

Tachypnoea

62
Q

Describe and diagnose picture 24

A

Late emptying of lung regions eg pregnancy, obese

63
Q

Describe and diagnose picture 25

A

Leak in system

64
Q

Describe and diagnose picture 26

A

Sudden decrease cardiac output

65
Q

Which graph shows the oximetry?

A

Plethysmogram

66
Q

When should spirometer be used?

A

When use pressure control ventilation

67
Q

Name 6 things spirometry indicates

A

• Tidal volume and rate (minute volume)
•Compliance
• airway resistance
• peak airway pressure
• plateau pressure

68
Q

Contraindication non-invasive bp monitoring?

A

Av fistula

69
Q

Name 4 indications invasive bp monitoring (arterial line)

A

• Sampling
• No NIBP
• fluid status
• pt risk with bp change
• large pressure and volume shifts occur
• renal function compromised

70
Q

Name 4 contraindications arterial line bp monitoring

A

• av fistula
• no collateral
• bleeding tendency
• site infection

71
Q

Name 3 complications arterial line bp monitoring

A

• ischaemia /thrombosis
. False aneurysm
• bleeding

72
Q

What does CvP represent? (What is it)

A

Interaction between blood volume, venous tone, right heart function.

73
Q

Normal CvP?

A

0-5 mm hg

74
Q

Name 4 indications CVP

A

• fluid status (trend)
• drugs (inotropes, TPN, kcl)
• No lines
• treat venous air embolism

75
Q

Name 4 complications CVP

A

• Structure injury
• failure/clotting
• Pneumothorax
• bleeding

76
Q

What does nmT monitor?

A

Neuromuscular transmission device
Extent of muscle paralysis

77
Q

Name 4 methods monitoring core temperature

A

• nasopharyngeal
• distal esophagus
• tympanic membrane
• pulmonary artery catheter: gold standard

78
Q

Name 3 methods monitor depth of anaesthesia

A

• EEG
• bispectoral index (bis)
• entropy (type EEG with less monitors)

79
Q

Target bispectral index value?

A

40-60 is adequate depth of anaesthesia.
100= awake, 0=n0 activity.

80
Q

Label picture 60

A

See picture 61 (circle system)

81
Q

Shape of nitrous oxide inlet?

A

Semi Circular

82
Q

Shape of suction inlet?

A

Square

83
Q

Shape of oxygen inlet?

A

Hexagonal

84
Q

Name 5 advantages mapleson F breathing circuit

A

• low resistance, light weight, valveless
• can feel lung compliance
• ability to assist ventilation
• low dead space
• partial rebreathing heats and humidifies gas
Much faster induction! Then can switch to circle

85
Q

Name 4 disadvantages mapleson F breathing circuit

A

• no scavenging, pollutes theatre
• need high fgf for sv, wasteful anaesthesia
• et c02 measurement inaccurate in < 10 kg
. Less efficient than circle

86
Q

What is HME filter?

A

Heat and moisture exchanger
Increase dead space and resistance to circuit
Prevent damage, maintain mucociliary function

87
Q

Name 10 items that must be available on the working area of the anaesthetic machine for airway management

A

Five metals
• laryngoscope
• Magill forceps
• stylet for tube
• artery forceps
• infusion stands

Five plastics
• face mask
• tracheal tube
• Guedel airway
• Airway filter
• suction tip

88
Q

Pressure in full oxygen cylinder?

A

4 bar

89
Q

Reaction of sodalime with CO2 produces what?

A

Heat and water

90
Q

Name 5 components of a scavenger system

A

•Collecting system: from apl valve and ventilator at machine outlet
• tubing to transfer gas : from collecting system to scavenger interface
• scavenger interface: open with a reservoir or closed without reservoir but with relief valve
• gas disposal tubing
• gas disposal assembly: active (vacuum) or passive

91
Q

Name 6 essential monitors intra-op

A

• Saturation
• capnogram
• non-invasive bp
• ECG
• temperature
• oxygen analysis
(Peripheral nerve stimulator)

92
Q

How does et co2 on capnogram and arterial co2 on blood gas correlate? Significance if deranged?

A

Indicate adequate ventilation when et co2 and a cop are more or less the same
Low et co2: hyperventilation if ac02 also low. If a c02 high, there’s a problem with getting adequate c02 to the lungs to be exhaled due to low bp or lung diffusion problem
High: hypoventilation

93
Q

Name 4 causes of no reading on capnogram

A

• Problem with monitor
• Misintubation
• complete disconnection or obstruction somewhere
• cardiac arrest

94
Q

Name 3 processes reflected by the capnogram

A

• Metabolism: production co2 from 02 consumption
• transport: to the lung (BP/ flow )
• ventilation:gas exchange by removal c02.

95
Q

Name 3 causes small wave form on pulse oximetry making the reading unreliable

A

• Vasoconstriction
• low cardiac output
• hypothermia

96
Q

When use bis monitor?

A

Tiva
Because can’t monitor depth of anaesthesia using MAC and other measures with volatiles

97
Q

Identify and describe pathology picture 75 as seen on arterial line.

A

See picture 76.
Swing- large difference in pulse pressure variation (difference between pulse pressures during positive pressure ventilation at inspiratory and expiratory times ) caused by change in preload eg dehydration

98
Q

How calculate pulse pressure variation on arterial line?

A

Ppmax-ppmin/ pp mean x 100/1

99
Q

What does a pulse pressure variation on arterial line of > 12% indicate during resus?

A

Will be fluid responsive so give fluid

100
Q

What does a pulse pressure variation on arterial line of < 8% indicate during resus?

A

Not fluid responsive so give inotropes (8-12 grey area)

101
Q

Name 3 disadvantage of the circle system

A

• Complex
• prone to leaks
• can’t be used outside of hospital (mapleson can)
Increase dead space x2

102
Q

Volume vs pressure control ventilation? (4)

A

• Favours control of ventilation to ensure required mv vs oxygenation
• need healthy alveoli vs used in severe obstructive and restrictive lung disease
• set tidal volume (6-8 ml/kg) vs inspiratory airway pressure ( 8-12 cm h2o)
• variable inspiratory pressure vs variable tidal volume (dependent on resp compliance)

103
Q

Name 3 advantages volume controlled ventilation

A

• Guaranteed tidal volume resulting in more stable minute volume.
• ventilator will alarm when inspiratory pressures too high >30
• initial flow rate lower than PCV so avoids high resistance related early pressure peak

104
Q

Name 3 disadvantages volume controlled ventilation

A

• Very high inspiratory pressures may cause barotrauma
• alveolar recruitment may be poorer in poor compliance lungs
• mean airway pressure lower, which decreases oxygenation

105
Q

Name 3 disadvantages pressure controlled ventilation

A

• Tidal volume may become very small if peak inspiratory pressures set too low, which causes hypercapnia
• obstruction in circuit or patient with decreased lung/chest wall compliance may go unnoticed → low tidal volume
• tidal volume may become very high in lungs with normal or high compliance → hypocapnia, volutrauma (overdistension)
• tidal volume variable and dependant on respiratory compliance

106
Q

Name 3 advantages pressure controlled ventilation

A

• Lungs protected from high pressures, preventing barotrauma
• increased duration alveolar recruitment (alveoli opened earlier and remain open longer)
• work of breathing and patient comfort better

107
Q

Name a condition where volume control ventilation is preferred

A

Traumatic brain injury: need tight paCo2 control with minute volume

108
Q

Name 5 condition where pressure control ventilation is preferred

A

• Paediatrics
• lung Bullae
• one - lung ventilation eg thoracotomy
• severe obstructive and restrictive lung disease where there is decreased compliance
• LMA and uncuffed tubes (leak in circuit)
• preumo or haemothorax

109
Q

Identify pathology picture 77

A

Decreasing et co2 due to:
• ETT cuff leak
•ETT in hypopharynx
• partial obstruction

110
Q

Identify picture 82

A

Oxygen

111
Q

Identify picture 83

A

Nitrous oxide

112
Q

Identify picture 84

A

Carbon dioxide

113
Q

Identify picture 85

A

Air

114
Q

Identify picture 86

A

Entonox (50 % nitrous 50% oxygen)

115
Q

Identify picture 86

A

Mapleson E / ayre t piece
See picture 87

116
Q

Identify picture 88

A

Mapleson d/bain
See picture 89

117
Q

Identify picture 90

A

Mapleson A / MaGill
See picture 91

118
Q

Identify picture 92

A

Circle system
See picture 93

119
Q

Identify picture 94

A

Oropharyngeal/ Guedel airway

120
Q

Identify picture 99

A

Nasopharyngeal airway

Anaesthesiology (24 decks)

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