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Principles of Anesthesia I 2024 > Exam 1 Spinal & Epidural Neuraxial Anesthesia [5/30/24] > Flashcards

Exam 1 Spinal & Epidural Neuraxial Anesthesia [5/30/24] Flashcards

1
Q

What is the order of the meningeal layers from outter to inner?

A
  • Dura Mater:The outer most layer.
  • Arachnoid Mater:The middle layer.
  • Pia Mater:The inner most layer that directly covers the SC.

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2
Q

Spinal Anesthesia is also called?

A
  • Subarachnoid block
  • Intrathecal

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3
Q

List the 3 key spaces discussed in class.

A
  1. Epidural space
  2. Subdural space
  3. Subarachnoid space

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4
Q

Where is the epidural space?
What does it contain?

A
  • Located outside/before the dura mater.
  • Contains fat and small blood vessels (epidural veins).

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5
Q

What is the subdural space?

A
  • A potential space between the dura mater and the arachnoid mater.

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6
Q

Where is the subarachnoid space located?
What does it contain?

A
  • Between the arachnoid mater and the pia mater.
  • Filled with cerebrospinal fluid (CSF), which cushions and protects the spinal cord
  • This is where we want the tip of the needle for spinal anesthesia.

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7
Q

What 2 things might happen if the subdural space is hit?

A
  1. if its spinal it wont work
  2. if its epidural, will have high spinal block.

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8
Q

The epidural space is located around the spinal cord and has
specific boundaries defined by spinal structures. What are the boundaries of the Epidural Space?

A
  • Cranial Border: At the top,near the base of the skull (foramen magnum).
  • Caudal Border:At the bottom,near the ligament connected to the coccyx (sacrococcygeal ligament).
  • Anterior Border:In front,lined by the posterior longitudinal ligament along the vertebrae.
  • Lateral Borders:On the sides,marked by the bony projections of the vertebrae (vertebral pedicles).
  • Posterior Borders:At the back,framed by ligamentum flavum and the bony plates of the vertebrae (vertebral lamina).

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9
Q

Where does the epidural space start and end?
Clinical relevance?

A
  • Starts: Foramen mangum
  • Ends: S5
  • Wide range you can cover meaning we can administer the epidural anesthesia from foramen magnum to S5 . Can do epidural anesthesia in thoracic, lumbar, caudal.

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10
Q
  1. what is in front of the epidural space?
  2. what is the posterior border of epidural space?
A
  1. Posterior ligament
    1. then we have the body of the vertebra and then the anterior ligament.
    2. the anterior portion of the epidural space is one of the ligaments that we dont want to touch [this is the posterior ligament]
  2. Ligamentum flavum.

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11
Q

List the contents of the epidural space

A

Contains nerves, fatty tissue,lymphatics,and blood vessels.

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12
Q

What is the role of the contents of the epidural space?

A
  • Aids in drug absorption.
  • Fatty tissue in this area can absorb and decrease the availability of certain drug
  • Ex: bupivacaine is absorbed more than lidocaine or fentanyl or morphine

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13
Q
  • Epidural vein is also called?
  • What are the characteristics of the epidural vein?
A
  • Batson’s Plexus
  • Valveless and form a plexus draining blood from the cord and its linings
  • Density of veins increases laterally
  • Engorged under conditions like obesity or pregnancy, increasing the risk during needle procedures in this area.

S32

If getting blood, then you are injecting laterally and not midline!

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14
Q

Plica Mediana Dorsalis

  1. Plica Mediana Dorsalis is for spinals or epidurals?
  2. What is it?
  3. What is its impact?
A
  1. Epidurals only.
  2. Thought to be a band of connective tissue located between the ligamentum flavum and the dura mater
  3. If it exists, it might act as a barrier within the epidural space which could affect how medications spread when injected into the epidural space.
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15
Q

What is the clinical relevance of Plica Mediana Dorsalis

A
  • Catheter Insertion: The plica mediana dorsalis is sometimes considered a possible reason for complications in placing an epidural catheter.
  • Unilateral Blocks: It might also play a role in cases where an epidural does not equally affect both sides of the body.

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16
Q

How much catheter should be left in the epidural space?

A

3-5cm

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17
Q

If giving sufentanyl to a laboring mother, take caution becuase?

A

It travels and crosses the placenta resulting in low APGAR scores.

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18
Q

What can we do for one sided blocks?

A
  • Positioning
  • Pull the catheter out a little. Be cautious that the catheter is still in the epidural space.
  • Pull out and start over again.
  • Talk to the pts about this in informed consent.

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19
Q

Subarachnoid Space

Where is the subarachnoid space?
What does it contain?

A
  • Located deep to the arachnoid mater| in between arachnoid and pia mater.
  • Contains cerebrospinal fluid (CSF), nerve roots, and the spinal cord itself.

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20
Q

This space is the primary target when performing a spinal anesthetic procedure

A

Subarachnoid Space

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21
Q

If the needle is advanced too far anteriorly when doing spinals what are possible layers that are passed

A
  • pia mater
  • spinal cord
  • the posterior longitudinal ligament before reaching bone.

S34

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22
Q

What are the characteristic Sensation when performing a spinal anesthesia.

A
  • During spinal anesthesia, a characteristic “pop” is often felt when the needle passes through the outer membrane, the dura mater.
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23
Q

The subdural space is a ____ located b/w which 2 layers around the spinal cord?

A

Potential space
dura mater (outer layer) and arachnoid mater (middle layer)

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24
Q

If we accidentally place an epidural in the subdural space what would the clinical effect be?

A

“high spinal” effect meaning the medication affects a larger area than intended

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25
Q

If we inadvertently place a spinal dose in the subdural space what would the result be?

A

failed spinal block
(it wont work!!!)

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26
Q

List the meningeal layers from outermost to innermost

A

Dura mater (1st layer/outer layer)
Arachnoid mater (2nd/middle layer)
Pia Mater (3rd/inner layer)

S36

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27
Q

T/F
The Dura mater extends from the magnum foramen to L3

A

False
It extends from the foramen magnum to the dural sac (which ends at S2 in adults and S3 in infants)

S36

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28
Q

Which layer of meninges is the 1st layer encountered by the needle after advancnig through the epidural space?

A

Dura Mater

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29
Q

What type of tissue makes up the arachonid mater?

A

connective tissue

S36

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30
Q

T/F
the pia mater lacks vasculature

A

FALSE!
The pia mater is HIGHLY vascular

S36

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31
Q

Where is the pia mater located?
Should the spinal needle punture this layer of meninges?

A

this innermost layer directly covers the spinal cord
NO!! it should NEVER be punctured as it is directly attached to the surface of the spinal cord

S36

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32
Q

How mant spinal nerves do we have total? at each level of the spinal cord?

A

31 spinal nerves!
C-8
T-12
L-5
S-5
Coccyx-1

S37

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33
Q

Which of the cervical spine nerves is an exception in terms of where it exits the vertebra?

A

C8 nerve exits BELOW C7 whereas all other cervical spine nerves exit above the vertebra they are named for.

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34
Q

Where do the spinal nerves exit for thoracic, lumbar, sacral, and coccyx nerves?

A

below the vertebra they are named for

S37

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35
Q

Each spinal nerve is formed by the joining of what?

A

2 nerve roots:
Anterior/ventral nerve root (which carries motor and autonomic information from the SC to the body)
and
Posterior/dorsal nerve root (which carries sensory information from the body to the SC)

S37

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36
Q

What is a dermatome?

A

An area of skin that receives sensory nerves from a single spinal nerve root

S38

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37
Q

T/F
While a dermatome may physically appear to align w/ a certain part of the spine, it is actually connected to a different spinal nerve root

A

TRUE

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38
Q

The umbilicus looks like it should be served by the ____ nerve, but its actually served by ____

A

L3
T10 (actual)

S38

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39
Q

L1,2,3,4 dermatomes cover

A

anterior and inner surface of the lower limbs

S39

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40
Q

L4,5 S1 dermatomes cover

A

foot

S39

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41
Q

L4 dermatome covers

A

medial side of great toe

S39

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42
Q

S1,2 L5 dermatome covers

A

posterior and outer surface of lower limbs

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43
Q

S1 dermatome covers

A

Lateral margin of foot and little toe

S39

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44
Q

S2,3,4 dermatome covers

A

Perineum

S39

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45
Q

T10 dermatome covers

A

Umbilicus

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46
Q

T12 dermatome covers

A

Inguinal or groin regions

S39

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47
Q

C5 dermatome covers

A

Clavicles

S39

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48
Q

C5,6,7 dermatomes cover

A

lateral parts of upper limbs

S39

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49
Q

C8, T1 dermatomes cover

A

Medial sides of upper limbs

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50
Q

C6 dermatome covers

A

Thumb

S39

51
Q

C6,7,8 dermatomes cover

A

Hand

S39

52
Q

C8 dermatome covers

A

Ring and little fingers

S39

53
Q

T4 dermatome covers

A

Nipples

S39

54
Q

T/F
Sensory information from the face is not conducted by spinal nerves

A

True!

S40

55
Q

Which Nerve transmits facial sensations? What are its branches?

A

Trigeminal Nerve (CNV)
V1- opthalmic [forehead scalp, and upper eyelids]
V2- maxillary [lower eyelids, cheeks, nostrils, upper lip, upper teeth]
V3- mandibular [lower jaw, lower teeth, lower lip, and part of tongue]

S40

56
Q

Chart of branches of the trigeminal nerve with course and function

A

S40

He did not address this chart as much as he did previous information on the same slide

57
Q

what is the dermatone for peri-anal/anal surgery aka saddle block?

A

S2-S5

slide 41

58
Q

what is the dermatone for foot/ankle surgery?

A

L2

slide 41

59
Q

what is the dermatone for thigh/lower leg/knee surgery?

A

L1

slide 41

60
Q

what is the dermatone for vaginal delivery/uterine/hip procedure/ tourniquet/ TURP?

A

T10

slide 41

61
Q

what is the dermatone for scrotum surgery?

A

S3

slide 41

62
Q

what is the dermatone for penis surgery?

A

S2

slide 41

63
Q

what is the dermatone for testicular procdures?

A

T8
testicles are embryonically derived from the same lavel as the kidneys for pain transmission [T10-L1]

slide 41

64
Q

what is the dermatone for urologic/gynecologic/lower abdominal surgery?

A

T6

sliide 41

65
Q

what is the dermatone for ceseran section/upper abdominal surgery?

A

T4
sometimes may require concomitant genreral anesthesia d/t vagal stimulation form abdominal traction

slide 41

66
Q

For Spinals:
* location
* target

A
  • Location: Subarachnoid space of the spinal cord.
  • Target: LA acts on the myelinated preganglionic fibers of the spinal nerve roots
  • Also, inhibits neural transmission in the superficial layers of the spinal cord.

slide 43

67
Q

For Epidurals:
* Location
* Process

A
  • Location: In the epidural space outside the dura mater.
  • Process:
    * Diffusion: LA diffuse through the dural cuff to reach nerve roots.
    * Leakage: LA can leak through the intervertebral foramen into the paravertebral area (highlighted in green).

slide 43

68
Q

What neuraxial is this:
The spread of local anesthetic in the spinal or epidural space determines the block height.

A

Spinal

slide 44

69
Q

what are controllable factors that affect the spread of spinals?

A
  • Baricity
  • Patient Position
  • Dose
  • Site of Injection

Barry Plucked Dos Shallots

slide 44

70
Q

what are the non-controllable factors that affect the spread of spinals?

A
  • Volume of CSF
  • Increased Intra-abdominal Pressure (obesity,pregnancy)
  • Age (elderly)

slide 44

71
Q

what are the factors that dont affect the spread of spinals?

A
  • Barbotage (repeated aspiration and reinjection of CSF)
  • Speed of Injection
  • Orientation of Bevel
  • Addition of Vasoconstrictor
  • Gender

slide 44

72
Q

what are the key points to remeber for spinals?

A
  • dose is crucial
  • baracity matters
  • low csf volume
  • advanced age
  • pregnanacy

slide 44

73
Q

why is dosing crucial for spinals?

A

It’s the most reliable factor affecting how far and wide the anesthetic spreads when using a hypo- or isobaric solution.

slide 44

74
Q

why does baracity matter in spinals?

A

For hyperbaric solutions, the relative density of the anesthetic to CSF is crucial in determining how it spreads.

slide 44

75
Q

why does low CSF volume matter in spinals?

A

Low CSF volume correlates to extensive spread of LA in intrathecal space

slide 44

76
Q

why is advanced age important factor to consider with spinals?

A

With advanced age, neural nerves are vulnerable to LA and CSF volume decreases.

slide 44

77
Q

why is pregnancy an important factor to consider with spinals?

A

Decreased CSF volume due to increased intraabdominal pressure.

slide 44

78
Q

What neuraxial is this:
The spread of local anesthetic in the spinal or epidural space determines the block height.

A

epidural

slide 45

79
Q

what are controllable factors that significantly affect the spread of epidurals

A
  • Local Anesthetic Volume: Most important drug related factor
  • Level of injection: Most important procedure related factor
  • Local Anesthetic dose

slide 45

80
Q

what are non-controllable factors that significantly affect the spread of epidurals

A
  • Pregnancy
  • Old Age

slide 45

81
Q

what are controllable factors that have small affect on the spread of epidurals

A
  • Local Anesthetic Concentration
  • Patient Position

slide 45

82
Q

what are non-controllable factors that have small affect on the spread of epidurals

A

height (Taller or shorter stature may slightly affect spread)

slide 45

83
Q

what are controllable factors that have no affect on the spread of epidurals

A
  • Additives in the Anesthetic (Might change onset time or duration but not spread.)
  • Direction of the Bevel of the Needle
  • Speed of Injection

slide 45

84
Q

Injection Levels and Spread Dynamics:
* Lumbar Region:
* Mid Thoracic Region:
* Cervical Region:

A
  • Lumbar Region: mostly spreads cephalad.
  • Mid-Thoracic Region: Spread is balanced both cephalad and caudad.
  • Cervical Region: spreads caudad

slide 45

85
Q

what are the 3 nerve fiber types?

A

A fibers
B fibers
C fibers

slide 46

86
Q

what are the different subtypes of A fibers?

A
  • alpha
  • beta
  • gamma
  • delta

slide 46

87
Q

for A-alpha fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: heavy
  • function: skeletal muscle-motor | proprioception
  • diameter: 12-20
  • block onset: 4th

slide 46

88
Q

for A-beta fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: heavy
  • function: touch and pressure
  • diameter: 5-12
  • block onset: 4th

slide 46

89
Q

for A-gamma fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: medium
  • function: skeletal muscle tone
  • diameter: 3-6
  • block onset: third

slide 46

90
Q

for A-delta fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: medium
  • function: fast pain, temperature, touch
  • diameter: 2-5
  • block onset: 3rd

slide 46

91
Q

for B fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: light
  • function: preganglionic ANS fibers
  • diameter: 3
  • block onset: first

slide 46

92
Q

what are the 2 subtypes of C fibers?

A

sympathetic and dorsal root

slide 46

93
Q

for C-sympathetic fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: none
  • function: postganglionic ANS fibers
  • diameter: 0.3-1.3
  • block onset: second

slide 46

94
Q

for C-dorsal root fibers:
* mylenation
* function
* diameter
* block onset

A
  • mylenation: none
  • function: slow pain, temperature, touch
  • diameter: 0.4-1.2
  • block onset: second

slide 46

95
Q

Which nerve fiber has the largest diamerter and which one has the smallest?

A
  • largest: A-alpha
  • smallest: C fibers

slide 46

96
Q

how are the nerve fibers blocked? [first to last?]

A
  • 1st: B fibers
  • 2nd: C fibers
  • 3rd: A-gamma and A-delta
  • 4th: A-alpha and A-beta

slide 46

97
Q

what is differential blockade?

A

Differential blockade refers to how different types of nerve fibers have varying sensitivities to local anesthetics, affecting the level of block achieved.

slide 47

98
Q

what is sensory blockade?

A

Occurs at lower concentrations of LA, which do not affect motor neurons. This results in a higher block level compared to motor block.

slide 47

99
Q

what is autonomic blockade?

A

Requires even lower concentrations of LA, affecting neither sensory nor motor neurons, leading to the highest level of blockade.

slide 47

100
Q

what is the arrangement of nerves in a nerve bundle when introducing a local anesthetic?

A
  • B= autonomic preganglionic fibers ( venodilation-hypotension)
  • C= pain and temperature
  • A-delta = pain and temperature
  • A-gamma = motor tone
  • A- beta = touch and pressure
  • A - alpha = motor and proprioception

slide 47

101
Q

In the Differential Blockade Zones:
* The ____ is 2 levels higher than the motor level
* The sympathetic level is ___-___ levels higher than the sensory level

A
  • The Sensory level is 2 levels higher than the motor level
  • The sympathetic level is 2-6 levels higher than the sensory level

slide 48

102
Q
  • What two sensory aspects travel together?
  • which one should you test to see if your block is working?
A
  • temperature and pain travel together
  • use temperature like a cold spoon or alcohol swab to dtermine if your block is working

slide 48 talking

103
Q

Onset of nerve blockade sequence

A
  1. B-fibers: sympathetic
  2. C and A-delta = loss of pain and temperature
  3. A-gamma= loss of motor tone
    A-beta= loss of touch and pressure
    A-alpha= loss of motor function and proprioception

slide 49

104
Q

Offset of Nerve blockade sequence

A
  1. A-alpha, Beta, Gamma
  2. C and A-delta
  3. B fibers

slide 49

105
Q

Which nerve fibers are blocked the longest?

A

B fibers - they are the first on, and last off

question in lecture

106
Q

How to monitor Sensory block?

A
  • Temperature - this is the first sense to be blocked
  • Pain - second sense to be blocked, assessed using a pinprick
  • Touch/Pressure - last sense to be blocked, assessed with light touch

slide 50

107
Q

How to monitor Motor block? and what is this monitoring scale called?

A
  • Modified Bromage Scale
  • Scale levels:
    0: no motor block
    1: slight motor block - pt cannot raise leg, but can move knees and feet
    2: moderate motor block: cannot raise leg or move knee, but can move the feet
    3: complete motor block: cannot move lower extremities (legs, knees or feet)

slide 50

108
Q

The Modified Bromage Scale specifically evaluates what?

A

the function of lumbosacral nerves, which are the lower spine and sacral nerve areas, and does not assess movement above these regions.

Slide 50

109
Q

CV effects of neuraxial anesthesia: Preload

A

Preload will decrease because of sympathectomy (venous dilation which pools blood in periphery and decreases venous return)
T1-T4 block

slide 51

110
Q

CV effects of neuraxial anesthesia: Afterload
* how much does SVR decrease?

A

Afterload decreases - sympathectomy partially dialates the arterial circulation
* Healthy pts: SVR decreases by ~15%
* Elderly or cardiac pts: SVR can decrease up to ~25%

slide 51

111
Q

CV effects of neuraxial anesthesia: Cardiac Output

A

CO may initially increase then decrease overtime because of blood vessle dialation
* a decrease in venous return and SVR leads to reduced SV and CO

slide 51

112
Q

CV effects of neuraxial anesthesia: heart rate

A

Heart rate will decrease because of:
* blockade of cardiac accelerator fibers (T1-T4) blocks SNS tone
* Activation of reflexes: Benzold-Jarish Reflex, reverse bainbridge reflex

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113
Q

Bezold-Jarisch Reflex

A
  • Response to ventricular underfilling, potentially leading to a significant bradycardia and asystole.
  • Bezold-Jarisch Reflex is mediated by 5-HT3 receptors in the vagus nerve and ventricular myocardium
  • Ondansetron is a good 5HT3 recptor antagonist

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114
Q

Reverse Bainbridge reflex

A

Reverse Bainbridge Reflex: Triggered by reduced stretching of heart’s right atrium.

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115
Q

Sudden cardiac arrest: Unopposed ____ ____ to the cardioaccelerator fibers can result in profound bradycardia, hypotension, and sudden cardiac arrest.

A

Unopposed parasympathetic tone to the cardioaccelerator fibers can result in profound bradycardia, hypotension, and sudden cardiac arrest.

Slide 52

116
Q

What population is more likely to have this? and how often is sudden cardiac arrest after a neuraxial seen?

A
  • Can be seen young adults with high parasympathetic tone
  • 7:10,000 spinals
  • 1:10,000 epidurals

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117
Q

How long after a neuraxial block is given would you see a cardiac arrest? what are the arrests associated with?

A
  • 20-60 min after onset of spinal
  • Associated with large blood loss and orthopedic cement placement

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118
Q

Prevention of spinal-anesthesia induces HoTN: prevention with drugs (2 drugs)

A
  • Vasopressors: Medications like phenylephrine help maintain blood pressure by constricting blood vessels.
  • 5-HT3 Antagonists: Drugs like ondansetron can mitigate reflexes that cause hypotension, such as the Bezold-Jarisch reflex mediated by the vagus nerve.

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119
Q

Prevention of spinal-anesthesia induces HoTN: prevention fluid management

A
  • Co-loading: Administering intravenous fluids (around 15 mL/kg) right after the spinal block to prevent drops in blood pressure.
  • Avoid Preloading: Pre-block hydration is not routinely recommended due to minimal impact on preventing hypotension.
  • Avoid Excess Fluids: Excessive fluid can overload the circulatory system, especially in patients with heart problems.

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120
Q

Prevention of spinal-anesthesia induces HoTN: prevention with non-pharmachological means

A

Positioning: Adjusting the patient’s position, like slight pelvic tilting, to optimize blood flow and reduce risks.

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121
Q

Treatment of spinal-anesthesia induced HoTN: Drug treatment (2 categories)

A
  • Vasopressors: Such as ephedrine and epinephrine and phenelphrine are used based on the patient’s heart rate and symptoms. Ephedrine is preferred if there is symptomatic bradycardia.
  • Anticholinergics: Atropine may be used if the patient is experiencing bradycardia.

(according to Tito, atropine is rarely used because it lasts long after the procedure)

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122
Q

Treatment of spinal-anesthesia induced HoTN: volume

A

Fluids: Crystalloids or colloids to maintain adequate blood volume.
* safe to use crystalloid first then colloids later: concern with colloids cost, binds to drugs, and renal problems (increases blood viscosity and can lead to renal problems)

slide 54 and talking in lecture

123
Q

Treatment of spinal-anesthesia induced HoTN: position

A

Position Caution:
* Trendelenburg Position: This involves tilting the bed to increase venous return, but using a > 20-degree tilt can reduce cerebral perfusion because the tilt can reduce venous brain drainage. make sure we are not using a hyperbaric LA
* Position Influence on Block Effectiveness: If the block is not set yet, the block height can increase due to gravity

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Principles of Anesthesia I 2024 (4 decks)

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