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Principles II N517 > Spinal Anesthesia > Flashcards

Spinal Anesthesia Flashcards

1
Q

What is the most important thing to have before administering your spinal?

A

patent IV

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2
Q

What are two other important things to have (besides patent IV) before you administer your spinal?

A

suctionability to provide positive pressure ventilation

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3
Q

What is the order of anatomical structures traversed by a spinal needle?

A
  1. skin2. subcutaneous fat and tissue3. supraspinous ligament4. interspinous ligament5. ligamentum flavum6. epidural space7. dura8. subarachnoid space
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4
Q

What is the bottom of the spinal cord called?

A

conus medularis

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5
Q

What is the name of the ligament that goes from conus medularis to sacrum?

A

filum terminale

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6
Q

What is the dura mater?

A

outermost, tough fibrous tube that runs longitudinally from foramen magnum to S2-3

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7
Q

What is CSF supposed to look like?

A

clear and colorless

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8
Q

What is the function of CSF?

A

mechanical buffer to protect brain and spinal cord

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9
Q

How much CSF does the body produce per hour?

A

21 mL/hour or 500 mL/day

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10
Q

How much CSF is in an adult?

A

150 mL

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11
Q

How much CSF is in the subarachnoid space?

A

20-35 mL

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12
Q

What is the specific gravity of CSF?

A

1.003-1.009

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13
Q

What is the order of nerve fiber onset with a spinal?

A

BC and AdeltaAgammaAbetaAalpha

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14
Q

What are the most common interspaces for dural puncture?

A

L2-3 or L3-4

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15
Q

What are the two needle approaches?

A

midline and paramedian

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16
Q

What landmark helps you identify L4?

A

intercrestal line that runs between the iliac crests

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17
Q

What does hyperbaric mean?

A

LA solution is heavier than CSF, add glucose to LA

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18
Q

What does isobaric mean?

A

LA solution is same as CSF, mix LA with CSF

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19
Q

What does hypobaric mean?

A

LA solution is lighter than CSF, mix LA with sterile water

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20
Q

Where is spinal anesthesia thought to take place?

A

anterior and posterior nerve roots as they pass through the CSF on their way to the periphery

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21
Q

What is spinal anesthesia?

A

REVERSIBLE chemical blockade of neuronal transmission produced by the injection of a local anesthetic drug into the CSF contained within the subarachnoid space

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22
Q

What are some advantages of spinal anesthesia?

A
  • ideal technique for procedures involving the lower abd, pelvis/perineum and lower extremities- anesthetized patient can remain fully conscious or may be sedated- appropriate choice of agents can provide exceptional postoperative analgesia- when used with “light general” can be used for upper abd and thoracic cases- surgical stress reduced by afferent block and can speed patient’s recovery- reduces risk of venous thrombosis and overall blood loss by reducing arterial and venous pressure- small dose of local anesthetic required minimizes chance of systemic uptake
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23
Q

Can spinal anesthesia be used for a patient with a full stomach?

A

yes, but have plan B in case spinal fails

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24
Q

What postoperative complications does spinal anesthesia decrease the incidence of?

A

nausea/vomitingsedationcognitive impairmentwound pain

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25
Q

What is the #1 disadvantage of spinals?

A

sympathetic blockade that occurs virtually 100% of the time because it is relatively easy to block small autonomic fibers

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26
Q

What are some disadvantages of spinal anesthesia?

A
  • Intense motor blockade that can last longer than the procedure- post-dural puncture headache- urinary retention- “takes too long”
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27
Q

Spinal anesthesia is strongly advocated for with what pathophysiology?

A

pulmonary disease, although if pulmonary disease is really bad general may allow better gas exchange

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28
Q

What is a common fear of patients undergoing spinal anesthesia?

A

being “awake,” minimize their fear with your preoperative interview and reassure that pre and intra operative medications will be provided

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29
Q

What type of surgeries/indications would be ideal with spinal anesthesia?

A
  • major intra/abd procedures can be accomplished with high level T4 block-well managed SAB may be safer for the patient with a full stomach- urological procedures (TURP)- obstetrical procedures- minimal effect on metabolism (safer for liver disease, kidney disease, diabetes)- reduced systemic blood pressure may reduce risk of venous thrombosis and overall blood loss
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30
Q

What are absolute contraindications to spinals?

A
  • patient refusal- infection at injection site- coagulopathy or other bleeding diathesis- severe hypovolemia- severe aortic or mitral valve stenosis- increased ICP
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31
Q

What are relative contraindications to spinals?

A
  • uncooperative patient, psychiatric disease- septicemia/bacteremia- preexisting neurological deficit- chronic backache or headache- stenotic valvular lesions- severe spinal deformity
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32
Q

What are controversial issues with deciding whether or not to use spinal anesthesia?

A
  • prior back surgery- inability to communicate with the patient- complicated surgical procedures (long duration, major blood loss, respiratory compromise)
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33
Q

If a patient had an allergy to local anesthetics would you still do a spinal?

A

Yes, but use an amide local anesthetic

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34
Q

What would be some considerations with a spinal in a patient with untreated hypertension?

A

Could be volume depleted and have severe hypotension after spinal

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35
Q

What is important to remember about getting informed consent for a spinal?

A
  • they should understand the advantages and disadvantages of the procedure- SAB should be adequate for the procedure but you cannot guarantee it- indicate risks and potential complications- indicate the patient appears to understand and accept- give the patient time to ask questions- do not attempt to dissuade a patient who has been counseled and agreed to a general anesthetic- **Documentation does not exonerate you from acts of carelessness or negligence
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36
Q

What premeds/fluids can you give before giving a spinal?

A

versed for anxiety and amnesia, but do not oversedate the patientcan also adminiser 500-1500 mL of a balanced salt solution to help protect against hypotension

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37
Q

What supportive meds should you have ready when doing a spinal?

A
  • benzo or propofol- succ- atropine- ephedrine or phenyl
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38
Q

What monitors should be on the patient when doing a spinal?

A

EKGblood pressurepulse ox

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39
Q

How is the body of the thoracic vertebrae shaped?

A

heart shaped

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40
Q

How is the body of the lumbar vertebrae shaped?

A

kidney-shaped

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41
Q

What is the name of the space between the vertebrae you are trying to identify for needle placement?

A

laminar foramen

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42
Q

After you insert your needle and it feels “sandy” or “grainy,” what anatomical structure is your needle hitting?

A

lamina

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43
Q

Which vertebrae has spinous processes that are long and angulated downward?

A

thoracic vertebrae

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44
Q

Which vertebrae has spinous processes that are blunt and horizontal?

A

lumbar vertebrae

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45
Q

What is the most important thing that allows you to have a successful spinal?

A

proper position

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46
Q

What is the arachnoid mater?

A

middle layer, delicate, nonvascular and ends at S2

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47
Q

What is the pia mater?

A
  • delicate, highly vascular, and covers spinal cord- subarachnoid space lies between the pia and arachnoid mater (CSF found here)- holds blood supply that feeds spinal cord- do NOT want to puncture
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48
Q

Which nerve fiber is responsible for motor and proprioception?

A

A alpha

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49
Q

Describe the size and myelination for A alpha fibers.

A

heavy myelinationbig diameter (6-22 micrometers)

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50
Q

Which nerve fibers are responsible for motor, proprioception, touch and pressure?

A

A beta

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51
Q

Describe the size and myelination for A beta fibers?

A

moderate myelinationbig diameter (6-22 micrometers)

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52
Q

Which nerve fibers are responsible for muscle tone?

A

A gamma

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53
Q

Describe the myelination and size of A gamma fibers?

A

moderate myelination and medium sized at 4-6 micrometers

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54
Q

Which nerve fibers are responsible for pain, touch, and cold?

A

A delta

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55
Q

Describe the myelination and size of A delta fibers?

A

light myelination and smaller at 1-4 micrometers

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56
Q

Which nerve fibers are responsible for preganglionic sympathetic stimulation?

A

B fibers

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57
Q

Describe the size and myelination of B fibers.

A

light myelination and small at 0.5-2 micrometers

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58
Q

Which nerve fibers are responsible for pain, touch, warm, and cold?

A

C fibers

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59
Q

Describe the size and myelination of C fibers.

A

no myelinationvery small at 0.5-1.3 micrometers

60
Q

What positions can be used for a spinal?

A

lateral decubitussittingprone

61
Q

At what levels can a dural puncture be done?

A

any level between L2 and S1

62
Q

Before prepping and draping, what 4 things should you make sure you had before beginning?

A
  • patient IV- blood pressure cuff is on patient- resuscitation drugs and necessary equipment are available and in working order- inform the patient about what to expect throughout the procedure
63
Q

If someone is assisting you with the patient in the lateral decubitus position, where should you tell them to place their hands?

A

have them hold the back of the patients neck and the back of their legs to optimize their fetal position and keep the spine in proper alignment

64
Q

What can you NEVER injection into the CSF?

A

anything with preservatives

65
Q

What % tetracaine do you use for spinals?

A

0.5%

66
Q

What percent lidocaine do you use in spinals?

A

2% plain or 5% in 7.5% dextrose

67
Q

What percent bupivacaine do you use in spinals?

A

0.5%

68
Q

Tetracaine 0.5% in water would be have what kind of baricity?

A

hypobaric

69
Q

Tetracaine 0.5% in D5W would have what kind of baricity?

A

hyperbaric

70
Q

What type of solutions migrate to the most dependent areas of the spine?

A

hyperbaric

71
Q

What are four of the most important things that can influence your spinal level?

A
  • baricity- position of patient (during injection, immediately after injection)- drug dosage- site of injection
72
Q

What are other factors that can influence your spinal level?

A
  • age- CSF volume (inverse correlation)- curvature of spine (abnormal curves)- drug volume- intra-abdominal pressure- needle direction- patient height- pregnancy
73
Q

What type of technique should you use to put in a spinal?

A

aseptic

74
Q

What is important to do when injecting local anesthetic to be used for the skin wheal?

A

make sure you are not injecting the wrong solution; double check which solution is for the skin and which is for the CSF

75
Q

What type of syringe and needle should you use to make an intradermal wheal of local anesthetic?

A

3 mL syringe and 25 or 27 gauge needle

76
Q

Where should you insert the spinal needle if using a 25 gauge or smaller needle?

A

place an “introducer” needle through the skin wheal in the midline of the lower third of the interspace

77
Q

What causes you to feel the 2 “pops” as you advance your needle?

A

penetration of the ligamentum flavum (epidural space) and the dura/arachnoid membranes (subarachnoid space)

78
Q

Once you feel your 2nd pop and you know you are in the subarachnoid space, what should you do?

A

remove the stylet and observe the inside of the needle hub for return of clear CSF

79
Q

Once you know you passed through the dura and are in the subarachnoid space because you see clear CSF, you attach the syringe with the local anesthetic to the hub and then what should you do?

A

turn the syringe gently (90 degrees) and secure it to the needle, aspirate small volume of CSF to confirm that your needle tip is still in the subarachnoid space

80
Q

When aspirating CSF into a syringe that is already filled with clear local anesthetic, how do you know that you are aspirating CSF?

A

it will have a distinct swirl because CSF has a less dense specific gravity

81
Q

If you want a bilateral block, what should you do after removing the needle and introducer?

A

return the patient to the supine position immediately and elevate the patient’s head

82
Q

If you want a unilateral block, what should you do after removing the needle and introducer?

A

leave the patient in the lateral position for at least 3 minutes then return them to a supine position and elevate the patient’s head

83
Q

What are the 3 needle types?

A

QuinckeWhitacreSprotte

84
Q

If your needle is touching the superior crest of the spinous process below the interspace, where should you direct the needle?

A

more cephalad

85
Q

If your needle is touching the inferior surface of the spinous process above the interspace, where should you redirect your needle?

A

more caudad

86
Q

If your needle is repeatedly striking bone, what should you do?

A

needle is striking the lamina and is not midline, remove the needle and reassess landmarks and positioning

87
Q

What happens if you obtain CSF after placing the needle but your patient has paresthesias?

A
  • stop advancing the neelde- leave the needle and stylet in place- if the paresthesia resolves then continue with the injection- if the paresthesia does not resolve then remove and reposition the needle
88
Q

What happens if you patient has paresthesias and you have not confirmed placement with CSF?

A

likely extradural, remove and reposition the needle

89
Q

What if you are unable to obtain CSF?

A

reinsert the stylet and slowly advance the needle an additional 1 to 2 mm, attempt to aspirate CSF, repeat these steps until CSF is identified

90
Q

What is a good common practice to do after puncture of the dura?

A

insert the needle an additional 1 mm to ensure the needle bevel is entirely subarachnoid

91
Q

What happens if you have no CSF, no paresthesia, and have not hit bone?

A

may have traversed both the dorsal and anterior surfaces of the dura, remove the stylet and attach a small syringe, gently aspirate the syringe as you slowly withdraw the spinal needle, may get CSF as the needle tip is withdrawn into the subarachnoid space

92
Q

If you punctured both sides of the dura, what does the patient have an increased risk of?

A

PDPH

93
Q

What happens if you have frank blood in the CSF that does not clear?

A

needle tip is likely in an epidural vein so you would need to withdraw and reposition

94
Q

What happens if you have blood-tinged CSF?

A

allow CSF to flow for several seconds or aspirate until it clears, inject local anesthetic

95
Q

What two types of nerve fibers are we trying to block with a spinal?

A

Adelta and C fibers

96
Q

Is the drug concentration for spinals greater or less than the minimum concentration to block all nerve fiber types?

A

greater than minimum concentration

97
Q

Is the block of autonomic fibers (B) rapid or slow?

A

rapid

98
Q

What can occur with a block of autonomic (B) fibers?

A
  • hypotension - severity depends on the level of the block- T4 level blocks cardio-accelerator fibers and produces bradycardia- precipitous drop in BP may be first sign block is “setting up”- N/V with low BP
99
Q

What nerve fibers are affected next after B autonomic fibers?

A

A delta and C fibers (pain and temperature), loss of ability to discriminate temperature and light touch, level of temperature discrimination loss correlates well with level of sensory (pain) loss

100
Q

What nerve fibers are blocked next after A delta and C fibers?

A

A alpha, A beta, and A gamma (motor, proprioception, touch, and pressure) which causes surgical muscle relaxation and patient may continue to feel “pressure”

101
Q

How often do you have to check the progress of the block?

A

every 2-3 minutes

102
Q

What can you use to check the progress of the block and determine the dermatome level?

A

alcohol sponge or pinprick

103
Q

What should you monitor frequently after administering a spinal?

A
  • assess progress of the block- check blood pressure- assess cognitive function
104
Q

Are the degree of physiologic changes and extent of the CNS exposed to local anesthetic directly or indirectly related?

A

directly related

105
Q

What is one way to control to some degree the distribution or spread of the local anesthetic?

A

Adjusting the horizontal level of the OR table

106
Q

The upper limit of the autonomic block is generally ___ dermatomes higher than the level of the sensory block.

A

2

107
Q

The upper limit of the motor block is generally ___ dermatomes below the level of the sensory block.

A

2

108
Q

What is a saddle block?

A

S2 to S5, little effect on the autonomic nervous system, used for surgery on the perineum, perianal area and external genitalia

109
Q

What is a low spinal?

A

T10, blocks sacral nerves and the lower lumbar roots, used for cystoscopies, TURP, lower extremity vascular and orthopedic procedures not requiring a tourniquet, urethra, vagina, cervix, and vaginal delivery

110
Q

What is the most common level for a spinal?

A

T4, permits abdominal and lower extremity procedures (testicular procedures, inguinal herniorraphy, ureter and renal pelvic procedures, appendectomy, ovarian cystectomy, C-section, vaginal hysterectomy and lower extremity orthopedic procedures requiring a tourniquet)

111
Q

What is a high spinal?

A

C8, jargon for a block higher than T2

112
Q

What position would be optimal for an obese patient?

A

sitting position - provides better flexion of the vertebral column and adipose tissue is less likely to distort anatomical landmarks

113
Q

When would you want to use a paramedian (lateral) approach?

A

useful when the patient cannot flex the lumbar spine (prior lumbar spine surgery, rheumatoid arthritis, hip or upper leg trauma)

114
Q

What is the technique for a paramedian (lateral) approach?

A
  • skin wheal 1 cm lateral and 1 cm caudad to the spinous process above the selected interspace- advance the spinal needle medially and cephalad toward the midline (needle passes through the paraspinal muscles to the ligamentum flavum to the dura; avoids supraspinous and interspinous ligaments)
115
Q

What is the lumbosacral “taylor” approach?

A
  • modification of the paramedian approach- uses the largest opening tot he spinal canal L5-S1- identify the posterior superior iliac spine- make a skin wheal 1 cm medial and 1 cm caudad to the spine- insert the needle 45-55 degrees medial, cephalad and parallel to the dorsal surface of sacrum toward the midline of the lumbosacral foramen
116
Q

What is a continuous spinal?

A

ability to provide prolonged anesthesia and postoperative analgesia

117
Q

Who are continuous spinals usually used for and why?

A

elderly patients due to PDPH risk

118
Q

What needles do you use for a continuous spinal?

A
  • puncture the dura with a 17 gauge epidural needle and passage of a 19 to 20 gauge catheter through the needle into the subarachnoid space
119
Q

How do you administer local anesthetic for a continuous spinal?

A

small incremental doses of local anesthetic are given until the desired level is reached; incremental doses slow onset of hypotension and total dose to achieve a specific level same as for single injection

120
Q

Why would you add vasoconstrictors to your local anesthetic?

A

constricts blood vessels of the spinal cord and dura slowing absorption into the blood which will prolong the duration, and possibly the intensity of the LA

121
Q

What concentration and volume of epi would you add to your local anesthetic?

A

0.1-0.2 mL at 1:1000 solution

122
Q

Which LA does epi have the greatest effect with?

A

tetracaine

123
Q

How much phenyl do you add to LA?

A

0.05-0.2 mL of 1% solution (0.5-2 mg)

124
Q

Which LA does phenyl have the greatest effect with?

A

tetracaine

125
Q

What happens when clonidine is injected with LA?

A

has synergistic effect with LA

126
Q

When would it be useful to add clonidine to your LA?

A

when epi is contraindicated

127
Q

What are the common intrathecal opioids?

A

fentanylmorphinesufentanilmeperidine

128
Q

Why would you use opioids with LA?

A

provides better analgesia than with either drug alone

129
Q

What is the dose of fentanyl when mixing it with LA?

A

12.5-25 mcg mixed with LA

130
Q

What is the onset of intrathecal fentanyl?

A

5-10 minutes

131
Q

What is the duration of intrathecal fentanyl?

A

2-4 hours

132
Q

Is intrathecal fentanyl lipid soluble?

A

yes, binds to elements of the spinal cord and therefore has less drug available to diffuse to the respiratory centers

133
Q

Is morphine lipid soluble?

A

no, not bound to lipid elements in spinal cord and drifts freely in CSF

134
Q

Can morphine cause respiratory depression and if so, when?

A

yes, in approx 6-8 hours can drift as high as the respiratory center

135
Q

What is the dose of intrathecal morphine?

A

0.25-0.5 mg mixed with LA

136
Q

What is the onset of intrathecal morphine?

A

60-90 minutes

137
Q

What is the duration of intrathecal morphine?

A

18-27 hours

138
Q

What are some complications of intrathecal morphine?

A

itching, urinary retention and delayed respiratory depression

139
Q

What are some complications of spinal anesthesia?

A

MANY complications…- hypotension- intercostal muscle paralysis- apnea/phrenic nerve paralysis- paresthesias- subarachnoid or epidural hematoma- meningitis/epidural abscess- aseptic (chemical) meningitis- cauda equina syndrome- new nervous system lesion- exacerbation of preexisting neurologic disease- N/V- urinary retention- post dural puncture headache

140
Q

What concentration of bupivacaine is commonly used?

A

0.75% in dextrose

141
Q

What dose of bupivacaine 0.75% would you use for surgery on the perineum or lower limbs?

A

4-10 mg

142
Q

What dose of 0.75% would you use for surgeries on the lower abdomen?

A

12-14 mg

143
Q

What dose of 0.75% bupivacaine would you use for surgeries on the upper abdomen?

A

12-18 mg

144
Q

How long will bupivacaine last without epi?

A

90-120 minutes

145
Q

How long will bupivacaine last with epi?

A

100-150 minutes

146
Q

What things should you include in the anesthesia record after administering a spinal?

A
  • monitors applied- NC oxygen- position- betadine prep and sterile drape- L3-4 identified- skin wheal with 2 mL of 1% lidocaine- 18 G introducer placed midline at L3-4 interspace- 24 G sprotte needle x # of passes, (+) CSF, (-) parathesia (-) blood- cc’s of local anesthetic injected after (+) swirl- patient placed supine (or kept in sitting if doing saddle block)- final level

Principles II N517 (7 decks)

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