Locoregional Anesthesia Flashcards
What are the types of Local Anesthesia?
Topical
SQ/Line block
Wound soaker
What are specific blocks for locoregional anesthesia?
Head
Thoracic limb
Pelvic limb
Thorax
What are some Topical Anesthesias?
EMLA cream
Lidoderm
Ophthalmic: Tetracaine or proparacaine
Laryngeal: Lidocaine for intubation in cats
What anesthetic is used for Intubation in cats?
Lidocaine
When is subcutaneous anesthesia used?
Utilized for wounds, masses, skin biopsy
When is a wound soaker catheter placed?
Total ear canal ablation
Oncologic surgery
Large wound closure
What are the complications of a wound soaker catheter?
Catheter dislodgement
disconnection
Local anesthetic toxicity
Delayed wound healing
What are the advantages of a wound soaker catheter?
technically simple
consistent and prolonged analgesia
decreased need for systemic analgesics
What are the peripheral nerve blocks?
Plexus
Intercostal
Paravertebral
What are the central/neuraxial nerve blocks?
Epidural
Spinal
“Bier Block”
Intravenous regional anesthesia (IVRA)
IVRA
Intravenous regional anesthesia
When is the Bier Block indicated?
Distal extremity
Procedure that is less than 60-90 mins
What are the advantages of the Bier Block?
Simple and reliable
Minimal blood loss/clear surgical field
What are the IVRA complications?
Tourniquet pain Ischemia/nerve injury Limb swelling Hematoma Local anesthesia toxicity
What are the peripheral nerve blocks of the head?
Retrobulbar block Maxillary block Infraorbital block Inferior alveolar block Mental block
What are the indication for the retrobulbar block?
Enucleation
Evisceration/prothesis
Intraocular surgery
What are the nerve affected by the Retrobulbar block?
CN II CN III CN IV CN V CN VI Ciliary ganglion (parasympathetic)
What are the advantages of the Retrobulbar block?
Post-op analgesia
Globe immobility during surgery
Decreased anesthetic and NMBD requirements
What are the complications of the Retrobulbar block?
Retrobulbar hemorrhage Damage to optic nerve, extraocular mm. Globe penetration Intravascular injection Intrathecal injection (into optic nerve/ subarachnoid space)
What are the four dental blocks?
Infraorbital foramen
Middle Mental foramen
Vascular notch (mandible)
zygomatic arch
What nerve does the Maxilllary nerve block?
Sensory branch of CN V
What does the Maxillary nerve block provide anesthesia for?
Maxilla
teeth
soft tissues
Lateral aspect of nasal mucosa
What are the three techniques/approaches to the maxillary nerve block?
Subzygomatic
Maxillary tuberosity
Infraorbital
What does the
Infraorbital nerve block supply anesthesia to?
3rd premolar and teeth rostral
Rostral Maxilla
Soft tissues
What does the
Inferior alveolar nerve block supply anesthesia to?
Mandibular teeth
Rostral lower lip
Intermandibular space
What does the Mental nerve block supply anesthesia to?
Rostral lower lip
What are the Peripheral nerve blocks of the thoracic limb?
Cervical paravertebral block
Brachial plexus block
RUMM block
“declaw” block - Distal, radial, ulnar, median
What does the cervical paravertebral nerve block supply anesthesia to?
Entire thoracic limb including scapular and shoulder joint
What does the Brachial Plexus nerve block supply anesthesia to?
Distal to and including the elbow
What nerves are blocked with the Brachial plexus nerve block?
C6 - suprascapular
C7 - Musculocutaneous
C8 - Radial
T1 - median and ulnar
What does the
RUMM Block supply anesthesia to?
Distal thoracic limb
What nerves are blocked by the RUMM block?
Radial
Ulnar
Median
Musculocutaneous
What anesthetic is used in a declaw?
Bupivacaine
What are the Peripheral nerve blocks for the pelvic limb?
Femoral nerve
Sciatic nerve
What nerve block is used for Thoracotomys or rib fractures?
Intercostal nerve block
What is the positioning for an epidural?
Sternal recumbency
What is the concern for using a higher volume of drug in an epidural?
sympathetic blockade and hypotension
What is the most common local anesthetic + opioid combo?
Bupivacaine + Morphine
Where does Morphine L-S epidural provide analgesia?
Thoracic wall
Thoracic limbs
What does the Auriculopalpebral nerve block cause?
Paralysis of orbicularis oculi mm.
What is the common use for a Supraorbital nerve block in equine?
Placement of sub-palpebral lavage catheter
What nerve block is used for standing enucleation in equine?
Retrobulbar block
What blocks are used for equine dentals?
Infraorbital nerve block
Mental nerve block
Inferior alveolar nerve block
What are the uses for a caudal epidural?
Control of rectal tenesmus
Correction of uterine torsion, fetotomy, obstetric manipulations
Tail amputation, rectovaginal fistula repairs, Caslick’s procedure
Hind limb procedures and pain
Where do you place an epidural in an equine?
First coccygeal space (Co1-Co2)
What drug is used for equine epidurals?
2% Lidocaine
What are the alpha 2 agonists used with equine epidural?
Xylazine
Detomidine
What is the common drug combinationfor equine epidural?
Detomidine + Morphine
When is intra-articular morphine used?
analgesia post-arthroscopy
What does the Peterson block block?
Oculomotor
trochlear
abducens
3 branches of trigeminal
What do you block for dehorning in cattle?
Cornual branch of zygomaticotemporal nerve
What do you block for dehorning in goats?
Cornual brainch of zygomaticotemporal nerve
cornual branch of infratrochlear nerve
What are the two blocks for Regional Ruminant flank laparotomy?
Proximal paravertebral
Distal paravertebral
What are the two blocks for Infiltration ruminant flank laparotomy?
Line Block
Inverted L block
What region does the proximal paravertebral thoracolumbar anesthetize?
Dorsal and ventral branches of T13, L1, L2 spinall nerves
What are the signs of the proximal paravertebral thoracolumbar blockade?
Absent reaction to pinprick
Increased skin temperature due to vasodilation
Spinal scoliosis towards desensitized side due to paralysis of paravertebral mm.
What are the advantages of the proximal paravertebral thoracolumber block?
No disruption of incision site
Faster than line blocks
What are the disadvantages of the proximal paravertebral thoracolumber block?
Technical difficulty
Scoliosis may cause difficulty closing incision
Risk of penetrating great vessels
Loss of motor control if LA migrates to femoral nerves
What are the advantages of the distal paravertebral thoracolumber block?
Lack of scoliosis
Less risk of penetrating major blood vessels
What are the disadvantages of the distal paravertebral thoracolumber block?
Larger amount of local anesthetic vessels
May be less effective
What animals do you use the Lumbosacral epidural on?
Immature cattle
small ruminants
camelids
pigs
Where do you place the Lumbosacral epidural?
L6-S1 space
What drugs are commonly used with Lumbosacral epidurals?
Alpha 2 agonists
What are the blocks used in teats?
Ring block
Inverted V block
Teat cistern infusion
IV regional anesthesia of the teat
What blocks are used for the cranial aspect of udder and teats?
Paravertebral block of L1, L2, and L3
High caudal epidural
What are the blocks used for the foot?
Ring block
IVRA
What drug is used for testicular blocks for castration?
Lidocaine