Lameness in Horses Additional Concepts Flashcards

1
Q

What is the onset and duration of lidocaine?

A

Onset: Rapid
Duration: 1.5-3 Hours

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2
Q

What is the onset and duration of Mepivicaine?

A

Onset: Rapid
Duration: 2-3hrs

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3
Q

What is the onset and duration of Bupivicaine?

A

Intermediate Onset
Duration: 3-6hrs

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4
Q

What are sources of articular pain?

A

Synovium, joint capsule, articular/periarticular ligaments, periosteum, subchondral bone

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5
Q

What structure in a joint has no nerve endings and does not cause pain?

A

Cartilage

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6
Q

What is the correct order that you should perform nerve blocks?

A

Distal to proximal

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7
Q

How do you prepare a patient for a perinural nerve block versus an inteasynovial block?

A

Perineural: Clean, PI and alcohol scrub - brief, but thorough near synovial structures and never touch hub of needle

Intrasynovial: Clip, 5-minute sterile scrub, wear sterile gloves

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8
Q

What sized needles can be used for perineural blocks?

A

25g 5/8in - 18g 1.5inc

Smaller needle - less pain, more likely to break
Larger stronger
General 18G

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9
Q

What kind of syringe should you use?

A

Non-lock and leuer

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10
Q

How do you know if your patient has improved from your block?

A

Very subjective - use manipulation test and circles, aim for 100% improvement (may switch sides) and should achieve >70% improvement

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11
Q

What are some local side effects of perineural analgesia?

A

Local swelling - hematoma, drug-tissue interaction (inflammation), regional swelling (cellulitis)

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12
Q

How can you prevent some of these local side effects?

A

Firm bandages with sweat (alcohol) and prevent swelling

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13
Q

What are some side effects of intrasynovial anesthesia?

A

Flare: acute reactive synovitis (more with lidocaine than mepivacaine)
Hematoma
Infectious synovitis (use new bottle every time)

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14
Q

What are some things to consider with local anesthesia ?

A

-Blocked horse is unsafe to ride - stumble or kick
-Motor nerve blockage
-Stress fractures or incomplete fracture

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15
Q

What is the most distal perineural nerve block you can perform?

A

Palmar digital

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16
Q

What does the palmar digital block numb?

A

70-80% of the foot, Sole, Toe, Navicular and bursa, digital cushion, navicular suspensory apparatus, Insertion of DDF on P3

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17
Q

Where are the landmarks for this injection?

A

Just above the heel bulbs, abaxial/lateral or medial to the DDFT

Or about 1cm above the collateral cartilage

Point distal

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18
Q

What size needle and how much carbocaine should be used?

A

25G
2-3ml carbocaine
x2

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19
Q

What block is performed close to the palmar digital that can be used to desensitize the entire foot and pastern?

A

Dorsal Ring Bock

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20
Q

What is the next perineural block that you would perform after the palmar digital block?

A

Abaxial or Basiseamoid Block

21
Q

Which nerves are blocked?

A

Palmar digital block proximal to the branching

22
Q

What structures are blocked via the abaxial sesamoid block?

A

Pastern, dorsal hoof wall, coronary band, coffin joint, pastern joint, sesmoidian ligament

23
Q

What are the landmarks for the abaxial sesamoid block?

A

Locate the proximal sesamoids, palpate the mesial and lateral side to ID the nerve bundle

24
Q

What sized needle and syringe can be used and how much carbocaine?

A

22-25G, 3cc syringes
2-3ml per site
Carbocaine
x2

25
Q

What is the next block to be performed after the basiesesmoids/abaxial sesmoids?

A

Low Palmar or 4 points

26
Q

What nerves are blocked by the low 4 point?

A

Medial and lateral palmar nerves
Medial and lateral metacarpal nerves

27
Q

What should you do differently when preparing for this block?

A

Sterile prep in case you get into the fetlock joint

28
Q

What is blocked by the low 4 point?

A

Fetlock joint, Sesamoid bones, suspensory insertion on sesamoid bones

29
Q

What are the land marks for this injection?

A

Palmar to the cannon bone, dorsal to the suspensory, just distal to the button of the splint bone

Proximal to the button of the splint, on caudal side of suspensory

30
Q

What gauge needle is used and how much carbocaine?

A

22-25G
4-6ml carbocaine
x4 or x2

31
Q

What is the next perineural block that should be performed after the low 4pt?

A

High 4 pt

32
Q

What nerves are blocked by the high 4 point?

A

Medial and lateral palmar
palmar metacrapal nerves

33
Q

What should you remember about preparation for this block?

A

Sterile prep should be performed

34
Q

What are the landmarks for this block?

A

Palpate the head of the splint bone

35
Q

What is an alternative block to the high 4 point?

A

Lateral Palmar/Wheat

36
Q

Which joint should you start with blocking?

A

Distal Interphalangeal

37
Q

What does blocking the DI joint block?

A

DIP, Navicular bursa and toe of sole

38
Q

How much lidocaine should you use for DIP Joint block?

A

6ml and give it 5-10 min

39
Q

What is the Podotrochlear (navicular) Bursa injection best for?

A

Specific for navicular problems
Radiography to confirm positioning
Stand or flexed
3-5ml

40
Q

Is the proximal interphalangeal joint block commonly performed?

A

Uncommon
-cant get much synovial fluid from it
-up to 10ml local anesthetic

41
Q

What is the next joint block?

A

Metacarpophalangeal Joint
10ml
10min

42
Q

What is the next joint after the metacarpophalangeal joint to be blocked?

A

Carpal Joint
Perform separte for specificity
5-10ml each joint

43
Q

How do you perform the low plantar and distal plantar block in the hind limb?

A

Same as the palmar digital block just easier if not flexed due to the reciprocal apparatus

44
Q

What nerves are blocked in the high plantar block?

A

Medial and lateral plantar and plantar metatarsal nerves
18G limb off ground
2injection site 5-10mleach
Block PSD and TMT joint

45
Q

Intrsynocial in hind similar to forelimb. Ture or False?

A

Ture - flexed just harder

46
Q

How do you block the tarsometatarsal?

A

Lateral, proximal head of MT IV
20G 1.5inch
4-8ml
Doesn’t communicate wit DIT joint

47
Q

Dista Intertarsal joint injection?

A

Difficult, medial, 22-25G, cuneal tendon
Stand opposite side of horse
Fluid not normally obtained

48
Q

Tarsocrural - communicates with PIT, saphenous vein overlies dorsomedial pouch
30ml

A

Ture

49
Q

When injecting the stifle, how many joints need to be injected?

A

3 separately
20-30ml/joint