Lameness in Horses Additional Concepts Flashcards
What is the onset and duration of lidocaine?
Onset: Rapid
Duration: 1.5-3 Hours
What is the onset and duration of Mepivicaine?
Onset: Rapid
Duration: 2-3hrs
What is the onset and duration of Bupivicaine?
Intermediate Onset
Duration: 3-6hrs
What are sources of articular pain?
Synovium, joint capsule, articular/periarticular ligaments, periosteum, subchondral bone
What structure in a joint has no nerve endings and does not cause pain?
Cartilage
What is the correct order that you should perform nerve blocks?
Distal to proximal
How do you prepare a patient for a perinural nerve block versus an inteasynovial block?
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
What sized needles can be used for perineural blocks?
25g 5/8in - 18g 1.5inc
Smaller needle - less pain, more likely to break
Larger stronger
General 18G
What kind of syringe should you use?
Non-lock and leuer
How do you know if your patient has improved from your block?
Very subjective - use manipulation test and circles, aim for 100% improvement (may switch sides) and should achieve >70% improvement
What are some local side effects of perineural analgesia?
Local swelling - hematoma, drug-tissue interaction (inflammation), regional swelling (cellulitis)
How can you prevent some of these local side effects?
Firm bandages with sweat (alcohol) and prevent swelling
What are some side effects of intrasynovial anesthesia?
Flare: acute reactive synovitis (more with lidocaine than mepivacaine)
Hematoma
Infectious synovitis (use new bottle every time)
What are some things to consider with local anesthesia ?
-Blocked horse is unsafe to ride - stumble or kick
-Motor nerve blockage
-Stress fractures or incomplete fracture
What is the most distal perineural nerve block you can perform?
Palmar digital
What does the palmar digital block numb?
70-80% of the foot, Sole, Toe, Navicular and bursa, digital cushion, navicular suspensory apparatus, Insertion of DDF on P3
Where are the landmarks for this injection?
Just above the heel bulbs, abaxial/lateral or medial to the DDFT
Or about 1cm above the collateral cartilage
Point distal
What size needle and how much carbocaine should be used?
25G
2-3ml carbocaine
x2
What block is performed close to the palmar digital that can be used to desensitize the entire foot and pastern?
Dorsal Ring Bock