Nerve Blocks in Horses Flashcards
What is the block location for a palmar digital block?
Around medial and palmar digital nerves between proximal sesamoid bones and foot cartilages
What areas are desensitized by a palmar digital block?
50-70% of palmar/plantar aspect of the foot
What joint is blocked with a palmar digital nerve block?
Coffin joint (distal interphalangeal) - except the proximodorsal region
What is the lowest nerve block you can do in a horse?
Palmar digital
What is the next block up from a palmar digital block in a horse?
Abaxial
What is the block location for an abaxial sesamoid block?
Around medial and lateral palmar digital nerves @ medial/lateral aspect of proximal sesamoid bones
What areas are desensitized by an abaxial sesamoid block?
Skin @ distal pastern, foot
What joints are blocked with an abaxial sesamoid block?
Pastern (proximal interphalangeal) and coffin joints
Which block is proximal to the abaxial sesamoid block?
Low 4-point
What is the block location for a low 4-point?
Dorsolateral/medial to DFT @ distal metacarpal bone proximal to fetlock joint + distal to end of each splint bone
Which nerves are blocked with a low 4-point?
Palmar nerves and palmar metacarpal nerves
What areas are desensitized by a low 4-point block?
Entire fetlock joint + everything distal to the joint
What is the most proximal distal limb block used in a horse?
High 4-point (subcarpal)
Which nerves are anesthetized with a high 4-point?
Palmar and palmar metacarpal nerves
What is the block location of a high 4-point?
Between suspensory lig and DDF just distal to carpus + between suspensory lig and splint bones @ palmar cortex of cannon bone
What areas are desensitized with a high 4-point block?
Metacarpal region, entire fetlock and digit
If a horse blocks to a low 4-point, where is the lesion causing lameness?
Fetlock joint or below
Which block blocks the palmar part of the food?
Palmar digital nerve block
Which block desensitizes the foot, pastern, and fetlock joint?
Low 4 point block
Which block desensitizes the leg distal to the carpus/tarsus (metacarpals and below)?
High 4 point block
Which block is good to use if there is a problem at the pastern (prox interphalangeal) joint?
Abaxial block
Which block desensitizes the deep branch of the lateral palmar nerve at the level of the carpometacarpal joint?
Suspensory lig block
