The ASIA Exam Flashcards
How do we find the motor level in the ASIA exam?
the most caudal segment with normal motor function on each side of body - evaluated by assessing myotomes and voluntary anal contraction
How do we find the sensory level in the ASIA exam?
the most caudal segment with normal sensory function on each side of body - evaluated with key sensory point within 28 dermatomes and deep anal sensation.
Explain scoring of dermatomes
2 - normal sensation
1 - altered sensation
0 - absent sensation
How does muscle function testing differ from standard MMT for ASIA exam?
- Entire exam in supine
- No + or - scores
- Option for documented Not testable (NT)
What are the UE Key Muscles?
C5: elbow flexors
C6: wrist extensors
C7: elbow extensors
C8: finger flexors
T1: finger abduction (little finger)
What are the LE Key Muscles?
L2: hip flexors
L3: knee extensors
L4: ankle DF
L5: long toe extensors
S1: ankle PF
Why were the key muscles chosen?
- Representative of each spinal cord segment
- Each muscle/action has functional significance
- Each muscle/action is adequately accessible and easily isolated in supine
- Each muscle has innervation of at least 2 spinal segments.
If a sensory level (LT/PP) =2, what can be assumed about motor function?
presumed that motor would be 5
Why are there non-key muscles included in the ASIA exam?
- Determine AIS-B vs AIS-C
- Helpful to prep for functional capabilities
What is the neurological level of injury and how do we find it? What does it represent?
- most caudal segment of SC with normal sensory and antigravity muscle function on both sides of body.
- Prognostic indicator and expected functional capabilities.
What are the components of the rectal exam for the ASIA and why are they relevant?
Digital stem + flex finger, able to feel? Y or N, ask pt to tighten and relax anal muscles on command.
False positive: tone, bearing down
How does the ASIA differentiate between complete versus incomplete injuries?
- Complete: absence of sensory and motor at S4-5
- Incomplete: partial preservation of sensory + motor funciton at S4-5
What are zones of partial preservation? When do we report them?
Dermatomes and myotomes caudal to sensory and motor levels with paritally preserved functions (recorded as single lowest preserved segment on right and left exam)
If no key muscles have partial motor function caudal to the NLI, the motor ZPP would be…
the same as the original motor level
ASI-A
NO sensory or motor function is preserved in the sacral segments S4-5.
*ZPP may be present. *