Interpretation of LE Segment Pressures Flashcards
How is the ABI calculated
highest rt ankle pa / highest brachial pa
highest lft ankle pa/ highest brachial pa
API stands for
ankle arm pressure same as ABI
what is normal ABI
> 1.0
what is value within normal limits for ABI
> .9 - 1.0
what ABI value indicates mild arterial disease
.8 - .9
what is ABI value for moderate disease (claudication)
.5 - .8
what value indicates severe arterial disease ( rest pain)
< .5
ABI of incompressable vessels / unreliable values , which have ____elevated systolic pressures
> 1.3 - 1.5
falsely elevated systolic pressures
what is most reliable measurement when vessels are calcified
toe pressures
what has a stronger weight for predicting symptoms of rest pain than ABI of < .5
absolute ankle pressure < 50 mmHg (single level disease)
ABI of ____ represents single level disease
____ suggests multiple lesions
less than or = to .5 (single segment)
less than .5 (multiple lesions )
segmental pressure drop of ____ or _____ between two consecutive levels suggests significant obstruction
greater than 30 mmHg
greater than 20 mmHg “consecutive levels “ -
ipsilateral
horizontal difference of ____ or ____ suggests obstructive disease at or above the level in the leg with the lower pressure
greater than or = to 20 mmHg or 30 mmHg \
“Horizontal “
in the 4 cuff method what things should you remember about the seg pa values
2
the high thigh > 30 mmHg than highest brachial
the AK and BK pa are at least the same as the highest brachial pa
in the 3 cuff tec what 2 things should be remembered about the segmental pressure values
thigh pressure is similar to the highest brachial pressure
does not allow for differentiation of HT to AK pressures
what is true about toe pressures
2
less than or = to 30 mmHg are foot ulcers that did not heal
toe pressures may be more reliable in the diabetic pressure
what is compared in exercise segmental pressures
resting values to post exercise values
what does exercise testing used to r/o
true claudication vs false claudication
what are contraindications to exercise testing
SOB severe HTN cardiac problems stroke walking problems
what is procedure for the test
pt WALKS <12% elevation
1.5 MPH for 5 min or until pain severity causes pt to stop
what is documented throught the test
MPH onset location and progression of sx duration of exercise recover time pressure changes pre and post exercise
Post exercise doppler pressures are obtained how
- abnormal ankle
- other ankle
- brachial pressures
with drop after exercise (abnorm results) pressures are obtained every two minutes until pre exercise pressures are attained
interpretation of exercise ABI
normal : ABI increases
abnorm : ABI decreases
exercise testing :
what is recovery time for single level disease
2-6 minutes ABI to increase back to resting levels afgter it has dropped to low or unrecordable levels after exercising
