Segmental Pressures Flashcards
ankle systolic pressure should be ___ compared to brachial pressure
greater or equal to
segmental pressures
pressure cuff should be inflated ____mmHg above the last audible signal
20-30mmHg
segmental pressures
if repeating, wait ___ prior to re-inflating pressure cuff
1 minute
segmental pressures
flow is detected using ___
CW Doppler
calcified vessels can produce ___ pressures
falsely elevated pressures
conditions that preclude obtaining a pressure (4)
DVT
dialysis access fistula or graft
lymphedema
post-bypass graft or angioplasty with stenting
4 cuff method differentiates
inflow (aorta/iliac) vs SFA disease
4 cuff locations
brachial - bilateral
2 thighs - high thigh & above knee
below knee
ankle
3 cuff method provides
accurate thigh pressure measurements
3 cuff locations
brachial - bilateral
1 thigh
below knee
ankle
lower extremity cuff size
brachial
calf & ankle
4 cuff method thigh
3 cuff method thigh
brachial: 10-12cm
calf & ankle: 10cm
4 cuff method thigh: 12cm
3 cuff method thigh: 19 cm
what is the 20% rule?
width of cuff 20% greater than the diameter of the limb
4 cuff method (2 thigh cuffs) violates the 20% rule and will result in ___
artifactually elevated thigh pressures
~30mmHg higher
what arteries are used to obtain ankle pressures?
ATA/DPA
PTA
**record both and report the highest
multiple inflation cuffs beyond systolic pressure may result in ___
how to avoid this
result in transient ischemia - induced vasodilation
avoid by starting with arm, then ankle and move proximal
upper extremity cuff size
brachial
forearm
brachial 12cm
forearm 10cm
normal ABI
> 1.0
mildly abnormal ABI
0.9 - 1.0
ABI for probable claudication (single level disease)
< 0.8
ABI suggestive of multi-level disease or long segment occlusion
< 0.5
ABI of ischemic rest pain
< 0.3
ABI > ___ is invalid
1.3
calcified vessels
question values if brachial systolic pressure are
< 100mmHg
> 200mmHg
lower extremity
___ or greater pressure drop is significant
30mmHg or greater
