Vessel Recognition (Review from Term 2) Flashcards
CCA
Medium pulsitility
Sharp upstroke
Diacritic notch (transition from systole to diastole representing closure of aortic valve)
Low diastolic flow
Close to baseline
PSV: 80-100 cm/s
Landmark: lateral to thyroid gland lobe in TRV
ICA
Monophasic Low pulsatility Rounded peak Large window High diastolic flow Away from the baseline PSV: <125 cm/s Landmark: lateral when locating from bulb
ECA
Triphasic Moderate pulsatility Taller/sharper upstroke Low diastolic flow Near baseline PSV: 120 cm/s Landmark: medial when locating from the bulb, narrower than ICA
Vertebral
Low pulsatility
Similar to ICA with lower velocity/sharper peak
Forward flow through diastole
Travels cephalad through transverse foramina C6-C2
PSV: 20-60 cm/s
Landmark: find CCA and angle out laterally to locate
SCA/INN
High pulsatility High resistance Triphasic Sharp upstroke Reversed diastolic + forward diastolic PSV: 140 cm/s Landmark: posterior to clavicle
PROX STENOSIS
Biphasic Swishing Higher peaks Less diastolic flow (A more critical stenosis will have higher EDV pre-stenosis)
INSIDE STENOSIS
High velocities
Aliasing
High pitched
POST-STENOSIS
Post-stenotic turbulence
High velocities
Shattered peaks
Can have simultaneous forward/reverse flow
DISTAL STENOSIS
Low systole
Damped diastole due to decrease pressure drop across stenosis
Flow reversal disappears
CCA
Medium pulsitility
Sharp upstroke
Diacritic notch (transition from systole to diastole representing closure of aortic valve)
Low diastolic flow
Close to baseline
PSV: 80-100 cm/s
Landmark: lateral to thyroid gland lobe in TRV
ICA
Monophasic Low pulsatility Rounded peak Large window High diastolic flow Away from the baseline PSV: <125 cm/s Landmark: lateral when locating from bulb
ECA
Triphasic Moderate pulsatility Taller/sharper upstroke Low diastolic flow Near baseline PSV: 120 cm/s Landmark: medial when locating from the bulb, narrower than ICA
Vertebral
Low pulsatility
Similar to ICA with lower velocity/sharper peak
Forward flow through diastole
Travels cephalad through transverse foramina C6-C2
PSV: 20-60 cm/s
Landmark: find CCA and angle out laterally to locate
SCA/INN
High pulsatility High resistance Triphasic Sharp upstroke Reversed diastolic + forward diastolic PSV: 140 cm/s Landmark: posterior to clavicle
PROX STENOSIS
Biphasic Swishing Higher peaks Less diastolic flow (A more critical stenosis will have higher EDV pre-stenosis)
