Vascular Mod 5 Flashcards
1
Q
Velocity ratio calculation
A
Velocity in stenosis / velocity before stenosis
Normal < 2
2
Q
Spectral waveform at different level of stenosis
A
Normal = triphasic no broadening 1-19% = triphasic, minimal SB, PSV increase < 30% 20-49% = Triphasic, prominent SB, PSV increase 30-100% 50-99% = Monophasic, extensive SB, PSV > 100%, distal waveform monophasic/dampened Occluded = no flow
3
Q
Post-intervention follow up scans
A
q3 months for 1 year
< 50% stenosis: q6-12 months
50-75% stenosis: q3-6 months
4
Q
In stent stenosis criteria
A
> 50%
VR > 2-2.5
PSV > 180
> 70%
VR > 3.5
PSV > 300