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What is the name of the test that bounces Hi Freq sound waves off blood vessels and heart to form a picture?
Intra Vascular Ultrasound (IVUS)
What size sheath and guide catheter is used for IVUS?
During IVUS, what type of guide wire is passed to the distal part of the artery being examined?
Angioplasty Guidewire (0.014)
List six things that should appear on an IVUS image.
- Overall Available Lumen
- Wire Shadow
- IVUS Catheter
- Stent Struts
What is the size of an IVUS catheter?
- 2.9-3.5 French
- Diameter (0.957-1.16mm)
At the conclusion of an IVUS test, what is an angiography study being used to check for?
Disruption or injury due to intravascular equipment on the coronary artery in question.
How is IVUS used for Clinical Research?
Restenosis prevention, proper stent placement, and proper stent expansion.
One line blood flow, forward views of CTO, and HD imaging of better stable/unstable plaques are examples of the ________ of IVUS.
Future Technological Developments
What does FFR stand for?
Fractional Flow Reserve
Translesional physiolocgical equipment used to determine if treatment is required
What wire is similar to a standard 0.014 angioplasty guidewire, but has a transducer mounted on from it's tip?
Where is the transducer mounted on a pressure wire
3cm from the tip
What are the advantages of FFR?
- Absolute value of 1.0
- Not affected by hemodynamic perturbation
- Specific for epicardial coronary disease
What size guide catheter would a doctor normally choose for FFR?
5 or 6 French
What medications are normally administered preprocedure of FFR?
Heparin and IC NTG
If the doctor deems it neccesary, what can the pressure wire also be used for?
What medication is adminstered to obtain maximum hyperemia in a FFR procedure?
- (140 mcg/kg/min drip)
- (20-30 mcg/kg/min IC)
What type of stents are most commonly used in Peripherial vessels?
Self expanding stents
What are the self expanding stents made of?
List the periperhal vascular in order of blood flow.
- Carotid Arteries
- Abdominal Aorta
- Popliteal (knees)
- Anterior/Posterior Tibial
- Dorsalies Pedis (top of foot)
How do you determine FFR ratio?
- Distal / Proximal
- ex: 80/120 = 2/3 = 66%
If FFR ratio is lower than _____% then a treatment (balloon or stent) will be needed.