Vein mapping

Question 1

LSV is the preferred conduit for?

Answer 1

• arterial bypass grafting in the coronary arteries and lower limb

Question 2

u/s can assess the suitability of saphenous vein mapping by?

Answer 2

• measuring the caliber and available length

- measurement taken in transverse plane with little probe pressure

Question 3

ideal saphenous vein measurement if long femoro-distal graft is considered?

Answer 3

> 3-4mm wide and >2mm at the ankle

Question 4

Saphenous vein mapping- The vein may be removed for?

Answer 4

a coronary bypass or reversed lower limb arterial graft

• thrombus must be ruled out

Question 5

If an insitu lower limb arterial graft is to be performed, then what needs to occur?

Answer 5

perforating veins and superficial branches must be ligated to prevent an arteriovenous fistula from developing

Question 6

when mapping the saphenous vein the examination is performed with patient in what position?

Answer 6

• standing to produce distension of the vein

- allows easier location and better estimation of the caliber of the vessel

Question 7

when are fiber tipped markers used?

Answer 7

to mark the skin along the course of the vein and to locate perforators

Question 8

where are markings made?

Answer 8

• at the location of the vein at each end of the transducer length
• Once the main marks have been applied, the location of the SFJ,dual segments and tributaries can be identified and marked

Question 9

Limitations and pitfalls of vein mapping? (6)

Answer 9

The technique has limitations and pitfalls
Patients may not be able to stand
Patient body habitus and tolerance for compression may be an issue
Bandages
Casts
Swelling