CHECK-UP:A venogram is a diagnostic procedure that locates blockages in the veins, writes MARION KERR.
Can you tell me what a venogram is?
A venogram is a test used to look at veins using special contrast dyes and X-rays. The test is most usually used to view veins in the abdomen and in the legs to identify and locate blood clots in the veins. If there are no blockages, the dye will flow freely through the venous system. A blockage can be the result of a clot, growth or inflammation.
Why does dye have to be used?
When an X-ray is taken, dense structures such as bones appear white, other tissues will look grey and air will show up as black. Veins are not usually detected on X-ray unless a special dye called contrast is injected into the vein to highlight them during the X-ray.
A needle is usually placed in the vein of the foot of the leg that is being X-rayed. An intravenous line is then inserted through which the contrast dye flows.
A tourniquet may be placed at some point on the leg to allow the dye to travel to deeper veins. While the dye is infusing, X-rays are taken. Once the procedure is complete the catheter is withdrawn and the needle site is dressed.
I’m a bit of a wimp when it comes to needles, so how much is this going to hurt?
Although the procedure is usually performed while the patient is awake, local anaesthesia is used to numb the area. If you are a little anxious, a mild sedative may be used to help relax you.
Talk to your doctor before the procedure is performed to clarify if sedation would be an option for you. During the test you will be lying on an X-ray table which may feel a little cold and hard.
Apart from mild discomfort when the needle and catheter are inserted, you may also experience a burning sensation when the dye is injected into the vein. For a short period after the test you may find the injection site to be a little tender or some mild bruising may occur.
Some individuals can develop an allergic reaction to the contrast dye. If you have had an allergic reaction to medications or other contrast dyes in the past, let your doctor know before you have the test.
He may arrange for you to undergo an MRI, CT scan or ultrasound investigation instead.