Doppler ultrasound exam of an extremity
Alternative names:
Doppler ultrasonography
How the test is performed:
The test is done in the ultrasound or radiology department.
To examine the veins: A water-soluble gel is placed on the transducer (a hand-held device that directs the high-frequency sound waves to the artery or vein being tested) and the skin over the veins of the extremity being tested. There is a "swishing" sound on the Doppler if the venous system is normal. Both the superficial and deep venous systems are evaluated.
To examine the arteries: Blood pressure cuffs will be put around the thigh, calf, and ankle to examine the legs. In the arms, the blood pressure cuffs are placed at different points along the arm. A conductive paste is applied to the skin over the arteries being examined. The cuff will be inflated above the normal systolic blood pressure for the extremity. The transducer is placed near the cuff, and the pressure in the cuff is released slowly. When the "swishing" is detected that is recorded as the blood pressure. This is repeated for each cuff.
How to prepare for the test:
Remove clothing from the extremity.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel:
There is no discomfort.
Why the test is performed:
This test is done as an alternative to arteriography and venography. It may help diagnose a blood clot, or venous insufficiency, arterial occlusion (closing), abnormalities in the carotid artery blood flow caused by a narrowing, and to evaluate trauma to the arteries. The test may also be used to monitor arterial reconstruction and bypass grafts.
|
