颈动脉双

定义

颈动脉双工是 超声波 test that shows how well blood is flowing through the carotid arteries. The carotid arteries are located in the neck. They supply blood directly to the brain.

选择的名字

Scan - carotid duplex; Carotid 超声波; Carotid artery 超声波; Ultrasound - carotid; Vascular 超声波 - carotid; Ultrasound - vascular - carotid; Stroke - carotid duplex; TIA - carotid duplex; Transient ischemic attack - carotid duplex

How the Test is Performed

Ultrasound is a painless method that uses sound waves to create images of the inside of the body. The test is done in a vascular lab or radiology department.

The test is done in the following way:

• 你仰面躺着. Your head is supported to keep it from moving. The 超声波 technician applies a water-based gel to your neck to help with the transmission of the sound waves.
• Next, the technician moves a wand called a transducer back and forth over the area.
• The device sends sound waves to the arteries in your neck. The sound waves bounce off the blood vessels and form images or pictures of the insides of the arteries.

How to Prepare for the Test

No preparation is necessary.

考试的感觉如何

You may feel some pressure as the transducer is moved around your neck. The pressure should not cause any pain. You may also hear a "whooshing" sound. 这很正常.

Why the Test is Performed

This test checks blood flow in the carotid arteries. 它可以检测:

• Blood clotting (thrombosis)
• Narrowing in the arteries (stenosis)
• Other causes of blockage in the carotid arteries

Your health care provider may order this test if:

• 你有一个 中风 or transient ischemic attack (TIA)
• You need a follow-up test because your carotid artery was found to be narrowed in the past or you have had 手术 on the artery
• Your provider hears an abnormal sound called a bruit over the carotid neck arteries. This may mean the artery is narrowed.

正常的结果

The results will tell your provider how open or narrowed your carotid arteries are. For example, the arteries may be 10% narrowed, 50% narrowed, or 75% narrowed.

A normal result means there is no problem with the blood flow in the carotid arteries. The artery is free of any significant blockage, narrowing, or other problem.

What Abnormal Results Mean

An abnormal result means the artery may be narrowed, or something is changing the blood flow in the carotid arteries. This is a sign of atherosclerosis or other blood vessel conditions.

In general, the more narrowed the artery is, the higher your risk for 中风.

Depending on the results, your provider may want you to:

• 考虑 手术
• Have additional tests (such as 脑血管造影术， CT血管造影，以及 magnetic resonance angiography)
• Follow a healthy diet and lifestyle to prevent hardening of the arteries
• Repeat the test again in the future

风险

There are no risks with having this procedure.

参考文献

adadamzyx P, Liebeskind DS. Vascular imaging: computed tomographic angiography, magnetic resonance angiography, and 超声波 . In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8日艾德. Philadelphia, PA: Elsevier; 2022:chap 41.

Bluth EI, Johnson SI, Troxclair L. The extracranial cerebral vessels. In: Rumack CM, Levine D, eds. 诊断超声. 5日艾德. Philadelphia, PA: Elsevier; 2018:chap 26.

Polak JF, Pellerito JS. Carotid sonography: protocol and technical considerations. In: Pellerito JS, Polak JF, eds. Introduction to Vascular Ultrasonography. 7日艾德. Philadelphia, PA: Elsevier; 2020:chap 5.