Is there a role for Ultrasound in evaluating abdominal aortic aneurysms? US is often used as a screening tool for patients at increased risk for an AAA or to monitor patients with a known AAA. Sonographically, the proximal, mid, and distal abdominal aorta are imaged, and their greatest outer diameters are measured in the sagittal …
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Can Ultrasound detect subclavian steal syndrome ? A routine component of the carotid artery US examination is demonstration of the patency, direction of flow, and waveform of the vertebral arteries in the neck. Normally, the vertebral arteries demonstrate monophasic antegrade flow toward the head. Biphasic or complete reversal of flow away from the head in …
Carotid artery string sign Severe narrowing of the ICA such that only a small amount of residual flow is seen along the almost completely occluded (>95% stenosis) artery lumen is referred to as the “string” sign. Such a high-grade ICA stenosis needs to be distinguished from a completely occluded ICA because a patient with a …
What are the sonographic criteria for diagnosing extracranial carotid artery stenosis? The presence and amount of carotid plaque, the PSV in the ICA and CCA, the EDV in the ICA, and the ratio of the ICA PSV to the CCA PSV are all used to detect and quantify the degree of carotid artery stenosis. Greater …
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How are the extracranial carotid arteries evaluated sonographically? Sonographic evaluation of the carotid arteries in the neck involves gray scale imaging to detect wall thickening, plaque, and the degree of luminal narrowing. Color spectral Doppler imaging is used to demonstrate the presence and direction of blood flow as well as the velocity of blood flow. …
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Common indications for carotid artery Ultrasound • Evaluation of patients with transient ischemic attacks or cerebrovascular accident. • Evaluation of carotid bruit or pulsatile neck mass. • Follow-up for known carotid artery stenosis or dissection. • Follow-up after carotid endarterectomy or stenting. • Preoperative screening prior to major vascular surgery.
How is venous insufficiency evaluated sonographically? Venous insufficiency is most commonly due to valvular damage from a DVT. In the lower extremities, venous insufficiency is best assessed sonographically with the patient in the upright position with provocative maneuvers (i.e., Valsalva and calf squeezing). Color spectral Doppler waveforms are obtained of both deep and superficial veins …
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