The assessment of carotid artery stenosis severity using CDUS is largely dependent on the pattern and velocities of blood flow within the carotid arteries, with the peak systolic velocity (PSV) in the internal carotid artery generally serving as the primary diagnostic parameter. There are a number of cardiac disorders that can affect flow velocities and Doppler waveforms within the cerebrovascu...

Doppler sonography of 29 extracranial carotid arteries was performed twice within three days or less. Angiography revealed stenoses with from 10 to 95% diameter reduction in 25 internal carotid arteries whereas four vessels were found to be normal. The systolic peak frequency of the internal carotid artery read from the Doppler spectrum (n = 29) could be reproduced very well. This was shown by ...

OBJECTIVES to establish on a national basis whether the diagnostic accuracy of carotid duplex justifies carotid surgery without preoperative angiography. DESIGN prospective national multicentre study with 10 participating university and county hospitals. MATERIAL AND METHODS one hundred and thirty-four patients, aged 69+/-9 years, were subjected to routine carotid duplex ultrasonography and...

OBJECTIVE To determine the frequency and characteristics of carotid artery stenosis in acute ischaemic stroke patients and to assess the significance of common risk factors for carotid stenosis in these patients. METHOD One hundred consecutive patients admitted with acute ischaemic stroke were included in the study. The relevant history, physical examination and laboratory investigations were...

The value of duplex Doppler sonography as a noninvasive technique for evaluating the carotid neck vessels has been well documented [1-4]. The sensitivity and specificity of duplex Doppler sonography in the detection of high-grade stenosis (greater than 80%) approximates 90% [1] . However, duplex Doppler sonography has several limitations. Plaque ulceration cannot be detected reliably, even with...

Ophthalmic artery blood flow in 5 patients with internal carotid artery occlusion of sudden onset was monitored by an ultrasonic Doppler flowmeter to investigate the possible relationship to spontaneous recanalization of the occluded artery. The occluded internal carotid arteries of 2 patients were confirmed angiographically to recanalize and the reversed flow of their ophthalmic arteries chang...