Noninvasive Cerebrovascular Diagnosis by Ali F. AbuRahma MD, FACS, FRCS, RVT, RPVI (auth.), Ali F.

By Ali F. AbuRahma MD, FACS, FRCS, RVT, RPVI (auth.), Ali F. AbuRahma MD, FACS, FRCS, RVT, RPVI, John J. Bergan MD, FACS, Hon FRCS (eds.)

"Noninvasive Cerebrovascular prognosis" is the most recent definitive textual content at the present suggestions utilized in assessing vascular issues. Readers will obtain authoritative info and should be guided throughout the institution and accreditation of a vascular laboratory and brought to the physics of diagnostic trying out. Chapters, written by way of chosen specialists, comprehensively clarify using ultrasound in diagnosing cerebrovascular, renovascular, visceral ischemia and peripheral arterial illness in addition to venous problems and deep stomach vascular stipulations. Noninvasive Vascular analysis comprises over three hundred illustrations, lots of them in color. end result of the particular sections which offer scientific correlations, this e-book may be helpful to physicians who deal with vascular problems, surgeons, cardiologists, vascular radiologists and the vascular laboratory staff.

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However, later is this chapter you will find that other authorities modified these criteria to be compatible with the indication for carotid endarterectomy as proposed by the North American Symptomatic Carotid Endarterectomy Trial (NASCET) and Asymptomatic Carotid Artherosclerosis Study (ACAS) trials. Normal Internal Carotid Spectra or Minimal Disease (0–15% Stenosis) The characteristic features of normal internal carotid artery spectra are shown in Figure 3–3. The peak frequency at systole is less than 4 kHz (a peak systolic velocity of <125 cm/s) with minimal degrees of spectral broadening during the initial deceleration phase of systole, followed by mild spectral broadening during diastole.

The angle of the color box should also be changed to obtain the most accurate Doppler angle between the scan lines and the direction of the blood flow. This will yield a better color display, secondary to better Doppler angle. The color box should be kept to a size that is adequate for visualizing the area of interest, and should be kept small enough to keep the frame rate at a reasonable number. The color gain should be adjusted throughout the examination to detect the changing signal strength.

26. Mattos MA, Hodgson KJ, Ramsey DE, et al. Identifying total carotid occlusion with color-flow duplex scanning. Eur J Vasc Surg 1992;6:204–210. 28 27. AbuRahma AF, Robinson PA, Khan S, et al. Effect of contralateral severe stenosis or carotid occlusion on duplex criteria of ipsilateral stenoses: Comparative study of various duplex parameters. J Vasc Surg 1995;22:751– 762. 28. AbuRahma AF, Pollack JA, Robinson PA, et al. The reliability of color duplex ultrasound in diagnosing total carotid artery occlusion.

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