Abstract
Using an ultrasound duplex system composed of doppler flowmeter and B-mode colour scanner, we evaluated arteriovenous fistula dysfunctions, such as impaired shunt flow or high venous pressure, in 14 patients requiring chronic hemodialysis. Insufficient venous dilatation and venous thrombosis were demonstrated as the etiologies of arteriovenous fistula dysfunction. Dissection of the venous wall, venous valve and deep accessory vein were also clearly recognized on colour doppler imaging. The percent of stenosis in arteriovenous fistulas could be calculated by measuring the areas or flow rates in the stenotic portion compared to that distal or proximal to the stenotic sites.
It was concluded that the ultrasound duplex system was useful for diagnosing arteriovenous fistula dysfunction because it can demonstrate a three-dimensional view showing the intravascular structure and deep accessory vein and can calculate the percent area stenosis.
