[Monitoring therapeutic arteriovenous fistulas in chronic hemodialysis patients. Value of the continuous Doppler test combined with real-time echotomography]. / Surveillance des fistules artério-veineuses thérapeutiques chez des hémodialysés chroniques. Intérêt de l'examen au Doppler continu couplé à l'examen échotomographique en temps réel.

Continuous doppler investigation of functioning of therapeutic arteriovenous fistula is a well-established routine. The availability for the last few years of high frequency (10 mg/Hz) real-time ultrasound has enabled visualization of superficial arteries and veins. Total afferent and efferent branches of these therapeutic fistulae can be visualized. Examination should therefore include continuous doppler recordings combined with real-time ultrasound of both transverse and sagittal sections of the different arteries and veins participating in the fistula. The indication for examination is clinical in cases with low or high output or during the immediate postoperative period to detect early thrombosis.