Monitorización del acceso vascular: parámetros convencionales frente a flujo intraacceso

Abstract

It is a major goal in hemodialysis patient to maintain permeable vascular access. Classic parameters for monitoring the vascular access are generally slow to detect stenosis. Intra-access flow calculation is a second-generation method that allows knowing the maximum access blood flow and to detect stenosis when there is a decreased flow.
The aim of this study is to assess the efficacy of the measurement and monitoring of intra-access flow compared to first-generation clinical parameters. Vascular access monitoring is done monthly, recording the physical and dynamic examination variables.
The determination of intra-access flow is performed quarterly in AVF and monthly in PTFE. Fistulography is recommended if the intra-access flow is less than 500 ml / min or a decrease by 20% confirmed on two consecutive measurements, or if there are variations in the physical examination and Kt decreased by over 25%, blood flow or increased venous pressure or recirculation. 61 fistulographies were performed. Significant differences by valuation method (p <0.001) and in false positives (stenosis <50%) (p = 0.024) was found. Intra-access flow monitoring is a highly sensitive method for detection of vascular access dysfunction. The combination of clinical, classical parameters and intra-access flow in a monitoring program for vascular access, can detect more than 80% of confirmed cases by fistulography.