Introduction and Aims: Native arteriovenous fistula (AVF) is considered the gold standard of vascular access for hemodialysis due to its longer survival, fewer complications, less mortality and costs. Patency is important for an effective dialysis treatment and this remains a challenge in nephrology. There are not well defined the prognostic factors for short and long term AVF survival. The aim is to evaluate comorbidity, biology and ultrasound (US) variables as prognostic factors for early
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