Risk factors associated with patency loss of hemodialysis vascular access within 6 months

Area of Science:

• Nephrology
• Vascular Surgery
• Radiology

Background:

• Clinical guidelines recommend vascular access surveillance to detect and manage access dysfunction.
• Early detection of arteriovenous fistula (AVF) dysfunction is crucial for maintaining hemodialysis treatment.
• Understanding risk factors for AVF failure can optimize surveillance strategies.

Purpose of the Study:

• To investigate the association between demographic and clinical characteristics and the loss of primary functional patency within six months of first use in patients undergoing chronic renal replacement therapy with AVFs.

Main Methods:

• Retrospective study of chronic hemodialysis patients from January 2005 to June 2008.
• Comparison of demographic and clinical variables, including initial intra-access blood flow (IABF), between patients with and without loss of primary functional patency.
• Multivariable logistic regression analysis to identify independent predictors of primary patency loss.

Main Results:

• The incidence of primary AVF failure was 10% (81/831 patients).
• Independent risk factors for primary patency loss included older age (>65 years), history of diabetes, history of smoking, forearm fistula location, and low initial IABF (<500 ml/min).
• Low initial IABF (<500 ml/min) showed a particularly strong association with access failure (OR 29).

Conclusions:

• Patient risk factors, especially initial intra-access blood flow, can identify individuals at higher risk for vascular access failure.
• These findings support a more targeted approach to vascular access screening protocols.
• Proactive identification of at-risk patients can lead to timely interventions and improved outcomes.