New predictive marker for hemodialysis vascular access dysfunction.

Area of Science:

• Vascular Surgery
• Interventional Radiology
• Nephrology

Background:

• Vascular access stenosis is a common complication in hemodialysis patients.
• Accurate assessment of stenosis is crucial for maintaining access patency and function.
• Current methods for pressure assessment may have limitations in reflecting stenosis severity.

Purpose of the Study:

• To investigate the relationship between intra-access pressures and vascular stenosis.
• To compare the utility of dynamic pressure (△p) and static intra-access pressure ratios (SIAPR) in detecting and quantifying stenosis.
• To identify predictive factors for stenosis severity.

Main Methods:

• Measurement of total (pT) and static (pS) intra-access pressures before and after percutaneous transluminal angioplasty (PTA).
• Calculation of dynamic pressure (△p) and static intra-access pressure ratios (SIAPR).
• Multivariate regression analysis to identify predictors of stenosis severity.

Main Results:

• SIAPR decreased significantly only in outflow stenosis post-PTA, while △p increased in both inflow and outflow stenosis.
• SIAPR negatively correlated with stenosis severity in outflow stenosis only.
• △p correlated significantly with stenosis severity in both inflow and outflow stenosis and was an independent predictor.

Conclusions:

• Dynamic pressure (△p) is a more sensitive indicator for detecting access stenosis regardless of location compared to SIAPR.
• △p provides valuable information regarding the severity of both inflow and outflow stenosis.
• △p may be a more clinically useful parameter for managing vascular access stenosis.