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Correlation of venography, venous pressure, and hemoaccess function
D Choudhury1, J Lee, H S Elivera
1Department of Medicine, Medical College of Pennsylvania, Philadelphia.
Summary
Anatomic features of hemodialysis access predict dysfunction. Venous pressure measurements effectively predict access failure at lower blood flow rates, with critical pressures identified for specific flow rates.
Area of Science:
- Vascular Surgery
- Nephrology
- Radiology
Background:
- Vascular access is crucial for hemodialysis.
- Access dysfunction leads to significant morbidity.
- Understanding anatomic factors is key to improving access longevity.
Purpose of the Study:
- To analyze anatomic features of dialysis grafts and fistulas.
- To correlate these features with access function and dysfunction.
- To determine critical venous pressures predicting access failure at various blood flow rates.
Main Methods:
- Prospective venographic study of 46 chronic hemodialysis patients.
- Identification and incidence of anatomic lesions.
- Correlation of venous collaterals with graft function.
- Determination of critical venous pressures at different blood flow rates.
Main Results:
- Eighty-three percent of accesses exhibited outflow obstruction.
- Common lesions included venous stenosis (36.4%) and venous anastomosis issues (25.5%).
- Venous collaterals offered protection but not complete prevention of graft failure.
- Venous pressure measurements predicted failure at lower blood flow rates (BFRs).
- Critical venous pressures were 145 mm Hg at 250 mL/min and 170 mm Hg at 300 mL/min BFR.
Conclusions:
- Anatomic abnormalities are prevalent in hemodialysis access.
- Venous pressure monitoring can predict access failure, especially at lower flow rates.
- Further research needed for higher blood flow rates and diverse access types.