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Doppler analysis of hemodialysis grafts: resistive index as a predictor of stenosis
Insights
Duplex Doppler sonography can predict venous outflow stenosis in hemodialysis vascular access patients. A specific resistive index gradient reliably indicates the presence or absence of significant stenosis, potentially reducing the need for angiography.
Area of Science:
- Vascular Surgery
- Radiology
- Nephrology
Background:
- Vascular access is crucial for hemodialysis patients.
- Venous outflow stenosis can compromise access function.
- Accurate and timely diagnosis of stenosis is essential.
Purpose of the Study:
- To identify Doppler sonographic parameters predicting venous outflow stenosis.
- To evaluate the utility of resistive index gradients in assessing hemodialysis vascular access.
Main Methods:
- Six hemodialysis vascular access patients were evaluated.
- Duplex Doppler sonography and angiography were used.
- Resistive index gradients across venous anastomoses were measured.
Main Results:
- No stenosis was observed when the resistive index gradient was ≤ 0.
- Significant stenosis (50-100%) was present when the gradient was ≥ 0.15 (P = 0.002, r = 0.963).
- Doppler sonography demonstrated high correlation with angiography.
Conclusions:
- Doppler-derived resistive index gradients are promising noninvasive predictors of venous outflow stenosis.
- This method offers rapid radiologic evaluation for hemodialysis graft patients.
- It may reduce the need for conventional angiography in equivocal cases.
Abstract:
A series of six hemodialysis vascular access patients was evaluated with duplex Doppler sonography and angiography to identify Doppler sonographic parameters that are predictors of venous outflow stenosis. This preliminary series indicates that no venous outflow stenosis was present angiographically when the resistive index gradient across the venous anastomosis is less than or equal to zero and a significant venous outflow stenosis (50 to 100%) was present when the resistive index gradient is 0.15 or greater (P = 0.002, r = 0.963). Doppler acquisition of resistive index gradients across regions of venous outflow is a promising, noninvasive means of rapid radiologic evaluation of hemodialysis graft patients, especially when the need for angiography is equivocal.