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Intravenous digital subtraction angiography (DSA) of hemodialysis access fistulae
Insights
Intravenous digital subtraction angiography (IV-DSA) effectively visualizes hemodialysis access complications like stenoses and aneurysms. This minimally invasive technique offers a safe alternative for evaluating vascular access anatomy and function.
Area of Science:
- Radiology
- Vascular Surgery
- Nephrology
Background:
- Hemodialysis access fistulae and grafts frequently develop complications such as thrombosis, stenoses, and aneurysms.
- Conventional diagnostic methods like retrograde venous angiography and arteriography are invasive and carry risks of arterial or graft trauma.
Purpose of the Study:
- To evaluate the efficacy of intravenous digital subtraction angiography (IV-DSA) in visualizing hemodialysis access anatomy and pathology.
- To assess IV-DSA as a safer, less invasive alternative to traditional radiologic methods for access evaluation.
Main Methods:
- Six patients with internal blood access underwent IV-DSA, with five receiving central venous injections and one a direct graft injection.
- Digital subtraction angiography was utilized to obtain high-resolution images of the access fistulae and associated vasculature.
Main Results:
- IV-DSA successfully depicted access fistula anatomy with adequate spatial resolution.
- Pathologic findings, including stenoses and aneurysms, were clearly demonstrated.
- Hemodynamic information could be inferred from the vessel opacification sequence, with ongoing development for absolute blood flow determination.
Conclusions:
- IV-DSA is a promising, minimally invasive technique for evaluating hemodialysis access complications.
- The method demonstrated good spatial resolution and identified significant pathologies without complications in this small outpatient series.
Abstract:
Hemodialysis access fistulae or grafts are subject to a variety of complications, including thrombosis, stenoses, and aneurysm or pseudoaneurysm formation. The usual radiologic methods to evaluate these problems consist of retrograde venous angiography or standard femoral or brachial arteriography. Both are invasive, and may traumatize the artery or graft. Six patients with internal blood access were studied using digital subtraction angiography; five using a central venous injection and one with direct graft injection. Preliminary results indicate that intravenous digital subtraction angiography (IV-DSA) can depict the anatomy of access fistula with adequate spatial resolution. Pathologic entities (stenoses, aneurysms) can be demonstrated, as well as other findings of uncertain clinical significance (kinks and webs). In addition, hemodynamic data can be inferred from the near-physiologic sequence of vessel opacification. Methods are in development that will allow determination of absolute blood flow in pertinent vessels via IV-DSA. There were no complications in this small series, and all examinations were performed on outpatients utilizing standard technique.