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Surgically induced carotid subclavian steal syndrome. Diagnosis by video dilution technique
Insights
A rare carotid subclavian steal syndrome occurred after bypass surgery. Increased arterial flow in a bilateral amputee, not bypass obstruction, caused the steal, necessitating surgical correction.
Area of Science:
- Vascular Surgery
- Interventional Cardiology
- Diagnostic Imaging
Background:
- Carotid subclavian bypass is a treatment for arm ischemia.
- Steal syndromes can complicate vascular reconstructions.
- Accurate diagnosis is crucial for effective management.
Observation:
- A patient developed carotid subclavian steal syndrome post-carotid subclavian bypass.
- Video dilution technique assessed blood flow during angiography.
- No anastomotic stenosis was identified as the cause (55% of cases).
Findings:
- Increased subclavian artery flow, potentially due to bilateral amputee status, was the suspected cause.
- The steal phenomenon was diagnosed using video dilution technique.
- Surgical correction involved takedown of the bypass and conversion to an axillary-to-axillary bypass.
Implications:
- Video dilution technique is a valuable tool for studying vascular steal phenomena.
- This case highlights an unusual etiology for steal syndrome in amputee patients.
- Management strategies may need to consider patient-specific factors beyond anastomotic integrity.
Abstract:
A rare occurrence of carotid subclavian steal syndrome following carotid subclavian bypass for arm ischemia was described. Blood flows in the carotid artery and carotid subclavian bypass, at rest and following arm exercise, were determined by video dilution technique during the angiographic procedure. There was no obstruction of the inflow or outflow of the proximal or distal anastomoses to account for the steal (55%). Rather, increased arterial flow to the subclavian artery due to the patient's status as a bilateral amputee was thought to be the cause. The diagnosis and subsequent correction by takedown of this bypass and conversion to an axillary-to-axillary bypass were performed. Video dilution technique offers a unique and accurate way to study steal phenomena in conjunction with routine angiography and does not add to the patient's cost or risk.