Thrombectomy Bypass
Thrombectomy Bypass is an emergency vascular surgical procedure that restores blood flow to an acutely ischaemic limb — by removing the arterial clot and, where necessary, constructing a bypass graft around the blocked vessel — preventing irreversible limb loss and saving the patient's life.
Overview
Thrombectomy Bypass is performed as an emergency for acute limb ischaemia — a surgical emergency in which a thrombus or embolus completely blocks a major limb artery, cutting off blood supply and causing the limb to become acutely painful, pale, pulseless, and cold. A Fogarty catheter embolectomy removes the clot from the artery, and where the underlying arterial disease prevents simple clot removal, a bypass graft is constructed using the patient's own saphenous vein or a synthetic graft to route blood around the blocked segment. Time is critical — revascularisation within 6 hours prevents irreversible muscle and nerve ischaemia and limb loss.
Types of Arterial Revascularisation
The revascularisation approach is selected based on the mechanism of occlusion, the anatomy of the arterial disease, and the patient's overall cardiovascular status.
- Fogarty Embolectomy (catheter-based clot removal for embolic arterial occlusion)
- Femoro-Popliteal Bypass (above or below knee bypass for SFA occlusion)
- Femoro-Femoral Crossover Bypass (for unilateral iliac occlusion in high-risk patients)
- Aorto-Bifemoral Bypass (definitive treatment for bilateral iliac occlusive disease)
- Catheter-Directed Thrombolysis (endovascular thrombus dissolution for suitable patients)
Risk Factors for Acute Limb Ischaemia
Acute limb ischaemia results from either embolic occlusion (from the heart or a proximal aneurysm) or thrombotic occlusion (in situ thrombosis of a previously stenosed artery or bypass graft).
- Atrial fibrillation — the most common source of cardiac emboli causing acute limb ischaemia
- Left ventricular thrombus after myocardial infarction
- Pre-existing peripheral arterial disease with vulnerable atheromatous plaques
- Previous peripheral bypass graft at risk of acute in-graft thrombosis
- Popliteal aneurysm — the most common peripheral aneurysm, prone to distal embolisation
- Hypercoagulable states — antiphospholipid syndrome, malignancy, polycythaemia
Acute Limb Ischaemia Symptoms
These symptoms constitute a vascular emergency requiring immediate specialist assessment and intervention to save the limb within 6 hours of onset.
- Sudden severe pain in the affected limb — the first and most alarming symptom
- Pallor — the limb turns white or mottled as blood supply ceases
- Pulselessness — absent pulses below the level of occlusion
- Paraesthesia — numbness and tingling indicating nerve ischaemia
- Paralysis — inability to move the limb indicating advanced motor nerve ischaemia
- Perishing cold — the limb is cold and pale to touch
- Rapid onset over minutes to hours distinguishing embolism from gradual thrombosis
- Contralateral limb pulses normal in embolic occlusion
Key Benefits
Discover the advantages of choosing our thrombectomy bypass services.
Restores blood flow to a limb facing irreversible ischaemia and amputation within hours
Fogarty embolectomy achieves limb salvage without bypass in embolic occlusion cases
Immediate anticoagulation with heparin initiated before theatre prevents further clot propagation
Completion angiogram ensures complete restoration of flow before the patient leaves theatre
Emergency vascular surgical team committed to the fastest possible life-saving limb salvage
Clinical Features
The technology, techniques and clinical approach behind our thrombectomy bypass.
IV heparin commenced immediately on diagnosis preventing thrombus propagation before theatre
Fogarty embolectomy attempted before bypass construction where any possibility of success exists
Multiple catheter passes proximally and distally until return is clean bright red blood
On-table completion angiogram confirms restored flow before wound closure
Prophylactic four-compartment fasciotomy for prolonged ischaemia prevents reperfusion compartment syndrome
Preparation Instructions
After Thrombectomy Bypass, take all prescribed anticoagulation — typically heparin transitioning to warfarin or NOAC — without missing a dose to protect the bypass graft or reperfused artery from re-thrombosis. Attend regular vascular surgery follow-up with duplex surveillance of the bypass graft at 6 weeks, 3 months, 6 months, and annually. Monitor the revascularised limb daily for pulses, warmth, and colour and contact your vascular surgery team immediately for any sudden return of limb pain, pallor, or coldness suggesting re-thrombosis.
The Procedure
Step-by-step guide to what you can expect during your thrombectomy bypass procedure.
Emergency Vascular Assessment and CT Angiogram
Your vascular surgeon immediately assesses the acutely ischaemic limb using the 6 Ps — Pain, Pallor, Pulselessness, Paraesthesia, Paralysis, Perishing cold — and a CT angiogram maps the occlusion and confirms arterial runoff available for bypass before emergency theatre.
IV Heparin and Emergency Theatre Preparation
IV heparin is started immediately on diagnosis to prevent thrombus propagation. The theatre team mobilises for emergency vascular surgery — preparing Fogarty catheters, vascular instruments, synthetic and vein graft options, and the intraoperative angiogram capability.
Groin Incision and Common Femoral Artery Exposure
A groin incision exposes the common femoral artery and its bifurcation under general or spinal anaesthesia. The arteries are controlled with vessel loops before any arteriotomy is made — confirming the anatomy before committing to the arteriotomy site.
Fogarty Embolectomy Catheter Passes
An arteriotomy is made and the Fogarty balloon catheter is passed proximally into the aorta and distally into the femoral and popliteal arteries — inflating the balloon within the lumen and withdrawing it to extract the thrombus. Multiple passes are made until the return is clean, bright red blood.
Bypass Graft Construction When Required
If adequate inflow or outflow cannot be restored by embolectomy alone, a bypass graft is constructed using the reversed saphenous vein or synthetic ePTFE — sutured from the common femoral artery to the best available outflow vessel beyond the obstruction.
On-Table Angiogram and Fasciotomy
An on-table completion angiogram confirms restored arterial flow before wound closure. If the limb has been ischaemic for more than 4 to 6 hours, prophylactic fasciotomy of all four lower leg compartments is performed to prevent compartment syndrome from reperfusion swelling.
What to Expect
Thrombectomy Bypass is performed under general or spinal anaesthesia and takes 2 to 3 hours for bypass procedures. Groin and distal arterial exposure allows Fogarty catheter embolectomy of the clot, and where inadequate inflow or outflow exists, a bypass graft is constructed and confirmed patent with on-table angiography before closure. Compartment syndrome prophylactic fasciotomy may be performed simultaneously. You are monitored in vascular surgery HDU post-operatively.
Frequently Asked Questions
Common questions about thrombectomy bypass.
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