Femoral Aneurysm Repair

Anatomy and Physiology

The common femoral artery is an extension of the external iliac artery once it crosses under the inguinal ligament. It bifurcates into the profunda and superficial femoral artery. The superficial femoral artery then continues distally as the popliteal artery. Femoral artery aneurysms can be anatomically classified into the following two types: type I when femoral bifurcation is not involved and type II when femoral bifurcation and profunda are involved.

Indications

Because femoral artery aneurysms are not commonly encountered in clinical practice, the threshold for repair is unclear. This is a contrast to aortic aneurysms, where larger clinical trials better establish size criteria for repair. Of course, femoral artery aneurysm repair is warranted if an aneurysm is symptomatic – thrombosed, causing distal embolization or ruptured. Consideration should be given to repair of asymptomatic femoral artery aneurysms when they exceed about 2.5 cm in diameter.[7][8]

Contraindications

In general, there are no absolute contraindications to the procedure. The procedure may be attempted under regional or local anesthesia if the patient is an exceptionally high surgical risk due to extensive medical comorbidities such as severe cardiopulmonary disease.

Equipment

The following equipment is needed for this procedure: 

• Sterile drapes
• Vascular clamps
• Occlusion balloons (in case vascular clamps are unable to control the vessel proximally or if the dissection is too difficult)
• Fluoroscopic imaging (C-arm)
• Micropuncture kit, insufflator
• A .035 wire, 5F or 6F catheter short sheath
• Heparinized saline
• Heparin
• Ultrasound machine
• Forceps
• Self-retaining retractors
• Electrocautery
• Scalpel
• Sutures
• Interposition graft such as dacron
• Bovine pericardial patch
• Contrast
• Lead shielding

Personnel

The following personnel is required for this procedure: surgeon (usually a vascular surgeon), first assistant (resident, fellow, physician assistant, medical student), nursing staff (circulator nurse, scrub tech) and anesthesiologist. A radiology technician may be needed if occlusion balloon is needed during the procedure to control bleeding.

Preparation

Informed consent should be obtained from the patient for the operative repair. Preoperative pedal pulse examination should be performed and documented as a baseline for comparison. The abdomen and bilateral groins should be prepped and draped, ensuring all sterile precautions. The procedure is usually performed under general endotracheal anesthesia because the dissection can be extensive.

Technique or Treatment

Femoral artery aneurysm is generally repaired using the open surgical technique. Endovascular placement of stent-grafts across the inguinal ligament is currently not considered the standard of care. It has been described in the management of femoral pseudoaneurysms in hemodynamically unstable patients. Some authors have also described a hybrid approach to the repair of femoral artery aneurysms whereby endografts were used with limited open dissection.

In a patient with multiple other aneurysms (such as aortic or popliteal), the symptomatic aneurysm should be addressed first. If multiple coexisting aneurysms are all asymptomatic, they should be addressed in s staged manner. Ultrasound can be helpful in planning the extent of the surgical incision. Also, if there is a preoperative CT scan or MRI, they can guide the surgeon in this regard as well. We usually perform a vertical incision in the groin for repairing femoral artery aneurysms instead of a transverse incision. An aneurysm may involve the proximal portions of the profunda and superficial femoral arteries. A vertical or longitudinal incision provides better exposure in case one encounters such a scenario. Once normal proximal and distal arterial segments are dissected out, the patient is systemically heparinized. Once the heparin has circulated for an adequate amount of time, vascular clamps are placed proximally and distally. An aneurysmectomy is performed, followed by the placement of an end-to-end interposition graft. If the proximal portions of the profunda and superficial femoral arteries are involved, a graft with a Y configuration may be used. Other configurations, depending on the aneurysm anatomy, maybe fashioned with combined use of a bovine pericardial patch or venous patch or re-implantation of superficial femoral or deep femoral artery as needed. Completion angiography can be performed if the patient had any preoperative evidence of distal embolization.

Complications

Major complications associated with the procedure include lymphatic leak, bleeding, wound infection, thrombosis/occlusion, and distal embolization.

Clinical Significance

Currently, open surgical repair of femoral artery aneurysms is the gold standard for therapy. Evolving endovascular techniques may provide durable minimally invasive means for repairing such aneurysms in the future.

Enhancing Healthcare Team Outcomes

The management of a femoral artery aneurysm is by an interprofessional team that includes an interventional cardiologist, radiologist, or a vascular surgeon. Today, minimally invasive procedures are used to close pseudoaneurysms of the femoral artery. but if the patient has atherosclerotic disease, then an open procedure with patch repair may be useful. It is important to communicate with the team on the type of closure planned. Recurrences are rare but may include loss of pulses, hematoma, and infection.

Nursing, Allied Health, and Interprofessional Team Interventions

Knowledgable operative nurses are essential for this procedure. Perianasthesia and critical nurses monitor patients, administer medications, and communicate with the interprofessional team with issues and updates.