Concomitant Carotid Endarterectomy and Carotid Artery Stenting Can Safely Treat Tandem Lesions

Hybrid treatment of tandem carotid artery lesions with carotid endarterectomy and ipsilateral carotid artery stenting can be safely performed in appropriately selected patients if careful attention is paid to distal carotid clamping before stenting. So finds a retrospective review of Cleveland Clinic’s experience with the approach, which revealed no perioperative deaths and a low risk of myocardial infarction (MI) and neurological events. The study was published in the Journal of Vascular Surgery (2019 Sep 10 [Epub ahead of print]).

“We use a hybrid carotid procedure that combines the best of both worlds of open and endovascular procedures,” says Sean Lyden, MD, Chair of Vascular Surgery at Cleveland Clinic. “Our experience demonstrates a low rate of adverse events despite a high-risk cohort.”

How best to treat this difficult condition?

Tandem lesions of the internal carotid artery and proximal arch branch vessels are uncommon. This leaves uncertainty about the safest treatment approach, with mixed results reported in the literature. While open reconstruction of arch branch vessels is invasive, endovascular reconstruction is not always feasible.

Cleveland Clinic vascular surgeons use a hybrid approach that employs concomitant open carotid endarterectomy and proximal ipsilateral carotid artery stenting (see representative images below). Their recent study assesses the Cleveland Clinic experience with the procedure in 22 patients from its adoption in December 2007 through April 2017.

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X-rays showing retrograde proximal common carotid artery stenting with a balloon-expandable stent via carotid bifurcation endarterectomy patch access.

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Illustration showing carotid patch retrograde sheath access in the context of the hybrid procedure.

Cohort characteristics

The 22 patients were predominantly men (68%) and had a mean age of 70.0 + 6.1 years. They had a high rate of multiple comorbidities, with the most common being hypertension (86%), chronic obstructive pulmonary disease (56%) and diabetes mellitus (31%). In addition, 15 patients (68%) had a prior neurologic event and 12 (55%) were currently symptomatic.

All patients were either current (36%) or former smokers.

Many of the cases posed additional technical challenges. Nine patients (41%) had prior carotid endarterectomy or carotid artery stenting, with three having undergone prior neck radiation and three having had reoperative carotid surgeries.

Results

Short-term outcomes. Technical success was 100%. Mean length of hospital stay was 2.6 + 2.0 days. Adverse events were as follows:

• 1 perioperative stroke (4.5%), which was contralateral
• 1 postoperative MI (4.5%), which occurred on postoperative day 1
• 2 cranial nerve injuries (9.1%)
• 1 death within 30 days (4.5%)

The death occurred in a 74-year-old man with end-stage renal disease on dialysis who had diabetes, chronic obstructive pulmonary disease and a prior MI.

Long-term outcomes. Average follow-up of the cohort was 2.8 years. Seven patients (32%) developed more than 50% restenosis, two of whom (9%) underwent reintervention due to symptoms. Survival was 89.5% at one year and 83.1% at three years. For deceased patients whose cause of death was known, death was secondary to conditions other than stroke.

Steps to optimize success

The authors note that because this hybrid procedure is rarely performed, evidence of its safety and efficacy is limited to small series in which single events have a significant impact on outcomes data. Still, this single-center review indicates that the procedure can be performed successfully and safely by following the principles outlined below.

Select candidates carefully. In general, the procedure should be undertaken only in symptomatic patients. Otherwise, a more conservative approach with aggressive medical management is recommended. The patient in this series who had a perioperative contralateral stroke had a contralateral common carotid artery occlusion, which meta-analyses of carotid endarterectomy have shown to be a recognized risk factor for stroke and death. In many cases, however, risk is higher without treatment. Patients with end-stage renal disease are at particularly high perioperative risk of stroke and death relative to life expectancy, and most should be managed medically, especially if they have asymptomatic common and/or internal carotid artery disease.

Keep distal embolic protection foremost in mind.The following steps are recommended perioperatively:

• Perform carotid endarterectomy first in the usual fashion.
• After endarterectomy, clamp the common carotid artery for distal protection prior to retrograde common carotid access and wire manipulation. Additionally, this allows flow to be reestablished from the external to the internal carotid artery during retrograde stenting.
• Perform retrograde stenting of the proximal common carotid artery with a balloon-expandable stent in the usual fashion.
• After stenting, flush potential debris into the field and the external carotid artery and “back bleed” the internal carotid artery while again flushing the carotid access site with heparinized saline prior to arteriotomy access repair.

Intervene for restenosis only in symptomatic patients. Restenosis can be expected, as patients with tandem lesions have advanced disease and those with a history of smoking are more likely to have recurrence. As with original candidate selection, symptoms should be more of a consideration than degree of stenosis when deciding whether to intervene.

A reasonable option for a clinically challenging population

“This patient population — with multiple comorbidities and risk factors — is at high risk both from their disease and from intervention,” comments Dr. Lyden. “In contrast to other single-center institutional data, our data show that with careful patient selection and targeted techniques to lower the risk of distal embolization, tandem carotid lesions can be addressed with acceptable risk.”