Synthetic vs. Biological Patches in Carotid Endarterectomy: A Comparative Review

Key Clinical Takeaways:

• Synthetic and biological patches show similar safety profiles regarding post-operative stroke and mortality up to 80 months.
• Evidence remains uncertain regarding rare complications like early arterial rupture or localized pseudoaneurysm formation.
• Findings stem from an updated review encompassing 15 studies and 4,971 participants primarily treated across North America, Europe, and Australia.

Understanding Carotid Endarterectomy and Patch Selection

Carotid endarterectomy is an operation to remove fatty build-up from the carotid arteries in the neck, thereby reducing stroke risk. Following the endarterectomy, surgeons typically sew a patch into the artery to widen the vessel and reinforce the repair site. These patches generally fall into two categories: biological options, such as autologous veins or bovine pericardium, and synthetic alternatives, including polytetrafluoroethylene (PTFE) and Dacron.

The core clinical question centers on whether the material choice impacts healing dynamics, local thrombosis, infection vulnerability, or recurrent arterial stenosis.

Evaluating Long-Term Efficacy and Complication Risks

The updated review synthesized data from 15 studies involving 4,971 participants, predominantly men in their sixties, conducted across North America, Europe, and Australia. Twelve of these studies, encompassing 2,021 carotid endarterectomy procedures, contributed directly to the primary comparison between synthetic and biological patch materials. The project represents an update of a review originally published 30 years ago and previously revised in 2021.

Data analysis indicates that using synthetic patches instead of biological patches probably results in little or no difference in combined stroke or death rates up to 80 months, a conclusion drawn from 6 studies involving 1,115 participants. Similarly, comparative outcomes show minimal variance regarding ipsilateral stroke up to 53 months (5 studies, 971 participants), any stroke type up to 53 months (7 studies, 1167 participants), and arterial occlusion or re-stenosis exceeding 50% width reduction up to 80 months (9 studies, 1431 participants).

Uncertainty Surrounding Acute and Rare Complications

Despite data on long-term outcomes, significant evidentiary uncertainty persists regarding acute perioperative events and rare structural failures. The available evidence remains very uncertain regarding the comparative impact of synthetic versus biological patches on ipsilateral stroke occurring during the operation or within 30 days, based on 5 studies with 797 participants. Similar uncertainty clouds the incidence of intraoperative or 30-day arterial rupture across 6 studies of 1,068 participants, as well as pseudoaneurysm formation due to repair leaks up to 80 months, observed across 5 studies comprising 980 participants.

Methodological limitations across the literature account for this uncertainty. Many investigated cohorts were small, certain studies exhibited structural reporting flaws, and critical complications occurred infrequently, limiting the statistical power required to detect risk disparities between patch categories. Consequently, larger clinical trials with extended follow-up durations remain necessary to definitively establish whether one patch class offers superior safety or efficacy.

Future Trajectory of Vascular Graft Research

As vascular surgery continues to evolve, ongoing clinical surveillance and larger prospective trials will be essential to clarify the differences between biological and synthetic repair materials. Until definitive high-powered trials emerge, vascular specialists retain the discretion to select patch materials based on patient-specific anatomy and institutional preference.

Disclaimer: The information provided in this article is for educational and scientific communication purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider regarding any medical condition, diagnosis, or treatment plan.