Carotid endarterectomy (CEA) remains a gold standard for stroke prevention. Surgeons often perform it under local anesthesia to monitor the patient's neurological state in real-time. However, carotid endarterectomy NIRS monitoring offers an additional layer of safety by tracking cerebral oxygenation levels. This technology helps clinicians identify high-risk patients who require a shunt to prevent perioperative ischemia.

The Utility of Carotid Endarterectomy NIRS Monitoring

A recent study analyzed 635 patients to determine the correlation between NIRS value drops and surgical needs. Specifically, the researchers applied shunts to any patient experiencing a 30% or greater decrease in NIRS values. Consequently, they found that these quantitative changes effectively predicted the necessity of intervention. Furthermore, patients with contralateral total occlusion (CTO) demonstrated significantly higher rates of NIRS value decreases. This group required more frequent shunt use compared to patients without CTO.

Using NIRS in conjunction with wakefulness monitoring provides a robust defense against neurological deficits. Additionally, the study confirmed that NIRS monitoring effectively reflects the patient's neurological state during the clamping phase. Moreover, this approach allows for precise timing of shunt placement, reducing unnecessary risks. Clinicians can thus rely on NIRS as a sensitive tool for early detection of neurological events.

FAQs

How does NIRS guide shunt use in CEA?

NIRS measures regional cerebral oxygen saturation (rSO2). A significant drop, typically 30% or more, indicates reduced perfusion, signaling the need for a shunt to maintain blood flow.

Why is wakefulness important during carotid endarterectomy?

Performing CEA under local anesthesia allows the patient to remain awake. This enables immediate clinical detection of neurological changes that might not be visible on monitors alone.

What is the impact of contralateral total occlusion (CTO) on NIRS?

Patients with CTO are at higher risk because they lack compensatory flow. They often show sharper NIRS decreases and have a higher likelihood of requiring a shunt.

Disclaimer: This content is for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

Toktaş F et al. The role of carotid endarterectomy performed under local anesthesia with near-infrared spectroscopy in the detection of early neurological events. Turk Gogus Kalp Damar Cerrahisi Derg. 2026 Feb 17. doi: 10.4274/tjtcs.2026.28320. PMID: 41700460.

Jonsson M, Lindström D, Wanhainen A, Djavani Gidlund K, Gillgren P. Near Infrared Spectroscopy as a Predictor for Shunt Requirement During Carotid Endarterectomy. Eur J Vasc Endovasc Surg. 2017;53(6):783-791.

Pennington GW, et al. Near-infrared spectroscopy monitoring during carotid endarterectomy. J Vasc Surg. 2023;77(4):1120-1128.