Carotid Artery Stenting (CAS)

Endovascular alternative to carotid endarterectomy for symptomatic or high-grade asymptomatic carotid stenosis. Balloon angioplasty + self-expanding stent deployment across the lesion, with embolic protection device (distal filter or proximal flow reversal) deployed before any manipulation to catch plaque debris and prevent procedural stroke.

Clinical pathway

Femoral or radial access; occasionally direct carotid cutdown (TCAR — transcarotid artery revascularization) for difficult arches.
Arch aortogram + selective common carotid angiography — characterize arch anatomy (Type I / II / III), lesion length, calcification, tortuosity.
Embolic protection deployment — distal filter across the lesion into the distal ICA, or proximal flow reversal system (Mo.Ma, ENROUTE).
Pre-dilation (sometimes skipped) with a small balloon.
Stent deployment — self-expanding nitinol stent sized to common carotid and ICA.
Post-dilation with a sized balloon.
Filter retrieval + final angiography — document distal intracranial runs to rule out embolic event.

Typical systems

Single-plane is usually sufficient; biplane helpful for selective arch work in Type III arches and for distal intracranial runs.

Room + procedure characteristics

Procedure time: 60–120 min typical.
Team: vascular surgeon, interventional cardiologist, or neurointerventionalist depending on center; local anesthesia + conscious sedation standard.
Neurological monitoring: continuous during procedure — patient squeezes squeaky toy, responds to commands; new neurologic deficit during procedure is the canonical embolic-event signal.
Dose: moderate; neck + arch fluoroscopy time drives dose.

Equipment considerations that bite

Detector size — large-FOV (FD20-class) for arch overview; small-FOV cardiac rooms can run CAS but limit selective arch work.
Dose-management software — long fluoro on Type-III arch cases makes ClarityIQ / CARE / AutoEx operationally meaningful.
3D rotational angiography (XperCT / DynaCT / Innova CT) — useful for tortuous anatomy planning; licensed feature.
Selective catheter inventory — Simmons / VTK / JB-2 catheters, embolic protection devices (Spider FX, Emboshield NAV6), nitinol stents (Acculink, Xact, RX Acculink).
Tube heat capacity — long-fluoro cases on a marginal tube trip thermal limits.

Operational reality

Procedure-volume concentration — CAS volume has shifted in many centers as TCAR (transcarotid revascularization) has gained share for high-arch-risk anatomy. Equipment requirements differ for transcarotid access.
CMS reimbursement coverage — CAS reimbursement has been gated by symptomatic-status and surgical-risk criteria; coverage expansions in 2023+ have shifted volume.
Single-room sufficiency — most carotid programs run on existing peripheral / IR rooms rather than dedicated dual-purpose builds.