Transcarotid Artery Revascularization (TCAR)

A Comprehensive Clinical Guide for Certified Surgical Technologists & CST Exam Candidates

1. Procedure Overview

Transcarotid Artery Revascularization (TCAR) is a minimally invasive hybrid vascular procedure designed to treat significant carotid artery stenosis — a narrowing of the carotid artery that substantially increases the risk of embolic stroke. TCAR combines a small cervical incision with endovascular stent placement, and critically employs a proprietary flow reversal system that temporarily redirects blood flow away from the brain during stent deployment, dramatically reducing the risk of periprocedural embolic stroke.

Unlike traditional Carotid Endarterectomy (CEA), which requires direct arteriotomy, plaque excision, and patch angioplasty, TCAR accesses the common carotid artery through a small incision at the base of the neck and introduces a stent delivery system under continuous fluoroscopic guidance. The Enroute® Transcarotid Neuroprotection System (Silk Road Medical) is the dominant proprietary platform used for this procedure.

Why the Patient Needs This Procedure

Carotid artery stenosis results from progressive atherosclerotic plaque at the carotid bifurcation. Plaque rupture or fragment embolization can cause ischemic stroke or TIA. TCAR stabilizes the lesion with a stent while protecting the brain by reversing ipsilateral carotid flow through an extracorporeal filter circuit, capturing embolic debris during manipulation.

Underlying Pathology

  • Atherosclerosis — lipid‑rich plaque at the carotid bulb.
  • Vulnerable plaque — thin fibrous cap with high embolic potential.
  • Hemodynamically significant stenosis — typically ≥50% symptomatic or ≥70–80% asymptomatic.
  • Prior CEA restenosis — recurrent lesions where reoperation risk is high.

Expected Surgical Outcome

TCAR restores luminal diameter, reduces embolic risk during intervention, and stabilizes plaque. Clinical data (ROADSTER trials) show low 30‑day stroke rates in appropriately selected, high‑risk patients. Outcomes depend on imaging selection, antiplatelet management, and meticulous technique.

When TCAR Is Preferred Over Alternatives

  • High surgical risk for CEA (severe cardiopulmonary disease, prior neck radiation, hostile neck anatomy).
  • Restenosis after prior CEA.
  • High carotid bifurcation inaccessible to open exposure.
  • Unsuitable for transfemoral CAS due to aortic arch or vessel tortuosity.
  • Symptomatic stenosis ≥50% or asymptomatic ≥70–80% meeting guideline criteria.

2. Indications & Contraindications

Primary Indications

  • Symptomatic carotid stenosis ≥50% — ipsilateral TIA, amaurosis fugax, or non‑disabling stroke within 6 months.
  • Asymptomatic carotid stenosis ≥70–80% in high‑surgical‑risk patients.
  • Post‑CEA restenosis where reoperation risk is elevated.
  • Radiation‑induced carotid stenosis with fibrotic neck planes.
  • High carotid bifurcation (at/above C2) not amenable to CEA exposure.

Secondary / Less Common Indications

  • Contralateral carotid occlusion with ipsilateral high‑risk lesion.
  • Tandem proximal CCA and ICA lesions amenable to stenting.
  • Patients with tracheostomy or prior anterior cervical spine surgery.

Contraindications

  • Ipsilateral carotid occlusion — no flow to reverse.
  • Insufficient venous outflow — central venous stenosis preventing femoral return.
  • CCA too short or tortuous — requires ≥5 cm straight CCA segment for sheath seating.
  • Heavily calcified access site or active infection at the incision site.
  • Allergy to stent materials (nickel/titanium) or inability to tolerate DAPT.
  • Contralateral occlusion without adequate collaterals — relative contraindication.

Preoperative Considerations for CSTs

  • Review CTA/duplex to confirm bifurcation level and lesion morphology.
  • Confirm DAPT compliance (aspirin + P2Y12) and coagulation labs.
  • Verify Enroute® system component lot numbers and expirations before opening (placeholders below).
  • Confirm C‑arm functionality and contrast availability; verify renal function and allergies.

Device Component Verification (fill manually before case):

  • Enroute® NPS Kit Lot #: [ENTER LOT #]
  • Transcarotid Access Sheath Serial #: [ENTER SERIAL #]
  • Inline Filter Lot #: [ENTER LOT #]
  • Carotid Stent Model / Lot #: [ENTER MODEL & LOT]

3. Relevant Anatomy

Carotid Artery System

The right CCA arises from the brachiocephalic trunk; the left CCA arises from the aortic arch. Each ascends within the carotid sheath (with the IJV and vagus nerve) and bifurcates at ~C3–C4 into the ICA and ECA. The ICA is the target for stent deployment; the ECA is temporarily occluded during flow reversal to prevent retrograde embolization.

  • CCA — access vessel for TCAR; lies deep to SCM and medial to IJV.
  • ICA — target vessel; supplies anterior/middle cerebral circulation.
  • ECA — occluded with balloon during protection phase.
  • Carotid bulb — baroreceptor region; manipulation can cause bradycardia.

Blood Supply & Collaterals

  • Thyrocervical trunk and superior thyroid artery supply neck musculature.
  • Circle of Willis provides collateral cerebral perfusion during flow reversal.
  • Common femoral vein is the return limb for the flow reversal circuit.

Nerves and Structures at Risk

  • Vagus nerve (CN X) — posterior in carotid sheath; injury → vocal cord palsy.
  • Hypoglossal nerve (CN XII) — courses over bifurcation; injury → tongue deviation.
  • Marginal mandibular branch (CN VII) — at risk with high dissection.
  • Internal jugular vein — lateral to CCA; venous injury causes bleeding/air embolus risk.
  • Thoracic duct (left side) — risk of chyle leak with low neck dissection.

Spatial orientation (CST perspective): From the instrument table, the SCM is retracted laterally; the carotid sheath is incised to expose the CCA 2–3 cm deep from skin. Keep instruments within fluoroscopic field and coordinate C‑arm approach before draping.

4. Required Supplies & Equipment

TCAR is a hybrid procedure — both open vascular and endovascular/fluoroscopy setups must be prepared. Open and endovascular back tables should be complete before patient entry.

Instrument Trays

Item

Why It Is Needed

Basic Vascular Tray

Open dissection instruments for neck exposure and CCA access

Vascular Specialty Tray

Vascular clamps, vessel loops, fine instruments for carotid sheath dissection

Minor/Peripheral Tray (Femoral Access)

Percutaneous femoral venous access for venous return limb

Specialty / Open Instruments (selected)

  • Self‑retaining retractor (Weitlaner/Cerebellar) — hands‑free exposure.
  • Right‑angle (Mixter) clamps — vessel isolation for sheath insertion.
  • DeBakey forceps — atraumatic vessel handling.
  • Potts‑Smith scissors — fine dissection/arteriotomy extension.
  • Vessel loops & Rummel tourniquets — proximal/distal control and sheath fixation.
  • Bulldog clamps, Satinsky — backup vascular control.
  • Bipolar cautery & nerve hook — precise hemostasis and nerve protection.

Enroute® TCAR System Components (select)

Component

Why It Is Needed

Enroute® Transcarotid Neuroprotection System (NPS)

Complete flow reversal circuit connecting CCA sheath to femoral venous return through an external filter

Transcarotid access sheath (9 Fr)

Direct CCA access conduit for wires and stent delivery

Venous return sheath (8 Fr)

Femoral venous access for circuit return

Inline embolic filter

Captures debris during reversed flow

0.014″ guidewire (stiff/hydrophilic)

Crosses lesion and supports stent delivery

Carotid stent (nitinol)

Scaffolds stenotic ICA/CCA segment

Post‑dilatation balloon (3–5 mm)

Optimizes stent apposition

Disposable Supplies, Drapes & Dressings

  • 10‑blade and 15‑blade scalpels; heparinized saline syringes; stopcock manifolds; pressure tubing/transducer.
  • Sterile C‑arm drape; fenestrated groin drape; impervious under‑drapes.
  • 4×4 gauze, Tegaderm, compression dressing for groin.
  • Sutures: Prolene 5‑0 (purse‑string), Vicryl 3‑0/4‑0, Monocryl 4‑0 for skin.

Imaging & Radiation

Mobile C‑arm (bi‑plane preferred), power injector or hand injection setup, iodinated contrast (iohexol/iopamidol). Ensure lead aprons and thyroid shields are available for all scrubbed personnel and that sterile C‑arm drape is ready.

5. Medications Used in the Case

All medications transferred to the sterile field must be labeled immediately. Confirm drug, concentration, and time verbally with the circulator before passing.

Medication

Purpose

Heparin sodium

Systemic anticoagulation (ACT goal ≥250 s)

Heparinized saline

Continuous flush for sheaths/catheters

Protamine sulfate

Heparin reversal if ordered

Iodinated contrast (iohexol/iopamidol)

Angiography and completion runs

Lidocaine 1% (no epi)

Local infiltration for MAC cases

Topical thrombin

Local hemostasis at arteriotomy

6. Patient Positioning & Room Setup

  • Position: Supine with slight contralateral head turn; shoulder roll for neck extension; ipsilateral arm tucked.
  • Padding: Protect occiput, elbows, and pressure points; secure EKG leads away from field.
  • Table attachments: Arm boards tucked; foam head donut; ensure C‑arm clearance on contralateral side.
  • Prep area: Neck and ipsilateral groin prepped with CHG (or Betadine if CHG allergy); fenestrated groin drape placed for femoral access.
  • Draping sequence: Sterile half‑sheet, U‑drape for neck, sterile C‑arm drape; maintain separate sterile zones for neck and groin to avoid cross‑contamination.
  • Equipment placement: Instrument table on surgeon’s instrument side; endovascular cart and stent kit within reach; contrast and flush syringes on sterile back table; monitor and C‑arm controls accessible to radiology tech.

7. Step-by-Step Procedural Sequence

The following table provides a chronological, CST‑focused walkthrough from incision to closure. For each step the surgeon’s actions, CST responsibilities, instruments used, and critical safety cues are listed.

Step

Surgeon

1

Skin incision along anterior SCM; dissect to carotid sheath; expose CCA.

2

Place purse‑string suture on CCA and insert transcarotid access sheath.

3

Obtain femoral venous access percutaneously; place venous return sheath.

4

Connect arterial and venous sheaths to Enroute® NPS; prime circuit and initiate flow reversal.

5

Perform diagnostic angiography; cross lesion with 0.014″ wire; position stent delivery system.

6

Deploy carotid stent under flow reversal; post‑dilate as needed.

7

Complete angiogram to confirm patency and absence of distal emboli; terminate flow reversal.

8

Remove sheaths; secure arteriotomy with purse‑string and close neck incision in layers.

8. Potential Complications

  • Intraoperative: embolic stroke (despite protection), arterial injury, access site bleeding, cranial nerve injury, bradycardia from carotid sinus stimulation.
  • Postoperative: hematoma, restenosis, infection, groin complications (pseudoaneurysm), stent thrombosis if antiplatelet therapy is inadequate.
  • CST vigilance: watch for expanding neck hematoma, airway compromise, sudden neuro changes, and excessive groin bleeding; prepare for rapid instrument and medication changes (topical thrombin, protamine, additional sutures).

9. Postoperative Considerations

  • Dressings: sterile occlusive dressing over neck incision; compression dressing over groin access site.
  • Drains: rarely required; if placed, document output and secure tubing away from neck movement.
  • Specimen handling: none typically; if filter debris is retrieved, label and send per facility protocol and document device lot/serial numbers.
  • Immediate concerns: airway patency, neuro checks, hemodynamic stability, groin site hemostasis.
  • Documentation: device lot/serial numbers, ACT values, contrast volume, intraoperative events, and neuro status at handoff.

10. Key Points for CST Mastery

  • Anticipation skills: prime the flow circuit and heparinized flushes before incision; have post‑dilatation balloon and bailout stent immediately available.
  • Instruments always ready: vascular tray, vessel loops, Prolene 5‑0 for purse‑string, bulldog clamps, bipolar cautery.
  • Common surgeon preferences: pre‑drawn contrast syringes, 50:50 contrast dilution, specific balloon sizes (3–5 mm), and whether to use MAC vs GA.
  • Efficiency tips: label all syringes, maintain separate sterile zones for neck and groin, coordinate C‑arm positioning pre‑drape, and pre‑count filter cartridges.
  • Sterile technique: avoid crossing tubing between neck and groin fields; change gloves after handling non‑sterile items; maintain closed circuit for flow reversal.

Printable CST Checklist (TCAR)

  • Review CTA/duplex and confirm bifurcation level
  • Confirm DAPT and coagulation labs
  • Verify Enroute® kit lot/serial numbers (enter on device log)
  • Prepare vascular and femoral trays; prime heparinized flushes
  • Confirm C‑arm, contrast, and power injector readiness
  • Label all syringes and document medication times
  • Have protamine, topical thrombin, and additional sutures available
  • Count sponges and instruments per protocol before closure

Last reviewed: 06/06/2026

Clinical owner: Vascular Surgery Department — David Munro CST, CVOR

Internal links: Surgical instruments | Sterile technique | Common surgical procedures

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Surgical Instruments Sterile Technique Vascular Procedures CST Exam Prep Carotid Endarterectomy (CEA)