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Carotid artery disease, characterized by atherosclerotic plaque accumulation in the carotid arteries, significantly increases ischemic stroke risk due to stenosis or embolism. High-grade stenosis (≥70%) in those who are symptomatic poses the greatest threat, while moderate stenosis (50%-69%) and severe asymptomatic disease also warrant intervention. Carotid endarterectomy (CEA), the primary surgical treatment, effectively removes plaque to restore blood flow and prevent stroke. Contemporary data indicate perioperative stroke risks below 1% in specialized centers, reflecting advancements in technique and patient selection. Alternative procedures, such as carotid artery stenting (CAS) and transcarotid artery revascularization (TCAR), serve high-risk patients, but CEA remains the preferred standard for most. Effective management hinges on precise imaging, rigorous perioperative care, and collaboration among surgeons, neurologists, and anesthesiologists to optimize outcomes and minimize complications. The course equips clinicians with comprehensive carotid artery disease management knowledge, emphasizing evidence-based patient selection, advanced imaging interpretation, and refined surgical techniques. Participants gain practical insights from landmark trials, mastering perioperative blood pressure control, complication recognition, and intraoperative neuromonitoring interpretation. The curriculum also explores CAS and TCAR, enhancing decision-making for diverse patient profiles. Collaboration with an interprofessional team, including vascular surgeons, radiologists, and critical care specialists, fosters integrated care, improving complication management and patient safety. Participants develop technical proficiency and confidence, enabling precise interventions and informed treatment strategies. This multidisciplinary approach ensures holistic patient care, reduces procedural risks, and enhances long-term stroke prevention, ultimately elevating surgical outcomes. Objectives: Identify patients who are appropriate candidates for carotid artery surgery based on symptomatology, degree of stenosis, and imaging findings. Differentiate between symptomatic and asymptomatic carotid artery disease and determine corresponding treatment strategies. Screen for comorbidities, such as coronary artery disease and hypertension, that may impact surgical risk and outcomes.

Identify patients who are appropriate candidates for carotid artery surgery based on symptomatology, degree of stenosis, and imaging findings. Differentiate between symptomatic and asymptomatic carotid artery disease and determine corresponding treatment strategies. Screen for comorbidities, such as coronary artery disease and hypertension, that may impact surgical risk and outcomes. Collaborate with anesthesiologists, nurses, pharmacists, and rehabilitation specialists to optimize intraoperative and postoperative care, including hemodynamic management and stroke prevention. Access free multiple choice questions on this topic.

Symptoms of extracranial carotid disease are most often caused by embolization. Arterial emboli account for approximately one-quarter of strokes in Europe and North America, and 80% of these originate from atherosclerotic lesions in a surgically accessible artery in the neck. The most common lesion is at the bifurcation of the carotid artery. Lesions of atherosclerosis in the internal carotid artery occur along the wall of the carotid bulb opposite to the origin of the external carotid artery. Enlarging the bulb just distal to this major branch point creates a low wall shear stress area, resulting in flow separation and loss of unidirectional flow. This allows for greater interaction between atherogenic particles and the vessel walls at this site, accounting for the localized plaque at the carotid bifurcation. Transcranial Doppler (TCD) studies have shown that emboli are observed in approximately 20% of patients with moderate (>50% stenosis) lesions at the carotid bifurcation, and even higher rates are seen with more than 70% stenosis. The incidence and frequency of emboli are increased in patients who have recently become symptomatic.[1][2][3] The neurologic dysfunction associated with microemboli may appear as sudden or transient neurologic symptoms, including unilateral motor and sensory loss, aphasia (difficulty finding words), or dysarthria (difficulty speaking due to motor dysfunction). These are referred to as transient ischemic attacks (TIA). Most TIAs are brief, lasting only a few minutes. By convention, 24 hours is the arbitrary limit of a TIA. If the symptoms persist, it is a stroke or cerebrovascular accident (CVA). An embolus to the ophthalmic artery, the first branch of the internal carotid artery, can produce a temporary monocular vision loss, known as amaurosis fugax, or permanent blindness.

The neurologic dysfunction associated with microemboli may appear as sudden or transient neurologic symptoms, including unilateral motor and sensory loss, aphasia (difficulty finding words), or dysarthria (difficulty speaking due to motor dysfunction). These are referred to as transient ischemic attacks (TIA). Most TIAs are brief, lasting only a few minutes. By convention, 24 hours is the arbitrary limit of a TIA. If the symptoms persist, it is a stroke or cerebrovascular accident (CVA). An embolus to the ophthalmic artery, the first branch of the internal carotid artery, can produce a temporary monocular vision loss, known as amaurosis fugax, or permanent blindness. The prevalence of significant carotid artery stenosis (defined as≥50% narrowing) is approximately 1.2% to 1.8% globally.[4] The annual occurrence rate ranges from 2% to 6%.[5] The cumulative risk of stroke may be as high as 15% in the first year and 30% within 5 years.[6] Moreover, as high as one-fourth of patients harbor a risk of recurrent stroke within 5 years.[7] Stroke results from thromboembolism originating from vulnerable plaques and low-flow states, inducing hypoxic-inducible factor 3A.[4][8] A large lipid-rich necrotic core, intra-plaque hemorrhage, surface fissures, minimal calcification, and a thin fibrous cap are hallmarks of vulnerable plaques.[8][9] The study of lesion biology through contrast-enhanced ultrasound and vessel wall imaging is more critical than assessing luminal narrowing through angiography alone, as applied in the North American Symptomatic Carotid Endarterectomy Trial (NASCET) and European Carotid Surgery Trial (ECST) trials.[8][10][11][12] There is also an emerging role of proteomic analysis, artificial intelligence, and machine learning in determining the same.[10][13][14] The accessibility of this localized atheroma enables the effective removal of the plaque and a significant reduction in stroke risk. Without treatment, 26% of patients with TIAs and more than 70% with carotid artery stenosis will develop permanent neurological impairment from continued embolization at 2 years. The risk of CVA can be reduced to 9% with plaque removal, and is typically lower for patients presenting with amaurosis fugax.[15][16] Carotid revascularization procedures comprise: Carotid endarterectomy (CEA) Carotid artery stenting (CAS) Transcarotid artery revascularization (TCAR) [17]

The study of lesion biology through contrast-enhanced ultrasound and vessel wall imaging is more critical than assessing luminal narrowing through angiography alone, as applied in the North American Symptomatic Carotid Endarterectomy Trial (NASCET) and European Carotid Surgery Trial (ECST) trials.[8][10][11][12] There is also an emerging role of proteomic analysis, artificial intelligence, and machine learning in determining the same.[10][13][14] The accessibility of this localized atheroma enables the effective removal of the plaque and a significant reduction in stroke risk. Without treatment, 26% of patients with TIAs and more than 70% with carotid artery stenosis will develop permanent neurological impairment from continued embolization at 2 years. The risk of CVA can be reduced to 9% with plaque removal, and is typically lower for patients presenting with amaurosis fugax.[15][16] Carotid revascularization procedures comprise: Carotid endarterectomy (CEA) Carotid artery stenting (CAS) Transcarotid artery revascularization (TCAR) [17] CEA was first reported by Eascott et al in 1954 and described in 1975 by DeBakey.[4][18] Annually, 150,000 patients undergo CEA globally.[19] In the United States, the annual usage of the procedure decreased from 51.6 to 22.5 cases per 100,000 population from 2006 to 2020.[4] Carotid revascularization procedures have profound benefits if performed within 2 weeks of the index event.[4] Surgery is usually deferred in the initial 48 hours (except in crescendo TIAs or stroke in evolution), owing to increased risk of periprocedural thromboembolic events from plaque instability and vulnerability.[4] Revascularization is not recommended for cohorts with diminished consciousness, disabling strokes (modified Rankin Scale score ≥3), and infarctions involving >30% of the middle cerebral artery region.[4] ECST, NASCET, and Veteran Affairs Cooperative Study (VACS) proved the superiority of CEA plus medical therapy over medical therapy among symptomatic individuals with >70% carotid stenosis.[4] The 5-year risk reduction of 16% with 1-month stroke and mortality risk of 7.1% was observed. The risk reduction was a mere 4.6% for cohorts with 50% to 69% stenosis, with no benefits observed if the stenosis was less than 50%.[4]

Revascularization is not recommended for cohorts with diminished consciousness, disabling strokes (modified Rankin Scale score ≥3), and infarctions involving >30% of the middle cerebral artery region.[4] ECST, NASCET, and Veteran Affairs Cooperative Study (VACS) proved the superiority of CEA plus medical therapy over medical therapy among symptomatic individuals with >70% carotid stenosis.[4] The 5-year risk reduction of 16% with 1-month stroke and mortality risk of 7.1% was observed. The risk reduction was a mere 4.6% for cohorts with 50% to 69% stenosis, with no benefits observed if the stenosis was less than 50%.[4] CEA is superior to CAS in symptomatic CAS.[18] CEA has also been shown to ameliorate carotid artery stenosis-induced cognitive dysfunction.[20] Only CEA improves visual acuity.[21] The endarterectomy versus stenting in patients with symptomatic severe carotid stenosis (EVA-3S) trial and International Carotid Stenting Study (ICSS) reported a higher risk (2- to 3-fold) of stroke or death associated with stenting.[4] The North American carotid revascularization endarterectomy versus stenting (CREST) trial revealed a high risk of stroke in CAS and myocardial infarction in CEA.[4] The European Stroke Organization (ESO) does not advocate stenting for patients older than 70.[4]

CEA, while effective, carries risks that must be weighed carefully against its benefits. The 2 most feared perioperative complications are stroke and myocardial infarction, with stroke rates reported up to 3.4% and myocardial infarction rates around 2.2% in meta-analyses comparing regional versus general anesthesia, and a pooled 1-month mortality rate of 1.1% based on combined data from NASCET, ESCT, and the VACS trial.[9][22] This high-risk profile is partly attributable to the fact that 50% to 75% of patients with significant carotid stenosis also have concomitant atherosclerotic coronary artery disease.[9][22] Perioperative blood pressure management is crucial; systolic pressures exceeding 180 mm Hg preoperatively or 220 mm Hg postoperatively are strongly associated with increased stroke and mortality risk.[22] CHS, often due to poorly controlled postoperative hypertension, is another potentially devastating complication and is associated with seizures in approximately 1% of cases.[27][28] Cranial nerve injuries—most commonly to the vagus and hypoglossal nerves—are typically caused by excessive retraction and remain a notable source of postoperative morbidity.[18] Local complications include wound hematoma, laryngeal edema, and infection.[22] Specific anesthetic complications, particularly from deep cervical plexus blocks, include arterial injury, inadvertent intraarterial or intrathecal injection (leading to brainstem anesthesia), and phrenic nerve paralysis.[22] Although protective in cases of poor collateral flow or low intraoperative stump pressure, the use of shunts carries its risks, including embolization (air or plaque), intimal tearing, and arterial dissection.[22] Carotid restenosis is another long-term complication, for which TCAR appears to offer more favorable outcomes than redo CEA (rCEA).[5][29] IONM, although valuable, has several limitations. EEG is less sensitive to deep cortical ischemia and can be challenging to interpret. SSEPs, though useful, are less specific and sensitive than EEG. NIRS lacks precision in assessing MCA flow and can be confounded by extracranial circulation and ambient light. TCD, while helpful for detecting emboli, is operator-dependent and limited by poor acoustic windows in some patients; fortunately, 90% of observed microemboli are benign.[22]

Although protective in cases of poor collateral flow or low intraoperative stump pressure, the use of shunts carries its risks, including embolization (air or plaque), intimal tearing, and arterial dissection.[22] Carotid restenosis is another long-term complication, for which TCAR appears to offer more favorable outcomes than redo CEA (rCEA).[5][29] IONM, although valuable, has several limitations. EEG is less sensitive to deep cortical ischemia and can be challenging to interpret. SSEPs, though useful, are less specific and sensitive than EEG. NIRS lacks precision in assessing MCA flow and can be confounded by extracranial circulation and ambient light. TCD, while helpful for detecting emboli, is operator-dependent and limited by poor acoustic windows in some patients; fortunately, 90% of observed microemboli are benign.[22] When comparing revascularization strategies, transfemoral carotid artery stenting (TFCAS) is associated with a significantly higher risk of perioperative stroke, approximately 70% greater, and nearly 3 times the risk of in-hospital death compared to CEA.[28] Both hospital and 1-year stroke/death outcomes are inferior with TFCAS relative to CEA and TCAR, with odds and hazard ratios of 1.31 and 1.4, respectively.[30] TCAR, while slightly increasing stroke risk compared to CEA, offers advantages in patients with high bifurcations or reoperative necks.[28] Urgent CEA performed within 6 hours of a crescendo TIA can achieve comparable neurologic outcomes to elective CEA, but carries a higher risk of perioperative myocardial infarction and overall mortality.[31] These considerations underscore the importance of patient selection, surgical expertise, meticulous technique, and perioperative hemodynamic control in optimizing outcomes.

Successful carotid artery surgery demands technical surgical skill and seamless interprofessional collaboration to optimize patient outcomes, enhance patient safety, and ensure efficient team performance. Physicians and advanced clinicians must work closely to evaluate candidacy for surgery, taking a detailed history, performing neurological assessments, and ordering appropriate imaging studies to ensure accurate diagnosis and treatment. Surgeons require meticulous operative technique, anesthesiologists must manage blood pressure tightly before, during, and after the procedure to prevent hypoperfusion or hyperperfusion injuries, and nurses play a crucial role in preoperative education, intraoperative assistance, and vigilant postoperative monitoring for neurologic changes or wound complications. Pharmacists contribute by managing antiplatelet and anticoagulation therapy, ensuring optimal medication timing to balance the risks of thrombosis and bleeding. Physical therapists and rehabilitation specialists may be involved early in the postoperative period for stroke prevention and functional recovery if neurologic deficits occur. Effective communication and clearly defined roles among the interdisciplinary team are vital. Structured handoffs, standardized protocols, and regular preoperative briefings ensure that all team members anticipate potential complications, understand the surgical plan, and are prepared to intervene rapidly if issues arise. Regular team-based simulation training, focusing on carotid procedures, stroke management, and emergency response, fosters trust, reinforces individual responsibilities, and enhances situational awareness. Patient-centered care is further supported by involving patients and families in shared decision-making, providing clear education about risks and benefits, and coordinating follow-up care through a multidisciplinary approach. Such comprehensive, team-based strategies ultimately improve patient satisfaction, reduce perioperative complications, and enhance long-term outcomes following carotid artery surgery.

An improved stroke risk stratification (not merely degree of stenosis) is of paramount importance for patients with carotid artery stenosis.[4][8][38] Careful patient and procedure selection are the cornerstones of improving carotid revascularization outcomes.[30] Utilizing the CEA pathway can help reduce the financial burden without compromising the clinical outcomes of CEA.[39]