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Carotid stenting (CAS) is a minimally-invasive surgical procedure available to correct carotid stenosis (narrowing of the carotid artery lumen by atheroma). Carotid stenosis can present with no symptoms (diagnosed incidentally) or through symptoms such as transient ischemic attacks (TIAs) or cerebrovascular accidents (CVAs, strokes). In a number of clinical trials, the rates of stroke and death have been noninferior or slightly lower than the current "gold standard" approach, carotid endarterectomy.
Over 14,000 patients have been enrolled in trials to evaluate the results of carotid stenting in patients at high risk for surgery. High risk characteristics include anatomical or medical co-morbid considerations. The most significant study to date has been the SAPPHIRE study, which in a randomized controlled study showed carotid stenting to be noninferior to endarterectomy in total major adverse event rates, but superior in rates of major procedural stroke, cranial nerve palsy, and myocardial infarction. (Yadav et al. "Protected Carotid-Artery Stenting versus Endarterectomy in High-Risk Patients". New England Journal of Medicine. October 7, 2004. pp 1493-1501)
The question of carotid stenting in non-high-risk patients has yet to be answered, with a few trials ongoing, including the Carotid Revsacularization Endarterectomy versus Stenting Trial (CREST) funded by the National Institutes of Health (NIH.)
Additional recommended knowledge
The aim of CAS is to prevent the adverse sequelae of carotid artery stenosis secondary to atherosclerotic disease, i.e. stroke.
Carotid stenting is currently indicated for the following patients:
Patients who are: Symptomatic with >50% stenosis Asymptomatic with >80% stenosis And at least one anatomic or co-morbid risk factor placing them at high-risk for adverse events from CEA:
Anatomic Contralateral carotid occlusion Contralateral laryngeal palsy Post-radiation treatment Previous CEA recurrent stenosis High cervical ICA lesions CCA lesions below the clavicle Severe tandem lesions
Co-morbid Congestive Heart Failure (Class III/IV), and/or known severe left ventricular dysfunction <30% Open-heart surgery within 6 weeks Recent myocardial infarction (>24 hours and <4 weeks) Unstable angina (CCS class III/IV) Synchronous severe cardiac and carotid disease requiring open heart surgery and carotid revascularization Severe pulmonary disease to include any of the following: Chronic oxygen therapy Resting P02 of < 60 mmHg Baseline hematocrit > 50% FEV1 or DLCO < 50% of normal Abnormal stress test Age greater than 80 years
Patient Selection Warnings:
Lesion Characteristics: Patients with evidence of intraluminal thrombus thought to increase the risk of plaque fragmentation and distal embolization. Patients whose lesion(s) may require more than two stents. Patients with total occlusion of the target vessel. Patients with lesions of the ostium of the common carotid. Patients with highly calcified lesions resistant to PTA. Concurrent treatment of bilateral lesions.
Access Characteristics: Patients with known peripheral vascular, supra-aortic or internal carotid artery tortuosity that would preclude the use of catheter-based techniques. Patients in whom femoral or brachial access is not possible
Patient Characteristics: Patients at low-to-moderate risk for adverse events from carotid endarterectomy. Patients experiencing acute ischemic neurologic stroke or who experienced a stroke within 48 hours. Patients with an intracranial mass lesion (i.e., abscess, tumor, or infection) or aneurysm (>9mm). Patients with arterio-venous malformations of the territory of the target carotid artery. Patients with coagulopathies. Patients with poor renal function, who, in the physician’s opinion, may be at high-risk for a reaction to contrast medium. Patients with perforated vessels evidenced by extravasation of contrast media. Patients with aneurysmal dilation immediately proximal or distal to the lesion. Pregnant patients or patients under the age of 18.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Carotid_stenting". A list of authors is available in Wikipedia.|