Abstract
Purpose
Against the background of the increasing dilemma in the scientific community regarding protected versus unprotected carotid artery stent (CAS) placement and the disputed points in interpreting the results of scientific studiesas well as the difficulty in conducting such randomized controlled studies, this article gives a review of experiences with carotid stent placement without the use of protection devices.
Methods
This series comprised 133 consecutive patients with 136 carotid stenoses of which 128 carotid arteries (94%) were either symptomatic (93 out of 136 = 68.4%) or had a greater than 70% stenosis (35 out of 136 = 25.7%) and 8 out of 136 were asymptomatic and had stenoses between 50% and 70%. Patients underwent neurologic and sonographic evaluation before the procedure and during follow-up (mean 18 months).
Results
Primary stent placement was carried out in 110 out of 136 lesions and predilatation was necessary before stent deployment in 26 lesions,. Neurologic periprocedural complications included 3 disabling and 1 non-disabling strokes. During the follow-up period there were 6 deaths all unrelated to the carotid disease and no major strokes. The degree of stenosis decreased from a mean of 81% to a mean of 12.3% immediately after the procedure, 22 patients were defined as restenosis of which 9 were symptomatic.
Conclusions
Carotid stent placement without the use of distal protection devices was found to be a safe and effective procedure with a relatively low incidence of periprocedural complications.
Zusammenfassung
Zielsetzung
Vor dem Hintergrund des wachsenden Dilemmas der „scientific community“ bezüglich der geschützten oder ungeschützten Platzierung eines Karotis-Stent sowie der umstrittenen Aspekte bei der Interpretationen der Ergebnisse wissenschaftlicher Studien und auch der Probleme bei der Ausführung solcher Studien werden Erfahrungen mit Platzierungen von Karotis-Stents ohne Protektionssysteme präsentiert.
Methoden
Die Untersuchungsserie umfasste 133 konsekutive Patienten mit 136 Karotisstenosen, darunter 128 Stenosen (94 %), die entweder symptomatisch (93 von 136 = 68,4 %) waren oder eine Größe über 70 % hatten (35 von 136 = 25,7 %). Acht der 136 Stenosen waren asymptomatisch und lagen zwischen 50 und 70 %. Die Patienten wurden vor der Stent-Platzierung und während der Nachuntersuchung (im Median 18 Monate) neurologisch und sonografisch betreut.
Ergebnisse
Eine primäre Stent-Platzierung wurde bei 110 der 136 Stenosen durchgeführt. Bei den restlichen 26 Läsionen war vor der Stent-Platzierung eine Prädilatation notwendig. Während der Prozedur traten neurologische Komplikationen in Form von 3 schweren und einem leichten Schlaganfall auf. Während der „Follow-up“-Periode verstarben 6 Patienten; die Todesursachen waren unabhängig von der Karotiskrankheit, und es traten keine schweren Schlaganfälle auf. Der Stenosegrad verringerte sich von einem Median von 81 % vor der Platzierung zu 12,3 % unmittelbar nach dem Verfahren. Es wurden 22 Fälle als Restenose klassifiziert, und 9 dieser Patienten waren symptomfrei.
Schlussfolgerungen
Die Platzierung eines Karotis-Stent ohne Einsatz eines distalen Protektionssystems ist ein sicheres und effektives Verfahren mit einer relativ niedrigen Rate an periprozeduralen Komplikationen.
Similar content being viewed by others
References
Wholey MH, et al. Current global status of carotid artery stent placement. Cathet Cardiovasc Diagn. 1998;44(1):1–6.
Kastrup A, et al. Early outcome of carotid angioplasty and stenting with and without cerebral protection devices: a systematic review of the literature. Stroke. 2003;34(3):813–9.
CAVATAS. Endovascular versus surgical treatment in patients with carotid stenosis in the carotid and vertebral artery transluminal angioplasty study (CAVATAS): a randomised trial. Lancet. 2001;357(9270):1729–37.
Castriota F, et al. Impact of cerebral protection devices on early outcome of carotid stenting. J Endovasc Ther. 2002;9(6):786–92.
Cremonesi A, et al. Protected carotid stenting: clinical advantages and complications of embolic protection devices in 442 consecutive patients. Stroke. 2003;34(8):1936–41.
Eckert B, Zeumer H. Editorial comment—Carotid artery stenting with or without protection devices? Strong opinions, poor evidence! Stroke. 2003;34(8):1941–3.
Lownie SP, et al. Efficacy of treatment of severe carotid bifurcation stenosis by using self-expanding stents without deliberate use of angioplasty balloons. AJNR Am J Neuroradiol. 2005;26(5):1241–8.
Forsting M. Editorial comment—with or without protection? The second important question in carotid artery stenting. Stroke. 2004;35(1):e20–1.
North American Symptomatic Carotid Endarterectomy Trial Collaborators. Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis. N Engl J Med. 1991;325(7):445–53.
Mathiesen EB, Bonaa KH, Joakimsen O. Low levels of high-density lipoprotein cholesterol are associated with echolucent carotid artery plaques: the tromso study. Stroke. 2001;32(9):1960–5.
Yadav JS, et al. Protected carotid-artery stenting versus endarterectomy in high-risk patients. N Engl J Med. 2004;351(15):1493–501.
Gronholdt ML, et al. Ultrasonic echolucent carotid plaques predict future strokes. Circulation. 2001;104(1):68–73.
Wilson JT, et al. Improving the assessment of outcomes in stroke: use of a structured interview to assign grades on the modified Rankin scale. Stroke. 2002;33(9):2243–6.
Zwiebel W, editor. Doppler evaluation of carotid stenosis. Introduction to vascular ultrasonography. 3rd ed. Philadelphia: Saunders; 1992.
Macdonald S, et al. Filter-protected versus unprotected carotid artery stenting: a randomised trial. Cerebrovasc Dis. 2010;29(3):282–9.
Taylor S, Alcocer F, Jordan WD Jr. Controversies in carotid stenting. Vasc Endovascular Surg. 2003;37(2):79–87.
Moore WS, et al. Guidelines for carotid endarterectomy. A multidisciplinary consensus statement from the ad hoc Committee, American Heart Association. Stroke. 1995;26(1):188–201.
Ferguson GG, et al. The North American symptomatic carotid endarterectomy trial: surgical results in 1415 patients. Stroke. 1999;30(9):1751–8.
Phatouros CC, et al. Endovascular treatment of noncarotid extracranial cerebrovascular disease. Neurosurg Clin N Am. 2000;11(2):331–50.
Roubin GS, et al. Immediate and late clinical outcomes of carotid artery stenting in patients with symptomatic and asymptomatic carotid artery stenosis: a 5-year prospective analysis. Circulation. 2001;103(4):532–7.
Sadato A, et al. Use of a large angioplasty balloon for predilation is a risk factor for embolic complications in protected carotid stenting. Neurol Med Chir (Tokyo). 2004;44(7):337–42; discussion 343.
Schluter M, et al. Focal ischemia of the brain after neuroprotected carotid artery stenting. J Am Coll Cardiol. 2003;42(6):1007–13.
Wholey MH, Al-Mubarek N. Updated review of the global carotid artery stent registry. Catheter Cardiovasc Interv. 2003;60(2):259–66.
Ouriel K, Yadav JS. The role of stents in patients with carotid disease. Rev Cardiovasc Med. 2003;4(2):61–7.
Pinero P, et al. Silent ischemia after neuroprotected percutaneous carotid stenting: a diffusion-weighted MRI study. AJNR Am J Neuroradiol. 2006;27(6):1338–45.
Hayashi K, et al. Case of internal carotid artery stenosis complicated with shower embolism during filter-protected carotid artery stenting. Brain Nerve. 2009;61(1):83–7.
Takayama K, et al. Initial experience of using the filter protection device during carotid artery stenting in Japan. Radiat Med. 2008;26(6):348–54.
Roffi M, et al. Flow impairment during protected carotid artery stenting: impact of filter device design. J Endovasc Ther. 2008;15(1):103–9.
Muller-Hulsbeck S, et al. Comparison of various cerebral protection devices used for carotid artery stent placement: an in vitro experiment. J Vasc Interv Radiol. 2003;14(5):613–20.
Cardaioli P, et al. Complication with an embolic protection device during carotid angioplasty. Catheter Cardiovasc Interv. 2004;62(2):234–6.
Higashida RT, et al. Reporting standards for carotid artery angioplasty and stent placement. J Vasc Interv Radiol. 2004;15(5):421–2.
Coggia M, et al. Embolic risk of the different stages of carotid bifurcation balloon angioplasty: an experimental study. J Vasc Surg. 2000;31(3):550–7.
Biasi GM, et al. Carotid plaque echolucency increases the risk of stroke in carotid stenting: the imaging in carotid angioplasty and risk of stroke (ICAROS) study. Circulation. 2004;110(6):756–62.
Bicknell CD, Cheshire NJ. The relationship between carotid atherosclerotic plaque morphology and the embolic risk during endovascular therapy. Eur J Vasc Endovasc Surg. 2003;26(1):17–21.
Maynar M, et al. Carotid stenting without use of balloon angioplasty and distal protection devices: preliminary experience in 100 cases. AJNR Am J Neuroradiol. 2007;28(7):1378–83.
Ringleb PA, Hacke W. Stent and surgery for symptomatic carotid stenosis. SPACE study results. Nervenarzt. 2007;78(10):1130–37.
Al-Mubarak N, et al. Effect of the distal-balloon protection system on microembolization during carotid stenting. Circulation. 2001;104(17):1999–2002.
Conflict of Interest
The authors declare that they have no conflict of interest.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mansour, O., Weber, J., Niesen, W. et al. Carotid Angioplasty and Stenting Without Protection Devices. Clin Neuroradiol 21, 65–73 (2011). https://doi.org/10.1007/s00062-011-0057-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00062-011-0057-6