Acessibilidade / Reportar erro

Clinical profile and late follow-up of patients with bare-metal stent thrombosis

BACKGROUND: Stent thrombosis is the sudden occlusion of a stented coronary artery due to thrombus formation. Our objective was to identify variables associated to definite stent thrombosis (ST) and assess the outcomes of patients treated with bare-metal stents. METHODS: Consecutive patients treated between December 2007 and August 2012 were analyzed. Those with ST were compared to those without ST as to clinical and angiographic characteristics, and early and late outcomes. RESULTS: Of a total of 6,495 percutaneous coronary interventions (PCIs), 36 cases of ST (0.55%) were observed, of which 18 were early (50%), 14 (38.9%) late and 4 (11.1%) very late ST. Patients with ST were younger, with a greater prevalence of chronic renal failure and acute coronary syndromes. ST was more frequent in bifurcation lesions (11% vs. 4%; P = 0.03) or lesions with visible thrombus at angiography (55.5% vs. 2.8%; P < 0.01). All patients were submitted to emergency PCI, and in the in-hospital phase, myocardial infarction (MI) and death were observed in 33.3% and 16.6%, respectively. Mean follow-up was 30.2 ± 16.3 months and early discontinuation of dual antiplatelet therapy was observed in 6 of the 36 cases (16.7%). In the late follow-up target vessel revascularization was observed in 33.3%, MI in 20% and no additional deaths were observed. CONCLUSIONS: ST proved to be an event with high in-hospital mortality and late morbidity. The occurrence of this event was associated to more complex clinical and angiographic characteristics and lower compliance with dual antiplatelet therapy.

Coronary thrombosis; Angioplasty; Stents


Sociedade Brasileira de Hemodinâmica e Cardiologia Intervencionista - SBHCI R. Beira Rio, 45, 7o andar - Cj 71, 04548-050 São Paulo – SP, Tel. (55 11) 3849-5034, Fax (55 11) 4081-8727 - São Paulo - SP - Brazil
E-mail: sbhci@sbhci.org.br