ABSTRACT
Introdução: A reestenose intrastent (RIS), resultante da excessiva resposta reparadora neointimal após o implante da prótese, é uma das principais limitações da intervenção coronária percutânea. A despeito da eficácia dos stents farmacológicos (SF) de primeira geração no tratamento da RIS, questões relacionadas à segurança e ao perfil de flexibilidade/navegabilidade dessas próteses estimularam o desenvolvimento de novas gerações de SF. O novo SF Firebird TM (Microport Co. Ltd., Xangai, China) combina uma plataforma de aço inoxidável (316 L) de hastes finas (0,0040 polegada), um potente agente antiproliferativo (sirolimus, na dose de 9 ug/mm2) e um revestimento que inclui três camadas de polímero durável, que controla a liberação do fármaco. Apesar de ser um dos SF mais utilizados na China, pouco se conhece sobre seu desempenho, sobretudo em subgrupos de maior complexidade. Método: Entre fevereiro e dezembro de 2009, pacientes portadores de lesão reestenótica única, de stents não-farmacológicos, foram submetidos a intervenão coronária percutânea com implante de stent Firebird TM. Avaliação com angiografia ultrassom intracoronário (USIC) foi programada para todos os pacientes...
BACKGROUND: In-stent restenosis (ISR), resulting from excessive neointimal hyperplasia, is a major limitation of percutaneous coronary intervention. Despite the efficacy of first generation drug-eluting stents (DES) in the treatment of ISR, issues related to the safety and flexibility/navigability profile have encouraged the development of new generations of DES. The new FirebirdTM DES (Microport Co. Ltd., Shanghai, China) combines a stainless steel platform (L316) of fine struts (0,0040'), a powerful anti-proliferative agent (sirolimus, at a dose of 9 µg/mm²) and a coating that includes three layers of a durable polymer, which controls drug release. Though it is a most used DES in China, little is known about its performance, particularly in subgroups of greater complexity. METHOD: Between February and December 2009, patients with single bare metal stent restenotic lesions, were submitted to percutaneous coronary intervention with FirebirdTM stent implantation. Angiography and intravascular ultrasound (IVUS) were scheduled for all patients at 12 months of follow-up. The primary end-point was late loss and the percentage of in-stent volumetric obstruction at 12 months. RESULTS: Twenty-five patients with mean age of 56.8 ± 7.7 years were included, of which 80% were males and 40% diabetics. The anterior descending artery was the most frequently treated vessel (44%) and most lesions had a diffuse/proliferative pattern (64%). At 12 months, late luminal loss was 0.3 ± 0.24 mm, and no case of binary restenosis was identified. IVUS percent volumetric obstruction was 2.6 ± 1.9%. CONCLUSION: In this single center study, the new FirebirdTM DES showed favorable angiographic and IVUS results for the treatment of bare metal ISR at the one year follow-up.
Subject(s)
Humans , Male , Female , Middle Aged , Angioplasty, Balloon, Coronary/methods , Angioplasty, Balloon, Coronary , Coronary Restenosis/surgery , Sirolimus/administration & dosage , Drug-Eluting Stents/trends , Drug-Eluting Stents , Angiography/methods , AngiographyABSTRACT
Introdução: Os diabéticos representam um desafio para as intervenções coronárias percutâneas (ICP) em decorrência das elevadas taxas de reestenose, limitando a utilização desse procedimento em situações com grande perspectiva de recidiva, restringindo o emprego da técnica e predispondo à revascularização incompleta. Os stents farmacológicos contribuíram para a atenuação expressiva dessas limitações, podendo ter causado mudanças nas características dos casos tratados contemporaneamente. Assim, nosso objetivo foi comparar o perfil dos diabéticos tratados por ICP em dois momentos distintos desta década. Método: Estudo de coorte envolvendo 2.530 pacientes diabéticos revascularizados de forma consecutiva, divididos em dois grupos: grupo A, 1.309 pacientes revascularizados no período de 2006 a 2008; e grupo B, 1.221 pacientes tratados entre 2003 e 2005. Excluíram-se apenas os pacientes em que foram utilizados stents farmacológicos não disponíveis para uso comercial...
Background: Diabetic patients represent a challenge for percutaneous coronary interventions (PCI) due to the highrestenosis rates, which limit the use of the procedure in cases prone to recurrences, predisposing patients to incomplete revascularization. Drug-eluting stents (DES) have contributed for a significant improvement of these limitations and may have caused changes in the characteristics of patients treated contemporaneously. Thus, our objective was to compare the profile of diabetic patients treated intwo different periods of this decade. Method: This was a consecutive cohort study including 2,530 diabetic patientswho were divided into two groups: group A, 1,309 patients revascularized from 2006 to 2008; and group B, 1,221patients treated from 2003 to 2005. Only patients using DES not commercially available were excluded. Results: DES were more frequently used in group A (23% vs. 9%; P < 0.0001), which has a higher prevalence of insulin requiring patients (14% vs. 10%; P = 0.0001), chronic renal failure (20% vs. 10.1%; P < 0.0001), B2/C lesions(68% vs. 63%; P = 0.003), total occlusions (17% vs. 10%; P < 0.0001), stent diameter < 2.5 mm (26% vs. 22%; P = 0.01) and stent length > 24 mm (31% vs. 22%; P < 0.0001).Multivessel interventions (12% vs. 6%; P < 0.001) and complete revascularization (65% vs. 59%; P = 0.002) also prevailed in group A. Clinical hospital results were not different between groups. Conclusion: The greater availability of DES has led to significant changes in the profile ofdiabetic patients treated currently, expanding the indications for more complex patients and providing a more complete myocardial revascularization.