The reported incidence of stent fracture after sirolimuseluting stent implantation ranges from 1.9 to 16% according to different series. It has been associated with increased rate of restenosis and long-term cardiac events. We describe the case of a patient with a telescoped stent fracture associated with stent occlusion, after 6 years of telescoped sirolimus-eluting stent implantation. It was detected using multislice computed tomography and invasive angiography.

La fractura del stent es una complicación que se ha comunicado luego del implante de stents liberadores de sirolimus con una frecuencia que oscila entre el 1,9% y el 16% según las series y que se asocia con una tasa mayor de reestenosis y de eventos cardíacos a largo plazo. En esta presentación se describe el caso de un paciente en el que, casi 6 años después del implante de dos stents liberadores de sirolimus telescopados, a través de tomografia computarizada multidetector y angiografía invasiva se evidenció la fractura de los stents telescopados, asociada con oclusión del stent.

Objective. To evaluate the presence of obstructive coronary artery disease (OCD) in patients with negative SPECT undergoing 64-slice coronary CT angiography. Material and methods. From July 2007 to January 2010, patients with negative SPECT undergoing CT angiography were assessed. We used a Philips Brilliance 64-slice CT scanner and low osmolality iodinated contrast. Coronary arteries were divided into 16 segments and the presence of OCD (lesion> 50%), non-obstructive coronary disease (lesions <50%), or absence of coronary disease were evaluated. Results. From a population of 447 patients undergoing coronary angiography, 52 patients with negative SPECT were included in the study. The mean age was 60 years, and 67% corresponded to female patients. We observed 13 patients (25%) with OCD. Percentages of arterial anomalies were as follows: 92%, anterior descending artery; 53.8%, right coronary artery; 46.1%, circumflex coronary artery; 23%, lateroventricular coronary artery; 15.3%, posterior descending coronary artery; 7.7%, diagonal coronary artery. No lesion was found in the left coronary artery. Conclusion In our analysis, 25% of patients with negative SPECT showed significant obstructive lesions.

Objetivo. Evaluar la presencia de enfermedad coronaria obstructiva (ECO) en pacientes con SPECT negativo sometidos a Coronariografía TC64. Material y métodos. Se evaluaron pacientes sometidos a coronariografía TC con SPECT negativo desde julio 2007 a enero 2010.Se utilizó un tomógrafo Philips Brilliance 64 y contraste iodado de baja osmolaridad. Las arterias coronarias se dividieron en 16 segmentos evaluando la presencia de ECO (lesión > 50%), enfermedad coronaria no obstructiva (lesión < 50%) o sin enfermedad coronaria. Resultados. Del total de 447 pacientes, se incluyeron 52 pacientes con SPECT negativo. La edad media fue 60 años, 67% mujeres. Se observaron 13 pacientes (25 %) con ECO. Las afecciones arteriales fueron: arteria descendente anterior en el 92%, coronaria derecha 53,8%, circunfleja 46,1%, lateroventricular 23%,descendente posterior 15,3%,diagonal 7,7% y ninguna en el tronco coronario izquierdo. Conclusión. Según nuestra serie, el 25% de los pacientes con SPECT negativo presentó lesiones obstructivas significativas.

INTRODUÇÃO: A magnitude da resolução do supradesnivelamento do segmento ST é um marcador de reperfusão miocárdica em pacientes com infarto agudo do miocárdio. A resolução incompleta do supradesnivelamento do segmento ST foi identificada como preditor de resultados desfavoráveis em pacientes com infarto agudo do miocárdio após terapia de reperfusão. Este estudo teve como objetivos descrever a frequência de resolução incompleta do supradesnivelamento do segmento ST em um registro contemporâneo de pacientes submetidos a angioplastia primária e fazer uma comparação de seus resultados hospitalares com pacientes que apresentaram resolução completa do supradesnivelamento do segmento ST. MÉTODO: Entre julho de 2008 e fevereiro de 2009, foram incluídos 183 pacientes consecutivos com infarto agudo do miocárdio (< 24 horas) de oito centros na Argentina em um registro prospectivo de infarto agudo do miocárdio com supradesnivelamento do segmento ST. Resolução incompleta do supradesnivelamento do segmento ST foi definida como redução < 70% do supradesnivelamento do segmento ST no eletrocardiograma realizado 60 minutos após a angioplastia primária, em relação ao realizado no período basal. As variáveis clínicas, angiográficas e do procedimento foram analisadas, assim como o desfecho combinado de eventos cardíacos hospitalares, incluindo-se mortalidade, reinfarto, choque, complicações mecânicas e revascularização de emergência do vaso-alvo. RESULTADOS: Houve resolução incompleta do supradesnivelamento do segmento ST 60 minutos após a angioplastia em 89 pacientes (51,5%), e em 84 pacientes (48,5%) houve resolução completa. Os pacientes com reperfusão miocárdica subótima tiveram taxa mais elevada de Killip > 1 na apresentação (33,7% vs. 19%; P = 0,04), artéria descendente anterior como artéria relacionada ao infarto (52,8% vs. 30,9%; P = 0,005), e doença mais difusa na artéria relacionada ao infarto (23,6% vs. 10,7%; P = 0,008), com tendência a maior incidência de eventos cardíacos hospitalares (14,6% vs. 5,9%; P = 0,08) e de mortalidade hospitalar (11,2% vs. 3,6%; P = 0,08). A análise multivariada mostrou que presença de classe de Killip > 1 na apresentação [odds ratio (OR) 7,6; intervalo de confiança de 95% (IC 95%) 2,32-25,2; P = 0,0008] e resolução completa do segmento ST (OR 0,23; IC 95% 0,06-0,8; P = 0,02) foram preditores independentes de eventos cardíacos hospitalares. CONCLUSÕES: Apesar dos medicamentos e dispositivos disponíveis atualmente, uma quantidade bastante significativa de pacientes não obtém reperfusão completa do miocárdio após angioplastia primária, o que é expresso pela resolução incompleta da elevação do segmento ST. Esse fenômeno está associado a pior desfecho hospitalar. A presença de comprometimento hemodinâmico na apresentação, infarto anterior e doença difusa no vaso culpado está associada a reperfusão miocárdica subótima.

BACKGROUND: The magnitude of ST segment elevation resolution is a marker of myocardial reperfusion in patients presenting with acute myocardial infarction (AMI). Incomplete ST segment elevation resolution (ISTSR) was identified as a predictor of unfavorable outcomes in AMI patients after reperfusion therapy. The aims of our study were to describe the frequency of ISTSR in a contemporary registry of primary angioplasty (PCI) and compare the in-hospital outcomes with patients with complete ST segment elevation resolution (CSTSR). METHOD: From July 2008 to February 2009, we included 183 consecutive patients with AMI (< 24hs) from eight centers in Argentina to a prospective ST-segment elevation myocardial infarction (STEMI) registry. ISTSR was defined as a decrease < 70% of ST elevation between the baseline electrocardiogram and the electrocardiogram carried out 60 minutes after PCI. Clinical, angiographic and procedural related variables were analyzed, as well as a composite endpoint of in-hospital cardiac events (CE) including mortality, reinfarction, shock, mechanical complications and urgent target vessel revascularization. RESULTS: Incomplete resolution of ST-segment elevation 60 minutes after angioplasty was observed in 89 patients (51.5%) whereas complete resolution was evident in 84 patients (48.5%). Patients with suboptimal myocardial reperfusion had a higher rate of Killip class >1 at presentation (33.7% vs. 19%; P = 0.04), left anterior descending artery as the infarct related artery (52.8% vs. 30.9%; P = 0.005), and diffuse disease in the infarct related artery (23.6% vs. 10.7%; P = 0.008), with a trend towards higher incidence of in-hospital cardiac events (14.6% vs. 5.9%; P = 0.08) and in-hospital mortality (11.2% vs. 3.6%; P = 0.08). Multivariate analysis showed that the presence of Killip class >1 at presentation (OR 7.6; CI 95% 2.32-25.2; P = 0.0008) and complete ST segment resolution (OR 0.23; CI 95% 0.06-0.8; P = 0.02) were independent predictors of in-hospital cardiac events. CONCLUSIONS: In spite of the drugs and devices currently available there is a significant proportion of patients who do not achieve complete myocardial reperfusion after primary angioplasty as expressed by an incomplete resolution of ST segment elevation. This phenomenon is associated with a worse in-hospital outcome. The presence of hemodynamic compromise at presentation, anterior infarction, and diffuse disease in the culprit vessel are associated with suboptimal myocardial reperfusion.