Infarto agudo de miocardio en mujer joven con diagnóstico de lupus eritematoso sistémico / Acute myocardial infarction in a young woman with systemic lupus erythematosus

Resumen Se presenta un caso de infarto agudo de miocardio con elevación del segmento ST en una paciente de 22 años de edad, con LES, HTA y nefropatía a la cual se le realizó angioplastia coronaria exitosa a tercio medio de arteria descendente anterior. Evolucionó sin signos de insuficiencia cardiaca, sin embargo, debido al retraso en el diagnóstico presentó deterioro grave de la función ventricular. El infarto agudo de miocardio con elevación del ST es un evento muy poco frecuente en mujeres pre menopáusicas pero, en comparación con la población general las pacientes con lupus eritematoso sistémico presentan al menos un 50% más de riesgo de padecerlo independientemente de la edad. En esta población, las etiologías más frecuentes son la vasculitis, la aterosclerosis precoz y la trombosis secundaria a síndrome antifosfolipídico. A su vez, en contexto de lupus, se han descripto condiciones como la presencia de nefritis lúpica, que favorecen aún más a la aparición del infarto de miocardio, constituyendo subgrupos de mayor riesgo. El incremento del riesgo de IAM en los pacientes con LES debe tenerse en cuenta y hay que sospechar como diagnóstico diferencial del dolor precordial aún en mu jeres jóvenes, incluso menores de 25 años, población categorizada como de bajo riesgo cardiovascular según los scores y criterios tradicionales. Esto evitaría las demoras en el diagnóstico y tratamiento con consecuencias pronósticas adversas como la necrosis miocárdica extensa y su impacto negativo sobre la función sistólica ventricular como ocurrió en esta paciente.

Abstract We repor a case of acute ST elevation myocardial infarction in a 22-year-old patient with SLE, hypertension and nephropathy who underwent successful coronary angioplasty to a middle third of the left an terior descending artery. She evolved without signs of heart failure however, due to the delay in diagnosis, she presented severe deterioration of ventricular function. ST segment elevation myocardial infarction is a very rare event in young premenopausal women, but compared to the general population, patients with lupus have at least a 50% higher risk of suffering it regardless their age. In this population, the most frequent causes are vasculitis, early atherosclerosis and secondary thrombosis to antiphospholipid syndrome. In the context of lupus, conditions such as the presence of nephritis have been described as favoring the appearance of myocardial infarction, constituting subgroups of higher risk. The increased risk of AMI in patients with SLE must be taken into account and must be suspected as a differential diagnosis of precordial pain in young women, even those under 25 years of age, a population categorized as having low CV risk according to traditional scores. This would avoid delays in diagnosis and treatment with adverse consequences such as extensive myocardial necrosis and its impact on ventricular systolic function, as occurred in this patient.

Sin elevación, también puede haber oclusión / Without elevation, there may also be occlusion

Resumen Ante un dolor torácico agudo y evidencia de elevación del segmento ST, se debe instaurar un tratamiento de reperfusión urgente, con el objetivo de abrir la arteria ocluida y minimizar el daño miocárdico y, así, mejorar el pronóstico del paciente. Por ello, es necesario conocer aquellos patrones eléctricos de alto riesgo equivalentes a una elevación del segmento ST e indicativos de una oclusión coronaria aguda, para evitar que se produzca una demora inadmisible en los tiempos de actuación, tal y como ocurrió en el caso que se presenta.

Abstract In light of an acute chest pain and evidence of ST-segment elevation, an emergent reperfusion treatment should be started with the objective of opening the occluded artery and reducing myocardial damage, thus, improving the patients´s prognosis. Therefore, it is mandatory to keep in mind those high-risk electrical patterns equivalent to a ST-segment elevation and indicative of an acute coronary occlusion to avoid an unacceptable delay in the times of action, such was the case that is reported.

In silico evaluation of the acute occlusion effect of coronary artery on cardiac electrophysiology and the body surface potential map

Body surface potential map, an electric potential distribution on the body torso surface, enables us to infer the electrical activities of the heart. Therefore, observing electric potential projected to the torso surface can be highly useful for diagnosing heart diseases such as coronary occlusion. The BSPM for the heart of a patient show a higher level of sensitivity than 12-lead ECG. Relevant research has been mostly based on clinical statistics obtained from patients, and, therefore, a simulation for a variety of pathological phenomena of the heart is required. In this study, by using computer simulation, a body surface potential map was implemented according to various occlusion locations (distal, mid, proximal occlusion) in the left anterior descending coronary artery. Electrophysiological characteristics of the body surface during the ST segment period were observed and analyzed based on an ST isointegral map. We developed an integrated system that takes into account the cellular to organ levels, and performed simulation regarding the electrophysiological phenomena of the heart that occur during the first 5 minutes (stage 1) and 10 minutes (stage 2) after commencement of coronary occlusion. Subsequently, we calculated the bipolar angle and amplitude of the ST isointegral map, and observed the correlation between the relevant characteristics and the location of coronary occlusion. In the result, in the ventricle model during the stage 1, a wider area of ischemia led to counterclockwise rotation of the bipolar angle; and, during the stage 2, the amplitude increased when the ischemia area exceeded a certain size.

Aspiration Thromboembolectomy in the Management of Acute Coronary Occlusion during Pertaneous Transluminal Coronary Angioplasty

Percutaneous transluminal coronary angioplasty (PTCA) is often used in the management of coronary artery disease and the advances in equipment, technichal skill and acquisition of operator experiences have improved initial success rates and reduced the frequency of complications. However, acute coronary occlusion is the most common and serious complication related to angioplasty and its several potential mechanisms are intracoronary thrombus, coronary artery spasm and coronary artery dissection. Accordingly,heparinization, intracoronary thrombolysis, re-PTCA, stent implantation and emergency coronary artery bypass grafting have been previously used for reopening of an occluded coronary artery during angioplasty. In this report we describe our experience in the management of acute coronary occlusion of left anterior descending artery caused by dislodgement of thrombotic material during PTCA by means of aspiration thromboembolectomy instead of medical therapy,re-PTCA and stent implantation.