ABSTRACT
Background: Cardiovascular disease (CVD) is the number one cause of death worldwide. In India almost 30,000 people suffer an acute myocardial infarction (AMI) each year and, despite the greatly improved survival after AMI, CVD remains the leading cause of death among women and men. During the last decade, there has been increasing awareness of the significant minority of patients with acute myocardial infarction, for whom invasive coronary angiography (ICA) does not show any coronary artery stenoses. This condition is called myocardial infarction and non-obstructed coronary arteries (MINOCA) and is still incompletely understood. Aim of the study: To investigate whether patients with MINOCA had a greater coronary plaque burden determined by coronary CTA than a control group matched by age and gender. Materials and methods: Totally 100 patients were included in the study Patients presenting to the department of cardiology, SRM Medical College Hospital and Research Institute Kattangulathur, Kanchipuram District, Chennai with an ACS between January 2018 to May 2019. In the first step, patients with MINOCA were screened for the SMINC study Patients were eligible to take part in the study if they were between 35 and 70 years old, fulfilled the criteria for acute myocardial infarction (AMI) according to the universal definition of AMI and underwent ICA showing no or minimal signs Venkatesh Munusamy, Veeraraghavan Sriram, Dhandapani Vellala Elumalai. Coronary computed tomography angiography in patients with myocardial infarction and non-obstructed coronary arteries. IAIM, 2019; 6(8): 18-25. Page 19 of atherosclerosis (defined as the presence of plaque discernible on ICA, but no stenosis exceeding 30% by visual estimation). All patients also underwent cardiovascular magnetic resonance (CMR) imaging at a median of 12 days after hospital admission. Results: MINOCA patients did not have more CAD than healthy controls, matched by age and gender. A large proportion of MINOCA patients had no signs of CAD at coronary CTA. Conclusion: Thus, MINOCA should not be considered a definitive diagnosis, but rather a working diagnosis, warranting additional diagnostic evaluation. Myocarditis is one of the conditions that may manifest itself as MINOCA. Findings of the SMINC study, where myocarditis was excluded by CMR, suggest that TS is an important cause of MINOCA. Other potential causes include CAD with rupture of a non-stenotic lesion, coronary artery spasm, thrombotic disorders, and microvascular dysfunction.
ABSTRACT
Takotsubo es una miocardiopatía adquirida que se caracteriza por la aparición transitoria de acinesia o discinesia antero-apical del ventrículo izquierdo, síntomas y cambios electrocardiográficos que simulan un síndrome coronario agudo, leve elevación de enzimas cardíacas y coronarias sin lesiones ateroscleróticas significativas. Afecta predominantemente a mujeres post menopáusicas y frecuentemente es precedido por situaciones de estrés físico o psicológico. La fisiopatología no ha sido completamente dilucidada pero existe consenso sobre el papel central de la descarga masiva de catecolaminas, secundaria a dichas situaciones de estrés, como mecanismo desencadenante. Se presentan 32 casos diagnosticados en tres instituciones de Córdoba. La edad promedio fue 61 años, el 28 (88%) fueron mujeres, y todos se presentaron simulando síndromes coronarios agudos. Doce pacientes (37.5%) evolucionaron con insuficiencia cardíaca y dos (6%) desarrollaron shock cardiogénico. La función ventricular se normalizó más rápidamente que los cambios electrocardiográficos. La tasa de recurrencia fue del 25%. El pronóstico fue benigno, ya que solo se produjo una muerte como consecuencia de una recidiva. Estos hallazgos son, en general, similares a los publicados en la literatura. También se analizaron recientes progresos sobre la fisiopatología de esta miocardiopatía que permitieron desarrollar un planteo racional de tratamiento.
Takotsubo Syndrome is an acquired cardiomyopathy characterized by a transient left ventricular antero-apical asynergy or disynergy (apical ballooning), symptoms and electrocardiographic changes are suggestive of an acute coronary syndrome, moderate cardiac enzymatic release and absence of significant atherosclerotic lesions in coronary arteries. It predominantly affects postmenopausal women and it is frequently preceded by situations of physical or psychological stress. The physiopathology is not completely understood but there is consensus that it is triggered by a surge of catecholamines consequent to the aforementioned stress conditions. The study of 32 cases diagnosed at three medical institutions in Córdoba, Argentina, is reported. The mean age was 61 years, and 28 were female. All cases simulated acute coronary syndromes. Congestive heart failure developed in twelve cases (37.5%) and two patients (6.3%) developed cardiogenic shock. The left ventricular function normalized more rapidly than the electrocardiographic changes. The recurrence rate was 25%, the prognosis was benign considering that only one death occurred following a relapse. In general the findings are similar to previously published studies. Recent advances in the comprehension of the physiopathology of this cardiomyopathy gave way to the development of a rational therapeutic approach.