Insuficiência valvar mitral isquêmica: incidência, diagnóstico e tratamento cirúrgico / The Influence of Atrial Fibrillation in the Natural History of Hypertrophic Cardiomyopathy

RESUMO

PURPOSE--To study the incidence of ischemic mitral regurgitation (MR) and the mortality. METHODS--One-hundred-five cases of acute myocardial infarction (AMI) with MR were reviewed. Patients were divided in two groups group A-59 (56.2 per cent) necropsied patients without previous surgical procedures to correlate clinical pictures with the aim to determine the cause of death; group B-46 (43.8 per cent) patients were submitted to surgical treatment. This group was subdivided in mild, moderate and severe forms of MR, and studied comparatively the type of surgical treatment and its evolution. RESULTS--Group A-23 (39 per cent) patients with mild forms and predominant ischemic heart disease, responsible for death; 18 (30.5 per cent) patients without previous diagnosis, masked by myocardial failure and 18 (30.5 per cent) with severe MR and coronary heart disease; group B-14 (30.4 per cent) patients died at the immediate post-operatory period. Higher mortality associated to ejection fraction (EF) below 35 per cent (47.6 per cent; p = 0.022), severe MR (41.7 per cent; p = 0.044) and cardiogenic shock (52.9 per cent; p = 0.14). In 41 (89.1 per cent), the mitral valve repair was combined to coronary artery bypass grafting operation (CABG), in 4 (8.7 per cent) this last procedure was made without mitral repair and in the remaining patients the surgery was limited to the valve. Mitral valvuloplasty was performed in 23 (50 per cent) patients with 3 (13 per cent) deaths, and in 19 (42.3 per cent) the mitral valve was replaced with 9 (47.4 per cent) deaths. CONCLUSION--The prognosis is related to the grade of EF and to the severity of MR. In mild to moderate forms, the surgical indication is due to the associated coronary heart disease and the valvuloplasty is preferred, in this instance. In severe forms, surgical intervention must be performed as soon as possible, before cardiogenic shock appears