Resultados hemodinamicos e eletrofisiologicos da correção cirurgica do aneurisma pos-infarto do ventriculo esquerdo

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Left ventricular aneurysm is one of the most frequent and most serious complications following acute myocardial infarction. When present it reduces long term survival and affects quality of life with symptoms related to angina, heart failure and arrythmias. Surgery has been a therapeutical option for the more severe cases of left ventricular aneurysm since the late 50 s. The results have improved with time but only since the mid 80 s, with conceptual modifications being introduced in the surgical correction of these lesions, have the best results been achieved, with low hospital mortality and good functional improvement. There are, however, few publications analysing hemodynamic variables for left ventricular function to substantiate the reports of clinical improvement. Therefore we decided to study hemodynamic and electrophysiologial modifications in the early postoperative (one month) and late postoperative (one year) period of 206 patients treated surgically for post-infarction left ventricular aneurysms. The hemodynamic variables of left ventricular function showed significant improvement with surgical treatment. H oweve r, cardiac index and pulmonary artery pressure.s remained unchanged. The electrophysiological data showed that surgical treatment was efficient in preventing ventricular arrythmias in 90% of the patients. Our -results compared favorably with those previously published, demonstrating that the concept of left ventricular reconstruction produces improved left ventricular function when compared to conventional aneurysmectomy. In the late postoperative period our hemodynamic data showed significant deterioration of ali parameters of left ventricular function when compared to the early postoperative period. H oweve r, they remained significantly improved in comparison to preoperative values. The study population was divided into three groups according to the surgical variant used for .Ieft ventricular reconstruction. Hemodynamic and electrophysiological data were analysed for each of the groups separately a,nd then the three groups were compared to each other. Electrophysiological data revealed similar and sígníficant improvement ín ali three groups. Hemodynamic data revealed a more significant improvement in the group where a Dacron@ path was used for left ventricular reconstruction. We also used logistic regresion analysis to look for preoperative, intraoperative or postoperative clínical or hemodynamic variables that could influence hospital mortality or long term left ventricular performance. We found that preoperative mitral valve insuficiency and the need for intra-aortic baloon pump for circulatory assistance were independent risk factors for mortality. Our model also showed that postoperatíve mitral valve insuficíency and largely increased preoperative left ventricular díastolic volume index were independent risk factors for poor long term left ventricular performance

ASSUNTO(S)

aneurisma coração - ventriculo esquerdo

ACESSO AO ARTIGO

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