168 research outputs found
Características da estimulaçao de enxertos musculares utilizados na assistência circulatória
Na cardiomioplastia e na assistência biomecânica, enxertos musculares esqueléticos, estimulados artificialmente em sincronia com o coraçao, sao utilizados como substitutos da funçao miocárdica. Neste trabalho sao analisados os parâmetros eletrofisiológicos envolvidos na estimulaçao muscular esquelética, bem como as características dos sistemas de estimulaçao atualmente empregados na cardiomioplastia. No Instituto do Coraçao, em estudo experimental em caes, observou-se a importância de realizaçao de séries de pulso e de valores da energia de estimulaçao superiores ao limiar de força máxima, para a obtençao de uma contraçao eficiente do enxerto muscular, aguda e cronicamente. Paralelamente, a experiência obtida com a utilizaçao da cardiomioplastia no tratamento de 12 pacientes portadores de cardiomiopatia dilatada, mostrou a necessidade de níveis de energia elevados na estimulaçao crônica dos enxertos musculares, com o emprego de eletrodos de implantaçao intra-muscular justa-neural. Destaca-se ainda a importância da manutençao de um intervalo de sincronizaçao adequado entre a contraçao muscular esquelética e a contraçao miocárdica, para a obtençao de um aumento da contratilidade das câmaras ventriculares na cardiomioplastia
Evolução a longo prazo e complicações da hipertensão arterial após transplante cardíaco
Ação da cardioplegia na proteção miocárdica: estudo experimental através das réplicas de criofraturas
Comparison of coronary-artery bypass surgery and stenting for the treatment of multivessel disease
BACKGROUND: The recent recognition that coronary-artery stenting has improved the short- and long-term outcomes of patients treated with angioplasty has made it necessary to reevaluate the relative benefits of bypass surgery and percutaneous interventions in patients with multivessel disease. METHODS: A total of 1205 patients were randomly assigned to undergo stent implantation or bypass surgery when a cardiac surgeon and an interventional cardiologist agreed that the same extent of revascularization could be achieved by either technique. The primary clinical end point was freedom from major adverse cardiac and cerebrovascular events at one year. The costs of hospital resources used were also determined. RESULTS: At one year, there was no significant difference between the two groups in terms of the rates of death, stroke, or myocardial infarction. Among patients who survived without a stroke or a myocardial infarction, 16.8 percent of those in the stenting group underwent a second revascularization, as compared with 3.5 percent of those in the surgery group. The rate of event-free survival at one year was 73.8 percent among the patients who received stents and 87.8 percent among those who underwent bypass surgery (P<0.001 by the log-rank test). The costs for the initial procedure were 2,973 per patient. CONCLUSION: As measured one year after the procedure, coronary stenting for multivessel disease is less expensive than bypass surgery and offers the same degree of protection against death, stroke, and myocardial infarction. However, stenting is associated with a greater need for repeated revascularization
Dez anos de cirurgia dos aneurismas e dissecções crônicas da aorta ascendente no Instituto do Coração - FMUSP
Hemólise em circulação extracorpórea: estudo comparativo entre bomba de rolete e bomba centrífuga
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