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Nosso sistema circulatório é constituído por um amplo e complexo conjunto de vasos sanguíneos que comunicam todos os órgãos do corpo, permitindo a oxigenação e a nutrição visceral. Artérias e veias percorrem todo nosso corpo, desde a região central até a periferia, conduzindo e retornando o fluxo sanguíneo em direção ao coração, fornecendo ao ser humano um sistema circulatório integrado que trabalha de maneira cooperativa em prol do bom funcionamento corporal.

Os pulmões, o coração, os rins, o cérebro, o fígado e os demais órgãos desempenham suas respectivas funções graças à integridade do sistema circulatório. Entretanto, em situações extremas, o comprometimento da circulação pode dificultar ou até mesmo impedir que as estruturas nobres do nosso corpo exerçam sua atividade da maneira adequada, o que pode resultar em falência múltipla de órgãos.

A infecção pelo Coronavírus representa uma destas situações. A entrada do vírus em nosso organismo, especialmente em nosso aparelho respiratório, eclode uma resposta inflamatória intensa, que culmina na formação de micro e macro trombos em diferentes segmentos da nossa circulação, resultando em micro infartos orgânicos. Muitos pacientes em estado grave, por exemplo, não mantêm a função respiratória, mesmo com e ventilatório externo. Neste momento, entra em cena o sistema de “circulação artificial”, que foi recentemente utilizado no ator Paulo Gustavo.

 A “circulação artificial” é oferecida ao paciente por meio de uma terapia denominada ECMO (Oxigenação por Membrana Extracorpórea). Nesta técnica, ocorre um desvio do sangue do paciente através de um conjunto de cânulas circulatórias, que removem, oxigenam e devolvem o sangue para o corpo humano, semelhante à técnica de circulação extracorpórea utilizada em cirurgias cardiovasculares.

 Um vaso sanguíneo periférico é cateterizado e o sangue é removido do corpo e impulsionado por um bombeador até um oxigenador artificial (“pulmão artificial”), que remove o excesso de carbono do sangue, substituindo-o por oxigênio. Após este processo de oxigenação, o sangue é devolvido para o corpo humano, perfundindo os principais órgãos do nosso corpo.

A “circulação artificial pulmonar” aumenta as chances de sobrevida em casos de colapso circulatório e pulmonar. Seus principais benefícios são: (1) equilibrar a circulação de maneira rápida e eficaz; (2) oferecer tempo adicional para que ocorra a recuperação do pulmão ou do coração e (3) manter o coração e/ou o pulmão funcionando enquanto o paciente trata a causa que o levou ao uso da ECMO.

 Neste momento de fragilidade e preocupação com os efeitos virais em nossa população, mantenha os cuidados com sua saúde, evitando aglomerações, higienizando suas mãos e utilizando proteção facial com máscaras. Se houver dúvidas sobre “circulação artificial”, pandemia, Covid-19 ou temas relacionados à medicina vascular, e o site www.drsthefanovascular.com.br.

Prof. Dr. Sthefano Atique Gabriel. Doutor em Pesquisa em Cirurgia pela Faculdade de Ciências Médicas da Santa Casa de São Paulo, especialista nas áreas de Cirurgia Vascular, Angiorradiologia e Cirurgia Endovascular e coordenador do curso de Medicina da União das Faculdades dos Grandes Lagos (Unilago). 

 

 

 

 

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