Sistema simples com eletrodos capacitivos para monitoramento da frequência cardíaca através de contato indireto
DOI:
https://doi.org/10.29384/rbfm.2019.v13.n2.p47-52Keywords:
bioeletricidade, sistemas embarcados, eletrocardiograma, eletrodos capacitivosAbstract
O monitoramento contínuo do eletrocardiograma (ECG) permite um melhor entendimento da saúde cardíaca dos pacientes, a detecção precoce de patologias e um rápido alerta emergencial em condições agudas. Entretanto, essa prática normalmente está associada ao uso de eletrodos adesivos e holters, que a longo prazo podem causar irritações e reações alérgicas na pele, além de desconforto ao paciente. Este trabalho apresenta um sistema embarcado para aquisição de ECG multicanal e monitoramento da frequência cardíaca, usando eletrodos capacitivos projetados para operar sem gel e sem contato direto com a pele do paciente. Quatro eletrodos foram fixados em linha sobre um colchonete, para monitoramento do paciente em decúbito. Assim que o paciente se deita sobre o colchonete, o ECG é medido através das roupas e sem nenhuma preparação. O objetivo é desenvolver uma ferramenta de saúde ubíqua para o monitoramento residencial e hospitalar, que ofereça segurança e conforto aos pacientes. Resultados em paciente eletrônico mostram correlação de 90,8% entre o sinal de ECG gerado e o medido. Resultados experimentais em voluntários mostram um erro percentual de frequência cardíaca de até 2,3% para decúbito ventral e 6,8% para decúbito dorsal, em relação a valores obtidos simultaneamente usando um oxímetro digitalDownloads
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