Comparação da resistência imposta pelos filtros artificiais durante a ventilação mecânica

Denise Cardoso Ribeiro, Célia Regina Lopes, Roberta Zancani de Lima, Yara Cordeiro do Nascimento Teixeira

Resumo


Introdução: Os filtros trocadores de calor e umidificadores (HMEs) higroscópicos, hidrofóbicos e mistos, que exercem as funções das vias aéreas superiores na ventilação mecânica, podem promover aumento da resistência no circuito aumentando o trabalho respiratório do paciente. O objetivo deste estudo foi comparar a resistência imposta entre os filtros higroscópico (Medsize) e misto (Gibeck) ao sistema respiratório artificial, durante a assistência ventilatória mecânica. Método: Os filtros da marca Medsize e Gibeck foram testados entre o intermediário Y e o balão de teste, sendo analisada a pressão antes (Pmax) e após cada filtro, com diferentes fluxos e quantidade de solução salina a 0,9%. Resultados: Observou-se resistência em ambos os filtros com aumento de no mínimo 1 cmH2O. O filtro da marca Gibeck apresentou maior resistência, 10 cmH2O, em relação ao filtro da marca Medsize, 5 cmH2O. Conclusão: Os filtros conectados ao circuito ventilatório artificial apresentaram aumento de resistência relacionado com o incremento de instilação de solução salina a 0,9% e com maiores valores de fluxo.

Palavras-chave


Respiração artificial; instrumentação

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