OBJETIVO: Monitoramento do tronco cerebral através da análise dos traçados do BERA em cirurgia cardíaca com hipotermia profunda e parada circulatória total (PCT), registrando a recuperação funcional (eletrofisiológica) do tronco cerebral. FORMA DE ESTUDO: Coorte Longitudinal. MATERIAL E MÉTODO: Foram estudados o comportamento do traçado do BERA de 8 pacientes submetidos a cirurgia cardíaca com hipotermia profunda e PCT para correção de aneurisma de aorta torácica. Etapas: resfriamento corporal até 18ºC C; PCT por até 60 minutos; reaquecimento. Registros do BERA: 35ºC, 32ºC, 26ºC, 18ºC, 27ºC, 35ºC. RESULTADOS: Os traçados iniciais (35ºC) se apresentavam normais. Aos 26ºC há o desaparecimento de todas as ondas. Aos 18ºC o traçado do BERA mostrava um padrão isoelétrico. Aos 27ºC, recuperação das ondas I, III e V. A partir de 35ºC as latências das ondas retornam ao normal. CONCLUSÃO: O BERA constitui-se em competente instrumento de monitoramento da integridade funcional do tronco cerebral em cirurgia cardíaca com hipotermia profunda e PCT. As ondas desaparecem no período de resfriamento corporal, atingem um padrão isoelétrico a 18ºC, e reaparecem durante o reaquecimento. No final do procedimento, os médicos anestesistas não dispõem de exame clínico fidedigno para acessar a integridade funcional do tronco cerebral, devido ao uso de drogas depressoras do SNC. O reaparecimento das ondas do BERA é o parâmetro proposto para este fim. A manutenção do padrão isoelétrico após o reaquecimento corporal sugere grave comprometimento funcional do tronco cerebral.
The new cavity created after an open cavity tympanomastoidectomy (OCTM) is filled with an antibiotic impregnated cotton pack (cotton tape, umbilical tape, gauze). The removal of this pack usually causes some bleeding and discomfort for the patient. We propose the use of a latex biomembrane to cover the cavity, which will act as an interface between the raw bone surface and the packing. Study design: clinical prospective. Aim: To study the performance of the latex biomembrane as an interface between the raw bone surface and the pack, and to analyze its role in cavity epithelization. Material and Methods: 64 ears of patients submitted to OCTM were studied. The biomembrane was used in the packing of 54 ears and in the 10 remaining ears the regular cotton tape packing was used. Results: In the majority of the cases where the biomembrane was used the packing was removed much easier with no bleeding or pain for the patient and also showed an earlier cavity epithelization. Conclusion: The use of the latex biomembrane has proven to be an effective method to cover the mastoid cavity facilitating epithelization and removal of mastoid cavity packing.
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