Simulação in vitro da aspiração endotraqueal correlacionando pressão de vácuo, diâmetro do cateter e diferentes propriedades viscoelásticas para o muco respiratório

Detalhes bibliográficos
Ano de defesa: 2015
Autor(a) principal: Maria das Dores Cabral Ortis
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/BUBD-A9CJ4T
Resumo: Endotracheal suctioning is a necessary procedure to prevent airway obstruction for individuals in acute, severe or chronic disease, unable to keep clean your airway. The relationship between suction pressure, diameter of the catheter and its efficacy is not completely understood. Therefore an in vitro study was performed to relate suction pressure, diameter of the suction catheter, and amount of mass withdraw for three substances mucus simulant. An ARG2 rheometer (TA instruments) was used to permit the formulation and characterization of substances like a normal lung fluid, semifluid, and substances like secretions in pathological, semi-solid and intermediate stages, composed of locust bean gum and borax solutions. The negative pressures from the relationship between suction catheter and suction pressure were measured. The tests were performed for a 8mm endotracheal tube. 8, 10, 12, 15 and 16 Fr catheters were connected to vacuum at three different pressures: 100, 150 and 200 mmHg and the amount of the substance aspirated in each test situation was weighed. At 200 mmHg vacuum, a 14 Fr suction catheter can attain 2.38 mmHg with low potential for generating excessive intrapulmonary pressures in an 8mm endotracheal tube. The removal of 3.2g of substance, when considered three repetitions of the procedure, was satisfactory. A satisfactory amount of semifluid substance was aspirated for all combinations of vacuum applied pressure and catheter diameter. The intermediate substance was aspirated satisfactorily for 150 and 200 mmHg suction pressure using the 12 Fr catheter. A appropriate amount of semi-solid substance was aspirated for the 14 Fr catheter and 200 mmHg vacuum. The results suggest that increasing the vacuum while maintaining the same catheter diameter is safer and more effective than to increase the diameter to the next larger catheter.