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The Influence of Posture on Spirometric Values in Grade III Obese Patients

The change from the sitting position to supine position, general anesthesia, and surgical procedure reduce lung volumes and this effect can be greater in obese patients. The objective of the present study was to evaluate the influence of the sitting position, 30 dorsal inclination, and horizontal do...

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Published in:Revista brasileira de anestesiologia 2011-11, Vol.61 (6), p.713-719
Main Authors: Teixeira, Ayrton Bentes, Mathias, Ligia Andrade da S. Telles, Saad Junior, Roberto
Format: Article
Language:English
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Summary:The change from the sitting position to supine position, general anesthesia, and surgical procedure reduce lung volumes and this effect can be greater in obese patients. The objective of the present study was to evaluate the influence of the sitting position, 30 dorsal inclination, and horizontal dorsal decubitus on spirometry of grade III obese patients. Twenty-six adult patients in the preoperatory period were selected according to the following criteria: BMI>40kg.m−2, age between18 years and 60 years, and female gender. Variables analyzed included: age, weight, height, BMI, percentage of predictive values of FVC, FEV1, and VEF1/FVC in the sitting position (90°), 30° dorsal elevation, and horizontal dorsal decubitus (0°). ANOVA, followed or not by Tukey test were used to compare mean predicted values on the different positions, considering significant a p value lower than 0.05. Percentage values of FVC, FEV1, and FEV1/FVC ratio regarding predicted values in the sitting position (90°), 30° dorsal elevation, and horizontal dorsal decubitus (0°), and p value of the corresponding statistical analysis were, respectively: FVC=92.8%, 88.2%, and 86.5%, p=0.301 (ANOVA); FEV1: 93.1%, 83.8%, and 83.3%, p=0.023 (ANOVA), p=0.038 (Tukey test – 90°×0°); FEV1/FVC: 100,8%, 95.5%, and 96.8%, p=0.035 (ANOVA), p=0.035 (Tukey test – 90°×30°). Changes in position produced changes in spirometry results of patients with grade III obesity. A mudança de posição sentada para a posição supina, a anestesia geral e o procedimento cirúrgico reduzem os volumes pulmonares, e esse efeito pode ser maior nos obesos. O objetivo deste estudo foi avaliar a influência das posições sentada, inclinação dorsal de 30° e decúbito dorsal horizontal na espirometria de doentes portadores de obesidade grau III. Foram selecionados 26 pacientes adultos no período pré-operatório, obedecendo aos seguintes critérios de inclusão: portadores de IMC>40kg.m−2, maiores de 18 e menores de 60 anos e gênero feminino. As variáveis analisadas foram: idade, peso, altura, IMC, porcentagens dos valores preditos da CVF, VEF1 e VEF1/CVF nas posições sentada (90°), com elevação dorsal de 30° e decúbito dorsal horizontal (0°). A comparação entre as médias dos valores previstos nas diversas posições foi realizada por meio do teste de ANOVA, seguido ou não do teste de Tukey, sendo considerado significativo valor de p inferior a 0,05. Os valores das porcentagens da CVF, do VEF1 e da relação VEF1/CVF em relação aos valores prev
ISSN:0034-7094
1806-907X
DOI:10.1016/S0034-7094(11)70080-0