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Echocardiographic evaluation during weaning from mechanical ventilation

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Echocardiographic evaluation during weaning from mechanical ventilation

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Título Echocardiographic evaluation during weaning from mechanical ventilation
Autor Schifelbain, Luciele Medianeira Oliveira
Vieira, Silvia Regina Rios
Brauner, Janete Salles
Pacheco, Deise Mota
Naujorks, Alexandre Antonio
Abstract INTRODUCTION: Echocardiographic, electrocardiographic and other cardiorespiratory variables can change during weaning from mechanical ventilation. OBJECTIVES: To analyze changes in cardiac function, using Doppler echocardiogram, in critical patients during weaning from mechanical ventilation, using two different weaning methods: pressure support ventilation and Ttube; and comparing patient subgroups: success vs. failure in weaning. METHODS: Randomized crossover clinical trial including patients under mechanical ventilation for more than 48 h and considered ready for weaning. Cardiorespiratory variables, oxygenation, electrocardiogram and Doppler echocardiogram findings were analyzed at baseline and after 30 min in pressure support ventilation and T-tube. Pressure support ventilation vs. T-tube and weaning success vs. failure were compared using ANOVA and Student’s t-test. The level of significance was p,0.05. RESULTS: Twenty-four adult patients were evaluated. Seven patients failed at the first weaning attempt. No echocardiographic or electrocardiographic differences were observed between pressure support ventilation and Ttube. Weaning failure patients presented increases in left atrium, intraventricular septum thickness, posterior wall thickness and diameter of left ventricle and shorter isovolumetric relaxation time. Successfully weaned patients had higher levels of oxygenation. CONCLUSION: No differences were observed between Doppler echocardiographic variables and electrocardiographic and other cardiorespiratory variables during pressure support ventilation and T-tube. However cardiac structures were smaller, isovolumetric relaxation time was larger, and oxygenation level was greater in successfully weaned patients.
Contido em Clinics. Sao Paulo. Vol. 66, no. 1 (Jan. 2011), p. 107-111
Assunto Desmame do respirador
Ecocardiografia
Ecocardiografia Doppler
Respiração artificial
[en] Artificial ventilation
[en] Cardiorespiratory variables
[en] Doppler echocardiogram
[en] Echocardiography
[en] Ventilator weaning
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/49798
Arquivos Descrição Formato
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