Avaliação das pressões respiratorias maximas em pacientes renais cronicos submetidos a hemodialise / Evaluation of maximum respiratory pressures in chronic renal patients undergoing hemodialysis

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

BACKGROUND AND OBJECTIVES: Maximal inspiratory and expiratory pressures (PImax e PEmax) are used to evaluate the integrity of respiratory muscles by measuring their strength. The effects of hemodialysis on these variables in chronic renal failure (CRF) patients are not yet well established in the literature. The objective of this study was to evaluate the influence of hemodialysis on PImax and PEmax values. METHODS: A prospective, transversal study was done in a convenience sample of 35 CRF patients (26 men and 9 women), aged between 21 and 81 years, at the Nephrology Division of the Alzira Vellano University Hospital of Alfenas/MG/Brazil. The patients had their PImax and PEmax taken in the seated position (at 90°) by using a digital manovacuometer (MVD 300®) attached to a notebook for reading and recording data obtained before and after the hemodialysis session. RESULTS: PImax and PEmax were found to be lower than those predicted at any moment (pre- and post-hemodialysis) (p<0.0001). By comparing the values obtained pre-hemodialysis with those observed post-hemodialysis, PImax showed a slight improvement (p=0.0420), particularly in those patients with pre-hemodialysis values lower than 60 cmH2O (Wilcoxon; p=0.0480). PEmax values post-hemodialysis were not different from those observed pre-hemodialysis (p=0.4987). CONCLUSION: CRF patients have serious impairment of their respiratory muscle function, and only one isolated hemodialysis session was not able to significantly improve their maximal respiratory pressures, except for a light improvement of inspiratory strength observed in those who had presented a PImax lower than 60 cmH2O before the procedure

ASSUNTO(S)

respiratory mechanics hemodialise chronic renal failure mecanica respiratoria muscular strength insuficiencia renal cronica hemodialysis força muscular

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