Patients’ perception of health on renal replacement therapy: evaluation using a new instrument

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Abstract
Patients’ perception of their health is an important outcome measure in the management of chronic disease. Comparing that perception from patients receiving different forms of renal replacement therapy (RRT) with data from the general population could be used to monitor the effectiveness of treatment. The short form 36 (SF-36) questionnaire is a general measure of health status which has been validated in the UK and uses eight health scales comprising physical function, social function, role limitation (physical and emotional), mental health, energy, pain and overall health. Using the SF-36 questionnaire, the perception of health of patients receiving RRT was compared with data from healthy control subjects. One hundred and seventy-two of 185 (93%) patients receiving RRT—transplant (n=102), haemodialysis (n=43), and peritoneal dialysis (n=27) completed the questionnaire; scores were compared with those from 542 healthy control subjects. The perception of health of haemodialysis and peritoneal dialysis patients was significantly worse than transplanted patients and controls in six of the eight scales (PP<0.05). Patients were also stratified into low, medium, and high-risk groups based on age and comorbidity and were analysed irrespective of treatment modality. Scores were significantly different across the risk groups in five of the eight scales. We conclude that the SF-36 questionnaire is acceptable to patients on RRT and enables the perception of health of patients receiving RRT to be compared with that of the general population. It discriminates between transplanted patients and those receiving dialysis and between patients with varying degrees of comorbidity. This questionnaire may also be useful in monitoring the effect of changes in different types of RRT over time.

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