Impacto do cronotipo na qualidade de vida de pacientes renais crônicos submetidos a tratamento hemodialítico

Introduction: The chronotype has impact on cognitive and physical performance, what may also influence the quality of life (QOL) of patients with chronic kidney disease (CKD). Objective: To evaluate the chronotype of patients with CKD undergoing hemodialysis and to analyze QOL according to this chronotype and the schedule of hemodialysis realization. Materials and Methods: Cross-sectional, analytical and descriptive study approved by the research ethics committee. To characterize the chronotype the Morningness-Eveningness Questionnaire (MEQ) was applied and to evaluate QOL  e have used the Brazilian Version of the Quality of Life Questionnaire - SF36, and the Quality of Life Questionnaire for Chronic Kidney Patients - SF-KDQOL. Results: Were included 80 patients, being 49 male, average age of 59.3±13.4 years old, and an average of time of hemodialysis treatment of 27.5 months. Regarding the chronotype, 68 (85%) patients were classified as morning, 12 (15%) as intermediaries and none as evening. It was observed a significant reduction in the QOL of patients with intermediate chronotype in the functional capacity domain (p=0.05) of SF-36 and in the domains effects of the disease (p<0.01), social support (p=0.02) and physical function (p=0.05) of KDQOL-SF. The QOL was also reduced in the aspect related to physical composition (p=0.05) of KDQOL-SF in patients with intermediate chronotype who performed hemodialysis at 7:00 am compared to the group from 10:30 am. Conclusion: Most patients with CKD undergoing hemodialysis have their chronotype rated morning. The morning patients versus intermediaries have better QOL.