Heart rate variability during hemodialysis in two ultrafiltration profiles

Abstract

The aim of this study was to analyze the behavior of the autonomous nervous system (ANS) using heart rate variability in a hemodynamic stable patients group, during hemodialysis (HD), two different ultrafiltration profiles, the first gradual increasing ultrafiltration rate (UF1) and the other gradually decreasing ultrafiltration rate (UF2). In nine patients haemodinamically stables (28 ± 8 years), we take EKG in lead II simultaneously HD, during three hours, the signal was process to obtain the tachogram and using the Welch method for spectral analysis. Results showed that all cases presented greater power in the Low frequencies (LF) band compared to the power in High frequencies (HF) band, this result was consistent with the activation of Sympathetic Nervous System (SNS) in response to the proper function of the baroreceptor regulation. Using a power spectral density to analyses, no differences was found between average values of LF/HF balance, using a UF1 (4.19 ± 1.7553) or UF2 (4.92 ± 2.9953) (p = 0.5407) in this group. Ultrafiltration profile was indifferent for this haemodinamically stable patients group.