Hemodynamic, urea, and kalemia variations during and after hemodialysis. Mean arterial pressure (a) and norepinephrine infusion rate (b) at the start (D0), the end (endD), and 3 hours (postD3) after hemodialysis. Values are expressed as mean ± SEM. Urea (c) and kalemia (d) at the start, the end, 1 hour, and 3 hours after hemodialysis, D0, end D (clear), postD1 and postD2 (dark), respectively. Values are expressed in boxplots. *P < 0.05; Friedman test.