RESUMO
BACKGROUND: ß-Blockers are the most frequently prescribed cardioprotective drugs in hemodialysis (HD) patients, despite their weak evidence. We sought to evaluate the effects of ß-blockers on vascular refilling during HD treatments and examine whether carvedilol, for being noncardioselective and poorly dialyzable, associates more impact than others. METHODS: The study was performed in a cohort of maintenance HD patients from a tertiary center. All patients had previous ß-blocker prescription. We conducted a prospective crossover study and measured vascular refilling volume (Vref) and vascular refilling fraction (Fref) in 2 circumstances: under ß-blocker treatment (ßb profile) and without ß-blocker effect (non-ßb profile). RESULTS: Twenty patients were included, 10 of whom were treated with carvedilol. Predialysis values were comparable between the 2 profiles. Although the ßb profile showed lower Vref and higher ABV drop, these differences did not reach statistical significance. Data showed an increase in Fref in the non-ßb profile (70.01 ± 6.80% vs. 63.14 ± 11.65%; p = 0.015). The ßb profile associated a significantly higher risk of intradialytic hypotension (IDH) (risk ratio 2.40; 95% CI: 1.04-5.55). When analyzing separately the carvedilol group, patients dialyzed under drug effect experienced a significant impairment in Vref, Fref, and refilling rate. CONCLUSIONS: Administering ß-blockers before HD associated a higher risk of IDH and a decrease in Fref. Patients dialyzed under carvedilol effect showed an impaired refilling, probably related to its noncardioselectivity and lower dializability.
