Biofeedback regulation of ultrafiltration and dialysate conductivity for the prevention of hypotension during hemodialysis.

Intradialytic hypotension remains a frequent complication of dialysis, occurring in up to 33% of patients. We tested a fully integrated biofeedback system (the Hemocontrol system) that monitors and regulates blood volume contraction during hemodialysis. Seven hypotension prone patients were selected for the study. We conducted a prospective crossover study alternating dialysis sessions using the blood volume regulation system and standard dialysis sessions. Event free sessions were defined as dialysis sessions not requiring any therapeutic intervention for hypotension related signs or symptoms. There was a significant improvement in the number of event free sessions with blood volume regulation compared with standard dialysis (50.8% of sessions vs. 29.2%; p < 0.01). Percentages of event free sessions and mean postdialysis systolic blood pressure improved progressively over the course of the study, indicating improved hemodynamic stability over the study period. Therefore, the use of a biofeedback system to monitor and regulate blood volume during dialysis was helpful in restoring cardiovascular stability in a population of hypotension prone hemodialysis patients. Further studies are needed to confirm these preliminary results and to establish the role of blood volume regulation systems in reducing the incidence of hypotension during hemodialysis.