Trial of Variable Dialysate Bicarbonate

"Assess how a lower dialysate bicarbonate affects:~* QTc duration during and between hemodialysis sessions~* PVC burden during and between hemodialysis sessions~* Clinically significant arrhythmia during and between hemodialysis sessions~* Intradialytic hypotension~* Adverse symptoms during hemodialysis sessions"

Patients will be monitored with telemetry on both arms of the trial.