Tidal Versus Intermittent Peritoneal Dialysis in Chronic Peritoneal Dialysis Patients: Randomized, Open-Label, Prospective Control Study.

Background: Tidal peritoneal dialysis (TPD) provides better fluid flow mechanics and is more comfortable for the patient, owing to fewer alarms and less pain during inflow and outflow. The long-term characteristics of patients with TPD were not evident. In this randomized controlled follow-up study, we aimed to explore the characteristics of patients with TPD, compared to IPD.

Methods: A total of 85 patients were randomized to either IPD or 70% TPD between January 2019 and December 2020, and all patients were followed up on December 2021. The characteristics of patients between the two groups were analyzed using a t-test or chi-square as appropriate. The overall survival and technical survival were analyzed using Kaplan-Meier analysis.

Results: Forty-two patients were assigned to IPD, and 43 patients were assigned to TPD. The basal characteristics of patients were not different between the two groups. In an average of 16 months of follow-up, 19 patients died, and 25 patients dropped out of peritoneal dialysis. The two groups had no difference in overall survival and technical survival. TPD was associated with high urine volume (p = 0.001), lower blood urea nitrogen (p = 0.002), lower phosphorus (p = 0.004), and fewer cycler alarms (p < 0.001). The chance of patients reporting abdominal fullness was higher in patients with TPD (p = 0.001).

Conclusion: In the randomized, controlled, follow-up study, TPD may preserve residual renal function and is associated with lower urea nitrogen and phosphorus in chronic peritoneal dialysis patients. TPD is associated with fewer cycler alarms but may increase the chance of patients reporting abdominal distension.