Efficacy of Goal-Directed Fluid Therapy Monitored by Pulse-Pressure Variation Using a C ontinuous Non-Invasive Arterial Pressure Monitoring System (the CNAPTM System) During Parathyroidectomy in Patients with End-Stage Renal Failure - A randomized trial

Background: There are no well-recognized guidelines for intraoperative fluid management in patients with end-stage renal failure (ESRF) . Goal-directed fluid therapy (GDFT) is a concept of perioperative fluid management that improves patients’ prognosis. Dynamic indicators better predict fluid response than static indicators. Aim: In this study, we assessed a GDFT protocol with monitoring of pulse pressure variation (PPV) in patients with ESRF undergoing parathyroidectomy. Methods: The study included 102 patients who underwent elective parathyroidectomy. They were randomized to a control group (restrictive group, n = 51) that was managed with a restricted fluid regimen or a PPV group (GDFT group, n = 51) that was given a normal saline infusion and was monitored for change in PPV during the intraoperative period. If PPV reached >13%, 250 mL normal saline was administered over 15 min. Ephedrine was given at increments of 6 mg to keep mean arterial pressure >65 mmHg . Hemodynamic variables in the perioperative period were recorded. The primary endpoint was the occurrence of postoperative hypotension. Results: The occurrence of postoperative hypotension in the GDFT group was lower than in the restrictive group (0 vs. 11.67%, P = 0.027). The patients with complications in the GDFT group was lower than in the restrictive group (35.3% vs. 54.9%, P = 0.047). The volume of saline infused during the intraoperative period was 364 (219-408) mL in the GDFT group and 50 (50-50) mL in the restrictive group ( P = 0.001). Ephedrine was given to 16/51 (29.4%) of the GDFT group and 27/51 (52.9%) of the restrictive group ( P = 0.027). Conclusion: The use of goal-directed fluid therapy with the dynamic PPV indicator in patients with ESRF undergoing parathyroidectomy guides the administration of infused fluids, with reduced incidence of postoperative hypotension.