Comparative study between the halfway technique and the standard technique for exchange of tunneled hemodialysis catheter

Objectives: When indicated, tunneled hemodialysis catheters are usually inserted using the standard technique but, this technique has its complications. The halfway method is performed by exchange of an already-inserted dialysis catheter (tunneled or non-tunneled) to a tunneled one over a guidewire mounted via the old catheter. In this study, we aimed at evaluating the feasibility, safety, and durability of halfway method in comparison to the standard technique (de novo puncture). Patients and methods: This prospective study was conducted during the period from May 2020 till May 2022 and included 87 patients with end-stage renal disease (ESRD) on regular hemodialysis (HD) in need for insertion new tunneled dialysis catheters instead of temporary or malfunctioning tunneled ones. According to the technique of catheter insertion, these patients were divided into two groups: group A (the halfway technique: catheters were exchanged over guidewires under fluoroscopic control; 48 patients) and group B (the standard technique: via de novo ultrasound-guided vein puncture; 39 patients). Instant, delayed complications and 12-months patency rates were reported and analyzed. Results: The frequency of peri-operative bleeding complications was better in the halfway group with comparable infection rate and late catheter dysfunction results between the two groups. One year patency rates were 87.5% in halfway technique group compared to 79.5% in standard technique group, yet without statistical significance. However, there was a statistically significant shorter operative time in halfway group (15.54 ± 2.6 min vs 26.97 ± 5.6 min, p < 0.001). Conclusion: The halfway technique may be recommended over the standard technique of tunneled catheter insertion due to shorter operative time, lower rate of hematoma formation, with non-inferior 1-year patency rates and comparable technical success and infection rates. The advantage of access sites preservation for future demand makes this technique of great value to this group of ESRD patients.