Measuring perianastomotic pressure to identify patients at high risk for dialysis-associated steal syndrome.

Objective: Dialysis access-associated steal syndrome (DASS) is one of the most serious complications of hemoaccess surgery. Treatment algorithms involve significant morbidity; a tool to reliably identify patients at risk who could benefit from interventions at time of operation would be useful. We present a strategy of using perianastomotic pressure (PAP) measurement to identify patients who may be at high risk of developing DASS.

Methods: Patients who underwent dialysis access creation between January 1, 2018, and September 30, 2022, at our institution were reviewed. Beginning in October 2019, we developed a strategy of measuring systolic pressure at the arterial anastomosis intraoperatively. A ratio of this value compared with the systemic systolic pressure was calculated. In patients believed to be at high risk for developing DASS based on clinical findings, selective banding of the access was performed intraoperatively to augment distal perfusion.

Results: Of 857 total patients, 36 (4.2%) developed clinically significant DASS, defined as requiring operative treatment, either intraoperatively or during follow-up (mean, 76 days; range, 0-602 days). DASS was more common for femoral-based accesses (6/12 [46.2%]) compared with upper extremity accesses (30/840 [3.6%]; P < .001). No patients who underwent radiocephalic arteriovenous fistula or infraclavicular axillary arteriovenous graft construction developed DASS. There was no difference in DASS for upper extremity arteriovenous fistulas (20/576, 3.47%) vs AV grafts (10/264, 3.79%; P = .82). There were 216 patients who had PAP measured intraoperatively. Fourteen (6.5%) of these 216 patients developed DASS requiring intervention in follow-up. The mean PAP ratio of these 14 patients was 0.395 vs 0.557 for the 202 patients who did not (95% confidence interval, 0.07-0.25; P = .001). Seventeen patients who had a low PAP ratio with poor distal perfusion underwent intraoperative banding, which improved the mean PAP ratios from a mean of 0.33 to 0.58. Despite banding, 3 of these 17 patients (17.6%) in this high-risk subgroup went on to develop DASS postoperatively. The calculated mean PAP ratio in patients who either developed DASS postoperatively or underwent prophylactic banding intraoperatively was 0.37, which was significantly lower than the mean ratio of 0.57 in the control group (P = .001).

Conclusions: Low PAP ratios (<0.50) identified patients at increased risk for DASS, but prophylactic banding did not always prevent the occurrence of DASS in select patients. Because steal is a dynamic phenomenon, intraoperative conditions are not always going to reflect later adaptation. Nonetheless, PAP measurement may identify a subgroup of patients warranting procedural modification or closer postoperative physiological monitoring.