Until the mid-1990s, hemodialysis providers depended on access recirculation to tell them that their patient was being under dialyzed and his or her vascular access was failing. Yet, traditional methods such as blood urea nitrogen (BUN) sampling often overestimated recirculation so most patients showed some degree of recirculation (false positives).
Access recirculation occurs when a portion of the blood returning from the dialyzer recirculates though the arterial line rather than passing through the venous circuit. Recirculation generally occurs when access flow (AF) is less than dialysis pump flow (Qb). Underdialysis occurs when recirculation is present and recirculation is now considered a late indicator of a failing access.
Transonic ’s Gold Standard Hemodialysis optimizes dialysis adequacy by:
- Identifying a Discrepancy Between Pump Setting & Delivered Blood Flow as a result of:
- Effects of negative pump pressure effects;
- Condition of access;
- Needle size & placement;
- Kinked or occluded tubing;
- Calibration of the dialysis machine;
- Change in type of dialysis tubing,
- Calibration of Flow/dilution Sensors.