Background
Centrifugation-based autotransfusion devices only salvage red blood cells while platelets are removed. The same™ device (i-SEP, France) is an innovative filtration-based autotransfusion device able to salvage both red blood cells and platelets. We tested the hypothesis that this new device could allow a red blood cell recovery exceeding 80% with a post-treatment hematocrit exceeding 40%, and would remove more than 90% of heparin and 75% of free hemoglobin.
Methods
Adults undergoing on-pump elective cardiac surgery were included in a non-comparative multicenter trial. The device was used intraoperatively to treat shed and residual cardiopulmonary bypass blood. The primary outcome was a composite of cell recovery performance, assessed in the device by red blood cell recovery and post-treatment hematocrit, and of biological safety assessed in the device by the washout of heparin and free hemoglobin expressed as removal ratios. Secondary outcomes included platelet recovery and function and adverse events (clinical and device-related adverse events) up to 30 days after surgery.
Results
We included 50 patients of whom 18 (35%) underwent isolated CABG, 26 (52%) valve surgery and 6 (12%) aortic root surgery. The median red blood cell recovery per cycle was 86.1 (25th-75th; 80.8-91.6) % with post-treatment hematocrit of 41.8 (39.7-44.2) %. Removal ratios for heparin and free-hemoglobin were 98.9 (98.2–99.7) % and 94.6 (92.7-96.6) % respectively. No adverse device effect was reported. Median platelet recovery was 52.4 (44.2–60.1) %, with a post-treatment concentration of 116 (93-146) 109.L-1. Platelet activation state and function, evaluated by flow cytometry, was found unaltered by the device.
Conclusions
In this first-in-human study, the sameTM device was able to simultaneously recover and wash both platelets and red blood cell. Compared pre-clinical evaluations, the device achieved a higher platelet recovery of 52% with minimal platelet activation while maintaining platelet ability to be activated in vitro.