Abstract
OBJECTIVES: The aim of this study is to evaluate the possibility of the autologous platelet-rich plasma (PRP) collection from the cardiopulmonary bypass (CPB) circuit and to evaluate its effect on the aggregative function. METHODS: For seventy-two patients undergoing cardiac surgery with CPB, an autologous PRP was prepared using the Haemonetics Component Collection System® by drawing blood from the CPB circuit immediately after CPB was established. The blood samples were taken at three points for examination, A: beginning of surgery, B: immediately after heparin reversal with protamine following discontinuation of CPB, C: after the collected autologous PRP was returned to the patient. Platelet count and platelet aggregation ability were analyzed. RESULTS: The mean platelet count in autologous PRP was 5.5 (range: 3-14) units. Platelet count decreased by 115.0 (±27.3) × 1000/μl from A to B and increased by 27.3 ± 17.2 (× 1000/μl) from B to C. When platelet aggregation was measured by Adenosine Diphosphate (ADP) 3.0 μM, it decreased by 42.6% ± 12.1% from A to B and increased by 8.7% ± 7.4% from B to C. CONCLUSIONS: Autologous PRP can be safely collected by drawing blood from the CPB circuit, platelet count and aggregation ability significantly decreased after CPB including autologous PRP collection. Some improvement was detected in the number of the platelets count and platelet aggregation ability by administrating an autologous PRP even if autologous PRP is collected from CPB circuit. TRIAL REGISTRATION: UMI-CTR, UMIN000023776 . Registered 1 October 2016.