Fig. 3

Collection of platelet-rich plasma and timing of blood sampling. Blood sampling was conducted at each of the following time points: a: beginning of surgery (before administration of heparin), b: after discontinuation of cardiopulmonary bypass and protamine administration; and c: after returning the autologous platelet-rich plasma. Platelet count and platelet aggregation ability (MCM Hema Tracer 712, MC medical, Tokyo, Japan) were measured