[Antiplatelet therapy after open heart surgery].

This study evaluated the effects of an antiplatelet drug for the patients after open heart surgery. Dipyridamole (D), aspirin (A), ticlopidine (T) and sarpogrelate hydrochloride (S) were chosen as an antiplatelet drug. The 6 groups were devided into as G 1 with warfarin (W) and D, as G 2 with W alone, as G 3 with A and D, as G 4 with A alone, as G 5 with A and T, and as G 6 with A and S. The indices of anticoagulation and antiplatelet were as follows: TT, APTT, PT, D. Dimer, fibrinogen, TXB2, 6 kPGF1 alpha, beta TG, vWF and platelet aggregation with Grading Curve methods. The results showed that D.Dimer was beyond the normal range in G 1 and G 2. Thromboxane B 2 was increased markedly in G 1 and G 2 and showed under the normal range in G 3 and G 6. In all groups, 6 kPGF1 alpha showed low levels than normal. Activation of platelet causes the increased beta TG which was not suppressed with the antiplatelet drugs administered. The platelet aggregation was not suppressed in G 1 and G 2. Mild to moderate suppression was seen in G 3 and G 4 with no difference between the two group. Moderate to marked suppression was demonstrated in G 5 and G 6. This study demonstrated that dipyridamole had no effects as antiplatelet function. Aspirin showed antiplatelet effects and the combination of aspirin with the another antiplatelet drugs demonstrated the additional effects.