Abstract
We investigated thromboxane B2 (TxB2), 6-keto-PGF1 alpha (6KPGF1 alpha reflecting prostacyclin), PGE2 and PGF2 alpha plasma levels; TxB2, PGE2 and PGF2 alpha platelet production and platelet aggregation response in ascending aorta (reflecting trans-pulmonary difference) and in venous coronary sinus (reflecting transcardiac difference) simultaneously in patients with ischemic heart disease, before and after right-atrial administration of 3 mg ISDN bolus. Transcardiac differences were scarce before as well as after ISDN administration. In aortic blood, ISDN administration into the right atria resulted in a significant increase in prostacyclin and PGF2 alpha plasma levels (472% and 242%, respectively), a decrease of both PGE2 plasma level (-173%) and PGE2 platelet production (-485%) and a marked lowering of platelet aggregation response to ADP, concomittantly. In contrast, TxB2-related features were poorly affected by ISDN. In coronary sinus blood, the aortic increase in 6KPGF1 alpha and PGF2 alpha plasma levels was detected to a lower extent whereas the characteristics of platelet aggregation had returned to control levels. By contrast, PGE2 plasma level (-191%) and PGE2 platelet production (-133%) were lower than prior ISDN admi...Continue Reading
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