The prostacyclin synthesis stimulating plasma factor is unchanged during acute angina pectoris.

Earlier studies have demonstrated that the levels of prostacyclin synthesis stimulating plasma factor are changed during various clinical situations thus leading to disturbances in hemostatic balance. Therefore, we studied the plasma factor in 20 patients undergoing acute anginal attacks in order to see whether there is any influence or a timedependent change after the event. The patients were subdivided into males or females as well as into those with or without maturity onset diabetes and who were smokers or no-smokers. As in-vitro test systems the rat abdominal aorta, human coronary artery and cultured endothelial and smooth muscle cells obtained from minipigs were used. Our findings demonstrate that incubating the different tissue samples in plasma leads to a significant increase of prostacyclin formation or of its stable breakdown 6-oxo-PGF1 respectively, in comparison to buffer control incubation. However, in none of the groups was a change observed during an anginal attack or in rate 60 and 120 minutes thereafter. These findings suggest that the prostacyclin synthesis stimulating plasma factor is not involved in hemostatic dysregulation, which has been observed to occur during and immediately after a coronary anginal attack.