[Ticlopidine and aspirin in the treatment of unstable angina: comparative evaluation of their effect of anti-aggregation and platelet membranes]. / Tiklopidin i aspirin pri nestabilnoi stenokardii: sravnenie dezagregiruiushchikh svoistv i vozdeistviia na membrany trombotsitov.

The study was undertaken to examine changes in ADP-induced aggregation of platelets, blood-circulating platelet aggregates, platelet phospholipids and cholesterol in patients with unstable angina depending on the therapy with disaggregatory agents. The patients from Group 1 (n = 23) received ticlopidine, 500 mg/day, in addition to antianginal therapy and heparin; those from Group 2 (n = 21) had aspirin, 320 mg/day, those from Group 3 (n = 36) took no disaggregahts. Ticlopidine was found to produce more marked effects on ADT-induced plasma platelet aggregation, in vivo reversible platelet aggregation, and reduced platelet levels of free cholesterol, as compared to aspirin.

[Significance of platelet membrane destruction in vasospastic angina pectoris during its exacerbation]. / Znachenie membrannykh narushenii v trombotsitakh pri vazospasticheskoi stenokardii v period obostreniia zabolevaniia.

The parameters of the structure and function of platelet membranes were examined in 30 patients with unstable vasospastic angina in relation to the outcome of the disease (myocardial infarction stabilization or development). The fractions of phospholipids (lysophosphatidylcholine, phosphatidylserine, sphingomyelin, phosphatidylcholine, phosphatidylethanolamine), the levels of platelet membranous free and esterified cholesterol, plasma malonic dealdehyde and thromboxane B2, the activity of platelet superoxide dismutase and catalase were determined. The exacerbation of vasospastic angina was found to appear as accumulation of cholesterol (mainly of its fraction), an increase in platelet membranous levels of phosphatidylcholine, phosphatidylethanolamine and sphingomyelin, accumulation of malonic dealdehyde. These changes were more profound in cases with subsequent myocardial infarctions. There were differences in the dynamics of the examined parameters in relation to the outcome of the disease.