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本文测定１４例不稳定型心绞痛（ＵＡ）、１２例稳定劳力型心绞痛（ＳＡ）和１２例健康人的血小板功能和纤溶活性。结果表明，无心绞痛发作时，ＵＡ组，ＳＡ组的血小板聚集率（ＰＡｇ）、血栓素Ｂ２（ＴＸＢ２）和纤溶酶原激活剂的抑制剂（ＰＡＩ）活性均比健康对照组明显增加，但ＵＡ组与ＳＡ组间无明显差异；ＵＡ组和ＳＡ组的血浆组织型纤溶酶原激活剂（ｔ－ＰＡ）活性均明显低于健康对照组，且ＵＡ组比ＳＡ组降低更明显，ＵＡ组在心绞痛发作时，上述指标的变化无显著性差异。本文提示，不稳定型心绞痛患者血栓形成的主要因素可能为ｔ－ＰＡ的活性降低。
This article measured platelet function and fibrinolytic activity in 14 patients with unstable angina (UA), 12 patients with stable angina pectoris (SA) and 12 healthy individuals. The results showed that the activities of platelet aggregation (PAg), thromboxane B2 (TXB2) and plasminogen activator inhibitor (PAI) in UA group and SA group were significantly higher than those in healthy control group UA group and SA group no significant difference; UA group and SA group plasma tissue-type plasminogen activator (t-PA) activity were significantly lower than the healthy control group, and the UA group was significantly lower than the SA group, UA Group angina attacks, the above indicators did not change significantly. This article suggests that the main factor in thrombosis in patients with unstable angina may be reduced t-PA activity.