Abstract
目的研究原发免疫性血小板减少症(ITP)患者血小板活化状态和出血程度的相关性。方法采用ITP特异性出血评价工具(ITP-BAT)对43例ITP患者进行出血评分及出血程度分级,应用流式细胞术检测二磷酸腺苷(ADP)激活前后血小板膜糖蛋白(GP)Ⅰb、Ⅱb/Ⅲa和P选择素表达。分析GPⅠb、GPⅡb/Ⅲa、P选择素表达与血小板计数、未成熟血小板比例的相关性;分析GPⅠb、GPⅡb/Ⅲa、P选择素表达与ITP患者出血程度的相关性,以及对中度以上出血患者风险评估的应用价值。结果ITP患者激活前血小板GPⅡb/Ⅲa、P选择素表达均高于正常对照组(65.69±10.73对7.16±0.99,t=4.130,P<0.001;15.43±1.41对12.55±1.03,t=2.070,P=0.043),GPⅠb表达低于正常对照组(240.11±24.93对295.11±22.15,t=2.417,P=0.020)。ITP患者ADP激活后血小板GPⅡb/Ⅲa表达高于正常对照组(133.96±12.17对39.67±4.99,t=5.256,P<0.001),而P选择素、GPⅠb表达低于正常对照组(37.09±3.94对109.77±23.66,t=3.901,P<0.001;149.06±19.14对205.73±21.00,t=2.070,P=0.043)。ADP激活后GPⅠb表达、ADP激活前后P选择素表达及ADP激活前后GPⅠb、P选择素表达比值与血小板计数相关(P<0.05)。ADP激活后P选择素表达、ADP激活前后P选择素表达比值与未成熟血小板比例相关(P<0.05)。ITP患者ADP激活后GPⅠb表达、ADP激活前后P选择素表达及ADP激活前后P选择素、GPⅡb/Ⅲa、GPⅠb表达比值在不同出血程度之间差异有统计学意义(P<0.05)。ADP激活前后GPⅠb表达比值是ITP患者中度以上出血的正性影响因素(OR=3.05,P=0.011),ADP激活前后P选择素、GPⅡb/Ⅲa表达比值是ITP患者中度以上出血的负性影响因素(OR=0.32,P=0.023;OR=0.04,P=0.006)。结论血小板活化指标能较准确地评估ITP患者出血程度,可以作为治疗参考指标和疗效观察指标。
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