Background Despite outstanding antiplatelet properties of aspirin and clopidogrel, some patients taking these drugs continue to suffer complications. Antiplatelet resistance appears to be a new prognostic factor in ac...Background Despite outstanding antiplatelet properties of aspirin and clopidogrel, some patients taking these drugs continue to suffer complications. Antiplatelet resistance appears to be a new prognostic factor in acute coronary syndrome patients for clinical events associated with stent thrombosis （ST）. However, there is no optimal method to identify it and assess its correlation to clinical outcomes. This study sought to evaluate the predictive value of antiplatelet resistance assessed by whole blood impedance aggregometry for the risk of early ST in patients with acute coronary syndrome who underwent coronary stenting. Methods Platelet responses to aspirin and clopidogrel in 86 patients with acute coronary syndrome were measured by whole blood impedance aggregometry. Spontaneous platelet aggregation was defined as antiplatelet resistance identified by the increased electrical impedance. The clinical endpoint was early stent thrombosis during 30-day follow-up after coronary stenting. Results The prevalence of aspirin resistance, clopidogrel resistance and dual resistance of combined clopidogrel and aspirin resistance were 19.8%, 12.8% and 5.8% respectively. Diabetes, female and higher platelet counts were more frequently detected in clopidogrel-resistant and dual-resistant patients. During 30-day follow-up, the patients with clopidogrel resistance and dual resistance had higher incidence of early stent thrombosis （18.2% vs. 1.3%, 40.0% vs. 1.2%, P 〈0.05）. Binary Logistic Regression analysis indicated that dual resistance remained an independent predicator for early stent thrombosis （odds ratio 34.064, 95% CI 1.919-604.656, P=-0.016）. Conclusions Antiplatelet resistance assessed by whole blood impedance aggregometry is paralleled to clinical events, and dual antiplatelet resistance is an independent predicator for early stent thrombosis in patients with acute coronary syndrome. As a physiological assessment of platelet reactivity, whole blood impedance aggregometry is a convenient and accurate opt展开更多
目的评价PLT-11血小板聚集仪电阻抗原理检测全血血小板聚集功能这一新方法的性能及临床价值。方法①参照美国临床和实验室标准协会,(Clinical and Laboratory Standards Institute,CLSI)相关文件,测试PL-11血小板聚集分析仪的日间、批...目的评价PLT-11血小板聚集仪电阻抗原理检测全血血小板聚集功能这一新方法的性能及临床价值。方法①参照美国临床和实验室标准协会,(Clinical and Laboratory Standards Institute,CLSI)相关文件,测试PL-11血小板聚集分析仪的日间、批内、批间的不精密度,准确性,携带污染率及线性性能。②选取2012年8月至2013年2月到解放军总医院就诊的患者100例,同时采用PL-11电阻抗法和临床比较公认的光学比浊法(light transmittance aggregometry,LTA)检测血小板聚集功能,对两种方法进行相关性分析;分析添加诱聚剂前两次检测的PLT的重复性,用散点图、相关系数表示。结果①PL-11电阻抗法和LTA法检测血小板聚集率相关性良好,r=0.62,P【0.01;②2个时间点的重复性较好,PLT(r=0.95,P【0.01);③各项检测的结果都符合CLIA’88的要求,其中检测的高值、低值质控品的PLT、RBC、MCV、MPV的日间、批内、批间不精密度的CV【5%,高值、低值的总变异系数(coefficient of varible,CV)分别为PLT(3.00&1.68),RBC(1.63&2.16),MCV(1.30&0.75),MPV(1.40&1.46);RBC、PLT的携带污染率分别为1.16%,1.02%,均【1.5%;PLT在40~800×109/L、RBC在0.3~6.0×1012/L的线性良好,r均】0.995;准确性实验,四大参数偏倚符合文件要求。结论 PL-11血小板聚集仪电阻抗原理检测全血血小板聚集功能的性能良好,是一种准确、可靠的检测血小板聚集功能的新方法。该仪器具有自动化程度高、操作简便、人为影响因素小等优点。展开更多
Highly fluorescent binary and ternary hybrid materials based on polyaniline, polyethylene glycol (PEG) and arsenic sulphide have been prepared via oxidative chemical polymerization and characterized by FT-IR and powde...Highly fluorescent binary and ternary hybrid materials based on polyaniline, polyethylene glycol (PEG) and arsenic sulphide have been prepared via oxidative chemical polymerization and characterized by FT-IR and powder X-ray diffraction techniques. Thermogravimetric analysis showed that all the materials are thermally stable up to 250℃. The optical behaviour was investigated using UV-Vis. and fluorescence spectroscopy. Fluorescence spectra of polyaniline and its hybrids were found to be concentration dependent, and concentrations were optimized to achieve maximum intensity of emission. Aggregation caused quenching (ACQ) may be the possible reason for concentration dependent emission. Hybrids showed significantly enhanced fluorescence than polyaniline. The AC electrical conductivity was also measured and found to be better for hybrids than the polyaniline. In the PAni-PEG-As2S3 hybrid, the conductivity was found to be 9.57 × 10<sup>-1</sup> S/cm at 100 KHz. This valuable improvement in luminescent property and conducting behaviour may be useful in various optoelectronic and electronic applications.展开更多
文摘Background Despite outstanding antiplatelet properties of aspirin and clopidogrel, some patients taking these drugs continue to suffer complications. Antiplatelet resistance appears to be a new prognostic factor in acute coronary syndrome patients for clinical events associated with stent thrombosis （ST）. However, there is no optimal method to identify it and assess its correlation to clinical outcomes. This study sought to evaluate the predictive value of antiplatelet resistance assessed by whole blood impedance aggregometry for the risk of early ST in patients with acute coronary syndrome who underwent coronary stenting. Methods Platelet responses to aspirin and clopidogrel in 86 patients with acute coronary syndrome were measured by whole blood impedance aggregometry. Spontaneous platelet aggregation was defined as antiplatelet resistance identified by the increased electrical impedance. The clinical endpoint was early stent thrombosis during 30-day follow-up after coronary stenting. Results The prevalence of aspirin resistance, clopidogrel resistance and dual resistance of combined clopidogrel and aspirin resistance were 19.8%, 12.8% and 5.8% respectively. Diabetes, female and higher platelet counts were more frequently detected in clopidogrel-resistant and dual-resistant patients. During 30-day follow-up, the patients with clopidogrel resistance and dual resistance had higher incidence of early stent thrombosis （18.2% vs. 1.3%, 40.0% vs. 1.2%, P 〈0.05）. Binary Logistic Regression analysis indicated that dual resistance remained an independent predicator for early stent thrombosis （odds ratio 34.064, 95% CI 1.919-604.656, P=-0.016）. Conclusions Antiplatelet resistance assessed by whole blood impedance aggregometry is paralleled to clinical events, and dual antiplatelet resistance is an independent predicator for early stent thrombosis in patients with acute coronary syndrome. As a physiological assessment of platelet reactivity, whole blood impedance aggregometry is a convenient and accurate opt
文摘目的评价PLT-11血小板聚集仪电阻抗原理检测全血血小板聚集功能这一新方法的性能及临床价值。方法①参照美国临床和实验室标准协会,(Clinical and Laboratory Standards Institute,CLSI)相关文件,测试PL-11血小板聚集分析仪的日间、批内、批间的不精密度,准确性,携带污染率及线性性能。②选取2012年8月至2013年2月到解放军总医院就诊的患者100例,同时采用PL-11电阻抗法和临床比较公认的光学比浊法(light transmittance aggregometry,LTA)检测血小板聚集功能,对两种方法进行相关性分析;分析添加诱聚剂前两次检测的PLT的重复性,用散点图、相关系数表示。结果①PL-11电阻抗法和LTA法检测血小板聚集率相关性良好,r=0.62,P【0.01;②2个时间点的重复性较好,PLT(r=0.95,P【0.01);③各项检测的结果都符合CLIA’88的要求,其中检测的高值、低值质控品的PLT、RBC、MCV、MPV的日间、批内、批间不精密度的CV【5%,高值、低值的总变异系数(coefficient of varible,CV)分别为PLT(3.00&1.68),RBC(1.63&2.16),MCV(1.30&0.75),MPV(1.40&1.46);RBC、PLT的携带污染率分别为1.16%,1.02%,均【1.5%;PLT在40~800×109/L、RBC在0.3~6.0×1012/L的线性良好,r均】0.995;准确性实验,四大参数偏倚符合文件要求。结论 PL-11血小板聚集仪电阻抗原理检测全血血小板聚集功能的性能良好,是一种准确、可靠的检测血小板聚集功能的新方法。该仪器具有自动化程度高、操作简便、人为影响因素小等优点。
文摘Highly fluorescent binary and ternary hybrid materials based on polyaniline, polyethylene glycol (PEG) and arsenic sulphide have been prepared via oxidative chemical polymerization and characterized by FT-IR and powder X-ray diffraction techniques. Thermogravimetric analysis showed that all the materials are thermally stable up to 250℃. The optical behaviour was investigated using UV-Vis. and fluorescence spectroscopy. Fluorescence spectra of polyaniline and its hybrids were found to be concentration dependent, and concentrations were optimized to achieve maximum intensity of emission. Aggregation caused quenching (ACQ) may be the possible reason for concentration dependent emission. Hybrids showed significantly enhanced fluorescence than polyaniline. The AC electrical conductivity was also measured and found to be better for hybrids than the polyaniline. In the PAni-PEG-As2S3 hybrid, the conductivity was found to be 9.57 × 10<sup>-1</sup> S/cm at 100 KHz. This valuable improvement in luminescent property and conducting behaviour may be useful in various optoelectronic and electronic applications.
