Background Acute myocardial infarction （AMI） is a common cardiac emergency with high mortality.Serum soluble ST2 （sST2） is a new emerging biomarker of cardiac diseases.The present study is to investigate the predi...Background Acute myocardial infarction （AMI） is a common cardiac emergency with high mortality.Serum soluble ST2 （sST2） is a new emerging biomarker of cardiac diseases.The present study is to investigate the predictive value of sST2 and interleukin-33 （IL-33） for risk stratification and prognosis in patients with AMI.Methods Fifty-nine patients with AMI,whose chief complaint was chest pain or dyspnea,were selected for our study.Physical examination,chest radiograph,electrocardiograph （ECG）,biomarkers of myocardial infarction,NT-proBNP,echocardiography and other relevant examinations were performed to confirm the diagnosis of AMI.Thirty-six healthy people were chosen as the control group.Serum samples from these subjects （patients within 24 hours after acute attack） were collected and the levels of sST2 and IL-33 were assayed by enzyme-linked immuno-sorbent assay （ELISA） kit.The follow-up was performed on the 7th day,28th day,3rd month and 6th month after acute attack.According to the follow-up results we defined the end of observation as recurrence of AMI or any causes of death.Results Median sST2 level of the control group was 9.38ng/ml and that of AMI patients was 29.06ng/ml.Compared with the control group,sST2 expression in the AMI group was significantly different （P〈0.001）.In contrast,the IL-33 level showed no significant difference between the two groups.Serum sST2 was a predictive factor independent of other variables and may provide complementary information to NT-proBNP or GRACE risk score.IL-33 had no relationship to recurrence of AMI.Both sST2 and the IL-33/sST2 ratio were correlated with the 6-month prognosis; areas under the ROC curve were 0.938 and 0.920 respectively.Conclusions Early in the course （〈24 hours） of AMI,sST2 usually increases markedly.The increase of sST2 has an independent predictive value for the prognosis in AMI patients and provides complementary information to NT-proBNP or GRACE risk score.The IL-33/sST2 ratio correlates with the 6-month prognosis of AMI patients.However,there is no significant relationship between IL-33 and the prognosis of AMI patients.展开更多
为了减少北方供暖能耗、提高热电厂余热利用效率,构建了亚临界热电联产机组耦合吸收式热泵系统,并实测其性能,详细对比分析亚临界机组在耦合和切除热泵两种运行工况下的经济性。试验表明:热泵机组性能系数(Coefficient of Performance,C...为了减少北方供暖能耗、提高热电厂余热利用效率,构建了亚临界热电联产机组耦合吸收式热泵系统,并实测其性能,详细对比分析亚临界机组在耦合和切除热泵两种运行工况下的经济性。试验表明:热泵机组性能系数(Coefficient of Performance,COP)为1.74,且热泵机组的制热量和回收热量随着循环水温度和驱动蒸汽压力的增大而增加;对于2台330 MW汽轮机组,热泵机组的投入可以增加供热面积166.03万m^(2);每年节约循环水量47.75万t,煤炭4.03万t,经济效益良好;CO_(2)、SO_(2)和NO_(x)排放量分别减少10.47万t、966 t和281.75 t,节能减排效果显著。展开更多
文摘Background Acute myocardial infarction （AMI） is a common cardiac emergency with high mortality.Serum soluble ST2 （sST2） is a new emerging biomarker of cardiac diseases.The present study is to investigate the predictive value of sST2 and interleukin-33 （IL-33） for risk stratification and prognosis in patients with AMI.Methods Fifty-nine patients with AMI,whose chief complaint was chest pain or dyspnea,were selected for our study.Physical examination,chest radiograph,electrocardiograph （ECG）,biomarkers of myocardial infarction,NT-proBNP,echocardiography and other relevant examinations were performed to confirm the diagnosis of AMI.Thirty-six healthy people were chosen as the control group.Serum samples from these subjects （patients within 24 hours after acute attack） were collected and the levels of sST2 and IL-33 were assayed by enzyme-linked immuno-sorbent assay （ELISA） kit.The follow-up was performed on the 7th day,28th day,3rd month and 6th month after acute attack.According to the follow-up results we defined the end of observation as recurrence of AMI or any causes of death.Results Median sST2 level of the control group was 9.38ng/ml and that of AMI patients was 29.06ng/ml.Compared with the control group,sST2 expression in the AMI group was significantly different （P〈0.001）.In contrast,the IL-33 level showed no significant difference between the two groups.Serum sST2 was a predictive factor independent of other variables and may provide complementary information to NT-proBNP or GRACE risk score.IL-33 had no relationship to recurrence of AMI.Both sST2 and the IL-33/sST2 ratio were correlated with the 6-month prognosis; areas under the ROC curve were 0.938 and 0.920 respectively.Conclusions Early in the course （〈24 hours） of AMI,sST2 usually increases markedly.The increase of sST2 has an independent predictive value for the prognosis in AMI patients and provides complementary information to NT-proBNP or GRACE risk score.The IL-33/sST2 ratio correlates with the 6-month prognosis of AMI patients.However,there is no significant relationship between IL-33 and the prognosis of AMI patients.
