Objective To investigate the contributing factors and in-hospital prognosis of patients with or without recurrent acute myocardial infarction （AMI）. Methods A total of 1686 consecutive AMI patients admitted to Pekin...Objective To investigate the contributing factors and in-hospital prognosis of patients with or without recurrent acute myocardial infarction （AMI）. Methods A total of 1686 consecutive AMI patients admitted to Peking University People＇s Hospital from January 2010 to December 2015 were recruited. Their clinical characteristics were retrospectively compared between patients with or without a recurrent AMI. Then multivariable logistic regression was used to estimate the predictors of recurrent myocardial infarction. Results Recurrent AMI patients were older （69.3 ± 11.5 vs. 64.7 ± 12.8 years, P 〈 0.001） and had a higher prevalence of diabetes mellitus （DM） （52.2% vs. 35.0%, P 〈 0.001） compared with incident AMI patients, they also had worse heart function at admission, more severe coronary disease and lower reperfusion therapy. Age （OR = 1.03, 95% CI： 1.02-1.05; P 〈 0.001）, DM （OR = 1.86, 95% CI： 1.37-2.52; P 〈 0.001） and reperfusion therapy （OR = 0.74; 95% CI： 0.52-0.89; P 〈 0.001） were independent risk factors for recurrent AMI Recurrent AMI patients had a higher in-hospital death rate （12.1% vs. 7.8%, P = 0.039） than incident AMI patients. Conclusions Recurrent AMI patients presented with more severe coronary artery conditions. Age, DM and reperfusion therapy were independent risk factors for recurrent AMI, and recurrent AM1 was related with a high risk of in-hospital death.展开更多
Due to the difficulty and weakness of current stress measurement methods in deep soft rock, a new rheological stress recovery method of the determination of the three-dimensional(3D) stress tensor is proposed. It is s...Due to the difficulty and weakness of current stress measurement methods in deep soft rock, a new rheological stress recovery method of the determination of the three-dimensional(3D) stress tensor is proposed. It is supposed that rock stresses will recovery gradually with time and can be measured by embedding transducers into the borehole. In order to explore the applicability and accuracy of this method, analytical solutions are developed for stress measurement with the rheological stress recovery method in a viscoelastic surrounding rock, the rheological properties of which are depicted as both the Burger's model and a 3-parameter solid model. In such conditions, explicit analytical expressions for predicting time-dependent pressures on the transducer are derived. A parametric analysis is then adopted to investigate the influences of the grout solidification time and the mechanical properties of the grout layer. The results indicate that this method is suitable for stress measurement in deep soft rock, the characteristics of which are soft, fractured and subjected to high geo-stress.展开更多
文摘Objective To investigate the contributing factors and in-hospital prognosis of patients with or without recurrent acute myocardial infarction （AMI）. Methods A total of 1686 consecutive AMI patients admitted to Peking University People＇s Hospital from January 2010 to December 2015 were recruited. Their clinical characteristics were retrospectively compared between patients with or without a recurrent AMI. Then multivariable logistic regression was used to estimate the predictors of recurrent myocardial infarction. Results Recurrent AMI patients were older （69.3 ± 11.5 vs. 64.7 ± 12.8 years, P 〈 0.001） and had a higher prevalence of diabetes mellitus （DM） （52.2% vs. 35.0%, P 〈 0.001） compared with incident AMI patients, they also had worse heart function at admission, more severe coronary disease and lower reperfusion therapy. Age （OR = 1.03, 95% CI： 1.02-1.05; P 〈 0.001）, DM （OR = 1.86, 95% CI： 1.37-2.52; P 〈 0.001） and reperfusion therapy （OR = 0.74; 95% CI： 0.52-0.89; P 〈 0.001） were independent risk factors for recurrent AMI Recurrent AMI patients had a higher in-hospital death rate （12.1% vs. 7.8%, P = 0.039） than incident AMI patients. Conclusions Recurrent AMI patients presented with more severe coronary artery conditions. Age, DM and reperfusion therapy were independent risk factors for recurrent AMI, and recurrent AM1 was related with a high risk of in-hospital death.
基金supported by the National Basic Research Program of China (No.2014CB046904)the National Natural Science Foundation of China (Nos.41130742 and 11302242)
文摘Due to the difficulty and weakness of current stress measurement methods in deep soft rock, a new rheological stress recovery method of the determination of the three-dimensional(3D) stress tensor is proposed. It is supposed that rock stresses will recovery gradually with time and can be measured by embedding transducers into the borehole. In order to explore the applicability and accuracy of this method, analytical solutions are developed for stress measurement with the rheological stress recovery method in a viscoelastic surrounding rock, the rheological properties of which are depicted as both the Burger's model and a 3-parameter solid model. In such conditions, explicit analytical expressions for predicting time-dependent pressures on the transducer are derived. A parametric analysis is then adopted to investigate the influences of the grout solidification time and the mechanical properties of the grout layer. The results indicate that this method is suitable for stress measurement in deep soft rock, the characteristics of which are soft, fractured and subjected to high geo-stress.
