Based on the long period surface wave data recorded by the China Digital Seismograph Network (CDSN), the Q R of fundamental mode Rayleigh wave with periods from 10 s to 146 s is determined for the eastern Sino ...Based on the long period surface wave data recorded by the China Digital Seismograph Network (CDSN), the Q R of fundamental mode Rayleigh wave with periods from 10 s to 146 s is determined for the eastern Sino Korean paraplatform in this paper. The Q β models of the crust and upper mantle are respectively obtained for the 4 paths, with the aid of stochastic inverse method. It shows that in the eastern Sino Korean paraplatform, the average crustal Q β is about 200, and that there exists a weak attenuation layer in the middle crust (about 10～20 km deep) which is possibly related to earthquake prone layer. A strong attenuation layer (low Q ) of 70 km thick extensively exists in the uppermost mantle, with the buried depth about 80 km. The average Q R of fundamental mode Rayleigh wave is between the value of stable tectonic region and that of active tectonic region, and much close to the latter.展开更多
Background The factors influencing the q-wave changes in V5 and V6 during anterior acute myocardial in- farction （AMI） have not been thoroughly described. Methods We studied 70 patients with a first anterior AMI, in...Background The factors influencing the q-wave changes in V5 and V6 during anterior acute myocardial in- farction （AMI） have not been thoroughly described. Methods We studied 70 patients with a first anterior AMI, in whom the electrocardiogram （ECG） showed either disappearance of the normal septal q wave （n = 24） or presence of pathological Q wave in V5 and V6 （n = 46） during follow-up. The ECG and coronary angiography findings were correlated. Results There was no difference between the 2 groups in the culprit site proximal to S1 （46% vs. 36%, P = 0.405）, but the culprit site was more frequently located proximal to DI in the group with abnormal Q wave （21% vs. 67%, P = 0.001）. Patients with disappearance of the septal q wave more often had a large obtuse marginal branch （46 % vs. 22%, P = 0.037） and disappearance of the r wave in V1 （88% vs. 7%, P = 0.001）. Patients with abnormal Q-wave more often had a large LAD （42% vs. 71%）, small r wave or tall or wide R wave in V1 （0 % vs. 89 %, P = 0.001） and abnormal Q waves in the inferior leads （33% vs. 59%, P = 0.044）. Conclusions In patients with first anterior AMI, q wave changes in V5 and V6 correlated with the morphology in V1. Emerging abnormal Q wave in Vs/V6 predicted the culprit lesion in a large LAD proximal to D1, but disappearance of the septal q wave could not predict the culprit lesion proximal to S1.展开更多
Background： End-stage hypertrophic cardiomyopathy （HCM） is complicated by substantial adverse events. However, few studies have focused on electrocardiographic features and their prognostic values in HCM. This stud...Background： End-stage hypertrophic cardiomyopathy （HCM） is complicated by substantial adverse events. However, few studies have focused on electrocardiographic features and their prognostic values in HCM. This study aimed to evaluate the clinical manifestations and prognostic value of electrocardiography in patients with end-stage HCM. Methods： End-stage HCM patients were enrolled from a total of 1844 consecutive HCM patients from April 2002 to November 2013 at Fuwai Hospital. Clinical data, including medical history, electrocardiography, and echocardiography, were analyzed. Cox hazards regression analysis was used to assess the risk factors for cardiovascular mortality. Results： End-stage HCM was identified in 99 （5.4%） patients, averaged at 52 ± 16 years old at entry. Atrial fibrillation was observed in 53 patients and mural thrombus in 19 patients. During 3.9 ±3.0 years of follow-up, embolic stroke, refractory heart failure, and death or transplantation were observed in 20, 39, and 51 patients, respectively. The incidence of annual mortality was 13.2%. Multivariate Cox hazards regression analysis identified New York Heart Association Class （NYHA） Ill/IV at entry （hazard ratio [HR]： 1.99; 95% confidence interval [C/I： 1.05-3.80; P = 0.036）, left bundle branch block （LBBB） （HR： 2.80; 95% CI： 1.47-5.31; P = 0.002）, and an abnormal Q wave （HR： 2.21; 95% CI： 1.16-4.23; P = 0.016） as independent predictors of cardiovascular death, in accordance with all-cause death and heart failure-related death. Conclusions： LBBB and an abnormal Q wave are risk factors of cardiovascular mortality in end-stage HCM and provide new evidence for early intervention. Susceptibility of end-stage HCM patients to mural thrombus and embolic events warrants further attention.展开更多
文摘Based on the long period surface wave data recorded by the China Digital Seismograph Network (CDSN), the Q R of fundamental mode Rayleigh wave with periods from 10 s to 146 s is determined for the eastern Sino Korean paraplatform in this paper. The Q β models of the crust and upper mantle are respectively obtained for the 4 paths, with the aid of stochastic inverse method. It shows that in the eastern Sino Korean paraplatform, the average crustal Q β is about 200, and that there exists a weak attenuation layer in the middle crust (about 10～20 km deep) which is possibly related to earthquake prone layer. A strong attenuation layer (low Q ) of 70 km thick extensively exists in the uppermost mantle, with the buried depth about 80 km. The average Q R of fundamental mode Rayleigh wave is between the value of stable tectonic region and that of active tectonic region, and much close to the latter.
基金supported by Hubei Provincial Department of Education (No. Q20102102)
文摘Background The factors influencing the q-wave changes in V5 and V6 during anterior acute myocardial in- farction （AMI） have not been thoroughly described. Methods We studied 70 patients with a first anterior AMI, in whom the electrocardiogram （ECG） showed either disappearance of the normal septal q wave （n = 24） or presence of pathological Q wave in V5 and V6 （n = 46） during follow-up. The ECG and coronary angiography findings were correlated. Results There was no difference between the 2 groups in the culprit site proximal to S1 （46% vs. 36%, P = 0.405）, but the culprit site was more frequently located proximal to DI in the group with abnormal Q wave （21% vs. 67%, P = 0.001）. Patients with disappearance of the septal q wave more often had a large obtuse marginal branch （46 % vs. 22%, P = 0.037） and disappearance of the r wave in V1 （88% vs. 7%, P = 0.001）. Patients with abnormal Q-wave more often had a large LAD （42% vs. 71%）, small r wave or tall or wide R wave in V1 （0 % vs. 89 %, P = 0.001） and abnormal Q waves in the inferior leads （33% vs. 59%, P = 0.044）. Conclusions In patients with first anterior AMI, q wave changes in V5 and V6 correlated with the morphology in V1. Emerging abnormal Q wave in Vs/V6 predicted the culprit lesion in a large LAD proximal to D1, but disappearance of the septal q wave could not predict the culprit lesion proximal to S1.
文摘Background： End-stage hypertrophic cardiomyopathy （HCM） is complicated by substantial adverse events. However, few studies have focused on electrocardiographic features and their prognostic values in HCM. This study aimed to evaluate the clinical manifestations and prognostic value of electrocardiography in patients with end-stage HCM. Methods： End-stage HCM patients were enrolled from a total of 1844 consecutive HCM patients from April 2002 to November 2013 at Fuwai Hospital. Clinical data, including medical history, electrocardiography, and echocardiography, were analyzed. Cox hazards regression analysis was used to assess the risk factors for cardiovascular mortality. Results： End-stage HCM was identified in 99 （5.4%） patients, averaged at 52 ± 16 years old at entry. Atrial fibrillation was observed in 53 patients and mural thrombus in 19 patients. During 3.9 ±3.0 years of follow-up, embolic stroke, refractory heart failure, and death or transplantation were observed in 20, 39, and 51 patients, respectively. The incidence of annual mortality was 13.2%. Multivariate Cox hazards regression analysis identified New York Heart Association Class （NYHA） Ill/IV at entry （hazard ratio [HR]： 1.99; 95% confidence interval [C/I： 1.05-3.80; P = 0.036）, left bundle branch block （LBBB） （HR： 2.80; 95% CI： 1.47-5.31; P = 0.002）, and an abnormal Q wave （HR： 2.21; 95% CI： 1.16-4.23; P = 0.016） as independent predictors of cardiovascular death, in accordance with all-cause death and heart failure-related death. Conclusions： LBBB and an abnormal Q wave are risk factors of cardiovascular mortality in end-stage HCM and provide new evidence for early intervention. Susceptibility of end-stage HCM patients to mural thrombus and embolic events warrants further attention.
