Objective To evaluate risk factors for postoperative acute renal failure requiring dialysis (ARF-D) after hear valve surgery. Methods Adult patients (age≤18 years) underwent valve surgery with preoperative serum crea...Objective To evaluate risk factors for postoperative acute renal failure requiring dialysis (ARF-D) after hear valve surgery. Methods Adult patients (age≤18 years) underwent valve surgery with preoperative serum creati nine 【 300 μmol / L were included between January 2005 and December 2008. Fifty patients developed ARF-D展开更多
The mixture of factor analyzers （MFA） can accurately describe high resolution range profile （HRRP） statistical charac- teristics. But how to determine the proper number of the models is a problem. This paper devel...The mixture of factor analyzers （MFA） can accurately describe high resolution range profile （HRRP） statistical charac- teristics. But how to determine the proper number of the models is a problem. This paper develops a variational Bayesian mixture of factor analyzers （VBMFA） model. This procedure can obtain a lower bound on the Bayesian integral using the Jensen＇s inequality. An analytical solution of the Bayesian integral could be obtained by a hypothesis that latent variables in the model are indepen- dent. During computing the parameters of the model, birth-death moves are utilized to determine the optimal number of model au- tomatically. Experimental results for measured data show that the VBMFA method has better recognition performance than FA and MFA method.展开更多
Objective To analyze the risk factors of bacterial infection in patients with liver cirrhosis complicated with gastroesophageal varices after gastroscopy,and to construct a prediction model.Methods Patients with gastr...Objective To analyze the risk factors of bacterial infection in patients with liver cirrhosis complicated with gastroesophageal varices after gastroscopy,and to construct a prediction model.Methods Patients with gastroesophageal varices due to cirrhosis who underwent gastroscopy in the Third Hospital of Hebei Medical University from January 2021 to May 2023 were enrolled.All patients were divided into infection group and noninfection group according to whether bacterial infection occurred after gastroscopy.展开更多
Objective To investigate the risk factors and prognosis of mitral regurgitation(MR)in patients with chronic kidney disease(CKD).Methods Clinical data were collected from CKD patients who were hospitalized at the Depar...Objective To investigate the risk factors and prognosis of mitral regurgitation(MR)in patients with chronic kidney disease(CKD).Methods Clinical data were collected from CKD patients who were hospitalized at the Department of Nephrology,Xuanwu Hospital,Capital Medical University,from January 1,2018,to December 31,2019,and underwent echocardiography.Patients were followed up until November 1,2021,with theendpointtbeingall-causemortality.Logistic regression was used to analyze the risk factors of MR in CKD patientsK.aplan-Meier survival analysis was performed to plot the survival curve,with the Log-rank test comparing the survival rate.Multivariate Cox regression analysis was used to identify the risk factors of death in CKD patients.Results It was a retrospective single-center study.A total of 555 CKD patients were included,with 262 patients developing MR,of whom 212 patients had mild MR(80.9%),44 patients had modreate MR(16.8%),6 patients had severe MR(2.3%).The prevalence of MR among patients with CKD stages 1 to 5 was 21.9%,33.0%,45.9%,51.9%,and 64.6%,and the prevalence of moderate to severe MR was 0,5.6%,7.4%,10.1%,and 15.9%.Multivariate logistic regression analysis revealed that male sex(0R=1.579,95%CI 1.008-2.476,P=0.046),presence of chronic heart disease(OR=2.263,95%CI 1.398-3.662,P=0.001),CKD stage 4-5(with CKD stage 1-3 as reference,OR=1.744,95%CI 1.007-3.019,P=0.047),and decreasing hemoglobin levels(0R=0.985,95%CI 0.975-0.996,P=0.006)were the associated factors for MR in CKD patients.Kaplan-Meier survival analysis indicated higher all-cause mortality(Log-rank,X^(2)=8.094,P=0.004)in the MR groupp compared to the non-MRR group.Multivariate Cox xregressionanalysisshowedthat increasing age(HR=1.072,95%CI 1.042-1.104,P<0.001),elevating blood phosphorus(HR=2.782,95%CI 1.122-6.895,P=0.027),MR(HR=1.962,95%CI 1.002-3.839,P=0.049)and decreasing albumin(HR=0.927,95%CI 0.886-0.970,P=0.001)were independent associated factors for all-cause death in CKD patients.Conclusion The overall prevalence of MR and the prevalence of moderate to severe MR are increasing with the progression of CKD.Male sex,presence of chronic heart disease,CKD stage 4-5 and decreasing hemoglobin levels are risk factors for MR in CKD patients.MR is an independent risk factor for all-cause mortality in CKD patients.展开更多
Objective To analyze the etiology and risk factors of Zang nationality cerebral infarction patients of different ages in Xizang Autonomous Region,so as to provide basis for more targeted diagnosis,treatmentat nd preve...Objective To analyze the etiology and risk factors of Zang nationality cerebral infarction patients of different ages in Xizang Autonomous Region,so as to provide basis for more targeted diagnosis,treatmentat nd prevention of cerebral infarction in this region.Methods The clinical data of 500 Zang nationality cerebral infarction patients hospitalized in Xizang Autonomous Region People's Hospital from January 2019 to December 2023 were retrospectively analyzed.According to age,they were divided into young and middle-aged group(18-59 years old)and elderly group(60-75 years old).Baseline data,laboratory data and imaging results of patients in each group were collected and retrospectively analyzed.Results The proportion of males in the young and middle-aged group(n=267)[188(70.41%)]was higher than that in the elderly group(n=233)[130(55.79%),X^(2)=11.485,P=0.001].The proportion of smokers[131(49.06%)us 74(31.76%),X^(2)=15.401],drinkers[121(45.32%)us 84(36.05%),X^(2)=4.417],high altitude polycythemia(HAPC)[51(19.10%)us 23(9.87%),X^(2)=8.406],hyperuricemia(HUA)[61(28.90%)vs 34(19.32%),X^(2)=4.766],increased hemoglobin[152(56.93%)vs 97(41.63%),X^(2)=6.677],hypertiglyceridemia[47(17.60%)us 18(7.73%),X^(2)=10.734],hypercholesterolemia[12(4.94%)us 3(1.29%),X^(2)=4.397],hyperlipidemia[79(29.59%)us 43(18.45%),X^(2)=8.360]in the young and middle-aged group was higher than that in the elderly group(all P<0.05).The proportion of hypertension[108(40.44%)us 158(67.81%),X^(2)=37.413],atrial fibrillation[5(1.87%)vs 20(8.58%),X^(2)=11.797],hyperhomocysteinemia(HHcy)[159(59.55%)us 168(72.10%),X^(2)=8.664],abnormal creatinine[18(6.74%)us 29(12.45%),X^(2)=4.755],atherosclerosis[113(42.32%)us 145(62.23%),X^(2)=19.748],heart disease[135(50.56%)vs 150(64.38%),X^(2)=9.690]in the young and middle-aged group was lower than that in the elderly group(all P<0.05).Multivariate Logistic regression analysis showed that hypertension(OR=2.865,95%CI 1.742-4.710)and HHcy(OR=1.968,95%CI 1.177-3.290)were risk factors of cerebral infarction in the elderly group.Smoking(OR=1.848,95%CI 1.017-3.360),HAPC(0R=1.993,95%CI 1.991-4.011),HUA(0R=1.863,95%CI 1.015-3.419)and living at the extremely high altitude(OR=2.405,95%CI 1.207-4.791)were risk factors of cerebral infarctionintheyoung and middle-aged group.According to the TOAST etiological classification,the causes of stroke of other determined etiology and stroke of other undetermined etiology were complex and diverse,which were more common in the young and middle-aged group,while cardiac embolism was more common in the elderlygroup.ConclusionThere are significant differences in the risk factors and etiology of cerebral infarction in different age groups in Xizang Autonomous Region.The occurrence of cerebral infarction in elderly patients is significantly related to hypertension and HHcy,while the occurrence of cerebral infarction in young and middle-aged patients is significantly related to smoking,HAPC,HUA,and living in extremely high altitude areas.In clinical practice,diagnosis and treatment of cerebral infarction patients in different age groups should have different focuses.展开更多
Objective To analyze the factors influencing the time-dependent effect and prognosis of recruitment-toinflation ratio (R/I) and elastic power in the prone position in patients with moderate-to-severe acute respiratory...Objective To analyze the factors influencing the time-dependent effect and prognosis of recruitment-toinflation ratio (R/I) and elastic power in the prone position in patients with moderate-to-severe acute respiratory distress syndrome (ARDS).展开更多
Within 30 min after live operation of gas-insulated switchgear(GIS),more than 60%of discharge failures are caused by metallic particles.To address this issue,this study explored the vibration propagation mechanisms in...Within 30 min after live operation of gas-insulated switchgear(GIS),more than 60%of discharge failures are caused by metallic particles.To address this issue,this study explored the vibration propagation mechanisms in GIS cavities and established an equivalent vibration transmission model.A kinetic energy transfer conservation model between the cavity and particles was constructed,systematically analyzing the critical factors affecting the particle starting field strength and explicitly formulating the criterion for vibration-induced particle activation.The electric field distortion caused by particle rotation was investigated,and a collision dynamics model characterizing rotational mo-tion was developed.By analyzing the critical conditions for stable and rotational motion,the corresponding criterion was derived.The results showed that the electric field distortion caused by flaky particles increases with the rotation angle.Vibration effectively activates particles and enhances their mobility.The discharge risk is positively correlated with vibration intensity and particle thickness,but negatively correlated with particle size.This paper clarifies the motion mechanism of flaky metal particles in GIS under shock vibration,providing support for solving the problem of frequent faults after GIS live operation.展开更多
文摘Objective To evaluate risk factors for postoperative acute renal failure requiring dialysis (ARF-D) after hear valve surgery. Methods Adult patients (age≤18 years) underwent valve surgery with preoperative serum creati nine 【 300 μmol / L were included between January 2005 and December 2008. Fifty patients developed ARF-D
基金supported in part by the National Natural Science Foundation of China(60772140)the Program for Cheung Kong Scholarsand Innovative Research Team in University(IRT0645)
文摘The mixture of factor analyzers （MFA） can accurately describe high resolution range profile （HRRP） statistical charac- teristics. But how to determine the proper number of the models is a problem. This paper develops a variational Bayesian mixture of factor analyzers （VBMFA） model. This procedure can obtain a lower bound on the Bayesian integral using the Jensen＇s inequality. An analytical solution of the Bayesian integral could be obtained by a hypothesis that latent variables in the model are indepen- dent. During computing the parameters of the model, birth-death moves are utilized to determine the optimal number of model au- tomatically. Experimental results for measured data show that the VBMFA method has better recognition performance than FA and MFA method.
文摘Objective To analyze the risk factors of bacterial infection in patients with liver cirrhosis complicated with gastroesophageal varices after gastroscopy,and to construct a prediction model.Methods Patients with gastroesophageal varices due to cirrhosis who underwent gastroscopy in the Third Hospital of Hebei Medical University from January 2021 to May 2023 were enrolled.All patients were divided into infection group and noninfection group according to whether bacterial infection occurred after gastroscopy.
文摘Objective To investigate the risk factors and prognosis of mitral regurgitation(MR)in patients with chronic kidney disease(CKD).Methods Clinical data were collected from CKD patients who were hospitalized at the Department of Nephrology,Xuanwu Hospital,Capital Medical University,from January 1,2018,to December 31,2019,and underwent echocardiography.Patients were followed up until November 1,2021,with theendpointtbeingall-causemortality.Logistic regression was used to analyze the risk factors of MR in CKD patientsK.aplan-Meier survival analysis was performed to plot the survival curve,with the Log-rank test comparing the survival rate.Multivariate Cox regression analysis was used to identify the risk factors of death in CKD patients.Results It was a retrospective single-center study.A total of 555 CKD patients were included,with 262 patients developing MR,of whom 212 patients had mild MR(80.9%),44 patients had modreate MR(16.8%),6 patients had severe MR(2.3%).The prevalence of MR among patients with CKD stages 1 to 5 was 21.9%,33.0%,45.9%,51.9%,and 64.6%,and the prevalence of moderate to severe MR was 0,5.6%,7.4%,10.1%,and 15.9%.Multivariate logistic regression analysis revealed that male sex(0R=1.579,95%CI 1.008-2.476,P=0.046),presence of chronic heart disease(OR=2.263,95%CI 1.398-3.662,P=0.001),CKD stage 4-5(with CKD stage 1-3 as reference,OR=1.744,95%CI 1.007-3.019,P=0.047),and decreasing hemoglobin levels(0R=0.985,95%CI 0.975-0.996,P=0.006)were the associated factors for MR in CKD patients.Kaplan-Meier survival analysis indicated higher all-cause mortality(Log-rank,X^(2)=8.094,P=0.004)in the MR groupp compared to the non-MRR group.Multivariate Cox xregressionanalysisshowedthat increasing age(HR=1.072,95%CI 1.042-1.104,P<0.001),elevating blood phosphorus(HR=2.782,95%CI 1.122-6.895,P=0.027),MR(HR=1.962,95%CI 1.002-3.839,P=0.049)and decreasing albumin(HR=0.927,95%CI 0.886-0.970,P=0.001)were independent associated factors for all-cause death in CKD patients.Conclusion The overall prevalence of MR and the prevalence of moderate to severe MR are increasing with the progression of CKD.Male sex,presence of chronic heart disease,CKD stage 4-5 and decreasing hemoglobin levels are risk factors for MR in CKD patients.MR is an independent risk factor for all-cause mortality in CKD patients.
文摘Objective To analyze the etiology and risk factors of Zang nationality cerebral infarction patients of different ages in Xizang Autonomous Region,so as to provide basis for more targeted diagnosis,treatmentat nd prevention of cerebral infarction in this region.Methods The clinical data of 500 Zang nationality cerebral infarction patients hospitalized in Xizang Autonomous Region People's Hospital from January 2019 to December 2023 were retrospectively analyzed.According to age,they were divided into young and middle-aged group(18-59 years old)and elderly group(60-75 years old).Baseline data,laboratory data and imaging results of patients in each group were collected and retrospectively analyzed.Results The proportion of males in the young and middle-aged group(n=267)[188(70.41%)]was higher than that in the elderly group(n=233)[130(55.79%),X^(2)=11.485,P=0.001].The proportion of smokers[131(49.06%)us 74(31.76%),X^(2)=15.401],drinkers[121(45.32%)us 84(36.05%),X^(2)=4.417],high altitude polycythemia(HAPC)[51(19.10%)us 23(9.87%),X^(2)=8.406],hyperuricemia(HUA)[61(28.90%)vs 34(19.32%),X^(2)=4.766],increased hemoglobin[152(56.93%)vs 97(41.63%),X^(2)=6.677],hypertiglyceridemia[47(17.60%)us 18(7.73%),X^(2)=10.734],hypercholesterolemia[12(4.94%)us 3(1.29%),X^(2)=4.397],hyperlipidemia[79(29.59%)us 43(18.45%),X^(2)=8.360]in the young and middle-aged group was higher than that in the elderly group(all P<0.05).The proportion of hypertension[108(40.44%)us 158(67.81%),X^(2)=37.413],atrial fibrillation[5(1.87%)vs 20(8.58%),X^(2)=11.797],hyperhomocysteinemia(HHcy)[159(59.55%)us 168(72.10%),X^(2)=8.664],abnormal creatinine[18(6.74%)us 29(12.45%),X^(2)=4.755],atherosclerosis[113(42.32%)us 145(62.23%),X^(2)=19.748],heart disease[135(50.56%)vs 150(64.38%),X^(2)=9.690]in the young and middle-aged group was lower than that in the elderly group(all P<0.05).Multivariate Logistic regression analysis showed that hypertension(OR=2.865,95%CI 1.742-4.710)and HHcy(OR=1.968,95%CI 1.177-3.290)were risk factors of cerebral infarction in the elderly group.Smoking(OR=1.848,95%CI 1.017-3.360),HAPC(0R=1.993,95%CI 1.991-4.011),HUA(0R=1.863,95%CI 1.015-3.419)and living at the extremely high altitude(OR=2.405,95%CI 1.207-4.791)were risk factors of cerebral infarctionintheyoung and middle-aged group.According to the TOAST etiological classification,the causes of stroke of other determined etiology and stroke of other undetermined etiology were complex and diverse,which were more common in the young and middle-aged group,while cardiac embolism was more common in the elderlygroup.ConclusionThere are significant differences in the risk factors and etiology of cerebral infarction in different age groups in Xizang Autonomous Region.The occurrence of cerebral infarction in elderly patients is significantly related to hypertension and HHcy,while the occurrence of cerebral infarction in young and middle-aged patients is significantly related to smoking,HAPC,HUA,and living in extremely high altitude areas.In clinical practice,diagnosis and treatment of cerebral infarction patients in different age groups should have different focuses.
文摘Objective To analyze the factors influencing the time-dependent effect and prognosis of recruitment-toinflation ratio (R/I) and elastic power in the prone position in patients with moderate-to-severe acute respiratory distress syndrome (ARDS).
基金National Natural Science Foundation of China,Grant/Award Number:52177140Fundamental Research Funds for the Central Universities,Grant/Award Number:2023JC005The State Grid Corporation of China Limited Science and Technology Program,Grant/Award Number:5200-202355792A-3-8-KJ。
文摘Within 30 min after live operation of gas-insulated switchgear(GIS),more than 60%of discharge failures are caused by metallic particles.To address this issue,this study explored the vibration propagation mechanisms in GIS cavities and established an equivalent vibration transmission model.A kinetic energy transfer conservation model between the cavity and particles was constructed,systematically analyzing the critical factors affecting the particle starting field strength and explicitly formulating the criterion for vibration-induced particle activation.The electric field distortion caused by particle rotation was investigated,and a collision dynamics model characterizing rotational mo-tion was developed.By analyzing the critical conditions for stable and rotational motion,the corresponding criterion was derived.The results showed that the electric field distortion caused by flaky particles increases with the rotation angle.Vibration effectively activates particles and enhances their mobility.The discharge risk is positively correlated with vibration intensity and particle thickness,but negatively correlated with particle size.This paper clarifies the motion mechanism of flaky metal particles in GIS under shock vibration,providing support for solving the problem of frequent faults after GIS live operation.
