By means of reasonable assumption and mathematical derivation, a theoretic expression of flow rate for a single fracture with linearly varying width was obtained. The mathematical derivation was based on the cubic law...By means of reasonable assumption and mathematical derivation, a theoretic expression of flow rate for a single fracture with linearly varying width was obtained. The mathematical derivation was based on the cubic law and the new theoretic expression was an extention of traditional parallel plate model. This study may help to analyze seepage in fractured rock mass.展开更多
A precise model has been developed for studying the inBuence of metallic nanoparticles on blood Row through catheterized tapered elastic arteries with radially varying magnetic field.The model is solved under the mild...A precise model has been developed for studying the inBuence of metallic nanoparticles on blood Row through catheterized tapered elastic arteries with radially varying magnetic field.The model is solved under the mild stenosis approximation by considering blood as viscous fluid.The influence of different Bow parameters associated with this problem such as Hartmann number,nanoparticle volume fraction,Grashof number and heat source or sink parameter is analyzed by plotting the graphs of the wall shear stress,resistance impedance to blood flow and stream lines.The inEuence of the radially varying magnetic field on resistance impedance to Bow is analyzed and it is observed that the signiBcantly strong magnetic force tends to increase in resistance.展开更多
AIM: To determine the impact of red blood cell distribution width on outcome in anemic patients undergoing transcatheter aortic valve implantation(TAVI).METHODS: In a retrospective single center cohort study we determ...AIM: To determine the impact of red blood cell distribution width on outcome in anemic patients undergoing transcatheter aortic valve implantation(TAVI).METHODS: In a retrospective single center cohort study we determined the impact of baseline red cell distribution width(RDW) and anemia on outcome in 376 patients with aortic stenosis undergoing TAVI. All patients were discussed in the institutional heart team and declined for surgical aortic valve replacement due to high operative risk. Collected data included patient characteristics, imaging findings, periprocedural in hospital data, laboratory results and follow up data. Blood samples for hematology and biochemistry analysis were taken from every patient before and at fixed intervals up to 72 h after TAVI including blood count and creatinine. Descriptive statistics were used for patient's characteristics. KaplanMeier survival curves were used for time to event outcomes. A recursive partitioning regression and classification was used to investigate the association between potential risk factors and outcome variables.RESULTS: Mean age in our study population was 81 ± 6.1 years. Anemia was prevalent in 63.6%(n = 239) of our patients. Age and creatinine were identified as risk factors for anemia. In our study population, anemia per se did influence 30-d mortality but did not predict longterm mortality. In contrast, a RDW > 14% showed to be highly predictable for a reduced short- and longterm survival in patients with aortic valve disease after TAVI procedure.CONCLUSION: Age and kidney function determine the degree of anemia. The anisocytosis of red blood cells in anemic patients supplements prognostic information in addition to that derived from the WHO-based definition of anemia.展开更多
目的探讨单核细胞/高密度脂蛋白胆固醇比值(monocyte to high density lipoprotein cholesterol,MHR)、红细胞分布宽度(red blood cell distribution width,RDW)、尿酸(Serum uric acid,SUA)与冠心病(Coronary heart disease,CHD)患者...目的探讨单核细胞/高密度脂蛋白胆固醇比值(monocyte to high density lipoprotein cholesterol,MHR)、红细胞分布宽度(red blood cell distribution width,RDW)、尿酸(Serum uric acid,SUA)与冠心病(Coronary heart disease,CHD)患者冠状动脉病变严重程度的相关性。方法纳入2022年2月至2023年2月于我院收治的358例患者,分为正常对照组(n=70)和冠心病组(n=288),冠心病组根据Gensini积分结果进一步分为轻度狭窄组、中度狭窄组、重度狭窄组3个亚组,比较各组一般资料和MHR、RDW、SUA水平的差异,并进行Logistic回归评价MHR、RDW、SUA与不同冠状动脉狭窄程度相关性,绘制受试者工作特征(ROC)曲线分析MHR、RDW、SUA对冠状动脉狭窄程度的临床诊断价值。结果3亚组高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)、MHR、RDW、SUA比较差异均有统计学意义(P<0.05),Spearman相关性分析显示,3亚组MHR、RDW、SUA水平与冠状动脉狭窄程度呈正相关(P<0.05),HDL-C水平与冠状动脉狭窄程度呈负相关(P<0.05);Logistic回归分析显示,MHR、RDW、SUA均是冠心病患者冠状动脉病变严重程度的独立危险因素。(P<0.05)。ROC曲线分析显示,MHR、RDW、SUA预测冠状动脉病变严重程度的曲线下边面积(AUC)分别为0.611、0.778、0.769。结论在冠心病患者中,MHR、RDW、SUA水平均是冠状动脉病变严重程度的独立危险因素。展开更多
基金supported by the National Basic Research Program of China(2009CB219605)the National Natural Science Foundation of China(41074040)
文摘By means of reasonable assumption and mathematical derivation, a theoretic expression of flow rate for a single fracture with linearly varying width was obtained. The mathematical derivation was based on the cubic law and the new theoretic expression was an extention of traditional parallel plate model. This study may help to analyze seepage in fractured rock mass.
文摘A precise model has been developed for studying the inBuence of metallic nanoparticles on blood Row through catheterized tapered elastic arteries with radially varying magnetic field.The model is solved under the mild stenosis approximation by considering blood as viscous fluid.The influence of different Bow parameters associated with this problem such as Hartmann number,nanoparticle volume fraction,Grashof number and heat source or sink parameter is analyzed by plotting the graphs of the wall shear stress,resistance impedance to blood flow and stream lines.The inEuence of the radially varying magnetic field on resistance impedance to Bow is analyzed and it is observed that the signiBcantly strong magnetic force tends to increase in resistance.
文摘AIM: To determine the impact of red blood cell distribution width on outcome in anemic patients undergoing transcatheter aortic valve implantation(TAVI).METHODS: In a retrospective single center cohort study we determined the impact of baseline red cell distribution width(RDW) and anemia on outcome in 376 patients with aortic stenosis undergoing TAVI. All patients were discussed in the institutional heart team and declined for surgical aortic valve replacement due to high operative risk. Collected data included patient characteristics, imaging findings, periprocedural in hospital data, laboratory results and follow up data. Blood samples for hematology and biochemistry analysis were taken from every patient before and at fixed intervals up to 72 h after TAVI including blood count and creatinine. Descriptive statistics were used for patient's characteristics. KaplanMeier survival curves were used for time to event outcomes. A recursive partitioning regression and classification was used to investigate the association between potential risk factors and outcome variables.RESULTS: Mean age in our study population was 81 ± 6.1 years. Anemia was prevalent in 63.6%(n = 239) of our patients. Age and creatinine were identified as risk factors for anemia. In our study population, anemia per se did influence 30-d mortality but did not predict longterm mortality. In contrast, a RDW > 14% showed to be highly predictable for a reduced short- and longterm survival in patients with aortic valve disease after TAVI procedure.CONCLUSION: Age and kidney function determine the degree of anemia. The anisocytosis of red blood cells in anemic patients supplements prognostic information in addition to that derived from the WHO-based definition of anemia.
文摘目的探讨单核细胞/高密度脂蛋白胆固醇比值(monocyte to high density lipoprotein cholesterol,MHR)、红细胞分布宽度(red blood cell distribution width,RDW)、尿酸(Serum uric acid,SUA)与冠心病(Coronary heart disease,CHD)患者冠状动脉病变严重程度的相关性。方法纳入2022年2月至2023年2月于我院收治的358例患者,分为正常对照组(n=70)和冠心病组(n=288),冠心病组根据Gensini积分结果进一步分为轻度狭窄组、中度狭窄组、重度狭窄组3个亚组,比较各组一般资料和MHR、RDW、SUA水平的差异,并进行Logistic回归评价MHR、RDW、SUA与不同冠状动脉狭窄程度相关性,绘制受试者工作特征(ROC)曲线分析MHR、RDW、SUA对冠状动脉狭窄程度的临床诊断价值。结果3亚组高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)、MHR、RDW、SUA比较差异均有统计学意义(P<0.05),Spearman相关性分析显示,3亚组MHR、RDW、SUA水平与冠状动脉狭窄程度呈正相关(P<0.05),HDL-C水平与冠状动脉狭窄程度呈负相关(P<0.05);Logistic回归分析显示,MHR、RDW、SUA均是冠心病患者冠状动脉病变严重程度的独立危险因素。(P<0.05)。ROC曲线分析显示,MHR、RDW、SUA预测冠状动脉病变严重程度的曲线下边面积(AUC)分别为0.611、0.778、0.769。结论在冠心病患者中,MHR、RDW、SUA水平均是冠状动脉病变严重程度的独立危险因素。
