Notch1 is a mechanosensitive endothelial receptor that responds to vascular wall shear stress.However,data on Notch1 activity in humans remains limited,particularly regarding its role in endothelial function.Objective...Notch1 is a mechanosensitive endothelial receptor that responds to vascular wall shear stress.However,data on Notch1 activity in humans remains limited,particularly regarding its role in endothelial function.Objectives:Accordingly,the purpose of this study was to determine whether Notch1 is associated with the flow-mediated dilatory(FMD)response and whether it is related to aerobic fitness.A secondary purpose was to determine whether Notch1 is related to concentrations of vascular endothelial growth factor(VEGF).Methods:Sixteen(8M/8F)young(20-30 yrs old)and healthy(BMI:25±4.2 kg/m^(2),blood pressure:117±11.63/69±11.25 mmHg)adults participated in the study.Aerobic fitness was determined by cycle VO_(2) peak.An FMDwas performed on the brachial artery,and blood samples were taken from an antecubital vein at rest(baseline)and 1min after cuff deflation(to align with peak vessel dilation).Concentrations of Notch1 extracellular domain(NECD)and VEGFwere determined from plasma using enzyme-linked immunosorbent assays.Results:In contrast to our hypothesis,concentrations of NECD and VEGF did not change throughout the FMDandwere unrelated to allometrically scaled FMD values(p all>0.05).Likewise,there was no relationship between changes inNECD and VEGF(p=0.331,r=0.127).However,the change in NECD across the FMD was moderately(r=0.515)and significantly(p=0.024)correlated with VO_(2) peak.Conclusions:These novel data indicate that in healthy young adults,Notch1 activity is linked to aerobic fitness but may not be acutely involved in the shear-mediated vasodilatory response.展开更多
Background: Many factors can contribute to atherosclerotic-type vascular changes in older individuals or men. Thus, confining the investigation to young women with no clinical evidence of the condition could enhance u...Background: Many factors can contribute to atherosclerotic-type vascular changes in older individuals or men. Thus, confining the investigation to young women with no clinical evidence of the condition could enhance understanding of the early stages of cardiovascular disease. The aim of this study was to determine whether carotid mean/max intima-media thickness (IMT) and brachial flow-mediated dilation (FMD) values, which are well-known event-related indices, are associated with laboratory data and the other vascular indices of atherosclerosis in healthy young women. Methods: Carotid mean/max IMT and brachial FMD were measured in young women with no clinical evidence of atherosclerosis (n = 110;mean age, 39 years) who were instructed not to eat, drink or smoke after 9 PM the evening before testing. All participants also underwent laboratory assessment, including simultaneous measurements of arterial stiffness such as augmentation index (AI), cardioankle vascular index (CAVI) and brachial-ankle pulse wave velocity (baPWV). Results: Mean IMT was signifi-cantly and positively associated with age (p = 0.002), CAVI (p = 0.044), low-density lipoprotein-cholesterol (LDL-C, p = 0.047) and high-sensitive C-reactive protein (hs-CRP, p = 0.002) values but was not related to FMD, AI, baPWV or triglycerides (TG) in the multivariate regression analysis. Similarly, max IMT was positively associated with age (p p = 0.003) and hs-CRP (p = 0.005) values but was not related to FMD, AI, CAVI, baPWV, TG or blood pressure level in the multivariate regression analysis. The association between LDL-C and max IMT was much stronger than that between LDL-C and mean IMT. Brachial FMD was positively associated only with heart rate in the multivariate regression analysis. Conclusions: These results suggest that mean IMT more closely represents the sclerotic aspect of vascular change, whereas max IMT represents the atherotic aspect in healthy young women. Although the relationship between the autonomic nervous system and heart rate is well-known, there may be a complex interaction between the autonomic nervous system and endothelial function.展开更多
目的探讨超声心动图联合心肌标志物检测对扩张型心肌病(dilated cardiomyopathy,DCM)的诊断价值。方法选取120例疑似DCM患者,以心脏磁共振成像(cardiac magnetic resonance,CMR)作为金标准,将其分为观察组(DCM患者,75例)与对照组(非DCM...目的探讨超声心动图联合心肌标志物检测对扩张型心肌病(dilated cardiomyopathy,DCM)的诊断价值。方法选取120例疑似DCM患者,以心脏磁共振成像(cardiac magnetic resonance,CMR)作为金标准,将其分为观察组(DCM患者,75例)与对照组(非DCM患者,45例)。分析超声心动图对DCM的检出率;比较两组患者的超声心动图指标;对比两组心肌标志物水平;采用ROC曲线分析评估超声心动图联合心肌标志物对DCM的诊断效能。结果超声心动图对DCM的检出率为82.67%。观察组的左心室舒张末期内径(LVEDD)和左心室收缩末期内径(LVESD)均显著高于对照组,左心室射血分数(LVEF)显著低于对照组(均P<0.05)。观察组的N末端B型利钠肽前体(NT-proBNP)和心肌肌钙蛋白I(cTnI)水平均显著高于对照组(均P<0.05)。超声心动图联合心肌标志物检测诊断DCM的AUC值为0.954,敏感性为94.67%,特异性为93.33%,显著高于单一检测(P<0.05)。结论超声心动图联合心肌标志物检测对DCM具有较高的诊断价值。展开更多
Background Carotid artery intima-media thickness （CIMT） and brachial artery flow-mediated dilation percentage （FMD%） are common parameters used for detecting subclinical atherosclerosis. This study compared subcli...Background Carotid artery intima-media thickness （CIMT） and brachial artery flow-mediated dilation percentage （FMD%） are common parameters used for detecting subclinical atherosclerosis. This study compared subclinical atherosclerosis of the carotid and brachial arteries in rheumatoid arthritis （RA） patients and healthy controls using high resolution ultrasonography. We also investigated their correlation with clinical factors and the association between FMD% and CIMT.展开更多
Aim: The aim of this study was to determine the effect of training on endothelium-dependent vasodilatation in patients with coronary artery disease (CAD) after revascularization and healthy young men. Background: Impa...Aim: The aim of this study was to determine the effect of training on endothelium-dependent vasodilatation in patients with coronary artery disease (CAD) after revascularization and healthy young men. Background: Impaired endothelial function has been observed in patients with CAD and those with CAD risk factors. Studies have shown that exercise can enhance endothelial function. Methods: This experimental cross-sectional study was conducted on patients with CAD (3 months after CABG and PCI) and students of medical school in 2011. Endothelium dependent dilation of the brachial artery was determined by using high-resolution vascular ultrasonography through flow-mediated vasodilatation (FMD) after induction of ischemia, and the data were analyzed using SPSS, dependent t-test and ANCOVA. Findings: The findings showed that at baseline, FMD was reduced in revascularized patients, when compared with healthy young men, after 8 weeks, and exercise training significantly improved FMD in patients underwent training group [from 4.31 ± 1.45 (SD)% to 6.15 ± 0.773 (SD)%, p p ed unchanged, and even after aerobic training, it did not significantly modify the brachial artery diameter in these groups. Conclusion: Our study demonstrates that endothelial dysfunction persisting in CAD patients after revascularization and aerobic training can improve endothelial function in different vascular beds in CAD patients and healthy young men. This may contribute to the benefit of regular exercise in preventing and restricting cardiovascular disease.展开更多
The endothelium modulates vascular homeostasis owing to a variety of vasoconstrictors and vasodilators.Endothelial dysfunction(ED),characterized by impaired vasodilation,inflammation,and thrombosis,triggers future car...The endothelium modulates vascular homeostasis owing to a variety of vasoconstrictors and vasodilators.Endothelial dysfunction(ED),characterized by impaired vasodilation,inflammation,and thrombosis,triggers future cardiovascular(CV)diseases.Chronic kidney disease,a state of chronic inflammation caused by oxidative stress,metabolic abnormalities,infection,and uremic toxins damages the endothelium.ED is also associated with a decline in estimated glomerular filtration rate.After kidney transplantation,endothelial functions undergo immediate but partial restoration,promising graft longevity and enhanced CV health.However,the anticipated CV outcomes do not happen due to various transplant-related and unrelated risk factors for ED,culminating in poor CV health and graft survival.ED in kidney transplant recipients is an underrecognized and poorly studied entity.CV diseases are the leading cause of death among kidney transplant candidates with functioning grafts.ED contributes to the pathogenesis of many of the CV diseases.Various biomarkers and vasoreactivity tests are available to study endothelial functions.With an increasing number of transplants happening every year,and improved graft rejection rates due to the availability of effective immunosuppressants,the focus has now shifted to endothelial protection for the prevention,early recognition,and treatment of CV diseases.展开更多
目的评价经皮微创气管切开术(PDT)在ICU危重病人救治中的临床应用价值。方法我院ICU符合气管切开指征无禁忌证的患者70例,随机分为经皮微创气管切开术组(PDT组)29例和传统开放式气管切开术组(OT组)41例,比较两组间在手术时间、切口大小...目的评价经皮微创气管切开术(PDT)在ICU危重病人救治中的临床应用价值。方法我院ICU符合气管切开指征无禁忌证的患者70例,随机分为经皮微创气管切开术组(PDT组)29例和传统开放式气管切开术组(OT组)41例,比较两组间在手术时间、切口大小、出血量、并发症等方面的差异。结果 PDT组手术时间较OT组明显缩短(11.28±3.48 min VS22.95±4.67 min,P=0.00);切口明显减小(1.60±0.21 cm VS 4.09±0.74 cm,P=0.00),出血量(6.46±3.74 ml VS 26.68±11.07 ml,P=0.00)及切口感染机率较OT组明显减少(0%VS 14.6%,P=0.031),差异均有统计学意义(P<0.05)。结论PDT具有省时、创伤小、并发症低等优势,对救治重危病人具有较大的应用价值。展开更多
基金supported by the Natural Sciences and Engineering Research Council of Canada(NSERC)Discovery Grant,held by Dr.Bain(RGPIN-2020-05760).
文摘Notch1 is a mechanosensitive endothelial receptor that responds to vascular wall shear stress.However,data on Notch1 activity in humans remains limited,particularly regarding its role in endothelial function.Objectives:Accordingly,the purpose of this study was to determine whether Notch1 is associated with the flow-mediated dilatory(FMD)response and whether it is related to aerobic fitness.A secondary purpose was to determine whether Notch1 is related to concentrations of vascular endothelial growth factor(VEGF).Methods:Sixteen(8M/8F)young(20-30 yrs old)and healthy(BMI:25±4.2 kg/m^(2),blood pressure:117±11.63/69±11.25 mmHg)adults participated in the study.Aerobic fitness was determined by cycle VO_(2) peak.An FMDwas performed on the brachial artery,and blood samples were taken from an antecubital vein at rest(baseline)and 1min after cuff deflation(to align with peak vessel dilation).Concentrations of Notch1 extracellular domain(NECD)and VEGFwere determined from plasma using enzyme-linked immunosorbent assays.Results:In contrast to our hypothesis,concentrations of NECD and VEGF did not change throughout the FMDandwere unrelated to allometrically scaled FMD values(p all>0.05).Likewise,there was no relationship between changes inNECD and VEGF(p=0.331,r=0.127).However,the change in NECD across the FMD was moderately(r=0.515)and significantly(p=0.024)correlated with VO_(2) peak.Conclusions:These novel data indicate that in healthy young adults,Notch1 activity is linked to aerobic fitness but may not be acutely involved in the shear-mediated vasodilatory response.
文摘Background: Many factors can contribute to atherosclerotic-type vascular changes in older individuals or men. Thus, confining the investigation to young women with no clinical evidence of the condition could enhance understanding of the early stages of cardiovascular disease. The aim of this study was to determine whether carotid mean/max intima-media thickness (IMT) and brachial flow-mediated dilation (FMD) values, which are well-known event-related indices, are associated with laboratory data and the other vascular indices of atherosclerosis in healthy young women. Methods: Carotid mean/max IMT and brachial FMD were measured in young women with no clinical evidence of atherosclerosis (n = 110;mean age, 39 years) who were instructed not to eat, drink or smoke after 9 PM the evening before testing. All participants also underwent laboratory assessment, including simultaneous measurements of arterial stiffness such as augmentation index (AI), cardioankle vascular index (CAVI) and brachial-ankle pulse wave velocity (baPWV). Results: Mean IMT was signifi-cantly and positively associated with age (p = 0.002), CAVI (p = 0.044), low-density lipoprotein-cholesterol (LDL-C, p = 0.047) and high-sensitive C-reactive protein (hs-CRP, p = 0.002) values but was not related to FMD, AI, baPWV or triglycerides (TG) in the multivariate regression analysis. Similarly, max IMT was positively associated with age (p p = 0.003) and hs-CRP (p = 0.005) values but was not related to FMD, AI, CAVI, baPWV, TG or blood pressure level in the multivariate regression analysis. The association between LDL-C and max IMT was much stronger than that between LDL-C and mean IMT. Brachial FMD was positively associated only with heart rate in the multivariate regression analysis. Conclusions: These results suggest that mean IMT more closely represents the sclerotic aspect of vascular change, whereas max IMT represents the atherotic aspect in healthy young women. Although the relationship between the autonomic nervous system and heart rate is well-known, there may be a complex interaction between the autonomic nervous system and endothelial function.
文摘目的探讨超声心动图联合心肌标志物检测对扩张型心肌病(dilated cardiomyopathy,DCM)的诊断价值。方法选取120例疑似DCM患者,以心脏磁共振成像(cardiac magnetic resonance,CMR)作为金标准,将其分为观察组(DCM患者,75例)与对照组(非DCM患者,45例)。分析超声心动图对DCM的检出率;比较两组患者的超声心动图指标;对比两组心肌标志物水平;采用ROC曲线分析评估超声心动图联合心肌标志物对DCM的诊断效能。结果超声心动图对DCM的检出率为82.67%。观察组的左心室舒张末期内径(LVEDD)和左心室收缩末期内径(LVESD)均显著高于对照组,左心室射血分数(LVEF)显著低于对照组(均P<0.05)。观察组的N末端B型利钠肽前体(NT-proBNP)和心肌肌钙蛋白I(cTnI)水平均显著高于对照组(均P<0.05)。超声心动图联合心肌标志物检测诊断DCM的AUC值为0.954,敏感性为94.67%,特异性为93.33%,显著高于单一检测(P<0.05)。结论超声心动图联合心肌标志物检测对DCM具有较高的诊断价值。
文摘Background Carotid artery intima-media thickness （CIMT） and brachial artery flow-mediated dilation percentage （FMD%） are common parameters used for detecting subclinical atherosclerosis. This study compared subclinical atherosclerosis of the carotid and brachial arteries in rheumatoid arthritis （RA） patients and healthy controls using high resolution ultrasonography. We also investigated their correlation with clinical factors and the association between FMD% and CIMT.
文摘Aim: The aim of this study was to determine the effect of training on endothelium-dependent vasodilatation in patients with coronary artery disease (CAD) after revascularization and healthy young men. Background: Impaired endothelial function has been observed in patients with CAD and those with CAD risk factors. Studies have shown that exercise can enhance endothelial function. Methods: This experimental cross-sectional study was conducted on patients with CAD (3 months after CABG and PCI) and students of medical school in 2011. Endothelium dependent dilation of the brachial artery was determined by using high-resolution vascular ultrasonography through flow-mediated vasodilatation (FMD) after induction of ischemia, and the data were analyzed using SPSS, dependent t-test and ANCOVA. Findings: The findings showed that at baseline, FMD was reduced in revascularized patients, when compared with healthy young men, after 8 weeks, and exercise training significantly improved FMD in patients underwent training group [from 4.31 ± 1.45 (SD)% to 6.15 ± 0.773 (SD)%, p p ed unchanged, and even after aerobic training, it did not significantly modify the brachial artery diameter in these groups. Conclusion: Our study demonstrates that endothelial dysfunction persisting in CAD patients after revascularization and aerobic training can improve endothelial function in different vascular beds in CAD patients and healthy young men. This may contribute to the benefit of regular exercise in preventing and restricting cardiovascular disease.
文摘The endothelium modulates vascular homeostasis owing to a variety of vasoconstrictors and vasodilators.Endothelial dysfunction(ED),characterized by impaired vasodilation,inflammation,and thrombosis,triggers future cardiovascular(CV)diseases.Chronic kidney disease,a state of chronic inflammation caused by oxidative stress,metabolic abnormalities,infection,and uremic toxins damages the endothelium.ED is also associated with a decline in estimated glomerular filtration rate.After kidney transplantation,endothelial functions undergo immediate but partial restoration,promising graft longevity and enhanced CV health.However,the anticipated CV outcomes do not happen due to various transplant-related and unrelated risk factors for ED,culminating in poor CV health and graft survival.ED in kidney transplant recipients is an underrecognized and poorly studied entity.CV diseases are the leading cause of death among kidney transplant candidates with functioning grafts.ED contributes to the pathogenesis of many of the CV diseases.Various biomarkers and vasoreactivity tests are available to study endothelial functions.With an increasing number of transplants happening every year,and improved graft rejection rates due to the availability of effective immunosuppressants,the focus has now shifted to endothelial protection for the prevention,early recognition,and treatment of CV diseases.
文摘目的评价经皮微创气管切开术(PDT)在ICU危重病人救治中的临床应用价值。方法我院ICU符合气管切开指征无禁忌证的患者70例,随机分为经皮微创气管切开术组(PDT组)29例和传统开放式气管切开术组(OT组)41例,比较两组间在手术时间、切口大小、出血量、并发症等方面的差异。结果 PDT组手术时间较OT组明显缩短(11.28±3.48 min VS22.95±4.67 min,P=0.00);切口明显减小(1.60±0.21 cm VS 4.09±0.74 cm,P=0.00),出血量(6.46±3.74 ml VS 26.68±11.07 ml,P=0.00)及切口感染机率较OT组明显减少(0%VS 14.6%,P=0.031),差异均有统计学意义(P<0.05)。结论PDT具有省时、创伤小、并发症低等优势,对救治重危病人具有较大的应用价值。
