目的探讨两种气囊压力带在辅助下肢深静脉血栓(DVT)溶栓治疗中阻断浅静脉的压力值范围,既能有效溶解血栓又能提高患者舒适度,为实施个体化、规范护理流程提供依据。方法 80例下肢DVT患者分为改良型气囊压力带组(研究组)和传统表式血压...目的探讨两种气囊压力带在辅助下肢深静脉血栓(DVT)溶栓治疗中阻断浅静脉的压力值范围,既能有效溶解血栓又能提高患者舒适度,为实施个体化、规范护理流程提供依据。方法 80例下肢DVT患者分为改良型气囊压力带组(研究组)和传统表式血压计袖带组(对照组),每组40例,两组均行输液泵持续泵入尿激酶经足背静脉顺行溶栓治疗,每日尿激酶用量相同。两组患者阻断下肢浅静脉血流的压力值在下肢静脉造影时测定,即下肢深静脉显影时的气囊压力值。对比分析两组患者的腿围消肿率、平均血栓清除率及舒适度等指标。结果研究组下肢浅静脉血流阻断压力为65~75 mm Hg,平均(70±5)mm Hg;对照组下肢浅静脉血流阻断压力值为60~85 mm Hg,平均值(70±10)mm Hg。两组患者的腿围消肿率、不同时间点的平均血栓清除率、舒适度评分均存在显著差异(P<0.05),研究组均优于对照组。结论与传统表式血压计袖带相比,应用改良型气囊压力带阻断下肢浅静脉血流可以获得较好的溶栓疗效,且治疗过程中患者舒适度较高。展开更多
Background:Hemodialysis(HD) per se is a risk factor for thrombosis.Considering the growing body of evidence on blood-flow restriction(BFR) exercise in HD patients,identification of possible risk factors related to the...Background:Hemodialysis(HD) per se is a risk factor for thrombosis.Considering the growing body of evidence on blood-flow restriction(BFR) exercise in HD patients,identification of possible risk factors related to the prothrombotic agent D-dimer is required for the safety and feasibility of this training model.The aim of the present study was to identify risk factors associated with higher D-dimer levels and to determine the acute effect of resistance exercise(RE) with BFR on this molecule.Methods:Two hundred and six HD patients volunteered for this study(all with a glomerular filtration rate of <15 mL/min/1.73 m2).The RE+BFR session consisted of 50% arterial occlusion pressure during 50 min sessions of HD(intradialytic exercise).RE repetitions included concentric and eccentric lifting phases(each lasting 2 s) and were supervised by a strength and conditioning specialist.Results:Several variables were associated with elevated levels of D-dimer,including higher blood glucose,citrate use,recent cardiovascular events,recent intercurrents,higher inflammatory status,catheter as vascular access,older patients(>70 years old),and HD vintage.Furthermore,RE+BFR significantly increases D-dimer after 4 h.Patients with borderline baseline D-dimer levels(400-490 ng/mL) displayed increased risk of elevating D-dimer over the normal range(≥500 ng/mL).Conclusion:These results identified factors associated with a heightened prothrombotic state and may assist in the screening process for HD patients who wish to undergo RE+BFR.D-dimer and/or other fibrinolysis factors should be assessed at baseline and throughout the protocol as a precautionary measure to maximize safety during RE+BFR.展开更多
Background and aims:Hepatocellular carcinoma is one of the most common cancers worldwide.Previous studies have reported he influence of various hepatic blood flow occlusions on tumor behavior,which is mainly mediated ...Background and aims:Hepatocellular carcinoma is one of the most common cancers worldwide.Previous studies have reported he influence of various hepatic blood flow occlusions on tumor behavior,which is mainly mediated by liver ischemia-reperfusion.Although some genes and pathways have been determined,the whole transcriptome after various hepatic blood flow occlusions is lacking.Methods:We systematically explored transcriptome changes after various hepatic blood flow occlusions,including sham operation(SO;n=10),occlusion of the portal triad(OPT;n=10),and occlusion of the portal vein(OPV;n=10),by RNA-sequencing.Results:HE sections and TUNEL assays showed different liver injury among groups.We identified the top altered genes and pathways.Compared with the SO group,96 genes were altered in OPV,with 81 upregulated and 15 downregulated genes.The top 5 upregulated genes were Pdk4,Serpina12,Depp1,Igfbp1,and Mup22.The top 5 downregulated genes were Sprr1a,Serpinb2,Tnc,Cdkn3,and Cenpu.Compared with the SO group,there were 20 differentially expressed genes in OPT,with 18 upregulated and 2 downregulated genes.The top 5 upregulated genes wereC7,Zbtb16,Gabrp,Pdk4,and Mmrn1.The top 2 downregulated genes were Krt20 and Sis.Compared with the OPV group,72 differentially expressed genes were in OPT,with 39 upregulated and 33 downregulated genes.The top 5 upregulated genes wereHspa1b,Hbb-bs,Phf19,Ddias,and Rad54b.The top 5 downregulated genes were Cish,Socs2,Slc25a30,Rgs3,and Hsd3b5.Conclusion:Various surgical methods have an obvious influence on the transcriptome of tumors.展开更多
BACKGROUND Hepatic portal blood flow occlusion is a common technique for reducing hepatic hemorrhage during hepatectomy.We designed a novel Y-Z magnetic hepatic portal blocking band(Y-Z MHPBB)based on the principle of...BACKGROUND Hepatic portal blood flow occlusion is a common technique for reducing hepatic hemorrhage during hepatectomy.We designed a novel Y-Z magnetic hepatic portal blocking band(Y-Z MHPBB)based on the principle of magnetic compression technique.AIM To introduce the Y-Z MHPBB device and verify the feasibility of this device for hepatic portal blood flow occlusion in dogs.METHODS Ten beagles were randomly divided into the experimental group and control group.The operation time,intraoperative blood loss,the number of portal blood flow occlusions,the total time spent on adjusting the blocking band,and the average time spent on adjusting the blocking band were recorded.The surgeons evaluated the feasibility and flexibility of the two portal occlusion devices.RESULTS Laparoscopic hepatectomy was successfully performed in both the experimental group and control group.There was no statistical difference between the two groups in the operation time,intraoperative blood loss,and the number of hepatic portal blood flow occlusions.With respect to the total time spent on adjusting the blocking band and the average time spent on adjusting the blocking band,the experimental group showed significantly better outcomes than the control group,with a statistical difference(P<0.05).The operators found that the Y-Z MHPBB was superior to the modified T-tube in terms of operational flexibility.CONCLUSION The Y-Z MHPBB seems to be an ingenious design,accurate blood flow occlusion effect,and good flexibility;and it can be used for hepatic portal blood flow occlusion during laparoscopic hepatectomy.展开更多
目的探讨半肝血流阻断在腹腔镜肝细胞癌(肝癌)切除中的安全性及疗效。方法回顾性分析2013年1月至2015年12月佛山市第一人民医院收治的23例腹腔镜肝癌切除术患者临床资料。患者均签署知情同意书,符合医学伦理学规定。根据第一肝门血流阻...目的探讨半肝血流阻断在腹腔镜肝细胞癌(肝癌)切除中的安全性及疗效。方法回顾性分析2013年1月至2015年12月佛山市第一人民医院收治的23例腹腔镜肝癌切除术患者临床资料。患者均签署知情同意书,符合医学伦理学规定。根据第一肝门血流阻断方式不同将患者分为半肝血流阻断组和Pringle组。其中半肝血流阻断组11例,男9例,女2例;年龄24~65岁,中位年龄46岁;采用腹腔镜下经肝门板半肝血流阻断。Pringle组12例,男10例,女2例;年龄31~66岁,中位年龄43岁;采用腹腔镜下Pringle法肝门血流阻断。观察两组患者术中、术后情况以及围手术期肝功能变化。两组肝功能、住院时间比较采用t检验。结果半肝血流阻断组术后7 d ALT、TB、ALB分别为(58±12)U/L、(29±2)μmol/L、(38±3)g/L,Pringle组相应为(80±24)U/L、(32±3)μmol/L、(34±4)g/L,差异有统计学意义(t=-2.739,-2.192,2.626;P<0.05)。半肝血流阻断组术后住院时间(5.9±0.9)d,明显短于Pringle组的(7.4±1.9)d(t=-2.382,P<0.05)。两组均无中转开腹,无发生围手术期死亡及肝衰竭、术后出血等严重并发症。结论腹腔镜肝癌切除术中采用半肝血流阻断安全、可行,与Pringle法相比,具有术后恢复快优势,是腹腔镜肝切除理想的肝血流阻断方法之一。展开更多
We report a fresh and simpler approach to the modelling of the kinetics of the polymerization of Hb SS in sickle cell patients that couples the kinetics and the hydrodynamics of blood flow in mechanistic understanding...We report a fresh and simpler approach to the modelling of the kinetics of the polymerization of Hb SS in sickle cell patients that couples the kinetics and the hydrodynamics of blood flow in mechanistic understanding of the process. The well-known two-step autocatalytic reaction scheme was used for the polymerization reaction with the assumption of simpler first-order reaction scheme for each stage. In addition, the forces acting on a particle in motion were also introduced to account for compelling settling of the red cells that lead to vessel occlusion (vaso-occlusion). A first attempt on the prediction of vessel blockage was made using this novel model. The time for the onset of the polymerization reaction was derived from hydrodynamic considerations and kinetics while the kinetic rate constants were obtained from the autocatalytic nature of the reaction. Experimental data for model validation were obtained from recruited SS patients and in vitro data of Hofrichter. Over 100 volunteers were recruited for participation in this work but less than 40% met the inclusion criteria. Participants were of age range 13 - 43 (with a mean of 26 ± 8 years) for SCD patients and 18 - 43 (with a mean of 28 ± 7 years) for control participants. Blood indices and Transcranial Doppler (TCD) test parameters of all participants were the principal parameters used for model validation. Constant k2/k1 ratios was obtained for individual in vivo/in vitro system. This ratio is unique for any individual, independent on protein sequence and also suggests the degree of expression of the symptoms of Sickle Cell Disease (SCD) with higher values reflecting greater propensity to pain crisis. Delay time, tD, was found to have an inverse relationship with the kinetic constant for the residual reaction, k1. Therefore, long delay times calculated, offer insight on why SCD patients are not in perpetual crises because enough time is provided the cells to escape microcirculation while keeping the residual reaction at the minimum. Sensitivity analys展开更多
The ophthalmic artery （OA） is a main branch of the internal carotid artery （ICA）. Severe internal carotidartery stenosis or occlusion may not only affect the blood supply to the brain, but may also cause OA insuff...The ophthalmic artery （OA） is a main branch of the internal carotid artery （ICA）. Severe internal carotidartery stenosis or occlusion may not only affect the blood supply to the brain, but may also cause OA insufficiency, leading to ocular ischemia. Therefore, research on the hemodynamic changes in the OA in patients with ICA stenosis or occlusion has increasingly attracted more ophthalmologists＇ attention.1 Transcranial Doppler （TCD） is simple and noninvasive, has been widely used in the inspection of cerebrovascular disease,展开更多
目的：研究肝脏血流控制优化方法的动物模型建立与其机制。方法建立3种不同阻断方式肝脏缺再灌注损伤模型，观察再灌注24 h 及7 d 实验动物存活率、肝断面出血量、肝组织内血流灌注压变化，结合病理学常规方法，筛选出一种优化的肝门血...目的：研究肝脏血流控制优化方法的动物模型建立与其机制。方法建立3种不同阻断方式肝脏缺再灌注损伤模型，观察再灌注24 h 及7 d 实验动物存活率、肝断面出血量、肝组织内血流灌注压变化，结合病理学常规方法，筛选出一种优化的肝门血流控制方式。结果再灌注24 h 存活率：Pringle 法组46．7％、半肝血流阻断组93．3％、尾状叶分流保留动脉阻断门静脉组100％；半肝血流阻断组与尾状叶分流保留动脉阻断门静脉组肝细胞受损率较 Pringle 法组明显降低；Pringle 法组阻断后肝内灌注压会突然上升至正常水平的3．4倍；3种阻断肝门血流控制法阻断肝脏血流后，肝断面仍然有一定的出血量。结论尾状叶分流保留动脉阻断门静脉血供方法，能明显降低由于肝门阻断引起的肝脏缺血再灌注损伤，是一种安全有效的肝门血流控制方法。展开更多
Blood flow restriction(BFR)during exercise bouts has been used to induce hypertrophy of skeletal muscle,even with low loads.However,the effects of BFR during the rest periods between sets are not known.We have tested ...Blood flow restriction(BFR)during exercise bouts has been used to induce hypertrophy of skeletal muscle,even with low loads.However,the effects of BFR during the rest periods between sets are not known.We have tested the hypothesis that BFR during rest periods between sets of high-intensity resistance training would enhance performance.Twenty-two young adult male university students were recruited for the current study,with n=11 assigned to BFR and n=11 to a control group.The results revealed that four weeks training at 70%of 1 RM,five sets and 10 repetitions,three times a week with and without BFR,resulted in similar progress in maximal strength and in the number of maximal repetitions.The miR-1 and miR-133a decreased significantly in the vastus lateralis muscle of BFR group compared to the group without BFR,while no significant differences in the levels of miR133b,miR206,miR486,and miR499 were found between groups.In conclusion,it seems that BFR restrictions during rest periods of high-intensity resistance training,do not provide benefit for enhanced performance after a four-week training program.However,BFR-induced downregulation of miR-1 and miR-133a might cause different adaptive responses of skeletal muscle to high intensity resistance training.展开更多
To assess the relationship between cochlear blood flow (CBF) and auditory function, a procedure of intravital microscopy for observations of the lateral wall vessels of the cochlea coupled with the simultaneous measur...To assess the relationship between cochlear blood flow (CBF) and auditory function, a procedure of intravital microscopy for observations of the lateral wall vessels of the cochlea coupled with the simultaneous measurement of the endocochlear potential (EP) was established in guinea pigs with gradual ischemia of the cochlea. It was found that occlusions of both common carotid arteries and one of the vertebral arteries produced a minor reduction in CBF with no significant alteration in the EP. When intravenous infusion of ATP induced sharp and severe decreases in CBF, the EP varied only slightly from the baseline in some animals while there were no alteration in others. Furthermore, ATP infusions combined with arterial occlusions caused even more severe declines in CBF and a moderate decrease in the EP. The results indicate that not only does the CBF satisfy the basic needs of the processes of cochlear function, but also has a regulatory mechanism to ensure the normal function of the cochlea in the ischemia condition. It was also found that the changes in the stria vascularis vessels induced by decreases in blood pressure (BP) and heart rates were more severe than those of the spiral ligament vessels. This phenomenon indicated that the stria vascularis vessels were more sensitive to decreases of BP and heart rates.展开更多
Electroacupuncture has been shown to improve cerebral blood flow in animal models of stroke. However, it is unclear whether electroacupuncture alters mi RNA expression in the cortex. In this study, we examined changes...Electroacupuncture has been shown to improve cerebral blood flow in animal models of stroke. However, it is unclear whether electroacupuncture alters mi RNA expression in the cortex. In this study, we examined changes in the cerebral cortical mi RNA profile, cerebral blood flow and neurological function induced by electroacupuncture in a rat model of stroke. Electroacupuncture was performed at Renzhong（GV26） and Neiguan（PC6）, with a frequency of 2 Hz, continuous wave, current intensity of 3.0 m A, and stimulation time of 1 minute. Electroacupuncture increased cerebral blood flow and alleviated neurological impairment in the rats. mi RNA microarray profiling revealed that the vascular endothelial growth factor signaling pathway, which links cell proliferation with stroke, was most significantly affected by electroacupuncture. Electroacupuncture induced changes in expression of rno-mi R-206-3p, rno-mi R-3473, rno-mi R-6216 and rno-mi R-494-3p, and these changes were confirmed by quantitative real-time polymerase chain reaction. Our findings suggest that changes in cell proliferation-associated mi RNA expression induced by electroacupuncture might be associated with the improved cerebral blood supply and functional recovery following stroke.展开更多
文摘目的探讨两种气囊压力带在辅助下肢深静脉血栓(DVT)溶栓治疗中阻断浅静脉的压力值范围,既能有效溶解血栓又能提高患者舒适度,为实施个体化、规范护理流程提供依据。方法 80例下肢DVT患者分为改良型气囊压力带组(研究组)和传统表式血压计袖带组(对照组),每组40例,两组均行输液泵持续泵入尿激酶经足背静脉顺行溶栓治疗,每日尿激酶用量相同。两组患者阻断下肢浅静脉血流的压力值在下肢静脉造影时测定,即下肢深静脉显影时的气囊压力值。对比分析两组患者的腿围消肿率、平均血栓清除率及舒适度等指标。结果研究组下肢浅静脉血流阻断压力为65~75 mm Hg,平均(70±5)mm Hg;对照组下肢浅静脉血流阻断压力值为60~85 mm Hg,平均值(70±10)mm Hg。两组患者的腿围消肿率、不同时间点的平均血栓清除率、舒适度评分均存在显著差异(P<0.05),研究组均优于对照组。结论与传统表式血压计袖带相比,应用改良型气囊压力带阻断下肢浅静脉血流可以获得较好的溶栓疗效,且治疗过程中患者舒适度较高。
基金supported by a grant provided by the Coordenacao de Aperfeicoamento de Pessoal de Nível Superior-Brazil-Finance Code 001 and National Council for Scientific and Technological Developmentfinanced in part by the Conselho Nacional de Desenvolvimento Científico e Tecnológico and Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil--Finance Code 001funded by the Fundacao de Apoio à Pesquisa do Distrito Federal with grants from demanda espontanea-Edital 09/2022
文摘Background:Hemodialysis(HD) per se is a risk factor for thrombosis.Considering the growing body of evidence on blood-flow restriction(BFR) exercise in HD patients,identification of possible risk factors related to the prothrombotic agent D-dimer is required for the safety and feasibility of this training model.The aim of the present study was to identify risk factors associated with higher D-dimer levels and to determine the acute effect of resistance exercise(RE) with BFR on this molecule.Methods:Two hundred and six HD patients volunteered for this study(all with a glomerular filtration rate of <15 mL/min/1.73 m2).The RE+BFR session consisted of 50% arterial occlusion pressure during 50 min sessions of HD(intradialytic exercise).RE repetitions included concentric and eccentric lifting phases(each lasting 2 s) and were supervised by a strength and conditioning specialist.Results:Several variables were associated with elevated levels of D-dimer,including higher blood glucose,citrate use,recent cardiovascular events,recent intercurrents,higher inflammatory status,catheter as vascular access,older patients(>70 years old),and HD vintage.Furthermore,RE+BFR significantly increases D-dimer after 4 h.Patients with borderline baseline D-dimer levels(400-490 ng/mL) displayed increased risk of elevating D-dimer over the normal range(≥500 ng/mL).Conclusion:These results identified factors associated with a heightened prothrombotic state and may assist in the screening process for HD patients who wish to undergo RE+BFR.D-dimer and/or other fibrinolysis factors should be assessed at baseline and throughout the protocol as a precautionary measure to maximize safety during RE+BFR.
基金supported by the Beijing Natural Science Foundation of China(7202235).
文摘Background and aims:Hepatocellular carcinoma is one of the most common cancers worldwide.Previous studies have reported he influence of various hepatic blood flow occlusions on tumor behavior,which is mainly mediated by liver ischemia-reperfusion.Although some genes and pathways have been determined,the whole transcriptome after various hepatic blood flow occlusions is lacking.Methods:We systematically explored transcriptome changes after various hepatic blood flow occlusions,including sham operation(SO;n=10),occlusion of the portal triad(OPT;n=10),and occlusion of the portal vein(OPV;n=10),by RNA-sequencing.Results:HE sections and TUNEL assays showed different liver injury among groups.We identified the top altered genes and pathways.Compared with the SO group,96 genes were altered in OPV,with 81 upregulated and 15 downregulated genes.The top 5 upregulated genes were Pdk4,Serpina12,Depp1,Igfbp1,and Mup22.The top 5 downregulated genes were Sprr1a,Serpinb2,Tnc,Cdkn3,and Cenpu.Compared with the SO group,there were 20 differentially expressed genes in OPT,with 18 upregulated and 2 downregulated genes.The top 5 upregulated genes wereC7,Zbtb16,Gabrp,Pdk4,and Mmrn1.The top 2 downregulated genes were Krt20 and Sis.Compared with the OPV group,72 differentially expressed genes were in OPT,with 39 upregulated and 33 downregulated genes.The top 5 upregulated genes wereHspa1b,Hbb-bs,Phf19,Ddias,and Rad54b.The top 5 downregulated genes were Cish,Socs2,Slc25a30,Rgs3,and Hsd3b5.Conclusion:Various surgical methods have an obvious influence on the transcriptome of tumors.
基金Institutional Foundation of The First Affiliated Hospital of Xi’an Jiaotong University(to Yan XP),No.2022MS-07。
文摘BACKGROUND Hepatic portal blood flow occlusion is a common technique for reducing hepatic hemorrhage during hepatectomy.We designed a novel Y-Z magnetic hepatic portal blocking band(Y-Z MHPBB)based on the principle of magnetic compression technique.AIM To introduce the Y-Z MHPBB device and verify the feasibility of this device for hepatic portal blood flow occlusion in dogs.METHODS Ten beagles were randomly divided into the experimental group and control group.The operation time,intraoperative blood loss,the number of portal blood flow occlusions,the total time spent on adjusting the blocking band,and the average time spent on adjusting the blocking band were recorded.The surgeons evaluated the feasibility and flexibility of the two portal occlusion devices.RESULTS Laparoscopic hepatectomy was successfully performed in both the experimental group and control group.There was no statistical difference between the two groups in the operation time,intraoperative blood loss,and the number of hepatic portal blood flow occlusions.With respect to the total time spent on adjusting the blocking band and the average time spent on adjusting the blocking band,the experimental group showed significantly better outcomes than the control group,with a statistical difference(P<0.05).The operators found that the Y-Z MHPBB was superior to the modified T-tube in terms of operational flexibility.CONCLUSION The Y-Z MHPBB seems to be an ingenious design,accurate blood flow occlusion effect,and good flexibility;and it can be used for hepatic portal blood flow occlusion during laparoscopic hepatectomy.
文摘目的探讨半肝血流阻断在腹腔镜肝细胞癌(肝癌)切除中的安全性及疗效。方法回顾性分析2013年1月至2015年12月佛山市第一人民医院收治的23例腹腔镜肝癌切除术患者临床资料。患者均签署知情同意书,符合医学伦理学规定。根据第一肝门血流阻断方式不同将患者分为半肝血流阻断组和Pringle组。其中半肝血流阻断组11例,男9例,女2例;年龄24~65岁,中位年龄46岁;采用腹腔镜下经肝门板半肝血流阻断。Pringle组12例,男10例,女2例;年龄31~66岁,中位年龄43岁;采用腹腔镜下Pringle法肝门血流阻断。观察两组患者术中、术后情况以及围手术期肝功能变化。两组肝功能、住院时间比较采用t检验。结果半肝血流阻断组术后7 d ALT、TB、ALB分别为(58±12)U/L、(29±2)μmol/L、(38±3)g/L,Pringle组相应为(80±24)U/L、(32±3)μmol/L、(34±4)g/L,差异有统计学意义(t=-2.739,-2.192,2.626;P<0.05)。半肝血流阻断组术后住院时间(5.9±0.9)d,明显短于Pringle组的(7.4±1.9)d(t=-2.382,P<0.05)。两组均无中转开腹,无发生围手术期死亡及肝衰竭、术后出血等严重并发症。结论腹腔镜肝癌切除术中采用半肝血流阻断安全、可行,与Pringle法相比,具有术后恢复快优势,是腹腔镜肝切除理想的肝血流阻断方法之一。
文摘We report a fresh and simpler approach to the modelling of the kinetics of the polymerization of Hb SS in sickle cell patients that couples the kinetics and the hydrodynamics of blood flow in mechanistic understanding of the process. The well-known two-step autocatalytic reaction scheme was used for the polymerization reaction with the assumption of simpler first-order reaction scheme for each stage. In addition, the forces acting on a particle in motion were also introduced to account for compelling settling of the red cells that lead to vessel occlusion (vaso-occlusion). A first attempt on the prediction of vessel blockage was made using this novel model. The time for the onset of the polymerization reaction was derived from hydrodynamic considerations and kinetics while the kinetic rate constants were obtained from the autocatalytic nature of the reaction. Experimental data for model validation were obtained from recruited SS patients and in vitro data of Hofrichter. Over 100 volunteers were recruited for participation in this work but less than 40% met the inclusion criteria. Participants were of age range 13 - 43 (with a mean of 26 ± 8 years) for SCD patients and 18 - 43 (with a mean of 28 ± 7 years) for control participants. Blood indices and Transcranial Doppler (TCD) test parameters of all participants were the principal parameters used for model validation. Constant k2/k1 ratios was obtained for individual in vivo/in vitro system. This ratio is unique for any individual, independent on protein sequence and also suggests the degree of expression of the symptoms of Sickle Cell Disease (SCD) with higher values reflecting greater propensity to pain crisis. Delay time, tD, was found to have an inverse relationship with the kinetic constant for the residual reaction, k1. Therefore, long delay times calculated, offer insight on why SCD patients are not in perpetual crises because enough time is provided the cells to escape microcirculation while keeping the residual reaction at the minimum. Sensitivity analys
基金This study was supported by grants from the National Natural Science Foundation of China ＂Study on protective mechanism of the retinal ganglial cell （RGE） of ocular ischemic syndrome （OIS）＂ （No. 81173412）, Beijing Natural Science Foundation ＂Study on correlation between the hemodynamic changes of ocular ischemic syndrome and Toll-like receptors signal pathway （No. 7122046）, and Capital Medical Academy of Key Laboratory Ophthalmology Open Research Topic ＂Study on injury mechanism of the retinal ganglial cell （RGE） of ocular ischemic syndrome （OIS）＇.
文摘The ophthalmic artery （OA） is a main branch of the internal carotid artery （ICA）. Severe internal carotidartery stenosis or occlusion may not only affect the blood supply to the brain, but may also cause OA insufficiency, leading to ocular ischemia. Therefore, research on the hemodynamic changes in the OA in patients with ICA stenosis or occlusion has increasingly attracted more ophthalmologists＇ attention.1 Transcranial Doppler （TCD） is simple and noninvasive, has been widely used in the inspection of cerebrovascular disease,
文摘目的：研究肝脏血流控制优化方法的动物模型建立与其机制。方法建立3种不同阻断方式肝脏缺再灌注损伤模型，观察再灌注24 h 及7 d 实验动物存活率、肝断面出血量、肝组织内血流灌注压变化，结合病理学常规方法，筛选出一种优化的肝门血流控制方式。结果再灌注24 h 存活率：Pringle 法组46．7％、半肝血流阻断组93．3％、尾状叶分流保留动脉阻断门静脉组100％；半肝血流阻断组与尾状叶分流保留动脉阻断门静脉组肝细胞受损率较 Pringle 法组明显降低；Pringle 法组阻断后肝内灌注压会突然上升至正常水平的3．4倍；3种阻断肝门血流控制法阻断肝脏血流后，肝断面仍然有一定的出血量。结论尾状叶分流保留动脉阻断门静脉血供方法，能明显降低由于肝门阻断引起的肝脏缺血再灌注损伤，是一种安全有效的肝门血流控制方法。
文摘Blood flow restriction(BFR)during exercise bouts has been used to induce hypertrophy of skeletal muscle,even with low loads.However,the effects of BFR during the rest periods between sets are not known.We have tested the hypothesis that BFR during rest periods between sets of high-intensity resistance training would enhance performance.Twenty-two young adult male university students were recruited for the current study,with n=11 assigned to BFR and n=11 to a control group.The results revealed that four weeks training at 70%of 1 RM,five sets and 10 repetitions,three times a week with and without BFR,resulted in similar progress in maximal strength and in the number of maximal repetitions.The miR-1 and miR-133a decreased significantly in the vastus lateralis muscle of BFR group compared to the group without BFR,while no significant differences in the levels of miR133b,miR206,miR486,and miR499 were found between groups.In conclusion,it seems that BFR restrictions during rest periods of high-intensity resistance training,do not provide benefit for enhanced performance after a four-week training program.However,BFR-induced downregulation of miR-1 and miR-133a might cause different adaptive responses of skeletal muscle to high intensity resistance training.
文摘To assess the relationship between cochlear blood flow (CBF) and auditory function, a procedure of intravital microscopy for observations of the lateral wall vessels of the cochlea coupled with the simultaneous measurement of the endocochlear potential (EP) was established in guinea pigs with gradual ischemia of the cochlea. It was found that occlusions of both common carotid arteries and one of the vertebral arteries produced a minor reduction in CBF with no significant alteration in the EP. When intravenous infusion of ATP induced sharp and severe decreases in CBF, the EP varied only slightly from the baseline in some animals while there were no alteration in others. Furthermore, ATP infusions combined with arterial occlusions caused even more severe declines in CBF and a moderate decrease in the EP. The results indicate that not only does the CBF satisfy the basic needs of the processes of cochlear function, but also has a regulatory mechanism to ensure the normal function of the cochlea in the ischemia condition. It was also found that the changes in the stria vascularis vessels induced by decreases in blood pressure (BP) and heart rates were more severe than those of the spiral ligament vessels. This phenomenon indicated that the stria vascularis vessels were more sensitive to decreases of BP and heart rates.
基金supported by the National Natural Science Foundation of China,No.81173416
文摘Electroacupuncture has been shown to improve cerebral blood flow in animal models of stroke. However, it is unclear whether electroacupuncture alters mi RNA expression in the cortex. In this study, we examined changes in the cerebral cortical mi RNA profile, cerebral blood flow and neurological function induced by electroacupuncture in a rat model of stroke. Electroacupuncture was performed at Renzhong（GV26） and Neiguan（PC6）, with a frequency of 2 Hz, continuous wave, current intensity of 3.0 m A, and stimulation time of 1 minute. Electroacupuncture increased cerebral blood flow and alleviated neurological impairment in the rats. mi RNA microarray profiling revealed that the vascular endothelial growth factor signaling pathway, which links cell proliferation with stroke, was most significantly affected by electroacupuncture. Electroacupuncture induced changes in expression of rno-mi R-206-3p, rno-mi R-3473, rno-mi R-6216 and rno-mi R-494-3p, and these changes were confirmed by quantitative real-time polymerase chain reaction. Our findings suggest that changes in cell proliferation-associated mi RNA expression induced by electroacupuncture might be associated with the improved cerebral blood supply and functional recovery following stroke.
