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Compressive Strength of Basic Magnesium Sulfate Cement Coral Aggregate Concrete(MCAC)on Non-Destructive Testing
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作者 GUO Jianbo YU Hongfa +3 位作者 MA Haiyan CHANG Yun MEI Qiquan ZHANG Yan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第5期1086-1095,共10页
Basic magnesium sulfate cement coral aggregate concrete(MCAC)is a new type of concrete consisting of basic magnesium sulfate cement,coarse coral aggregate,coral reef sand and seawater.The rebound hammer(RH),the ultras... Basic magnesium sulfate cement coral aggregate concrete(MCAC)is a new type of concrete consisting of basic magnesium sulfate cement,coarse coral aggregate,coral reef sand and seawater.The rebound hammer(RH),the ultrasonic pulse velocity(UPV)and the compressive strength(fcu)tests of 14 sets of cube specimens of the MCAC after 28 d of aging were conducted.The impact of the content and length of sisal fiber on the relationship between the fcu-RH and the fcu-UPV was determined.A mathematical model was established to predict the strength of the MCAC using the UPV,RH,and comprehensive UPV/RH methods and to obtain the curves of test strength.The applicability of the test strength curves of ordinary portland concrete(OPC),light-weight aggregate concrete(LAC),and coral aggregate concrete(CAC)to MCAC was assessed.The results showed that the test strength curves of OPC,LAC and CAC were inappropriate to determine the strength of MCAC using non-destructive method.The relative standard error of the curves of test strength of the RH method and the comprehensive method met the specifications,whereas that of the UPV method did not. 展开更多
关键词 non-destructive testing basic magnesium sulfate cement coral aggregate corcrete ultrasonic pulse velocity rebound hammer specific test strength curves
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Using Magnesium Sulfate to Prevent Atrial Fibrillation after Coronary Artery Bypass Grafting Surgery: A Single Centre Experience in Bangladesh
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作者 Manoj Tiwari Md. Abir Tazim Chowdhury +5 位作者 Hema Poudel Munama Magdum Md. Mostafizur Rahman Vivek Kumar Jha Md. Ahaduzzaman Md. Abul Bashar Maruf 《World Journal of Cardiovascular Diseases》 2023年第9期565-577,共13页
Background: Atrial fibrillation commonly occurs following cardiac surgery, particularly after coronary artery bypass grafting. Magnesium, known for its stabilizing effect on cell membranes, has shown promise in preven... Background: Atrial fibrillation commonly occurs following cardiac surgery, particularly after coronary artery bypass grafting. Magnesium, known for its stabilizing effect on cell membranes, has shown promise in preventing postoperative atrial fibrillation. This study aimed to assess the impact of intravenous magnesium infusion in preventing atrial fibrillation after off-pump coronary artery bypass grafting, where maintaining stable cell membranes is crucial in averting this complication. Methods: A cross-sectional study was conducted at the Department of Cardiac Surgery, Bangabandhu Sheikh Mujib Medical University, from March 2020 to February 2022. Sixty-six patients who underwent off-pump coronary artery bypass grafting were enrolled and divided into two groups. Group A (n = 33) received intravenous magnesium sulfate (10 mmol/2.47gm) for three days after surgery, while Group B (n = 33) did not receive magnesium sulfate. Postoperative atrial fibrillation occurrence in the Intensive Care Unit (ICU) within three days after surgery was evaluated using convenient sampling. Statistical analysis was performed with SPSS version 26.0, utilizing independent Student’s t-test for continuous data and Chi-square and Fisher’s exact test for categorical data. A p-value of ≤0.05 was considered statistically significant. Results: No significant differences in age or gender were observed between the two groups. Group B exhibited significantly lower magnesium levels than Group A on the 0<sup>th</sup>, 1<sup>st</sup>, 2<sup>nd</sup>, and 3<sup>rd</sup> days post-surgery. Additionally, Group B experienced a higher incidence of postoperative atrial fibrillation, longer ICU stays, and two mortalities. The study did not detect any adverse effects associated with magnesium infusion. Conclusion: It has been demonstrated that administering magnesium intravenously after off-pump coronary artery bypass grafting can lower the chances of developing atrial fibrillation. This demonstrates the potential advantages of using magnesium as a preventative measure for postoperative atrial fibrillation in such cases. 展开更多
关键词 Atrial Fibrillation (AF) Coronary Artery Bypass Grafting (CABG) Postopera-tive Atrial Fibrillation (POAF) magnesium sulfate Bangladesh.
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Leaching characteristics of ion-adsorption type rare earths ore with magnesium sulfate 被引量:24
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作者 肖燕飞 陈迎迎 +4 位作者 冯宗玉 黄小卫 黄莉 龙志奇 崔大立 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第11期3784-3790,共7页
Magnesium sulfate was proposed to be leaching agent to deal with the ion-adsorption type rare earths ore to reduce or even eliminate ammonia?nitrogen emissions. The effects of temperature, particle size and stirring s... Magnesium sulfate was proposed to be leaching agent to deal with the ion-adsorption type rare earths ore to reduce or even eliminate ammonia?nitrogen emissions. The effects of temperature, particle size and stirring speed on rare earth leaching process and the leaching behaviors of the single rare earth element were investigated in order to reveal the rare earth leaching characteristics. Besides, the comparison of leaching effects between magnesium sulfate and ammonium sulfate was also studied. The results showed that the rare earth leaching process could be well described with inner diffusion control model and the apparent activation energy was 9.48 kJ/mol. The leaching behaviors of the single rare earth element were brought into correspondence with rare earths. Moreover, when the concentration of leaching agent was 0.20 mol/L, the rare earth leaching efficiency could all reach above 95% and the leaching efficiency of aluminum impurities could be restrained by 10% using magnesium sulfate compared with ammonium sulfate. 展开更多
关键词 rare earth leaching agent kinetics magnesium sulfate ion-adsorption type rare earths ore
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Influence of magnesium and aluminum salts on hydrolysis of titanyl sulfate solution
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作者 方富强 刘亚辉 +3 位作者 孟凡成 王伟菁 薛天艳 齐涛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3475-3483,共9页
The influence of magnesium and aluminum salts as impurities on the hydrolysis of titanyl sulfate was investigated.The degree of TiOSO4 conversion to hydrated titanium dioxide(HTD) and the particle size of HTD were m... The influence of magnesium and aluminum salts as impurities on the hydrolysis of titanyl sulfate was investigated.The degree of TiOSO4 conversion to hydrated titanium dioxide(HTD) and the particle size of HTD were measured as functions of the concentrations of MgSO4 and Al2(SO4)3 in the TiOSO4 solution.The Boltzmann growth model,which focuses on two main parameters,namely the concentrations of Mg2+ and Al3+(ρ(Mg2+) and ρ(Al3+),respectively),fits the data from the hydrolysis process well with R20.988.The samples were characterized by ICP,SEM,XRD,and laser particle size analyzer.It is found that the addition of Mg SO4 simultaneously improves the hydrolysis ratio and the hydrolysis rate,especially when F(the mass ratio of H2SO4 to TiO2) is high,hydrolysis ratio increases from 42.8% to 83.0%,whereas the addition of Al2(SO4)3 has negligible effect on the chemical kinetics of HTD precipitation during the hydrolysis process,hydrolysis ratio increases from 42.8% to 51.9%.An investigation on the particle size of HTD reveals that the addition of Mg SO4 and Al2(SO4)3 clearly increases the size of the crystallites and decreases the size of the aggregates. 展开更多
关键词 titanyl sulfate solution hydrolysis process growth model magnesium sulfate aluminum sulfate particle size
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Leaching behaviors of calcium and magnesium in ion-adsorption rare earth tailings with magnesium sulfate 被引量:10
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作者 Bo FAN Long-sheng ZHAO +4 位作者 Zong-yu FENG De-peng LIU Wei-Qiang YIN Zhi-qi LONG Xiao-wei HUANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第1期288-296,共9页
The leaching behaviors of calcium and magnesium in the rare earth tailings leached with magnesium sulfate using deionized water,CaCl2 solution and lime water were investigated.Experimental data indicated that magnesiu... The leaching behaviors of calcium and magnesium in the rare earth tailings leached with magnesium sulfate using deionized water,CaCl2 solution and lime water were investigated.Experimental data indicated that magnesium in the tailings was easy to be leached out since most of the magnesium was in the form of water-soluble phase.Most of calcium in the lime water was electrostatically adsorbed on the clay mineral of the tailings,and the water-soluble magnesium was also gradually converted into exchangeable phase because of back-adsorption of Mg2+on the clay mineral with increasing the pH values.When the liquid-to-solid ratio was 0.80,the contents of readily-available magnesium and calcium were 104.4−207.6 and 201.7−1426.3 mg/kg,respectively,which could meet the requirements for plants.These results suggest a promising route for the environmental remediation of ion-adsorption rare earth ore after in-situ leaching. 展开更多
关键词 ion-adsorption rare earth ore magnesium sulfate environmental remediation leaching behaviors lime water
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Magnesium sulfate and fetal neuroprotection: overview of clinical evidence 被引量:5
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作者 Clément Chollat Stéphane Marret 《Neural Regeneration Research》 SCIE CAS CSCD 2018年第12期2044-2049,共6页
Antenatal administration of magnesium sulfate is an important part of the neuroprotective strategy for preterm infants. Strong evidence from five randomized controlled trials and five meta-analyses has demonstrated th... Antenatal administration of magnesium sulfate is an important part of the neuroprotective strategy for preterm infants. Strong evidence from five randomized controlled trials and five meta-analyses has demonstrated that magnesium sulfate, when administered before preterm delivery, significantly reduces the risk of cerebral palsy at two years. Through secondary analyses of randomized controlled trials and other original clinical studies, this state-of-the-art review highlights the absence of serious adverse effects in both pregnant women and neonates, as well as the impact of maternal body mass index and preeclamptic status on the maternal and neonatal magnesium levels, which could influence the magnitude of the neuroprotective effect. Although antenatal magnesium sulfate is a cost-effective strategy, some practice surveys have demonstrated that the use of magnesium sulfate is not sufficient and that its use is heterogeneous, differing among different maternity wards. Since 2010, an increasing number of obstetrical societies have recommended its use to improve the neurological outcomes of preterm infants, especially the International Federation of Gynecology and Obstetrics and World Health Organization in 2015, and France in 2017. Considering the neuroprotective impact of magnesium sulfate when administered before delivery, postnatal administration should be considered, and its effects should be assessed using randomized controlled trials. 展开更多
关键词 magnesium sulfate preterm birth NEUROPROTECTION cerebral palsy NEURODEVELOPMENT international recommendations clinical studies meta-analysis PREECLAMPSIA COST-EFFECTIVENESS
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Effect of Limestone Powder and Fly Ash on Magnesium Sulfate Resistance of Mortar 被引量:6
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作者 刘数华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第4期700-703,共4页
The effect of limestone powder and fly ash on magnesium sulfate resistance of mortar was studied by testing on the strength, expansion and hydration products of the specimens stored in MgSO4 solution at certain period... The effect of limestone powder and fly ash on magnesium sulfate resistance of mortar was studied by testing on the strength, expansion and hydration products of the specimens stored in MgSO4 solution at certain periods. The experimental results show that the strength of mortar stored in MgSO4 solution increases a little before 28 d, but decreases fast subsequently. The more the contents of limestone powder and fly ash, the less the strength losses. Mortar swells in the MgSO4 solution with the soaking time. And the more the contents of limestone powder and fly ash, the less the expansion rate is. The expansion or strength loss of mortars results from the expansion of gypsum, as well as the loss of Ca(OH)2 and other hydration products of cement. The magnesium sulfate resistance of the mortars containing limestone powder and fly ash is high. 展开更多
关键词 limestone powder fly ash MORTAR magnesium sulfate resistance
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Research on the Evaporating Crystalization Behavior of the Magnesium Sulfate Subtypes Brine at High Temperature 被引量:1
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作者 XIE Shaolei ZHANG Chao +2 位作者 WANG Xiaohan JING Yan JIA Yongzhong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期387-387,共1页
Research the evaporating crystalization process of the magnesium sulfate subtypes brine at high temperature from Dalangtan salt lake in Qinghai province.It was revealed that the salt lake is a typical subtype magnesium
关键词 magnesium sulfate subtypes brine EVAPORATING crystallization law of salts phase diagram application
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Comparative effect of intrathecal meperidine,tramadol,magnesium sulfate,and dexmedetomidine on preventing post-spinal anesthesia shivering and adverse events in hip fracture repair patients:A randomized clinical trial 被引量:1
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作者 Mansoreh Kokhaei Hesameddin Modir +1 位作者 Esmail Moshiri Mehran Azami 《Journal of Acute Disease》 2022年第6期222-227,共6页
Objective:To compare effect of intrathecal meperidine,tramadol,magnesium sulfate,and dexmedetomidine on the prevention of post-spinal anesthesia shivering and adverse events in hip fracture repair patients.Methods:In ... Objective:To compare effect of intrathecal meperidine,tramadol,magnesium sulfate,and dexmedetomidine on the prevention of post-spinal anesthesia shivering and adverse events in hip fracture repair patients.Methods:In a randomized,double-blind trial,132 patients with American Society of Anesthesiology(ASA)ⅠandⅡspinal anesthesia who needed hip fracture surgery were enrolled.Patients were stratified into 4 intervention groups based on a randomized block pattern:meperidine,tramadol,magnesium sulfate,and dexmedetomidine.Hemodynamic parameters including blood pressure,heart rate,and oxygen saturation,as well as the severity of shivering,core body temperature,Ramsay sedation score,adverse events,meperidine consumption were recorded and compared.Results:There was no statistically significant difference in the normal hemodynamic parameters,temperature,duration of surgery,meperidine consumption,and adverse events such as dizziness,hypotension,nausea,and bradycardia among groups(P>0.05).Compared to other groups,severity of shivering was the lower in the dexmedetomidine group 6 and 8 h after surgery.The Ramsay sedation scores were higher in the dexmedetomidine and meperidine groups 4 h after surgery(P=0.020).Conclusion:Dexmedetomidine acts better than the other three adjuvants in reducing complications such as shivering.Overall,these four adjuvants are helpful to prevent postoperative shivering and could be put forward as promising local anesthetics in spinal anesthesia,based on anesthesiologists’discretion and patients’general conditions.Clinical registration:The study was approved by the Research and Ethics Committee at the Valiasr Hospital(Arak,Iran)with the clinical trial code of IRCT20141209020258N153. 展开更多
关键词 DEXMEDETOMIDINE Hip fracture Intrathecal injec-tion magnesium sulfate MEPERIDINE SHIVERING SPINAL TRAMADOL
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Interventional effect of magnesium sulfate on nitric oxide synthase activity after acute craniocerebral injury 被引量:1
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作者 Ximin Yang Jiangong Zhu Zongchun Tang 《Neural Regeneration Research》 SCIE CAS CSCD 2007年第4期251-253,共3页
BACKGROUND: Abnormal changes in magnesium ion are closely related to cerebral injury. At present, some evidence indicates that magnesium reagent can improve nerve function and prognosis of patients with cerebral inju... BACKGROUND: Abnormal changes in magnesium ion are closely related to cerebral injury. At present, some evidence indicates that magnesium reagent can improve nerve function and prognosis of patients with cerebral injury. OBJECTIVE: To observe the effect of magnesium sulfate on changes in nitric oxide synthase (NOS) activity in brain tissue of rats with acute craniocerebral injury. DESIGN: Completely randomized grouping design and randomly controlled study. SETTING: Laboratory of Neurosurgery, the Third Hospital of Chinese PLA. MATERIALS: Fifty-four male SD rats of clean grade and weighing 220 - 250 g were randomly divided into normal control group (n =6), cerebral injury group (n =24) and magnesium sulfate group (n =24). Especially, rats in cerebral injury group and magnesium sulfate group were equally divided into four subgroups and observed at 0.5, 2, 6 and 24 hours after model establishment. A solution of 125 g/L of magnesium sulfate was provided by the Seventh Pharmaceutical Factory of Wuxi and the NOS assay kit by Nanjing Jiancheng Bioengineering Institute. METHODS: The experiment was carried out in the Institute of Neurosurgery, the Third Hospital of Chinese PLA from August 2000 to August 2002. ① Rats in the cerebral injury group and magnesium sulfate group were anesthetized to establish cerebral injury models based on modified Feeney technique; magnesium sulfate group were intraperitoneally injected 600 mg/kg magnesium sulfate (125 g/L), but rats in the normal control group remained untreated. ② At 0.5, 2, 6 and 24 hours after cerebral injury, rats in cerebral injury group and magnesium sulfate group were decapitated and brains were dissected. Cerebral cortex of rats in cerebral injury group was selected for NOS assay; in addition, at 0.5 hour after cerebral injury, a portion of the parietal lobe was selected from the brains of rats in the normal control group. Brain samples were homogenized, the homogenated centrifuged and the supernatants were used to measure NOS activity with NOS kit. ③ Differences among the three groups were compared with t test. MAIN OUTCOME MEASURES: NOS activity in cerebral cortex of rats in each group. RESULTS: A total of 54 SD rats were involved in the final analysis. At 0.5 hour after cerebral injury, NOS activity in cerebral cortex was (42.45 ± 13.46) nmol/L in cerebral injury group and (41.17 ± 12.53) nmol/L in magnesium sulfate group, respectively, which was higher than that in normal control group [(39.45 ± 11.84) nmol/L, P 〈 0.05]. At 2 hours after cerebral injury, NOS activities were (66.48 ±21.43) and (63.24 ± 19.18) umol/L, respectively, while at 6 hours after cerebral injury, NOS activities were (62.45 ± 24.18) and (51.97 ±20.46) nmol/L, respectively, which were higher than those in normal control group (P 〈 0.0 1). At 24 hours after cerebral injury, NOS activity returned to basal level. Moreover, NOS activity was significantly lower in the magnesium sulfate group than that in the cerebral injury group at 2 and 6 hours after cerebral injury (P 〈 0.05, 0.01).CONCLUSION: NOS activity is increased in injured brain tissue of rats with craniocerebral injury, and treatment with magnesium sulfate provides some degrees of protection possibly through inhibition of NOS activity after cerebral injury. 展开更多
关键词 brain injuries nitric-oxide synthase magnesium sulfate
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Preparation of Adsorbent with Magnesium Sulfate and Straw Pulp Black Liquor and Its Phenol Adsorption Properties
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作者 GUO Lugang WANG Haizeng 《Journal of Ocean University of China》 SCIE CAS 2009年第3期229-232,共4页
A magnesia adsorbent was prepared from straw pulp black liquor and magnesium sulfate for the first time, and its adsorption of phenol from aqueous solution was examined. The characteristics of the adsorbent were teste... A magnesia adsorbent was prepared from straw pulp black liquor and magnesium sulfate for the first time, and its adsorption of phenol from aqueous solution was examined. The characteristics of the adsorbent were tested through chemical analysis, surface analysis, X-ray diffraction and FT-IR spectroscopy. The effects of various factors, such as dose, adsorption time and adsorption temperature, on phenol adsorption behavior were studied. The results show that the adsorption processes can be fitted to the isotherm Langmuir model very well. It was found that the adsorption process was strongly influenced by temperature and the optimal temperature for phenol removal was 40 ℃. The optimum adsorption time was 10 min, and desorption would happen afterwards. Between the models of Langmuir and Freundlich, the adsorption process of phenol onto magnesia fitted the Langmuir equation better. 展开更多
关键词 straw pulp black liquor magnesium sulfate ADSORBENT PHENOL
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Ab Initio and DFT Study of Magnesium Sulfate Contact Ion Pairs
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作者 张星辰 张韫宏 李前树 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期190-193,共4页
The stuctures of contact ion pairs of magnesium sulfate were studied. The geometries of contact ion pairs of MgSO 4(H 2O) n (n =1-6) were optimized by using Hartree Fock (HF/6 31+G *, HF/6 311+G ** ) and... The stuctures of contact ion pairs of magnesium sulfate were studied. The geometries of contact ion pairs of MgSO 4(H 2O) n (n =1-6) were optimized by using Hartree Fock (HF/6 31+G *, HF/6 311+G ** ) and density functional theory (DFT) (B3LYP/6 31+G *, B3LYP/6 311+G ** ) methods. The stable structures of monodentate, bidentate and tridentate contact ion pairs were obtained. The bidentate structure of contact ion pairs are the most stable compaired with the monodentate and tridentate ones for the same composition. The hydration enthalpies of contact ion pairs of MgSO 4 (H 2O) n (n =1-4) increase with their hydration numbers. 展开更多
关键词 contact ion pair magnesium sulfate aqueous solution ab initio density functional theory
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Comparison of impact of adjuvant treatment of midazolam, fentanyl, and magnesium sulfate with intrathecal bupivacaine on block characteristics and postoperative analgesia in knee arthroplasty: A randomized clinical trial
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作者 Hesameddin Modir Esmail Moshiri +1 位作者 Mehran Azami Tayebe Sadat Sayafi-Sharifi 《Journal of Acute Disease》 2022年第3期94-100,共7页
Objective:To compare the efficacy of midazolam,fentanyl,and magnesium sulfate as adjuvants to intrathecal bupivacaine on both block characteristics and postoperative analgesia in knee arthroplasty.Methods:This randomi... Objective:To compare the efficacy of midazolam,fentanyl,and magnesium sulfate as adjuvants to intrathecal bupivacaine on both block characteristics and postoperative analgesia in knee arthroplasty.Methods:This randomized double-blind clinical trial recruited spinal anesthesia patients of the American Society of Anesthesiologists classⅠorⅡ,who needed knee arthroplasty.Patients were stratified into three intervention groups,including the midazolam group,the fentanyl group,and the magnesium sulfate group,and the patients were administered with midazolam,fentanyl,and magnesium sulfate,respectively.Hemodynamic parameters,sensory and motor block,and pain score(Visual Analogue Scale)were measured and compared among the three groups.Results:A total of 105 patients were included in this study with 35 patients in each group.There was no statistically significant difference in terms of oxygen saturation,mean blood pressure,duration of surgery,and postoperative complications,including nausea,vomiting,bradycardia,dizziness,and hypotension,as well as the time of opioid administration among the three groups(P>0.05).Statistically significant differences were found in terms of heart rate at 15,30,45,60,75,and 105 min after beginning of operation among the three groups,which was lower in the midazolam group(P<0.05).The midazolam group showed a shorter time to achieve sensory block after spinal anesthesia,sensory block to T8 or higher and sensory block to T12 and L1(P<0.05).Besides,the three groups showed significantly differences in terms of onset of motor block after spinal anesthesia and time to achieve motor block to T8 or higher or Bromage score 3(P=0.001).No significant difference was noted in pain scores among the three groups(P>0.05).Conclusion:Midazolam resulted in a shorter time to achieve sensory and motor block to T8 or higher,the onset of motor block and sensory block after spinal anesthesia,and time to achieve sensory block to T12 and L1,and the pain scores were not significantly different among the groups.Thus,midazolam can be highly underlined,if a shorter onset of sensory and motor blocks is targeted.[Funded by the research deputy of Arak University of Medical Sciences(No.99258);fa.irct.ir number,IRCT20141209020258N164]. 展开更多
关键词 Block characteristics BUPIVACAINE FENTANYL Hemodynamic changes INTRATHECAL magnesium sulfate MIDAZOLAM
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Attack of Limestone Cement-based Material Exposed to Magnesium Sulfate Solution at Low Temperature
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作者 张风臣 WU Shengxing +2 位作者 FANG Yonghao ZHOU Jikai LI Zhonghua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第3期507-512,共6页
Limestone in cement could be a source of CO3^2- needed for thaumasite formation which will result in thanmasite form of sulfate attack (TSA) probably. TSA has more deterioration than ettringite or gypsum form of sul... Limestone in cement could be a source of CO3^2- needed for thaumasite formation which will result in thanmasite form of sulfate attack (TSA) probably. TSA has more deterioration than ettringite or gypsum form of sulfate attack because it targets the calcium silicate hydrates (C-S-H) which is the main binder phase in all Portland cement-based materials. By means of physical and mechanical property testing as well as erosion phases analysis, magnesium sulfate attack of cement-based material containing 35% limestone powder by mass at 5 ± 2 ℃ is investigated. The compressive strength and flexural strength of mortar specimen immersed in MgSO4 solution increase firstly, then decrease rapidly with the immersing age. Relative dynamic elastic modulus of mortar specimen changes in a phased process. After immersing in MgSO4 solution for 15 weeks, the main erosion phases in paste specimen change from four phases compounds, three phases compounds to two phases compounds from surface to inside. Deterioration course of limestone cement-based material exposed to magnesium sulfate aggressive environment appears progressive damage layer by layer, and every layer probably suffers four stages, which are property strengthening stage, initial degradation stage, thaumasite formation stage and cementation loss stage, respectively. 展开更多
关键词 limestone cement-based material THAUMASITE magnesium sulfate
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The Effects of Magnesium Sulfate on Fetal Rats of FGR and the Expression of Caspase-3 in the Placenta of Maternal Rat
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作者 高慧 邹丽 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2005年第6期718-720,共3页
To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat ; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish ... To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat ; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish model of FGR by a way of passive smoking: giving the maternal rats different agent of magnesium sulfate by subcutaneous injection: low agent group (300 mg/kg), high agent group (600 mg/kg). Concentration of magnesium sulfate was monitored. The expression of caspase-3 was measured by RT-PCR and immunohistochemistry technology. Both of the concentrations of magnesium sulfate in high and low agents group are higher than the FGR group (P〈0.01);the weight of the placenta and fetal rat in high agent group are higher than the FGR group (P〈0.05 and P〈0. 01) ; the expression of mRNA and protein of caspase-3 in the two agent group is higher than the FGR group (P〈0.05 respectively) ; concentration of magnesium sulfate in the maternal rat blood correlate to the weight of fetal rat (r=0. 899, P=0. 038) and the expression of caspase-3 in the placenta of maternal rat (r=-0. 747, P=0. 033; r=-0. 915, P=0. 001). The research suggests that the weight of fetal rat could be increased by treatment of magnesium sulfate. Because it would imfrmove the placental function by depressing the expression of caspase-3. 展开更多
关键词 magnesium sulfate FGR caspase-3
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Magnesium Sulfate Effect on Fetal Umbilical Artery and Middle Cerebral Artery Doppler Indicies in Women with Severe Preeclampsia and Eclampsia
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作者 Nermeen Mohamed Hefila 《Open Journal of Obstetrics and Gynecology》 2021年第5期636-645,共10页
<strong>Objective:</strong> <span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">To study</span><... <strong>Objective:</strong> <span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">To study</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">MgSO</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;"> effect</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">on fetal MCA and UA blood flow changes</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">using Doppler ultrasound</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">in cases of severe PET and eclampsia. </span><b><span style="font-family:Verdana;">Materials and Methods: </span></b><span style="font-family:Verdana;">A total of 40 patients with severe PET admitted to El-Shatby Maternity University Hospital, Alexandria (Egypt) were examined before and after administration of MgSO</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;"> using Doppler study to measure fetal MCA</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">and UA blood flow changes. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">After administration</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">of MgSO</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">, the mean</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">RI of UA, PI of UA showed a statistically significant decrease (P < 0.001) also the systolic-diastolic ratio (p = 0.001). Mean resistivity index (RI) cerebral showed a statistically significant increasing (P = 0.001), pulsatility index (PI)-cerebral and the systolic-diastolic ratio showed a statistically significant increasing (P < 0.001).</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">The</span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">C/U (cerebroumblical) ratio increased after the treatment (P < 0.001). </span><b><span style="font-family:Verdana;">Conclusions: </span></b><span style="font-family:Verdana;">Infusion of MgSO</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;"> significantly decreases the fetal RI, PI, SDR umbilical and increases the fetal RI, PI, SDR MCA and increases cerebroumblical ratio indices obtained by Doppler</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">examinations.</span></span></span> 展开更多
关键词 Doppler Ultrasound ECLAMPSIA magnesium sulfate PREECLAMPSIA
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The Impact of Adding Magnesium Sulfate to Bupivacaine versus Bupivacaine Alone in Fascia Iliaca Compartment Block in Burn Patients Undergoing Skin Grafting Procedures;Comparative Study
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作者 Sameh Ghareeb Yassen M. Amr +1 位作者 Rokaya Mohamed D. G. Diab 《Open Journal of Anesthesiology》 2021年第4期99-111,共13页
<b>Purpose:</b> The purpose of the study is to evaluate the analgesic effect of adding magnesium sulfate to bupivacaine in Fascia Iliaca Compartment Block (FI-CB). <b>Patients and Methods:</b> ... <b>Purpose:</b> The purpose of the study is to evaluate the analgesic effect of adding magnesium sulfate to bupivacaine in Fascia Iliaca Compartment Block (FI-CB). <b>Patients and Methods:</b> Ninety-six burn patients scheduled for skin-grafting procedures were allocated into two equal groups. After induction of general anaethesia, forty-eight patients received <b>US guided</b> FICB using 35 ml bupivacaine 0.25% + 5 ml isotonic sodium chloride solution with a total volume of 40 ml. The other forty-eight patients received 35 ml bupivacaine 0.25% + 250 mg of magnesium sulfate with a total volume of 40 ml. <b>Results:</b> Total postoperative pethidine consumption in the first 24 h post-operative showed a highly statistically significant decrease in the magnesium group in comparison to the bupivacaine group. <b>Conclusion:</b> Adding magnesium sulfate to bupivacaine in FICB in skin grafting procedures decreased the pain scores post-operative, delayed the first request of analgesia and reduced the total analgesic consumption in the first 24 h post-operative without any significant side effects. 展开更多
关键词 BUPIVACAINE magnesium sulfate Fascia Iliaca Block
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Protective Effects of Sodium Magnesium Fructose Diphosphate on Brain Damage of Rats Subjected to Focal Cerebral Ischemia and Reperfusion
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作者 董志 曾凡新 +2 位作者 周岐新 傅洁民 薛春生 《Journal of Chinese Pharmaceutical Sciences》 CAS 2002年第1期42-45,共4页
Objective: To study the effects of sodium magnesiusm fructose diphosphate(FDPM) on brain damage of rats after ischemia-reperfusion. Methods: Rats were subjected to cerebral ischemia-reperfusion induced by inserting a ... Objective: To study the effects of sodium magnesiusm fructose diphosphate(FDPM) on brain damage of rats after ischemia-reperfusion. Methods: Rats were subjected to cerebral ischemia-reperfusion induced by inserting a nylon thread into internal carotid artery to block the origin of middle cerebral artery and removing the thread later. FDPM (400 mg·kg -1), fructose-1,6-diphosphate (FDP, 400 mg·kg -1)and magnesium sulfate (MgSO 4, 30 mg·kg -1) were administrated 10 min after the onset of ischemia. Neurological scale, brain infarct area, Malondialdehyde(MDA) content and histopathological changes of brain tissue were studied. Results: FDPM decreased neurological scale, diminished brain infarct area, reduced MDA content and relieved histopathological change of rat brain tissue subjected to ischemia-reperfusion. These effects were more powerful than that of FDP or MgSO 4. Conclusions: It is suggested that FDPM markedly prevented rats against brain damage after cerebral ischemia-reperfusion, and its effect was better than that of FDP or MgSO 4. 展开更多
关键词 Sodium magnesium fructose diphosphate Cerebral ischemia FRUCTOSE-1 6-DIPHOSPHATE magnesium sulfate
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Physicochemical Study on the Interface Zone of Concrete Exposed to Different Sulfate Solutions 被引量:2
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作者 刘赞群 邓德华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第z1期167-174,共8页
This paper reports the results of the visual observations and micro-analysis of concrete core samples after 6 and 12 months of their exposure to sodium, ammonium and magnesium sulfate solutions with the same concentra... This paper reports the results of the visual observations and micro-analysis of concrete core samples after 6 and 12 months of their exposure to sodium, ammonium and magnesium sulfate solutions with the same concentration of sulfate ions. XRD, SEM and EDS were used for micro-analysis of the mi-crostructure and the composition of the interface zone in the samples. The results indicate that the deterioration of concrete by different sulfate solutions could proceed differently with regard to the mechanism and the mode of damage caused. The damage of concrete exposed to sodium sulfate solution is mainly caused by the gypsum crystals formed in the interface zone, which lead to expansion and cracking. In the case of concrete immersed in magnesium sulfate solutions, a layer of brucite (magnesium hydroxide) and gypsum was produced in the interface zone, which reduces the cohesiveness of the interface zone in concrete. For the concrete immersed in ammonium sulfate solutions, the conversation of mortar to some mush mass by ammonium ions and the formation of a large of gypsum occurred in the interface zone, consequently, serious softening of hydrated cement pastes and expansion and cracking of concrete are the characteristics of the attack by ammonium sulfate solutions. Also, it is considered that using drilled concrete core as samples to evaluate the sulfate resistance of concrete is a good and accelerated method. 展开更多
关键词 CONCRETE interface zone sulfate attack sodium sulfate magnesium sulfate ammonium sulfate
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Evaluation of the Fetal Neuroprotection Protocol with Magnesium Sulphate in a University Hospital in Burkina Faso
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作者 Timongo Francoise Danielle Millogo-Traoré Oumarou Sawadogo S. W. Zongo-Kondé 《Open Journal of Obstetrics and Gynecology》 CAS 2022年第10期1042-1055,共14页
Introduction: Prematurity continues to stand as a major public health issue worldwide and more particularly for low incomes countries like Burkina Faso. Indeed, it is the main cause of high death rate and infant morbi... Introduction: Prematurity continues to stand as a major public health issue worldwide and more particularly for low incomes countries like Burkina Faso. Indeed, it is the main cause of high death rate and infant morbidity, neurologic deficiencies being one of them. Objective: From March 1st to September 30th, 2020, evaluate the fetal neuroprotection protocol using sulfate magnesium during births before thirty-three (33) weeks of amenorrhea at the University Health Centers (UHC) of Yalgado Ouedraogo and Bogodogo in Ouagadougou, Burkina Faso. Patients and Methods: It was a prospective cohort survey, exposed or unexposed. The exposed ones are from the UHC of Yalgado Ouedraogo, while the unexposed ones are from the UHC of Bogodogo. Analysis of the results showed 87 newborns from the exposed and 180 from the unexposed. The mortality rate, as well as neonatal neurologic complications, was higher with unexposed than with exposed. Although antenatal exposure to magnesium sulfate was not statistically associated with mortality and morbidity in newborns at a threshold of 0.05%, it has shown an overall good neurological prognosis in newborns exposed. Conclusion: A survey of a large sample of the population would be relevant in order to better assess the determinants of this influence. Proposition: In light of the results, the use of magnesium sulfate for neuroprotective purposes could be considered in our countries. 展开更多
关键词 Premature Delivery Fetal Neuroprotection sulfates magnesium UHC of Yal-gado Ouedraogo UHC of Bogodogo Burkina Faso
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