To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the re...To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the rectifier circuit is introduced and the double closed-loop control strategy in three-phase stationary coordinate system is analyzed. For the deficiency of control strategy, the control strategy in two-phase synchronous rotating coordinate system is proposed. This makes the independent control of active current and reactive current to be realized. The simulation model of the PWM rectifier is built and the effectiveness of the control method proposed in this paper is verified by simulation.展开更多
With beta-lactam drugs and immunosuppressants widely used, the infection caused by Acinetobacter baumannfi （Ab） has become more and more serious with multidrug resistant Acinetobacter baumannfi （MDRAb） emerging an...With beta-lactam drugs and immunosuppressants widely used, the infection caused by Acinetobacter baumannfi （Ab） has become more and more serious with multidrug resistant Acinetobacter baumannfi （MDRAb） emerging and worsening rapidly. Compared with other patients, the incidence and multidrug resistance of MDRAb are higher in children in pediatric intensive care unit （PICU） because of immune deficiency, severe basic diseases, prolonged hospitalization and invasive operations. Hence it is significant to study the epidemiology and changes of antibacterial susceptibility in order to reduce the incidence of MDRAb in children. A total 115 patients with MDRAb pneumonia and 45 patients with negative MDRAb （NMDRAb） pneumonia who had been treated from January 2009 to August 2011 were studied retrospectively at the PICU of Wuhan Children＇s Hospital. Clinical data were analyzed with univariate and multivariate Logistic regression. In 176 clinical strains of Acinetobacter baumannfi isolated, there were 128 strains of MDRAb, accounting for 72.73%. Drug susceptibility tests showed that the resistance rates of 13-1actam antibiotics were more than 70% except for cefoperazone sulbactam. The rates to carbapenems were higher than 90%. They were significantly higher than those of NMDRAb. Amikacin, levofloxacin, ciprofloxacin and minocycline had the lowest drug-resistance rates （〈20%）. Multivariate Logistic regression revealed that ICU stay, the time of mechanical ventilation, anemia, hypoproteinemia and the use of carbapenems were independent risk factors for MDRAb pneumonia. MDRAb is an important opportunistic pathogen to pneumonia in PICU, and its drug-resistance is severe. It increases significantly the mortality of patients. It is important to take the effective prevention measures for controlling it.展开更多
Background and Aim: The absence of data in our context motivates this study aiming to determine the frequency of AHF at the ICU, assess the in-hospital evolution of the disease and to find out poor prognosis.Material ...Background and Aim: The absence of data in our context motivates this study aiming to determine the frequency of AHF at the ICU, assess the in-hospital evolution of the disease and to find out poor prognosis.Material and Methods: It was an observational and descriptive study covering the time from January 1, 2014 to March 30, 2017 involving all inpatient records in ICU. From January 2014 to December 2017, collected data included those on socio-demographic, history of diseases and physical examination, and some labor dataincluding Pro BNP, serum creatinine, blood ionogram,?cardiac enzymes and blood count. Also data electrocardiography, echocardiography and in-hospital evolution were collected. Statistical Analysis:Statistical analysis was performed using SPSS (IBM Inc) version 18. Results: AHF occured in 47.36% with a mean age of 58.74 ± 18.407 and extremes of 17 and 90 years, women representing 53.1% (sex ratio Male:Female = 0.88). Hypertension and diabetes were the predominant cardiovascular risk factors with respectively 67.4% and 18.4%. At admission?44%, 37.7% and 17.9% of patients were respectively hypertensive,?normotensive and hypotensive. The clinical expression was mainly global heart failure with 42.6% followed by left heart failure and right heart failure with respectively 37% and 20.4%. The coronary syndromes (all forms) was the first cause of ICA with 34% of cases followed by pulmonary embolism and hypertension with respectively 25.3% and 24.1%. Mean hospital stay was 5.61 ± 3.527 days (1 to 25 days). Complications were recorded in 18.5% of patients with cardiogenic shock in half of all cases. In multi-variate analysis, only hypotension at admission was shown to be the independent factor of poor prognosis with p = 0.016 and OR = 4.453 (1.322 - 14.996). Conclusion: As a common manifestation heart failure can be rapidly fatal in presence of collapsus or hypotension at admission. These factors should be accurately managed to reduce mortality, which remains high in our context.展开更多
<strong>Introduction:</strong> Cardiovascular diseases constitute the deadliest pathology in the world with 31% of global mortality in 2018. This is how we felt it necessary to conduct a study on cardiovas...<strong>Introduction:</strong> Cardiovascular diseases constitute the deadliest pathology in the world with 31% of global mortality in 2018. This is how we felt it necessary to conduct a study on cardiovascular diseases in emergency units of Senegal, more precisely in Dakar, in order to know epidemiological profile of these patients. <strong>Methods:</strong> The study setting was the reception and emergency units of the Hôpital de Pikine and Hôpital Principal de Dakar. This was an observational, descriptive cross-sectional study with an analytical aim to search for factors associated with the occurrence of cardiovascular disease. The study ran from January 25th to February 5th, 2018 at the Hôpital de Pikine and from February 25th to March 5th, 2018 at Hôpital Principal de Dakar. The source population consisted of patients over 18 years of age and not in a state of pregnancy, who were been received there and had given their free and informed consent to participate in the survey. A representative sample had drawn and a consecutive recruitment of eligible patients were been carried out. The data collection tools were been based on the WHO STEPwise survey questionnaire. Data collection was been carried out in accordance with ethical rules. <strong>Results:</strong> The study involved 615 patients. The proportions of sedentary lifestyle, low daily consumption of fruits/vegetables, overweight and obesity were 72.4%, 96.4%, 22.7% and 17.3% respectively. This was 55.5% of women who had a waist circumference that corresponded to a high risk of a cardiovascular event and 10.2% for men. 38.9% of patients had blood pressure above 140/90mmhg and 32.2% said they had never controlled their blood pressure in their life. The use of a consultation in a health structure to control his blood pressure was by far the most frequent modality with 61.4%. The proportion of people with cardiovascular disease was 50.1%. Hypertensive flare-ups/hypertensive emergencies were the leading complications diagnosed with 33.33%. Factors associated with the occurrence of cardiovascular disease were sex, age, professional status and body mass index. <strong>Discussion & Conclusion:</strong> The risk factors for cardiovascular disease are highly represented in our emergency units. In addition to the available care offer, the identification of factors associated with the occurrence of cardiovascular diseases in patients who are been seen there will allow targeted preventive actions within this fragile and vulnerable population. All this to help achieve target 3.4 of the Sustainable Development Goals (SDGs) by 2030. Furthermore, according to the associated factors identified, it appears that achieving SDG 8 will greatly contribute to the prevention of cardiovascular disease. This proves the urgency and interest of an integrated multi-ministerial vision in our strategic plans for the prevention against major non-communicable diseases and cardiovascular diseases in particular.展开更多
Objective To describe the preoperative factors of prolonged intensive care unit length of stay after coronary artery bypass grafting. Methods From 1997 to 2009, 1318 patients underwent isolated CABG in our hospital. R...Objective To describe the preoperative factors of prolonged intensive care unit length of stay after coronary artery bypass grafting. Methods From 1997 to 2009, 1318 patients underwent isolated CABG in our hospital. Retrospective analysis was performed on these cases. Univariate and multivariate analyses展开更多
目的构建全麻腹腔镜胆囊切除术(laparoscopic cholecystectomy,LC)患者麻醉恢复室(postanesthesia care unit,PACU)滞留预测模型,为PACU管理提供参考。方法选取2023年1月至2024年11月在绵竹市人民医院行全麻LC的患者为研究对象,收集患...目的构建全麻腹腔镜胆囊切除术(laparoscopic cholecystectomy,LC)患者麻醉恢复室(postanesthesia care unit,PACU)滞留预测模型,为PACU管理提供参考。方法选取2023年1月至2024年11月在绵竹市人民医院行全麻LC的患者为研究对象,收集患者术前、术中和PACU期间临床资料,根据PACU停留时间是否超过1 h分为PACU滞留组和非滞留组。通过Lasso回归筛选变量后使用Logistic回归构建预测模型并绘制列线图。采用Bootstrap法重抽样1000次进行内部验证。采用受试者工作特征曲线及其曲线下面积(AUC)、Hosmer-Lemeshow拟合优度检验、校准曲线、临床决策曲线、临床影响曲线分别评价预测模型的区分度、校准度、临床适用性和有效性。结果共纳入600例LC患者,104例发生PACU滞留。Lasso回归和Logistic回归分析显示,钾离子(K+)浓度、气管拔管时间、苏醒期躁动、PACU期间恶心呕吐是PACU发生滞留的影响因素。预测模型的AUC为0.803[95%CI(0.755,0.850)],Hosmer-Lemeshow拟合优度检验结果显示模型与理想模型差异无统计学意义(χ^(2)=1.660,P=0.572),基于Bootstrap重抽样1000次的结果显示,AUC为0.803[95%CI(0.756,0.853)];校准曲线显示预测概率与实际发生概率基本拟合;临床决策曲线显示,预测概率的阈值在0.00~0.68范围时,根据模型的预测概率进行干预的临床净收益高于对所有人不进行干预和对所有人进行干预;临床影响曲线显示,当预测概率的阈值大于0.30后,每1000人中模型预测的PACU滞留人数和实际发生的PACU滞留人数出现重叠匹配。结论K+浓度、气管拔管时间、苏醒期躁动、PACU期间恶心呕吐是LC患者PACU发生滞留的影响因素,基于这些因素构建的预测模型区分度、校准度、临床适用性和有效性较好,可为LC术后PACU滞留高风险患者的识别提供参考。展开更多
Objective The rate of post-operative complications has been increased with the changes in patients’age,prolonged duration,more severe and diffused lesions,and more patients with complications in recent years. We try ...Objective The rate of post-operative complications has been increased with the changes in patients’age,prolonged duration,more severe and diffused lesions,and more patients with complications in recent years. We try to identify the risk factors associated with prolonged stay in the intensive care unit (ICU) after coronary artery bypass graft surgery (CABG) . Methods 1623 patients who received CABG surgery in Beijing Anzhen Hospital展开更多
针对微电网多储能单元因荷电状态、额定容量和线路阻抗差异导致部分储能单元过充过放,影响其使用寿命进而使微网稳定性调节能力变差的问题,提出一种基于变调节因子的多储能荷电状态(state of charge,SoC)均衡策略,通过反余切函数将下垂...针对微电网多储能单元因荷电状态、额定容量和线路阻抗差异导致部分储能单元过充过放,影响其使用寿命进而使微网稳定性调节能力变差的问题,提出一种基于变调节因子的多储能荷电状态(state of charge,SoC)均衡策略,通过反余切函数将下垂系数与SoC、额定容量关联,并引入虚拟压降补偿环节,实现多组储能单元间SoC均衡。在此基础上设计变调节因子,提高SoC均衡速度。仿真结果验证了所提策略能实现多组储能单元间SoC均衡,有效提升SoC均衡速度,并消除线路阻抗对SoC均衡及电流分配精度的影响。展开更多
文摘To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the rectifier circuit is introduced and the double closed-loop control strategy in three-phase stationary coordinate system is analyzed. For the deficiency of control strategy, the control strategy in two-phase synchronous rotating coordinate system is proposed. This makes the independent control of active current and reactive current to be realized. The simulation model of the PWM rectifier is built and the effectiveness of the control method proposed in this paper is verified by simulation.
文摘With beta-lactam drugs and immunosuppressants widely used, the infection caused by Acinetobacter baumannfi （Ab） has become more and more serious with multidrug resistant Acinetobacter baumannfi （MDRAb） emerging and worsening rapidly. Compared with other patients, the incidence and multidrug resistance of MDRAb are higher in children in pediatric intensive care unit （PICU） because of immune deficiency, severe basic diseases, prolonged hospitalization and invasive operations. Hence it is significant to study the epidemiology and changes of antibacterial susceptibility in order to reduce the incidence of MDRAb in children. A total 115 patients with MDRAb pneumonia and 45 patients with negative MDRAb （NMDRAb） pneumonia who had been treated from January 2009 to August 2011 were studied retrospectively at the PICU of Wuhan Children＇s Hospital. Clinical data were analyzed with univariate and multivariate Logistic regression. In 176 clinical strains of Acinetobacter baumannfi isolated, there were 128 strains of MDRAb, accounting for 72.73%. Drug susceptibility tests showed that the resistance rates of 13-1actam antibiotics were more than 70% except for cefoperazone sulbactam. The rates to carbapenems were higher than 90%. They were significantly higher than those of NMDRAb. Amikacin, levofloxacin, ciprofloxacin and minocycline had the lowest drug-resistance rates （〈20%）. Multivariate Logistic regression revealed that ICU stay, the time of mechanical ventilation, anemia, hypoproteinemia and the use of carbapenems were independent risk factors for MDRAb pneumonia. MDRAb is an important opportunistic pathogen to pneumonia in PICU, and its drug-resistance is severe. It increases significantly the mortality of patients. It is important to take the effective prevention measures for controlling it.
文摘Background and Aim: The absence of data in our context motivates this study aiming to determine the frequency of AHF at the ICU, assess the in-hospital evolution of the disease and to find out poor prognosis.Material and Methods: It was an observational and descriptive study covering the time from January 1, 2014 to March 30, 2017 involving all inpatient records in ICU. From January 2014 to December 2017, collected data included those on socio-demographic, history of diseases and physical examination, and some labor dataincluding Pro BNP, serum creatinine, blood ionogram,?cardiac enzymes and blood count. Also data electrocardiography, echocardiography and in-hospital evolution were collected. Statistical Analysis:Statistical analysis was performed using SPSS (IBM Inc) version 18. Results: AHF occured in 47.36% with a mean age of 58.74 ± 18.407 and extremes of 17 and 90 years, women representing 53.1% (sex ratio Male:Female = 0.88). Hypertension and diabetes were the predominant cardiovascular risk factors with respectively 67.4% and 18.4%. At admission?44%, 37.7% and 17.9% of patients were respectively hypertensive,?normotensive and hypotensive. The clinical expression was mainly global heart failure with 42.6% followed by left heart failure and right heart failure with respectively 37% and 20.4%. The coronary syndromes (all forms) was the first cause of ICA with 34% of cases followed by pulmonary embolism and hypertension with respectively 25.3% and 24.1%. Mean hospital stay was 5.61 ± 3.527 days (1 to 25 days). Complications were recorded in 18.5% of patients with cardiogenic shock in half of all cases. In multi-variate analysis, only hypotension at admission was shown to be the independent factor of poor prognosis with p = 0.016 and OR = 4.453 (1.322 - 14.996). Conclusion: As a common manifestation heart failure can be rapidly fatal in presence of collapsus or hypotension at admission. These factors should be accurately managed to reduce mortality, which remains high in our context.
文摘<strong>Introduction:</strong> Cardiovascular diseases constitute the deadliest pathology in the world with 31% of global mortality in 2018. This is how we felt it necessary to conduct a study on cardiovascular diseases in emergency units of Senegal, more precisely in Dakar, in order to know epidemiological profile of these patients. <strong>Methods:</strong> The study setting was the reception and emergency units of the Hôpital de Pikine and Hôpital Principal de Dakar. This was an observational, descriptive cross-sectional study with an analytical aim to search for factors associated with the occurrence of cardiovascular disease. The study ran from January 25th to February 5th, 2018 at the Hôpital de Pikine and from February 25th to March 5th, 2018 at Hôpital Principal de Dakar. The source population consisted of patients over 18 years of age and not in a state of pregnancy, who were been received there and had given their free and informed consent to participate in the survey. A representative sample had drawn and a consecutive recruitment of eligible patients were been carried out. The data collection tools were been based on the WHO STEPwise survey questionnaire. Data collection was been carried out in accordance with ethical rules. <strong>Results:</strong> The study involved 615 patients. The proportions of sedentary lifestyle, low daily consumption of fruits/vegetables, overweight and obesity were 72.4%, 96.4%, 22.7% and 17.3% respectively. This was 55.5% of women who had a waist circumference that corresponded to a high risk of a cardiovascular event and 10.2% for men. 38.9% of patients had blood pressure above 140/90mmhg and 32.2% said they had never controlled their blood pressure in their life. The use of a consultation in a health structure to control his blood pressure was by far the most frequent modality with 61.4%. The proportion of people with cardiovascular disease was 50.1%. Hypertensive flare-ups/hypertensive emergencies were the leading complications diagnosed with 33.33%. Factors associated with the occurrence of cardiovascular disease were sex, age, professional status and body mass index. <strong>Discussion & Conclusion:</strong> The risk factors for cardiovascular disease are highly represented in our emergency units. In addition to the available care offer, the identification of factors associated with the occurrence of cardiovascular diseases in patients who are been seen there will allow targeted preventive actions within this fragile and vulnerable population. All this to help achieve target 3.4 of the Sustainable Development Goals (SDGs) by 2030. Furthermore, according to the associated factors identified, it appears that achieving SDG 8 will greatly contribute to the prevention of cardiovascular disease. This proves the urgency and interest of an integrated multi-ministerial vision in our strategic plans for the prevention against major non-communicable diseases and cardiovascular diseases in particular.
文摘Objective To describe the preoperative factors of prolonged intensive care unit length of stay after coronary artery bypass grafting. Methods From 1997 to 2009, 1318 patients underwent isolated CABG in our hospital. Retrospective analysis was performed on these cases. Univariate and multivariate analyses
文摘目的构建全麻腹腔镜胆囊切除术(laparoscopic cholecystectomy,LC)患者麻醉恢复室(postanesthesia care unit,PACU)滞留预测模型,为PACU管理提供参考。方法选取2023年1月至2024年11月在绵竹市人民医院行全麻LC的患者为研究对象,收集患者术前、术中和PACU期间临床资料,根据PACU停留时间是否超过1 h分为PACU滞留组和非滞留组。通过Lasso回归筛选变量后使用Logistic回归构建预测模型并绘制列线图。采用Bootstrap法重抽样1000次进行内部验证。采用受试者工作特征曲线及其曲线下面积(AUC)、Hosmer-Lemeshow拟合优度检验、校准曲线、临床决策曲线、临床影响曲线分别评价预测模型的区分度、校准度、临床适用性和有效性。结果共纳入600例LC患者,104例发生PACU滞留。Lasso回归和Logistic回归分析显示,钾离子(K+)浓度、气管拔管时间、苏醒期躁动、PACU期间恶心呕吐是PACU发生滞留的影响因素。预测模型的AUC为0.803[95%CI(0.755,0.850)],Hosmer-Lemeshow拟合优度检验结果显示模型与理想模型差异无统计学意义(χ^(2)=1.660,P=0.572),基于Bootstrap重抽样1000次的结果显示,AUC为0.803[95%CI(0.756,0.853)];校准曲线显示预测概率与实际发生概率基本拟合;临床决策曲线显示,预测概率的阈值在0.00~0.68范围时,根据模型的预测概率进行干预的临床净收益高于对所有人不进行干预和对所有人进行干预;临床影响曲线显示,当预测概率的阈值大于0.30后,每1000人中模型预测的PACU滞留人数和实际发生的PACU滞留人数出现重叠匹配。结论K+浓度、气管拔管时间、苏醒期躁动、PACU期间恶心呕吐是LC患者PACU发生滞留的影响因素,基于这些因素构建的预测模型区分度、校准度、临床适用性和有效性较好,可为LC术后PACU滞留高风险患者的识别提供参考。
文摘Objective The rate of post-operative complications has been increased with the changes in patients’age,prolonged duration,more severe and diffused lesions,and more patients with complications in recent years. We try to identify the risk factors associated with prolonged stay in the intensive care unit (ICU) after coronary artery bypass graft surgery (CABG) . Methods 1623 patients who received CABG surgery in Beijing Anzhen Hospital
文摘针对微电网多储能单元因荷电状态、额定容量和线路阻抗差异导致部分储能单元过充过放,影响其使用寿命进而使微网稳定性调节能力变差的问题,提出一种基于变调节因子的多储能荷电状态(state of charge,SoC)均衡策略,通过反余切函数将下垂系数与SoC、额定容量关联,并引入虚拟压降补偿环节,实现多组储能单元间SoC均衡。在此基础上设计变调节因子,提高SoC均衡速度。仿真结果验证了所提策略能实现多组储能单元间SoC均衡,有效提升SoC均衡速度,并消除线路阻抗对SoC均衡及电流分配精度的影响。
