Mustafa Saad - Academia.edu (original) (raw)
Papers by Mustafa Saad
Universal Journal of Control and Automation
Ball and beam system is found in most laboratories of control systems engineering due to its simp... more Ball and beam system is found in most laboratories of control systems engineering due to its simplicity and easiness in construction and control theoretically. The system consists of a motor attached with a beam at the center and a ball, which is placed on the top of beam. The problem with this system, is in the time of an electrical control signal is applied to the motor, the beam can be tilted about its horizontal axis and the ball will roll on the top of the beam. Therefore, if the system cannot be controlled properly, the ball may fall down from the beam. In this paper, PID controller Algorithm based on Arduino microcontroller which depends on the feedback signal is used to control the ball position using linear potentiometer position sensor. MATLAB software program has been used to plot the system response by observing the ball position for a predefined amount of time. The controller parameters have been tuned using trial and error method, tested for different set point tracking and for disturbance rejection in order to obtain a good system characteristic.
Automatic controls play an ever-increasing role in a human way of life. Automatic control is vast... more Automatic controls play an ever-increasing role in a human way of life. Automatic control is vast technological area whose central aim is to develop control strategies that improve performance when they applied to a system. the distinct characteristic of automatic control is that it reduces the human operator. One such gadget is the fan. The fans are generally available with speed control, depending on the requirement the speed is set. Usually, when the temperature is high the fan set at high speed and at lower temperatures the fan is operated with lower speed. This is done manually using human. In this paper, an automatic control solution is suggested to control the fan speed. A circuit with LM35DZ temperature sensor, PIC16F877A microcontroller, brush less DC motor and few of electronic components is designed and implemented to control the fan speed automatically. As an additional feature LCD is used to present the temperature and the fan speed. Finally, the designed system circuit is tested in many times and performed very well.
Directory and Report of City ProgressZigbee Based Multilevel Parking Vacancy Monitoring SystemEur... more Directory and Report of City ProgressZigbee Based Multilevel Parking Vacancy Monitoring SystemEuropean Technical DigestsEmerging Technologies in Data Mining and Information SecurityPublic Works Weekly SurveyorThe Journal of Gas Lighting, Water Supply & Sanitary ImprovementThe Municipal Journal, Public Works Engineer and Contractors' GuideFactoryProceedings of Second International Conference on Smart Energy and Communication2019 International Conference on Intelligent Computing and Control Systems (ICCS).Lineman's and Cableman's Handbook 12th EditionProceedings of International Conference on Communication and NetworksDirectory and Report of City ActivitiesLED LightingHearingsModeling and Simulation of Automatic Street Light ControllerSmart Homes and Their UsersIndustrial Electronics and Control2018 International Conference on Information, Communication, Engineering and Technology (ICICET)Security and Privacy Applications for Smart City DevelopmentTraffic EngineeringFeedba...
2015 IEEE Industry Applications Society Annual Meeting, 2015
Journal of Automation and Control Engineering, 2014
Liquid level control is mostly used in most of the industries where liquid level and flow control... more Liquid level control is mostly used in most of the industries where liquid level and flow control are essential. This paper introduces the approach of modeling and control of liquid level control system for a Coupled-Tank System. First, this paper shows mathematical equations for the nonlinear system. Then it presents the linearized model for the proposed system. Two controllers of the system based on the conventional Proportional plus Integral (PI) controller and Model Reference Adaptive Control (MRAC) technique are used, to control the level of the second tank for the linearized model, through variable manipulation of water pump in the first tank. Finally, the simulation study is done, which demonstrates that the MRAC controller produces better response compared to the PI controller.
Direct current (DC) motors are the most used motors in control engineering applications due to th... more Direct current (DC) motors are the most used motors in control engineering applications due to their simplicity of construction, easy to control, and excellent performance. These motors should be well controlled to perform the required task. This research focuses on DC motor functional application in terms of a position control system using LabVIEW. This control system is a closed-loop real-time control system whereas incremental encoder 298 is coupled to the motor shaft to provide the feedback position signal to a controller; Proportional Integral Derivative (PID) The PID controls the position of the DC motor at the desired position with a minimum error. The PID controller was implemented in LabVIEW software which sends the control signal to the real-time DC motor through the Arduino board. In addition, LabVIEW software was developed to show the output response of motor position versus time to easily observe the performance of the system. The PID controller gains were obtained base...
Universal Journal of Control and Automation, 2017
In the process industry many of the control applications deal with liquid level, flow, temperatur... more In the process industry many of the control applications deal with liquid level, flow, temperature and pressure processes. This paper presents the approach of modeling and controller design of liquid level control system for a nonlinear Coupled-Tank System. First of all, the mathematical equations for the nonlinear system are explored. And then, proportional plus integral (PI) controller is designed to control the level of the second tank for the nonlinear model, through variable manipulation of water pump in the first tank. The simulation study is done using MATLAB and the performance analysis in time domain of the controller is identified. In addition, ITAE criterion is used to evaluate the controller performance. Finally, the simulation results indicate that the controller work very well and the proposed controller has the ability to reject the effect of the disturbance.
Most of the industrial processes are multivariable in nature. The multivariable system consists o... more Most of the industrial processes are multivariable in nature. The multivariable system consists of many manipulated and controlled variables and thereby it is very difficult in controller design because of changes in process dynamics and interactions between process variables. A quantitative approach such as relative gain array is used in the analysis of the interactions between manipulated and controlled variables, and thus provides a best pairing to generate a control scheme. In this paper, the coupled tank control system has two inputs, which are the inlet flow rate to the tanks and two outputs, which are the liquid level height inside the tanks. PID controller has been commonly used in industrial automation. PID controllers are designed and simulated for the best loop pairings of manipulated and controlled variables. In this work, a MIMO system is converted to multivariable SISO system in the separation process for the coupled tank. In the consideration of nonlinearity, the fuzz...
Sliding mode control is a powerful approach for controlling nonlinear and uncertain systems. This... more Sliding mode control is a powerful approach for controlling nonlinear and uncertain systems. This paper presents the liquid level control of the nonlinear-coupled tank system using sliding mode control technique. At first, a static sliding mode control technique is proposed to control level height of the second tank. According to the chattering problem that happened with static sliding mode control, integral sliding mode controller is suggested to reduce the chattering problem, as well as guarantee the asymptotic stability of the feedback system. The closed loop system is simulated using MATLAB Simulink to demonstrate the characteristic performance of the developed control approaches. Therefore, the simulation results indicate that the proposed control schemes work very well. While, the integral sliding mode control has a better performance for the rejection of disturbance, as well as the system’s parameters variation.
Journal of the Islamic Medical Association of North America, Apr 2, 2001
International Journal of Infectious Diseases, 2014
Background: Bacterial resistance to antibiotics is a major public health problem. In Africa, few ... more Background: Bacterial resistance to antibiotics is a major public health problem. In Africa, few data are available however in this field. Thus, at the Hopital Principal of Dakar, a data collecting system and monthly resistance analyses has been implemented by the Committee against nosocomial infections (CLIN). We present here the results compiled over a year to help guide prevention activities.
Mediterranean journal of hematology and infectious diseases, 2015
Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogene... more Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogeneic stem cell transplantation (SCT). Only a few studies have addressed CMV reactivation after autologous SCT (ASCT). We retrospectively reviewed medical records of 210 adult patients who underwent ASCT for lymphoma or multiple myeloma (MM) at a single center from January 1(st), 2007 until December 31(st), 2012. All patients were monitored weekly with CMV antigenemia test till day 42 after transplantation, and for 2 months after last positive test in those who had any positive CMV antigenemia test before day 42. Thirty-seven (17.6%) patients had CMV reactivation; 23 patients had lymphoma while 14 had MM as the underlying disease. There was no difference in the rate of CMV reactivation between lymphoma and MM patients (20% versus 14.7%, P = 0.32). The majority of the patients were treated with ganciclovir/valganciclovir, all patients had their reactivation resolved with therapy, and none de...
Mediterranean Journal of Hematology and Infectious Diseases, 2014
Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogene... more Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogeneic stem cell transplantation (SCT). Only a few studies have addressed CMV reactivation after autologous SCT (ASCT). We retrospectively reviewed medical records of 210 adult patients who underwent ASCT for lymphoma or multiple myeloma (MM) at a single center from January 1(st), 2007 until December 31(st), 2012. All patients were monitored weekly with CMV antigenemia test till day 42 after transplantation, and for 2 months after last positive test in those who had any positive CMV antigenemia test before day 42. Thirty-seven (17.6%) patients had CMV reactivation; 23 patients had lymphoma while 14 had MM as the underlying disease. There was no difference in the rate of CMV reactivation between lymphoma and MM patients (20% versus 14.7%, P = 0.32). The majority of the patients were treated with ganciclovir/valganciclovir, all patients had their reactivation resolved with therapy, and none developed symptomatic CMV infection. None of the patients who died within 100 days of transplantation had CMV reactivation. Log-rank test showed that CMV reactivation had no effect on the overall survival of patients (P values, 0.29). In our cohort, CMV reactivation rate after ASCT was 17.6%. There was no difference in reactivation rates between lymphoma and MM patients. With the use of preemptive therapy, symptomatic CMV infection was not documented in any patient in our cohort. CMV reactivation had no impact on patients' survival post ASCT.
Background: Methicillin-resistant S. aureus (MRSA) is a widespread nosocomial infection problem. ... more Background: Methicillin-resistant S. aureus (MRSA) is a widespread nosocomial infection problem. Consequently, hospitalized patients have been treated with mupirocin ointment to eliminate nasal carriage of MRSA. Following frequent usage for decolonization in the 1990s, mupirocin resistance was relatively high (32%) at a Veterans Affairs Medical Center (VAMC). By 2001, resistance declined to 4% in concert with prescription control. The goals of this study were to determine if mupirocin resistance remained low, to examine resistance in a facility with a different patient population and mupirocin usage history, and to assess the incidence of mupirocin resistance in coagulase-negative staphylococci. Methods: A point-prevalence survey of staphylococci isolated from the nares of 50 VAMC patients in 2003 showed the incidence of mupirocin resistance in S. aureus was rare (3%) but resistance was relatively high (39%) in S. epidermidis. At the nearby community hospital (CH), mupirocin was use...
Saudi Medical Journal, 2015
ً حديثا Mycobacterium riyadhense رياضنز املتفطرة صنفت هذا في النمو. بطيئة ة ّ ... more ً حديثا Mycobacterium riyadhense رياضنز املتفطرة صنفت هذا في النمو. بطيئة ة ّ السلي غير املتفطرات أنواع ضمن من ناجتةٍ رئويةٍ غير إلصابةٍ تعرضتا مريضتني حالتي نصف التقرير احلاالت جميع ونستعرض كما رياضنز. باملتفطرة العدوى عن و املرض لطيف وصف مع الطبية، املجالت في ً سابقا املنشورة الراهنتني احلالتني في خبرتنا إلى ً استنادا املتوفرة العالج خليارات السابقة.
Medical science monitor : international medical journal of experimental and clinical research, 2003
Prior reports have suggested that low educational attainment could be associated with higher inci... more Prior reports have suggested that low educational attainment could be associated with higher incidence of some of the cardiovascular conditions. We evaluated the association of educational attainment (> or =12 years or <12 years) with the incidence of fatal strokes, ischemic stroke, intracerebral hemorrhage, and myocardial infarction in a cohort of 21,443 United States adults who participated in either the First National Health and Nutrition Examination Survey (NHANES-I) Epidemiologic Follow-up Study (NHEFS) or the Second National Health and Nutrition Examination Survey Mortality Follow-up Study (NHANES-II). Cox proportional hazards analyses were used to examine the relationships. During a mean follow-up period of 15.2+/-4.6 years, the risk for all fatal strokes was increased in persons who reported less than 12 years of education. The increased risk was more prominent in persons aged 50 years or less (relative risk [RR], 2.6; 95% confidence interval [CI], 1.1-6.0) compared wi...
International Journal of Infectious Diseases, 2014
The Lancet Infectious Diseases, 2014
Stroke, 2002
Background-We report the occurrence of fatal intracerebral hemorrhage associated with using a com... more Background-We report the occurrence of fatal intracerebral hemorrhage associated with using a combination of antithrombotic agents, including abciximab, in patients undergoing neurointerventional procedures. Summary of Report-Seven patients (average age 60, range 46 to 73 years) developed fatal intracerebral hemorrhages associated with neurointerventional procedures and the use of intravenous abciximab. The procedures included angioplasty and stent placement in the cervical internal carotid artery (nϭ4), angioplasty of the intracranial internal carotid artery (nϭ1), and angioplasty of the middle cerebral artery (nϭ2). Clinical deterioration was observed within 1 hour of the procedure in 5 patients and 7 and 8 hours after the procedure, respectively, in the remaining 2 patients. All patients had received heparin and clopidogrel; 6 had also received aspirin. Conclusions-Intracerebral hemorrhages can occur after neurointerventional procedures in patients with recent cerebral ischemic events, particularly when aggressive antithrombotic treatment is used.
Neurosurgery, 2002
Abnormal serum sodium levels (hyponatremia and hypernatremia) are frequently observed during the ... more Abnormal serum sodium levels (hyponatremia and hypernatremia) are frequently observed during the acute period after aneurysmal subarachnoid hemorrhage (SAH) and may worsen cerebral edema and mass effect. We performed this study to determine the prognostic significance of serum sodium concentration abnormalities. We analyzed prospectively collected data for the placebo treatment group in a clinical trial conducted at 54 neurosurgical centers in North America. The presence of hypernatremia (serum sodium concentration of &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;145 mmol/L) and hyponatremia (serum sodium concentration of &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;135 mmol/L) was determined with serum sodium measurements obtained at admission and 3, 6, and 9 days after SAH. The effects of hypernatremia and hyponatremia on the risk of symptomatic vasospasm and on 3-month outcomes were analyzed after adjustment for the following potential confounding factors: age, sex, preexisting hypertension, admission Glasgow Coma Scale score, initial mean arterial pressure, subarachnoid clot thickness, intraventricular blood or intraparenchymal hematoma, ventricular dilation, and aneurysm size and location. Of 298 patients in the analysis, 58 (19%) developed hypernatremia and 88 (30%) developed hyponatremia. Hypernatremia was significantly associated with poor outcomes (odds ratio, 2.7; 95% confidence interval, 1.2-6.1). A positive correlation was observed between the highest sodium values recorded and Glasgow Outcome Scale scores at 3 months (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.0001 by analysis of variance). Hyponatremia was not associated with 3-month outcomes (odds ratio, 1.9; 95% confidence interval, 0.9-4.3). Neither hypernatremia nor hyponatremia was associated with the risk of symptomatic vasospasm. Hyponatremia seems to be more common than hypernatremia after SAH. However, hypernatremia after SAH is independently associated with poor outcomes, and this association is independent of previously identified outcome predictors, including age and admission Glasgow Coma Scale scores. Further studies are needed to define the underlying mechanism of this association.
Universal Journal of Control and Automation
Ball and beam system is found in most laboratories of control systems engineering due to its simp... more Ball and beam system is found in most laboratories of control systems engineering due to its simplicity and easiness in construction and control theoretically. The system consists of a motor attached with a beam at the center and a ball, which is placed on the top of beam. The problem with this system, is in the time of an electrical control signal is applied to the motor, the beam can be tilted about its horizontal axis and the ball will roll on the top of the beam. Therefore, if the system cannot be controlled properly, the ball may fall down from the beam. In this paper, PID controller Algorithm based on Arduino microcontroller which depends on the feedback signal is used to control the ball position using linear potentiometer position sensor. MATLAB software program has been used to plot the system response by observing the ball position for a predefined amount of time. The controller parameters have been tuned using trial and error method, tested for different set point tracking and for disturbance rejection in order to obtain a good system characteristic.
Automatic controls play an ever-increasing role in a human way of life. Automatic control is vast... more Automatic controls play an ever-increasing role in a human way of life. Automatic control is vast technological area whose central aim is to develop control strategies that improve performance when they applied to a system. the distinct characteristic of automatic control is that it reduces the human operator. One such gadget is the fan. The fans are generally available with speed control, depending on the requirement the speed is set. Usually, when the temperature is high the fan set at high speed and at lower temperatures the fan is operated with lower speed. This is done manually using human. In this paper, an automatic control solution is suggested to control the fan speed. A circuit with LM35DZ temperature sensor, PIC16F877A microcontroller, brush less DC motor and few of electronic components is designed and implemented to control the fan speed automatically. As an additional feature LCD is used to present the temperature and the fan speed. Finally, the designed system circuit is tested in many times and performed very well.
Directory and Report of City ProgressZigbee Based Multilevel Parking Vacancy Monitoring SystemEur... more Directory and Report of City ProgressZigbee Based Multilevel Parking Vacancy Monitoring SystemEuropean Technical DigestsEmerging Technologies in Data Mining and Information SecurityPublic Works Weekly SurveyorThe Journal of Gas Lighting, Water Supply & Sanitary ImprovementThe Municipal Journal, Public Works Engineer and Contractors' GuideFactoryProceedings of Second International Conference on Smart Energy and Communication2019 International Conference on Intelligent Computing and Control Systems (ICCS).Lineman's and Cableman's Handbook 12th EditionProceedings of International Conference on Communication and NetworksDirectory and Report of City ActivitiesLED LightingHearingsModeling and Simulation of Automatic Street Light ControllerSmart Homes and Their UsersIndustrial Electronics and Control2018 International Conference on Information, Communication, Engineering and Technology (ICICET)Security and Privacy Applications for Smart City DevelopmentTraffic EngineeringFeedba...
2015 IEEE Industry Applications Society Annual Meeting, 2015
Journal of Automation and Control Engineering, 2014
Liquid level control is mostly used in most of the industries where liquid level and flow control... more Liquid level control is mostly used in most of the industries where liquid level and flow control are essential. This paper introduces the approach of modeling and control of liquid level control system for a Coupled-Tank System. First, this paper shows mathematical equations for the nonlinear system. Then it presents the linearized model for the proposed system. Two controllers of the system based on the conventional Proportional plus Integral (PI) controller and Model Reference Adaptive Control (MRAC) technique are used, to control the level of the second tank for the linearized model, through variable manipulation of water pump in the first tank. Finally, the simulation study is done, which demonstrates that the MRAC controller produces better response compared to the PI controller.
Direct current (DC) motors are the most used motors in control engineering applications due to th... more Direct current (DC) motors are the most used motors in control engineering applications due to their simplicity of construction, easy to control, and excellent performance. These motors should be well controlled to perform the required task. This research focuses on DC motor functional application in terms of a position control system using LabVIEW. This control system is a closed-loop real-time control system whereas incremental encoder 298 is coupled to the motor shaft to provide the feedback position signal to a controller; Proportional Integral Derivative (PID) The PID controls the position of the DC motor at the desired position with a minimum error. The PID controller was implemented in LabVIEW software which sends the control signal to the real-time DC motor through the Arduino board. In addition, LabVIEW software was developed to show the output response of motor position versus time to easily observe the performance of the system. The PID controller gains were obtained base...
Universal Journal of Control and Automation, 2017
In the process industry many of the control applications deal with liquid level, flow, temperatur... more In the process industry many of the control applications deal with liquid level, flow, temperature and pressure processes. This paper presents the approach of modeling and controller design of liquid level control system for a nonlinear Coupled-Tank System. First of all, the mathematical equations for the nonlinear system are explored. And then, proportional plus integral (PI) controller is designed to control the level of the second tank for the nonlinear model, through variable manipulation of water pump in the first tank. The simulation study is done using MATLAB and the performance analysis in time domain of the controller is identified. In addition, ITAE criterion is used to evaluate the controller performance. Finally, the simulation results indicate that the controller work very well and the proposed controller has the ability to reject the effect of the disturbance.
Most of the industrial processes are multivariable in nature. The multivariable system consists o... more Most of the industrial processes are multivariable in nature. The multivariable system consists of many manipulated and controlled variables and thereby it is very difficult in controller design because of changes in process dynamics and interactions between process variables. A quantitative approach such as relative gain array is used in the analysis of the interactions between manipulated and controlled variables, and thus provides a best pairing to generate a control scheme. In this paper, the coupled tank control system has two inputs, which are the inlet flow rate to the tanks and two outputs, which are the liquid level height inside the tanks. PID controller has been commonly used in industrial automation. PID controllers are designed and simulated for the best loop pairings of manipulated and controlled variables. In this work, a MIMO system is converted to multivariable SISO system in the separation process for the coupled tank. In the consideration of nonlinearity, the fuzz...
Sliding mode control is a powerful approach for controlling nonlinear and uncertain systems. This... more Sliding mode control is a powerful approach for controlling nonlinear and uncertain systems. This paper presents the liquid level control of the nonlinear-coupled tank system using sliding mode control technique. At first, a static sliding mode control technique is proposed to control level height of the second tank. According to the chattering problem that happened with static sliding mode control, integral sliding mode controller is suggested to reduce the chattering problem, as well as guarantee the asymptotic stability of the feedback system. The closed loop system is simulated using MATLAB Simulink to demonstrate the characteristic performance of the developed control approaches. Therefore, the simulation results indicate that the proposed control schemes work very well. While, the integral sliding mode control has a better performance for the rejection of disturbance, as well as the system’s parameters variation.
Journal of the Islamic Medical Association of North America, Apr 2, 2001
International Journal of Infectious Diseases, 2014
Background: Bacterial resistance to antibiotics is a major public health problem. In Africa, few ... more Background: Bacterial resistance to antibiotics is a major public health problem. In Africa, few data are available however in this field. Thus, at the Hopital Principal of Dakar, a data collecting system and monthly resistance analyses has been implemented by the Committee against nosocomial infections (CLIN). We present here the results compiled over a year to help guide prevention activities.
Mediterranean journal of hematology and infectious diseases, 2015
Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogene... more Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogeneic stem cell transplantation (SCT). Only a few studies have addressed CMV reactivation after autologous SCT (ASCT). We retrospectively reviewed medical records of 210 adult patients who underwent ASCT for lymphoma or multiple myeloma (MM) at a single center from January 1(st), 2007 until December 31(st), 2012. All patients were monitored weekly with CMV antigenemia test till day 42 after transplantation, and for 2 months after last positive test in those who had any positive CMV antigenemia test before day 42. Thirty-seven (17.6%) patients had CMV reactivation; 23 patients had lymphoma while 14 had MM as the underlying disease. There was no difference in the rate of CMV reactivation between lymphoma and MM patients (20% versus 14.7%, P = 0.32). The majority of the patients were treated with ganciclovir/valganciclovir, all patients had their reactivation resolved with therapy, and none de...
Mediterranean Journal of Hematology and Infectious Diseases, 2014
Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogene... more Cytomegalovirus (CMV) reactivation and infection are well-recognized complications after allogeneic stem cell transplantation (SCT). Only a few studies have addressed CMV reactivation after autologous SCT (ASCT). We retrospectively reviewed medical records of 210 adult patients who underwent ASCT for lymphoma or multiple myeloma (MM) at a single center from January 1(st), 2007 until December 31(st), 2012. All patients were monitored weekly with CMV antigenemia test till day 42 after transplantation, and for 2 months after last positive test in those who had any positive CMV antigenemia test before day 42. Thirty-seven (17.6%) patients had CMV reactivation; 23 patients had lymphoma while 14 had MM as the underlying disease. There was no difference in the rate of CMV reactivation between lymphoma and MM patients (20% versus 14.7%, P = 0.32). The majority of the patients were treated with ganciclovir/valganciclovir, all patients had their reactivation resolved with therapy, and none developed symptomatic CMV infection. None of the patients who died within 100 days of transplantation had CMV reactivation. Log-rank test showed that CMV reactivation had no effect on the overall survival of patients (P values, 0.29). In our cohort, CMV reactivation rate after ASCT was 17.6%. There was no difference in reactivation rates between lymphoma and MM patients. With the use of preemptive therapy, symptomatic CMV infection was not documented in any patient in our cohort. CMV reactivation had no impact on patients&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; survival post ASCT.
Background: Methicillin-resistant S. aureus (MRSA) is a widespread nosocomial infection problem. ... more Background: Methicillin-resistant S. aureus (MRSA) is a widespread nosocomial infection problem. Consequently, hospitalized patients have been treated with mupirocin ointment to eliminate nasal carriage of MRSA. Following frequent usage for decolonization in the 1990s, mupirocin resistance was relatively high (32%) at a Veterans Affairs Medical Center (VAMC). By 2001, resistance declined to 4% in concert with prescription control. The goals of this study were to determine if mupirocin resistance remained low, to examine resistance in a facility with a different patient population and mupirocin usage history, and to assess the incidence of mupirocin resistance in coagulase-negative staphylococci. Methods: A point-prevalence survey of staphylococci isolated from the nares of 50 VAMC patients in 2003 showed the incidence of mupirocin resistance in S. aureus was rare (3%) but resistance was relatively high (39%) in S. epidermidis. At the nearby community hospital (CH), mupirocin was use...
Saudi Medical Journal, 2015
ً حديثا Mycobacterium riyadhense رياضنز املتفطرة صنفت هذا في النمو. بطيئة ة ّ ... more ً حديثا Mycobacterium riyadhense رياضنز املتفطرة صنفت هذا في النمو. بطيئة ة ّ السلي غير املتفطرات أنواع ضمن من ناجتةٍ رئويةٍ غير إلصابةٍ تعرضتا مريضتني حالتي نصف التقرير احلاالت جميع ونستعرض كما رياضنز. باملتفطرة العدوى عن و املرض لطيف وصف مع الطبية، املجالت في ً سابقا املنشورة الراهنتني احلالتني في خبرتنا إلى ً استنادا املتوفرة العالج خليارات السابقة.
Medical science monitor : international medical journal of experimental and clinical research, 2003
Prior reports have suggested that low educational attainment could be associated with higher inci... more Prior reports have suggested that low educational attainment could be associated with higher incidence of some of the cardiovascular conditions. We evaluated the association of educational attainment (> or =12 years or <12 years) with the incidence of fatal strokes, ischemic stroke, intracerebral hemorrhage, and myocardial infarction in a cohort of 21,443 United States adults who participated in either the First National Health and Nutrition Examination Survey (NHANES-I) Epidemiologic Follow-up Study (NHEFS) or the Second National Health and Nutrition Examination Survey Mortality Follow-up Study (NHANES-II). Cox proportional hazards analyses were used to examine the relationships. During a mean follow-up period of 15.2+/-4.6 years, the risk for all fatal strokes was increased in persons who reported less than 12 years of education. The increased risk was more prominent in persons aged 50 years or less (relative risk [RR], 2.6; 95% confidence interval [CI], 1.1-6.0) compared wi...
International Journal of Infectious Diseases, 2014
The Lancet Infectious Diseases, 2014
Stroke, 2002
Background-We report the occurrence of fatal intracerebral hemorrhage associated with using a com... more Background-We report the occurrence of fatal intracerebral hemorrhage associated with using a combination of antithrombotic agents, including abciximab, in patients undergoing neurointerventional procedures. Summary of Report-Seven patients (average age 60, range 46 to 73 years) developed fatal intracerebral hemorrhages associated with neurointerventional procedures and the use of intravenous abciximab. The procedures included angioplasty and stent placement in the cervical internal carotid artery (nϭ4), angioplasty of the intracranial internal carotid artery (nϭ1), and angioplasty of the middle cerebral artery (nϭ2). Clinical deterioration was observed within 1 hour of the procedure in 5 patients and 7 and 8 hours after the procedure, respectively, in the remaining 2 patients. All patients had received heparin and clopidogrel; 6 had also received aspirin. Conclusions-Intracerebral hemorrhages can occur after neurointerventional procedures in patients with recent cerebral ischemic events, particularly when aggressive antithrombotic treatment is used.
Neurosurgery, 2002
Abnormal serum sodium levels (hyponatremia and hypernatremia) are frequently observed during the ... more Abnormal serum sodium levels (hyponatremia and hypernatremia) are frequently observed during the acute period after aneurysmal subarachnoid hemorrhage (SAH) and may worsen cerebral edema and mass effect. We performed this study to determine the prognostic significance of serum sodium concentration abnormalities. We analyzed prospectively collected data for the placebo treatment group in a clinical trial conducted at 54 neurosurgical centers in North America. The presence of hypernatremia (serum sodium concentration of &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;145 mmol/L) and hyponatremia (serum sodium concentration of &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;135 mmol/L) was determined with serum sodium measurements obtained at admission and 3, 6, and 9 days after SAH. The effects of hypernatremia and hyponatremia on the risk of symptomatic vasospasm and on 3-month outcomes were analyzed after adjustment for the following potential confounding factors: age, sex, preexisting hypertension, admission Glasgow Coma Scale score, initial mean arterial pressure, subarachnoid clot thickness, intraventricular blood or intraparenchymal hematoma, ventricular dilation, and aneurysm size and location. Of 298 patients in the analysis, 58 (19%) developed hypernatremia and 88 (30%) developed hyponatremia. Hypernatremia was significantly associated with poor outcomes (odds ratio, 2.7; 95% confidence interval, 1.2-6.1). A positive correlation was observed between the highest sodium values recorded and Glasgow Outcome Scale scores at 3 months (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.0001 by analysis of variance). Hyponatremia was not associated with 3-month outcomes (odds ratio, 1.9; 95% confidence interval, 0.9-4.3). Neither hypernatremia nor hyponatremia was associated with the risk of symptomatic vasospasm. Hyponatremia seems to be more common than hypernatremia after SAH. However, hypernatremia after SAH is independently associated with poor outcomes, and this association is independent of previously identified outcome predictors, including age and admission Glasgow Coma Scale scores. Further studies are needed to define the underlying mechanism of this association.