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Preoperative Serum Albumin Levels and Postoperative Acute Kidney Injury in Off-Pump Coronary Artery Bypass Surgery: A Single-Center Study in Bangladesh

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World Journal of Cardiovascular Surgery 2024年第8期14卷 131-144页

作者： Ahmad Pear Salahuddin md. Abir Tazim Chowdhury Munama Magdum dewan Iftakher Reza Chowdhury Nittya Nanda Pal md. Nahedul Morshed md. Zafar-Al-Nimari Latifa Nasrin Farooque Ahmed Department of Cardiac Surgery National Heart Foundation Hospital and Research Institute (NHFH&RI) Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Mother and Child Welfare Center Cumilla Bangladesh

Background: Serum albumin, a vital plasma protein, helps maintain intravascular colloidal osmotic pressure, cardiac output, and renal function. Low preoperative serum albumin is linked to poor outcomes, including acute kidney injury (AKI), after off-pump coronary artery bypass (OPCAB) surgery. This study aimed to assess the relationship between preoperative serum albumin levels and early postoperative renal injury. Methods: This prospective comparative cross-sectional study was conducted from August 2019 to February 2021 at the National Heart Foundation Hospital & Research Institute, Bangladesh. It included 160 adult patients with normal preoperative renal function undergoing OPCAB. Patients were divided into two groups: Group A (serum albumin ≥ 4.0 gm/dl) and Group B (serum albumin Results: Preoperative serum albumin was significantly different between groups (Group A: 4.21 ± 0.05 gm/dl, Group B: 3.69 ± 0.04 gm/dl, p = 0.028). Group B had a higher incidence of hypertension (71.25% vs. 51.25%, p st and 3rd postoperative days were higher in Group B (p th day. Postoperative AKI occurred in 18.75% of Group A and 36.25% of Group B. Multivariate regression indicated that low preoperative serum albumin is an independent risk factor for postoperative AKI (p = 0.012, OR = 1.815, CI: 0.675 - 1.162). Conclusion: Preoperative serum albumin level is a valuable predictor of postoperative renal function. Ensuring high normal serum albumin levels before surgery can help minimize the risk of postoperative AKI.

关键词： Serum Albumin Acute Kidney Injury (AKI) Off-Pump Coronary Artery Bypass Surgery Bangladesh

Prognostic Role of Preoperative Tricuspid Annular Plane Systolic Excursion (TAPSE) in Mitral Valve Replacement (MVR) for Rheumatic Mitral Stenosis Patients

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World Journal of Cardiovascular Surgery 2024年第8期14卷 115-130页

作者： Satyajit Sharma Muhit Abdullah md. Noor-E-Elahi Mozumder Munjerin Refat Synthee md. Zafar-Al-Nimari Anowarul Azim Saikat Das Gupta dewan Iftakher Raza Chowdhury Siddhartha Shankar Howlader Noel Crypian Gomes Saleh Ahmed Samir Kumar Biswas Department of Cardiac Surgery National Heart Foundation Hospital & Research Institute (NHFH & RI) Dhaka Bangladesh Department of Cardiac Surgery National Institute of Cardiovascular Diseases & Hospital Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Square Hospital Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Chattogram Bangladesh

Tricuspid annular plane systolic excursion has been proposed as a simple and reproducible parameter for quantitative assessment of the right ventricular ejection fraction. The prognostic importance of preoperative TAPSE in patients with mitral valve replacement for rheumatic mitral stenosis patients is still under focused. Therefore, the objective of the study was to predict the outcome after MVR in rheumatic mitral stenosis patients in relation to preoperative TAPSE. This comparative cross-sectional study was conducted at the Department of Cardiac Surgery, National Heart Foundation Hospital and Research Institute. A total of 72 patients of rheumatic mitral stenosis patients who underwent mitral valve replacement were included in the study. They were divided into two groups: Group A and B. Group A included 36 patients with TAPSE 0.05) except for the preoperative TAPSE. Mean TAPSE of Group A was 13.17 (±1.40) and Group B was 18.61 (±1.57), the difference was statistically significant (p 0.05). Among the postoperative complications, including postoperative atrial fibrillation was higher in Group A (30.56%) than Group B (11.11%), mean ventilation time was higher in Group A (27.78%) than Group B (5.56%), length of intensive care was higher in Group A (33.33%) than Group B (11.12%), and hospital stay was higher in Group A (25.0%) than Group B (5.56%), (p < 0.05). Higher preoperative TASPE could be used as a prognostic tool for MVR in rheumatic mitral stenosis patients in our settings.

关键词： Tricuspid Annular Plane Systolic Excursion Mitral Valve Replacement Rheumatic Heart Disease Mitral Stenosis Right Ventricular Ejection Fraction Postoperative Complications

Investigation of phase-change materials for interior temperature regulation in public transport

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Clean Energy 2022年第1期6卷 178-192页

作者： md Nahidul Islam md Nahid Hossain dewan HasanAhmed Department of Mechanical and Production Engineering Ahsanullah University of Science and Technology141-142 Love RoadTejgaon Industrial AreaDhakaBangladesh

Regulating the indoor temperature of public transport on hot sunny days is a prime concern,as both the external and internal heat sources play an active role in heat *** studies have been carried out on a bus model using sodium sulphate decahydrate as a phase-change material(PCM)that is placed in between the ceiling and the *** are conducted on a sunny day and also for different cases of external(300-W surface heater)and internal(25-W light bulb)heat *** results show that PCM,in the presence of an external heat source,can help to keep the indoor temperature lower and delay the time period for increasing the temperature by absorbing heat during the phase *** the other hand,the presence of the internal heat source contributes to a detrimental effect on the indoor temperature,which gradually increases with the elapse of *** the combination of the external and internal heat sources,it is found that the internal heat source plays a dominating factor to raise the indoor *** is revealed from the experimental results that a 12.7-mm single layer and a single PCM are not enough to counter the internal heat of 25 W unless the thickness of the PCM layer is increased to delay the increase in the indoor *** additional PCM layer with a lower melting temperature could be placed at the inner portion of the ceiling to have effective thermal-energy storage by absorbing the substantial heat gain from the internal heat sources.

关键词： latent heat sodium sulphate decahydrate phase-change material transportation thermal-energy storage

Simulation and Modelling of Water Injection for Reservoir Pressure Maintenance

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Computers, Materials & Continua 2022年第9期72卷 5761-5776页

作者： Rishi dewan Adarsh Kumar Mohammad Khalid Imam Rahmani Surbhi Bhatia md Ezaz Ahmed Department of Physics University of Petroleum&Energy StudiesDehradun 248007UttarakhandIndia Department of Computer Science University of Petroleum&Energy StudiesDehradun 248007UttarakhandIndia College of Computing and Informatics Saudi Electronic UniversityRiyadh 11673Saudi Arabia Department of Information Systems College of Computer Science and Information TechnologyKing Faisal UniversityAl Hasa 36362Saudi Arabia

Water injection has shown to be one of the most successful,efficient,and cost-effective reservoir management *** re-injecting treated and filtered water into reservoirs,this approach can help maintain reservoir pressure,increase hydrocarbon output,and reduce the environmental *** goal of this project is to create a water injection model utilizing Eclipse reservoir simulation software to better understand water injection methods for reservoir pressure maintenance.A basic reservoir model is utilized in this *** simulation designs,the reservoir length,breadth,and thickness may be changed to different *** water-oil contact was discovered at 7000 feet,and the reservoir pressure was recorded at 3000 pounds per square inch at a depth of 6900 *** aquifer chosen was of the Fetkovich type and was linked to the reservoir in the j+*** porosity was estimated to be varied,ranging from 9%to 16%.The residual oil saturation was set to 25%and the irreducible water saturation was set at 20%.The vertical permeability was set at 50 md as a *** Volume Temperature(PVT)data was used to estimate the gas and water characteristics.

关键词： Eclipse water injection reservoir modeling simulation oil saturation

Investigation of heat transfer of a building wall in the presence of phase change material(PCM)

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能源与人工环境(英文) 2020年第2期1卷 199-206页

作者： Rafid Jahangir Khan md.Zubayer Hossain Bhuiyan dewan Hasan Ahmed Department of Mechanical and Production Engineering Ahsanullah University of Science and Technology141-142 Love RoadTejgaon Industrial AreaDhakaBangladesh

The energy consumption in buildings for heating,ventilation,and air-conditioning is increasing with the in-creasing demand for thermal *** energy storage with phase change material(PCM)has attracted growing attention for its role in achieving energy conservation in buildings with thermal *** paper investigates the effect of PCM on the heat transfer rate in a building wall and the role of PCM on the indoor thermal comfort of the *** models of building wall fragments were developed for the experimental *** one model,tests were conducted for different positions of the PCM layer in the building wall to identify the optimal position of the PCM layer inside the *** another model,tests were carried out integrating PCM,air gap,and other conventional building materials(brickbat and sand),one at a time,to investigate the role of PCM on the heat transfer rate in the building wall *** results show that placing the PCM layer closer to the heat source gives a low-temperature gain of the cold water bath(indoor state)as compared with the PCM layer near the heat *** PCM,the temperature rise of the cold water bath(indoor state)of the building wall fragment was the lowest,and the slope of the temperature rise of the cold water bath becomes steadier with time i.e.,fewer temperature *** was a significant time delay for the cold water bath to reach a given *** heat required for a unit degree increase in the temperature of the cold water bath was higher and the peak heat flux of the wall was lower relative to the other building materials.

关键词： Phase change material(PCM) Thermal energy storage Building wall fragment Thermal comfort

Scalable Process to Develop Durable Conductive Cotton Fabric

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Advanced Fiber Materials 2020年第6期2卷 291-301页

作者： md.Abdullah Al.Mamun md.Touhidul Islam md.Momtaz Islam Kazi Sowrov md.Afzal Hossain dewan Murshed Ahmed Hasan Shahariar Bangladesh University of Textiles Dhaka 1208Bangladesh University of Manchester ManchesterUK Funxion Wear IncRaleighNC 27606USA

Developing a scalable process is critical to manufacture conductive fabric for commercial *** paper describes a scalable coating process that is compatible with existing industrial finishing processes of *** this process,the fabric is continuously dipped in water-based metal salt and the reducing agent solution to impart conductive particles on the fiber *** 10 consecutive cycles of dip coating,the fabric shows 6Ω/*** *** process is tuned to minimize process cost and material cost,and maximize the durability of the *** paper also introduces an easy protective coating technique of the conductive fabric that improves the durability of the conductive fabric without sacrificing the comfort properties of textile fabrics such as breathability and *** encapsulated conductive fabric shows good air-permeability and it is 6.96 cm^(3)/cm^(2)/***,the conductivity of the encapsulated fabric is quite stable after four accelerated washing ***,the fabric remains conductive on the surfaces and is suitable for using as a conductive track and connectors.

关键词： Conductive fabric Scalable process Layer by layer deposition Durability

Phase change material-based rooftop on public transport for thermal management

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Energy Storage and Saving 2023年第4期2卷 549-558页

作者： md Araf Hossan Shams Al Deen Aryan md.Sajadul Haque Noman dewan Hasan Ahmed Department of Mechanical and Production Engineering Ahsanullah University of Science and TechnologyDhakaBangladesh

Phase change materials(PCMs)are used in buildings and automobiles to control the interior temperature,following to their high thermal storage capacity and energy *** summer,controlling the interior temperature of vehicles can be difficult,especially in cities where public transportation is excessively ***,heating,ventilation,and air-conditioning systems are included to provide thermal comfort inside vehicles,but they use a significant amount fuel,which ultimately have negative impacts on the *** this study,a prototype bus model was developed from an actual bus and scaled-down to 1/20th size.A bulb was used as an internal heat source and experiments were conducted under the sun in summer to reflect scenarios of buses stuck in *** cases were considered by opening and closing the windows and doors and placing the PCM layer on the roof and covering the *** results demonstrate that when the PCM is used to cover the bulb and roof,the interior temperature can drop to the ambient temperature and remain there for a longer period of *** fact,keeping the windows and doors open results in a significantly lower indoor temperature than when they are *** results show that the heat from the engine makes a major contribution to raising the temperature inside of the *** results from the opened cases can be applied to various forms of public transportation worldwide,but for many closed vehicles,additional ducting systems integrated with PCM may be the best option.

关键词： Sodium sulfate decahydrate Phase change material Thermal energy storage Transportation

Identification of delayed system using instrumental variable method

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控制理论与应用（英文版） 2012年第3期10卷 380-384页

作者： Dalvinder KAUR Lillie dewan Electronics and Instrumentation Department TITS BhiwaniMD University RohtakHaryanaIndia Electrical Engineering Department NIT KurukshetraHaryanaIndia

System identification uses system inputs and outputs to raise mathematical models. Various techniques of system identification exist that offer a nominal model and an uncertainty bound. Many practical systems such as thermal processes ＆ chemical processes have inbuilt time delay. If the time delay used in the system model for controller design does not concur with the actual process time delay, a closed-loop system may be unstable or demonstrate unacceptable transient response characteristics so here the time delay is assumed to be time-invariant. This paper proposes on-line identification of delayed complex/uncertain systems using instrumental variable （IV） method. Parametric uncertainty has been considered which may be represented by variations of certain system parameters over some possible range. This method allows consistent estimation when the system parameters are associated with the noise terms, as the IV methods （IVM＇s） usually make no assumption on the noise correlation configuration. The faster convergence of the parameters including noise terms has been proved in this paper. Iterative prefiltering （IP） method has also been used for the identification of the delayed uncertain system and the graphical results given in this paper demonstrate that the convergence results are inferior to the instrumental variable method.

关键词： Parametric uncertainty Time delay Sequential nonlinear Instrumental variable Iterative prefiltering

Curcumin reverses T cell-mediated adaptive immune dysfunctions in tumor-bearing hosts

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Cellular & Molecular Immunology 2010年第4期7卷 306-315页

作者： Sankar Bhattacharyya dewan md Sakib Hossain Suchismita Mohanty Gouri Sankar Sen Sreya Chattopadhyay Shuvomoy Banerjee Juni Chakraborty Kaushik Das Diptendra Sarkar Tanya Das Gaurisankar Sa Division of Molecular Medicine Bose InstituteKolkataIndia

Immune dysfunction is well documented during tumor progression and likely contributes to tumor immune ***81 cytotoxic T lymphocytes(CTLs)are involved in antigen-specific tumor destruction and CD41 T cells are essential for helping this CD81 T cell-dependent tumor *** often target and inhibit T-cell function to escape from immune *** dysfunction includes loss of effector and memory T cells,bias towards type 2 cytokines and expansion of T regulatory(Treg)*** has previously been shown to have antitumor activity and some research has addressed the immunoprotective potential of this plant-derived polyphenol in tumor-bearing *** we examined the role of curcumin in the prevention of tumor-induced dysfunction of T cell-based immune *** observed severe loss of both effector and memory T-cell populations,downregulation of type 1 and upregulation of type 2 immune responses and decreased proliferation of effector T cells in the presence of ***,in turn,prevented this loss of T cells,expanded central memory T cell(TCM)/effector memory T cell(TEM)populations,reversed the type 2 immune bias and attenuated the tumor-induced inhibition of T-cell proliferation in tumor-bearing *** investigation revealed that tumor burden upregulated Treg cell populations and stimulated the production of the immunosuppressive cytokines transforming growth factor(TGF)-b and IL-10 in these ***,however,inhibited the suppressive activity of Treg cells by downregulating the production of TGF-b and IL-10 in these *** importantly,curcumin treatment enhanced the ability of effector T cells to kill cancer ***,our observations suggest that the unique properties of curcumin may be exploited for successful attenuation of tumor-induced suppression of cell-mediated immune responses.

关键词： CD41/CD81 T cell Effector T cell T-regulatory cell FoxP3 Th1/Th2