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1.
Indian J Med Res ; 159(1): 91-101, 2024 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-38344919

RESUMEN

BACKGROUND OBJECTIVES: The clinical course of COVID-19 and its prognosis are influenced by both viral and host factors. The objectives of this study were to develop a nationwide platform to investigate the molecular epidemiology of SARS-CoV-2 (Severe acute respiratory syndrome Corona virus 2) and correlate the severity and clinical outcomes of COVID-19 with virus variants. METHODS: A nationwide, longitudinal, prospective cohort study was conducted from September 2021 to December 2022 at 14 hospitals across the country that were linked to a viral sequencing laboratory under the Indian SARS-CoV-2 Genomics Consortium. All participants (18 yr and above) who attended the hospital with a suspicion of SARS-CoV-2 infection and tested positive by the reverse transcription-PCR method were included. The participant population consisted of both hospitalized as well as outpatients. Their clinical course and outcomes were studied prospectively. Nasopharyngeal samples collected were subjected to whole genome sequencing to detect SARS-CoV-2 variants. RESULTS: Of the 4972 participants enrolled, 3397 provided samples for viral sequencing and 2723 samples were successfully sequenced. From this, the evolution of virus variants of concern including Omicron subvariants which emerged over time was observed and the same reported here. The mean age of the study participants was 41 yr and overall 49.3 per cent were female. The common symptoms were fever and cough and 32.5 per cent had comorbidities. Infection with the Delta variant evidently increased the risk of severe COVID-19 (adjusted odds ratio: 2.53, 95% confidence interval: 1.52, 4.2), while Omicron was milder independent of vaccination status. The independent risk factors for mortality were age >65 yr, presence of comorbidities and no vaccination. INTERPRETATION CONCLUSIONS: The authors believe that this is a first-of-its-kind study in the country that provides real-time data of virus evolution from a pan-India network of hospitals closely linked to the genome sequencing laboratories. The severity of COVID-19 could be correlated with virus variants with Omicron being the milder variant.


Asunto(s)
COVID-19 , Femenino , Humanos , Masculino , Progresión de la Enfermedad , Hospitales , Estudios Prospectivos , SARS-CoV-2/genética , Adulto , Adolescente , Anciano , Persona de Mediana Edad
2.
J Sci Food Agric ; 2024 Jun 24.
Artículo en Inglés | MEDLINE | ID: mdl-38922926

RESUMEN

Vitamin B12, a water-soluble essential micronutrient, plays a pivotal role in numerous physiological processes in the human body. This review meticulously examines the structural complexity and the diverse mechanisms through which vitamin B12 exerts its preventive effects against a spectrum of health conditions, including pernicious anaemia, neurological disorders, obesity, diabetes, dyslipidaemia and complications in foetal development. The selection of articles for this review was conducted through a systematic search across multiple scientific databases, including PubMed, Scopus and Web of Science. Criteria for inclusion encompassed relevance to the biochemical impact of vitamin B12 on health, peer-reviewed status and publication within the last decade. Exclusion criteria were non-English articles and studies lacking empirical evidence. This stringent selection process ensured a comprehensive analysis of vitamin B12's multifaceted impact on health, covering its structure, bioavailable forms and mechanisms of action. Clinical studies highlighting its therapeutic potential, applications in food fortification and other utilizations are also discussed, underscoring the nutrient's versatility. This synthesis aims to provide a clear understanding of the integral role of vitamin B12 in maintaining human health and its potential in clinical and nutritional applications. © 2024 The Author(s). Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

3.
Inorg Chem ; 62(19): 7403-7412, 2023 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-37140965

RESUMEN

We present a comprehensive study of the synthesis, structure, and magnetic properties of the honeycomb oxide Na3Mn2SbO6 supported by neutron diffraction, heat capacity, and magnetization measurements. The refinements of the neutron diffraction patterns (150, 50, and 45 K) using the Rietveld method confirm the monoclinic (S. G. C2/m) structure. Temperature-dependent magnetic susceptibilities measured at varying fields along with the heat capacity measurements demonstrate the coexistence of long-range ordering (∼42 K) and short-range ordering (∼65 K). The field-dependent isothermal magnetization measurements at 5 K indicate a spin-flop transition around 5 T. Rietveld refinements of the low-temperature (below 45 K) neutron diffraction data further confirm the long-range magnetic ordering. In addition, the temperature variation of the lattice parameters obtained from the neutron powder diffraction analysis exhibited a distinct anomaly near the antiferromagnetic transition temperature. The appearance of the concomitant broadened backgrounds in the neutron powder diffraction data collected at 80, 50, and 45 K supports the short-range ordering. The resultant magnetic structure consists of spins that are aligned antiparallel with the nearest neighbors and also with the spins of the adjacent honeycomb layers. The occurrence of a fully ordered magnetic ground state (Neel antiferromagnetic (AFM)) in Na3Mn2SbO6 consolidates the significance of fabricating new honeycomb oxides.

4.
Sensors (Basel) ; 23(7)2023 Mar 24.
Artículo en Inglés | MEDLINE | ID: mdl-37050484

RESUMEN

In conventional modern vehicles, the Internet of Things-based automotive embedded systems are used to collect various data from real-time sensors and store it in the cloud platform to perform visualization and analytics. The proposed work is to implement computer vision-aided vehicle intercommunication V2V (vehicle-to-vehicle) implemented using the Internet of Things for an autonomous vehicle. Computer vision-based driver assistance supports the vehicle to perform efficiently in critical transitions such as lane change or collision avoidance during the autonomous driving mode. In addition to this, the main work emphasizes observing multiple parameters of the In-Vehicle system such as speed, distance covered, idle time, and fuel economy by the electronic control unit are evaluated in this process. Electronic control unit through brake control module, powertrain control module, transmission control module, suspension control module, and battery management system helps to predict the nature of drive-in different terrains and also can suggest effective custom driving modes for advanced driver assistance systems. These features are implemented with the help of the vehicle-to-infrastructure protocol, which collects data through gateway nodes that can be visualized in the IoT data frame. The proposed work involves the process of analyzing and visualizing the driver-influencing factors of a modern vehicle that is in connection with the IoT cloud platform. The custom drive mode suggestion and improvisation had been completed with help of computational analytics that leads to the deployment of an over-the-air update to the vehicle embedded system upgradation for betterment in drivability. These operations are progressed through a cloud server which is the prime factor proposed in this work.

5.
Niger J Clin Pract ; 26(12): 1800-1807, 2023 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-38158345

RESUMEN

BACKGROUND: Extraoral and intraoral dental photographs serve as preoperative records and document the entire treatment. Correctly composed orthodontic photographs are crucial for remote diagnosis and may serve as a bulwark against medicolegal challenges. MATERIALS AND METHODS: In this prospective study, intraoral frontal photographs of patients with ideal occlusion were taken using two types of lenses (EF-S 18-55 mm f/3.5-5.6 IS STM lens (Canon, Tokyo, JP), SP 90 mm F/2.8 MACRO VC lens (Model F017 Tamron, NY, USA)) and two different ring flash systems (Meike FC-100 Macro Ring LED Light (Meike, China), Macro Ring flash Lite YN-14EX (Yongnuo digital, China)). The combination of lens and flash used was grouped into four groups. Twenty-eight intraoral photographs of patients were taken. An image quality assessment survey was distributed among two groups - 50 orthodontists and 50 other dental specialists. RESULTS: The participants were asked to assess all the intraoral images and subjectively score them on a scale of one to ten, with one being very poor and ten being excellent, considering the sharpness, color, brightness, contrast, and overall quality of the image. The general dentists rated the images taken with a 90-mm macro lens and ring flash as the best quality photographs. Images obtained using an 18-55 mm lens and ring LED received significantly lesser scores and were graded good by dentists. CONCLUSION: This combination of lens and flash may prove a valuable investment in the long-term aiding in excellent dental images for diagnosis and treatment monitoring.


Asunto(s)
Fotografía Dental , Humanos , Fotografía Dental/métodos , Estudios Prospectivos , China
6.
Nanotechnology ; 33(47)2022 Sep 07.
Artículo en Inglés | MEDLINE | ID: mdl-35970140

RESUMEN

The thermal performance of different hybrid nanofluids on the mini hexagonal tube heat sink has been investigated experimentally. Al2O3/SiO2-DIW, Al2O3/CuO-DIW, and CuO/SiO2-DIW nanofluids have been used as the working fluids. The aggregate of 0.01 volume fraction of Al2O3, CuO, and SiO2nanoparticles for hybridizing ratios (80:20) has been considered to prepare deionized water-based hybrid nanofluids. The thermal performance of three different hybrid nanofluids inside the mini hexagonal tube heat sink has been assessed. The varying volumetric flow rates of 15-50 lph have been maintained on the hexagonal tube side and 50 lph on the mini passage side. Herein, the proposed hexagonal-shaped heat sink provides a larger heat contact surface to exchange the heat between the hybrid nanofluids and hot DIW. It is divulged that the increase in the volume flow rate of nanofluids promotes the higher Brownian motion, leading to an increase in convective heat transfer. Amongst three hybrid nanofluids, CuO/SiO2-DIW nanofluids have revealed a slight increase in pumping power while increasing the volume flow rate. From the experimental results, it is shown that the heat transfer coefficient, effectiveness, and Nusselt number have been improved by 54.5%, 42%, and 28.4%, respectively, for Al2O3/CuO-DIW nanofluids. Thus, Al2O3/CuO-DIW nanofluid can be deemed to be an efficient working fluid for the miniature heat sinks to accelerate the heat transfer rates.

7.
Inorg Chem ; 59(20): 15144-15153, 2020 Oct 19.
Artículo en Inglés | MEDLINE | ID: mdl-33021788

RESUMEN

In this paper, the hyperkagome lattice of Gd spins in a garnet compound, Gd3CrGa4O12, is studied using bulk measurements and density functional computations, and the observation of large magnetocaloric effect corresponding to an entropy change, ΔSm = 45 J kg-1K-1 (≈ 45 J mol-1K-1) at 2 K, 8 T is reported. Though the compound defies long-range magnetic order down to 0.4 K, a broad feature below 10 K is observed in the specific heat with two low temperature anomalies at T* ≈ 0.7 K and TS ≈ 2.45 K. The anomaly at T* is reminiscent of one in Gd3Ga5O12, where it is related to the development of a complex magnetic phase, whereas the TS-peak is accounted for by a multilevel Schottky-like model. The spin-lattice relaxation times studied by nuclear magnetic resonance experiments show that the relaxation is dominated by the magnetic fluctuations in Cr which has a longer relaxation time compared to that of the garnet, Lu3CrGa4O12 containing a nonmagnetic rare earth. Our first-principles density functional theory calculations agree well with the experimental results and support short-range magnetic order in the Gd-sublattice and antiferromagnetism in the Cr-sublattice. The importance of spin fluctuations and short-range order in the rare earth and transition metal lattices in garnets resulting in large magnetocaloric effect is brought out through this work.

8.
Inorg Chem ; 57(20): 12456-12460, 2018 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-30253103

RESUMEN

Large single crystals of Yb2Ge2O7 in the cubic Fd3̅ m space group, are synthesized and characterized from a high-temperature hydrothermal method (650°C/200 MPa in 1 M KF). The cubic phase displays spin frustration and possibly nonclassical quantum-spin behavior at low temperature. This is the first report of single crystals of this important phase of size and quality suitable for single-crystal neutron diffraction.

9.
J Biochem Mol Toxicol ; 32(9): e22192, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-29992715

RESUMEN

High density lipoprotein (HDL)-macrophage interactions have the potential to modulate macrophage function in a beneficial way to prevent the development of lipid-loaded foam cell formation in atherosclerosis. Although HDL is atheroprotective, it can become dysfunctional in chronic inflammatory conditions and increase cardiovascular risk. Here, we examined the effect of dysfunctional-HDL from patients with coronary artery disease, on macrophage function in comparison to functional-HDL from controls. Exposure of macrophages to dysfunctional-HDL for 24 h resulted significant increase in cellular oxidative stress, cholesterol, and cytotoxicity. It also stimulated mitochondrial membrane depolarization, DNA damage, apoptosis, and cleavage of poly (ADP-ribose) polymerase, which are characteristics of proapoptotic pathways. In contrast, functional-HDL treatment maintained cholesterol homeostasis, essential membrane potential, DNA integrity, and cell survival. These results demonstrate that HDL from coronary artery disease (CAD) patient promotes proatherogenic effects that in turn trigger macrophage apoptosis, an important feature in atherogenesis and thereby providing new insight in our understanding of the atherogenic mechanisms.


Asunto(s)
Apoptosis , Colesterol/metabolismo , Enfermedad Coronaria/metabolismo , Daño del ADN , Células Espumosas/metabolismo , Macrófagos/metabolismo , Estrés Oxidativo , Absorción Fisiológica , Adulto , Transporte Biológico , Supervivencia Celular , Células Cultivadas , Ensayo Cometa , Enfermedad Coronaria/sangre , Enfermedad Coronaria/inmunología , Enfermedad Coronaria/patología , Medio de Cultivo Libre de Suero , Femenino , Células Espumosas/inmunología , Células Espumosas/patología , Humanos , Macrófagos/citología , Macrófagos/inmunología , Macrófagos/patología , Masculino , Potencial de la Membrana Mitocondrial , Persona de Mediana Edad , Poli(ADP-Ribosa) Polimerasas/metabolismo , Proteolisis , Especies Reactivas de Oxígeno/metabolismo
10.
Clin Exp Hypertens ; 40(6): 534-538, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-29182374

RESUMEN

Epigenetic regulation of arterial blood pressure mediated through mirSNPs in renin-angiotensin aldosterone system (RAAS) genes is a less explored hypothesis. Recently, the mirSNP rs11174811 in the 3'UTR of the AVPR1A gene was associated with higher arterial blood pressure in a large study population from the Study of Myocardial Infarctions Leiden (SMILE). The aim of the present study was to replicate the association of mirSNP rs11174811 with blood pressure outcomes and hypertension in a south Indian population. Four hundred and fifteen hypertensive cases and 416 normotensive controls were genotyped using a 5' nuclease allelic discrimination assay. Logistic regression was used to test the association of mirSNP rs11174811 with the hypertension phenotype. Censored normal regression was used to test the association of the polymorphism with continuous blood pressure outcomes such as systolic and diastolic blood pressure. The mirSNP rs11174811 did not show any significant association with hypertension. The adjusted odds ratio was 1.02, with 95% CI of 0.72 to 1.45 (p = 0.909). The mean systolic and diastolic blood pressure values were not significantly different across the three genotypic groups, between hypertensives and normotensives, or when stratified by gender. Despite having a similar minor allele frequency (MAF) of 14.5% compared with the SMILE cohort, our results did not support an association of the mirSNP rs11174811 with the hypertension phenotype or with continuous blood pressure outcomes in the south Indian population.


Asunto(s)
Presión Arterial/genética , Hipertensión/genética , Receptores de Vasopresinas/genética , Población Blanca/genética , Regiones no Traducidas 3' , Anciano , Alelos , Presión Sanguínea/genética , Determinación de la Presión Sanguínea , Estudios de Casos y Controles , Estudios de Cohortes , Epigénesis Genética , Femenino , Frecuencia de los Genes , Genotipo , Humanos , India , Modelos Logísticos , Masculino , Persona de Mediana Edad , Oportunidad Relativa , Polimorfismo Genético , Polimorfismo de Nucleótido Simple , Sistema Renina-Angiotensina/genética
11.
Mol Cell Biochem ; 427(1-2): 23-34, 2017 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-27995417

RESUMEN

Although high-density lipoprotein is atheroprotective, it can become dysfunctional in chronic inflammatory conditions and increase cardiovascular risk. We previously demonstrated that HDL from subjects with documented coronary artery disease is dysfunctional and is pro-oxidant/proinflammatory in macrophages. Here we examined the influence of dysfunctional/proinflammatory HDL (piHDL) on lipid accumulation in human macrophages, in comparison to functional HDL (nHDL). Exposure of macrophages to piHDL, in contrast to nHDL, resulted in oxidative stress and marked uptake of lipids from piHDL, leading to the formation of foam cell phenotype as noted by oil red O staining with concomitant increase in total cellular cholesterol content. Using western blotting, we identified that piHDL profoundly upregulated the expression of scavenger receptor CD36 and suppressed the expression of ABCG1 and SRB1 in macrophages, thereby facilitating cholesterol influx capacity of macrophages. We then identified that CD36 did not act alone, indeed it was activated in macrophages along with ERK/MAPK, in response to piHDL, which in turn led to lipid accumulation as well as proinflammatory response via activation of NFkB and subsequent release of proinflammatory markers-TNF-ά and MMP-9. These effects were confirmed using pharmacological inhibitors for either CD36 or ERK/MAPK. Furthermore, piHDL treatment moderately activated PPAR-γ and Nrf2, the known regulators of CD36 in macrophages, suggesting that the two forms of HDL differentially regulate CD36 expression. Taken together, the results demonstrate that a novel CD36-ERK/MAPK-dependent mechanism is involved in macrophage lipid accumulation by piHDL, there by revealing the importance of functional deficiency in HDL and its potential link to atherogenesis.


Asunto(s)
Antígenos de Neoplasias/biosíntesis , Enfermedad de la Arteria Coronaria/sangre , Células Espumosas/metabolismo , Lipoproteínas HDL/farmacología , Sistema de Señalización de MAP Quinasas/efectos de los fármacos , Tetraspaninas/biosíntesis , Transportador de Casetes de Unión a ATP, Subfamilia G, Miembro 1/biosíntesis , Adulto , Enfermedad de la Arteria Coronaria/patología , Femenino , Células Espumosas/patología , Regulación de la Expresión Génica/efectos de los fármacos , Humanos , Lipoproteínas HDL/sangre , Masculino , Metaloproteinasa 9 de la Matriz/biosíntesis , Persona de Mediana Edad , Factor 2 Relacionado con NF-E2/metabolismo , PPAR gamma/metabolismo , Receptores Depuradores de Clase B/biosíntesis , Factor de Necrosis Tumoral alfa/metabolismo
12.
Mol Biol Rep ; 44(1): 97-108, 2017 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-27686559

RESUMEN

The extraction of genomic DNA is the crucial first step in large-scale epidemiological studies. Though there are many popular DNA isolation methods from human whole blood, only a few reports have compared their efficiencies using both end-point and real-time PCR assays. Genomic DNA was extracted from coronary artery disease patients using solution-based conventional protocols such as the phenol-chloroform/proteinase-K method and a non-phenolic non-enzymatic Rapid-Method, which were evaluated and compared vis-a-vis a commercially available silica column-based Blood DNA isolation kit. The appropriate method for efficiently extracting relatively pure DNA was assessed based on the total DNA yield, concentration, purity ratios (A260/A280 and A260/A230), spectral profile and agarose gel electrophoresis analysis. The quality of the isolated DNA was further analysed for PCR inhibition using a murine specific ATP1A3 qPCR assay and mtDNA/Y-chromosome ratio determination assay. The suitability of the extracted DNA for downstream applications such as end-point SNP genotyping, was tested using PCR-RFLP analysis of the AGTR1-1166A>C variant, a mirSNP having pharmacogenetic relevance in cardiovascular diseases. Compared to the traditional phenol-chloroform/proteinase-K method, our results indicated the Rapid-Method to be a more suitable protocol for genomic DNA extraction from human whole blood in terms of DNA quantity, quality, safety, processing time and cost. The Rapid-Method, which is based on a simple salting-out procedure, is not only safe and cost-effective, but also has the added advantage of being scaled up to process variable sample volumes, thus enabling it to be applied in large-scale epidemiological studies.


Asunto(s)
Fraccionamiento Químico/métodos , Enfermedad de la Arteria Coronaria/genética , ADN/sangre , ADN/normas , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Adulto , Animales , ADN/aislamiento & purificación , ADN Mitocondrial/sangre , ADN Mitocondrial/aislamiento & purificación , ADN Mitocondrial/normas , Femenino , Humanos , Masculino , Ratones , Persona de Mediana Edad , ATPasa Intercambiadora de Sodio-Potasio/genética , Cromosoma Y/genética
13.
BMC Public Health ; 17(1): 10, 2017 01 05.
Artículo en Inglés | MEDLINE | ID: mdl-28056897

RESUMEN

BACKGROUND: Recognizing patterns of coronary heart disease (CHD) risk in families helps to identify and target individuals who may have the most to gain from preventive interventions. The overall goal of the study is to test the effectiveness and sustainability of an integrated care model for managing cardiovascular risk in high risk families. The proposed care model targets the structural and environmental conditions that predispose high risk families to development of CHD through the following interventions: 1) screening for cardiovascular risk factors, 2) providing lifestyle interventions 3) providing a framework for linkage to appropriate primary health care facility, and 4) active follow-up of intervention adherence. METHODS: Initially, a formative qualitative research component will gather information on understanding of diseases, barriers to care, specific components of the intervention package and feedback on the intervention. Then a cluster randomized controlled trial involving 740 families comprising 1480 participants will be conducted to determine whether the package of interventions (integrated care model) is effective in reducing or preventing the progression of CHD risk factors and risk factor clustering in families. The sustainability and scalability of this intervention will be assessed through economic (cost-effectiveness analyses) and qualitative evaluation (process outcomes) to estimate value and acceptability. Scalability is informed by cost-effectiveness and acceptability of the integrated cardiovascular risk reduction approach. DISCUSSION: Knowledge generated from this trial has the potential to significantly affect new programmatic policy and clinical guidelines that will lead to improvements in cardiovascular health in India. TRIAL REGISTRATION NUMBER: NCT02771873, registered in May 2016 ( https://clinicaltrials.gov/ct2/show/results/NCT02771873 ).


Asunto(s)
Enfermedades Cardiovasculares/prevención & control , Familia , Predisposición Genética a la Enfermedad , Estilo de Vida , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Enfermedades Cardiovasculares/genética , Femenino , Humanos , India , Masculino , Persona de Mediana Edad , Factores de Riesgo , Conducta de Reducción del Riesgo , Resultado del Tratamiento , Adulto Joven
15.
BMC Cardiovasc Disord ; 16: 12, 2016 Jan 14.
Artículo en Inglés | MEDLINE | ID: mdl-26769341

RESUMEN

BACKGROUND: There are no recent data on prevalence of coronary artery disease (CAD) in Indians. The last community based study from Kerala, the most advanced Indian state in epidemiological transition, was in 1993 that reported 1.4% definite CAD prevalence. We studied the prevalence of CAD and its risk factors among adults in Kerala. METHODS: In a community-based cross sectional study, we selected 5167 adults (mean age 51 years, men 40.1%) using a multistage cluster sampling method. Information on socio-demographics, smoking, alcohol use, physical activity, dietary habits and personal history of hypertension, diabetes, and CAD was collected using a structured interview schedule. Anthropometry, blood pressure, electrocardiogram, and biochemical investigations were done using standard protocols. CAD and its risk factors were defined using standard criteria. Comparisons of age adjusted prevalence were done using two tailed proportion tests. RESULTS: The overall age-adjusted prevalence of definite CAD was 3.5%: men 4.8%, women 2.6% (p < 0.001). Prevalence of any CAD was 12.5%: men 9.8%, women 14.3% (p < 0.001). There was no difference in definite CAD between urban and rural population. Physical inactivity was reported by 17.5 and 18% reported family history of CAD. Other CAD risk factors detected in the study were: overweight or obese 59%, abdominal obesity 57%, hypertension 28%, diabetes 15%, high total cholesterol 52% and low level of high density lipoprotein cholesterol 39%. Current smoking was reported only be men (28%). CONCLUSION: The prevalence of definite CAD in Kerala increased nearly three times since 1993 without any difference in urban and rural areas. Most risk factors of CAD were highly prevalent in the state. Both population and individual level approaches are warranted to address the high level of CAD risk factors to reduce the increasing prevalence of CAD in this population.


Asunto(s)
Consumo de Bebidas Alcohólicas/epidemiología , Enfermedad de la Arteria Coronaria/epidemiología , Diabetes Mellitus/epidemiología , Dislipidemias/epidemiología , Hipertensión/epidemiología , Obesidad Abdominal/epidemiología , Fumar/epidemiología , Adulto , Anciano , Antropometría , Presión Sanguínea , Estudios Transversales , Dieta , Electrocardiografía , Femenino , Humanos , India/epidemiología , Masculino , Persona de Mediana Edad , Actividad Motora , Obesidad/epidemiología , Sobrepeso/epidemiología , Prevalencia , Factores de Riesgo , Población Rural/estadística & datos numéricos , Población Urbana/estadística & datos numéricos , Adulto Joven
16.
J Heart Valve Dis ; 25(2): 195-197, 2016 03.
Artículo en Inglés | MEDLINE | ID: mdl-27989066

RESUMEN

Persistent pulmonary artery hypertension (PAH) after balloon mitral valvuloplasty (BMV) is not uncommon, and is generally associated with established pulmonary vascular disease, an inadequate result, or the development of mitral regurgitation. An unfavorable mitral valve morphology with a smaller post-procedural mitral valve area is among the most common causes of the condition. While routine cardiac catheterization is no longer recommended prior to intervention in valvular heart disease, patients with persistent PAH after BMV should undergo a thorough evaluation before they are considered for repeat BMV. Here, a rare case is reported of symptomatic persistent PAH in a patient referred for a third BMV, less than one year after the previous intervention, where a hypertensive patent ductus arteriosus was identified, the closure of which led to a regression of the PAH.


Asunto(s)
Presión Arterial , Valvuloplastia con Balón/efectos adversos , Conducto Arterioso Permeable/fisiopatología , Hipertensión Pulmonar/etiología , Estenosis de la Válvula Mitral/terapia , Válvula Mitral/fisiopatología , Arteria Pulmonar/fisiopatología , Adulto , Aortografía , Cateterismo Cardíaco/instrumentación , Conducto Arterioso Permeable/complicaciones , Conducto Arterioso Permeable/diagnóstico por imagen , Conducto Arterioso Permeable/terapia , Ecocardiografía Doppler en Color , Femenino , Humanos , Hipertensión Pulmonar/diagnóstico por imagen , Hipertensión Pulmonar/fisiopatología , Estenosis de la Válvula Mitral/diagnóstico por imagen , Estenosis de la Válvula Mitral/fisiopatología , Arteria Pulmonar/diagnóstico por imagen , Factores de Riesgo , Dispositivo Oclusor Septal , Resultado del Tratamiento
17.
Phys Chem Chem Phys ; 17(18): 12207-14, 2015 May 14.
Artículo en Inglés | MEDLINE | ID: mdl-25892296

RESUMEN

Temperature-dependent Raman and dielectric measurements have been carried out on (C2H5NH3)2CdCl4 single crystals. Raman studies reveal the presence of two structural phase transitions below room temperature at 216 K and 114 K. The phase transitions are marked by anomalies in temperature dependence of wave-number and full width half maximum (FWHM) of several vibrational modes. The transitions are also accompanied by anomalies in dielectric measurements. Raman and dielectric data indicate that the transition at 216 K is order-disorder in nature and is driven by re-orientation of organic ions, while the transition at 114 K is due to coupling between the CdCl6 octahedron and the organic chain. Further high temperature dielectric measurements reveal the presence of one more structural phase transition around 473 K across which dispersion in dielectric parameters is observed. The activation energies and relaxation time obtained for high temperature dielectric phases are characteristic of combined reorientation motions of alkyl ammonium cations.

18.
Dalton Trans ; 53(14): 6423-6435, 2024 Apr 02.
Artículo en Inglés | MEDLINE | ID: mdl-38506269

RESUMEN

Combining the experimental techniques of high-resolution X-ray diffraction, magnetometry, specific heat measurement, and X-ray photoelectron, Raman and dielectric spectroscopy techniques, we have studied the influence of La and Cr doping on the crystal structure and magnetism of the room temperature Aurivillius multiferroic Bi5Ti3FeO15 by investigating the physical properties of (Bi4La)Ti3FeO15 and Bi5Ti3 (Fe0.5Cr0.5)O15. The parent (Bi5Ti3FeO15) and the doped ((Bi4La)Ti3FeO15 and Bi5Ti3(Fe0.5Cr0.5)O15) compounds crystallize in the A21am space group, which is confirmed through our analysis of high-resolution synchrotron X-ray diffraction data obtained on phase-pure polycrystalline powders. We determined the oxidation states of the metal atoms in the studied compounds as Fe3+, Ti4+, Cr3+, and La3+ through the analysis of X-ray photoelectron spectroscopy data. The magnetic susceptibilities of the three compounds are marked by the absence of a long-range ordered ground state, but dominated by superparamagnetic clusters with dominant antiferromagnetic interactions. This signature of short-range magnetism is also seen in specific heat as a low temperature enhancement which is suppressed upon the application of external magnetic fields up to 8 T. Our dielectric spectroscopy experiments showed that the three studied compounds display similar features in the dielectric constant measured as a function of frequency. However, upon doping La at the Bi site, the width of the ferroelectric hysteresis loop increases for (Bi4La)Ti3FeO15 compared to that of the parent compound Bi5Ti3FeO15, and with Cr doping, Bi5Ti3(Fe0.5Cr0.5)O15 becomes a leaky dielectric. The resilience of the Aurivillius crystal structure towards doping of La at the Bi site and Cr at the Fe site is clearly seen in the bulk properties of magnetic susceptibility, specific heat and the average crystal structure. The relevance of changes in the local structure is evident from our Raman spectroscopy and X-ray pair distribution function studies.

19.
Indian Heart J ; 65(3): 243-9, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23809375

RESUMEN

BACKGROUND: There is paucity of reliable contemporary data on prevalence of coronary artery disease (CAD) and risk factors in Indians. Only a few studies on prevalence of CAD have been conducted in Kerala, a Southern Indian state. The main objective of the Cardiological Society of India Kerala Chapter Coronary Artery Disease and Its Risk Factors Prevalence Study (CSI Kerala CRP Study) was to determine the prevalence of CAD and risk factors of CAD in men and women aged 20-79 years in urban and rural settings of three geographical areas of Kerala. METHODS: The design of the study was cross-sectional population survey. We estimated the sample size based on an anticipated prevalence of 7.4% of CAD for rural and 11% for urban Kerala. The derived sample sizes for rural and urban areas were 3000 and 2400, respectively. The urban areas for sampling constituted one ward each from three municipal corporations at different parts of the state. The rural sample was drawn from two panchayats each in the same districts as the urban sample. One adult from each household in the age group of 20-59 years was selected using Kish method. All subjects between 60 and 79 years were included from each household. A detailed questionnaire was administered to assess the risk factors, history of CAD, family history, educational status, socioeconomic status, dietary habits, physical activity and treatment for CAD; anthropometric measurements, blood pressure, electrocardiogram and fasting blood levels of glucose and lipids were recorded.


Asunto(s)
Enfermedad de la Arteria Coronaria/epidemiología , Adulto , Anciano , Estudios Transversales , Femenino , Humanos , India/epidemiología , Masculino , Persona de Mediana Edad , Prevalencia , Factores de Riesgo , Población Rural/estadística & datos numéricos , Encuestas y Cuestionarios , Población Urbana/estadística & datos numéricos , Adulto Joven
20.
Indian J Nephrol ; 33(2): 128-131, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37234428

RESUMEN

Postpartum pulmonary syndrome as lupus flares in inactive or mild lupus is uncommon. The diagnosis and management of postpartum lupus flare in second pregnancy presenting with crescentic lupus nephritis (LN), secondary thrombotic microangiopathy (TMA), and severe lupus vasculitis in an undiagnosed systemic lupus erythematosus is extremely challenging. Here, in this case report, we present a young lady who presented with postpartum acute kidney injury (AKI) with systemic complaints about 4 weeks post-term uneventful delivery. Renal biopsy was suggestive of crescentic LN with severe lupus vasculitis. The stormy course was further complicated with diffuse alveolar hemorrhage, portal venous thrombosis, TMA, and anuric AKI requiring renal replacement therapy. She received multiple sessions of plasmapheresis, steroid, intravenous immunoglobulin, inj. cyclophosphamide, and started showing improvement after about 6 weeks of presentation.

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