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1.
Osteoporos Int ; 32(10): 2095-2103, 2021 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-33877383

RESUMEN

This study investigated risk factors for osteonecrosis involving multiple joints (MJON) among glucocorticoid-treated patients. The best predictor of MJON was cumulative oral glucocorticoid dose. Risk of MJON was 12-fold higher in patients who had a second risk factor for osteonecrosis. Further research is needed into strategies for prevention of MJON. INTRODUCTION: Osteonecrosis (ON) is a debilitating musculoskeletal condition in which bone cell death can lead to mechanical failure. When multiple joints are affected, pain and disability are compounded. Glucocorticoid treatment is one of the most common predisposing factors for ON. This study investigated risk factors for ON involving multiple joints (MJON) among glucocorticoid-treated patients. METHODS: Fifty-five adults with glucocorticoid-induced ON were prospectively enrolled. MJON was defined as ON in ≥ three joints. Route, dose, duration, and timing of glucocorticoid treatment were assessed. RESULTS: Mean age of enrolled subjects was 44 years, 58% were women. Half had underlying conditions associated with increased ON risk: systemic lupus erythematosus (29%), acute lymphoblastic leukemia (11%), HIV (9%), and alcohol use (4%). Mean daily oral dose of glucocorticoids was 29 mg. Average cumulative oral dose was 30 g over 5 years. The best predictor of MJON was cumulative oral glucocorticoid dose. For each increase of 1,000 mg, risk of MJON increased by 3.2% (95% CI 1.03, 1.67). Glucocorticoid exposure in the first 6 months of therapy, peak dose (oral or IV), and mean daily dose did not independently increase risk of MJON. The risk of MJON was 12-fold in patients who had a second risk factor (95% CI 3.2, 44.4). CONCLUSIONS: Among patients with glucocorticoid-induced ON, cumulative oral dose was the best predictor of multi-joint disease; initial doses of IV and oral glucocorticoids did not independently increase risk. Further research is needed to better define optimal strategies for prevention and treatment of MJON.


Asunto(s)
Artropatías , Lupus Eritematoso Sistémico , Osteonecrosis , Adulto , Femenino , Glucocorticoides/efectos adversos , Humanos , Osteonecrosis/inducido químicamente , Osteonecrosis/epidemiología , Factores de Riesgo
2.
BMC Health Serv Res ; 21(1): 242, 2021 Mar 18.
Artículo en Inglés | MEDLINE | ID: mdl-33736629

RESUMEN

BACKGROUND: Insufficient cost data and limited capacity constrains the understanding of the actual resources required for effective TB control. This study used process maps and time-driven activity-based costing to document TB service delivery processes. The analysis identified the resources required to sustain TB services in Zimbabwe, as well as several opportunities for more effective and efficient use of available resources. METHODS: A multi-disciplinary team applied time-driven activity-based costing (TDABC) to develop process maps and measure the cost of clinical pathways used for Drug Susceptible TB (DS-TB) at urban polyclinics, rural district and provincial hospitals, and community based targeted screening for TB (Tas4TB). The team performed interviews and observations to collect data on the time taken by health care worker-patient pairs at every stage of the treatment pathway. The personnel's practical capacity and capacity cost rates were calculated on five cost domains. An MS Excel model calculated diagnostic and treatment costs. FINDINGS: Twenty-five stages were identified in the TB care pathway across all health facilities except for community targeted screening for TB. Considerable variations were observed among the facilities in how health care professionals performed client registration, taking of vital signs, treatment follow-up, dispensing medicines and processing samples. The average cost per patient for the entire DS-TB care was USD324 with diagnosis costing USD69 and treatment costing USD255. The average cost for diagnosis and treatment was higher in clinics than in hospitals (USD392 versus USD256). Nurses in clinics were 1.6 time more expensive than in hospitals. The main cost components were personnel (USD130) and laboratory (USD119). Diagnostic cost in Tas4TB was twice that of health facility setting (USD153 vs USD69), with major cost drivers being demand creation (USD89) and sputum specimen transportation (USD5 vs USD3). CONCLUSION: TDABC is a feasible and effective costing and management tool in low-resource settings. The TDABC process maps and treatment costs revealed several opportunities for innovative improvements in the NTP under public health programme settings. Re-engineering laboratory testing processes and synchronising TB treatment follow-up with antiretroviral treatments could produce better and more uniform TB treatments at significantly lower cost in Zimbabwe.


Asunto(s)
Costos de la Atención en Salud , Hospitales , Estudios de Factibilidad , Humanos , Factores de Tiempo , Zimbabwe/epidemiología
3.
Transfus Apher Sci ; 59(5): 102842, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32586771

RESUMEN

AIMS: To assess platelet crossmatch result by SPRCA and find its correlation with post-transfusion platelet count increment among adult hemato-oncology patients. METHODS: A prospective observational pilot study of 50 adult hematologic malignancy patients previously transfused, but not already known to be transfusion-refractory and without any nonimmune causes for inadequate response to platelet transfusion were included after obtaining informed consent. They were transfused one unit of ABO identical single donor platelet. Ten minutes to 1 -h post-transfusion CCI was calculated. CCI ≥ 7500 was considered as adequate response. Post-transfusion crossmatching by SPRCA was performed by using preserved platelet samples from donor units with the serum of the respective patient. Statistical analysis of the correlation between platelet crossmatch results and CCI was done. RESULTS: Out of 50 crossmatches, 78% (39/50) showed compatible and 22% (11/50) showed incompatible results. Among 39 compatible results, 87.2% (34/39) showed adequate CCI and 12.8% (5/39) showed inadequate CCI. Among 11 incompatible results, 18.2% had adequate CCI and 81.8% had inadequate CCI. The difference between the response in terms of CCI to compatible and incompatible crossmatches was found to be statistically significant (p < 0.05). Other variables like age, sex, number of previous transfusions and underlying clinical condition of the patient were not found to have any effect on the compatibility of crossmatch. CONCLUSIONS: Transfusion of crossmatched platelets to non-refractory, multiply transfused hematological malignancy patients without serious illness might provide a small benefit over transfusing randomly selected platelets, though these data must be confirmed with a larger sample size.


Asunto(s)
Tipificación y Pruebas Cruzadas Sanguíneas/métodos , Neoplasias Hematológicas/sangre , Recuento de Plaquetas/métodos , Transfusión de Plaquetas/métodos , Adolescente , Adulto , Anciano , Femenino , Neoplasias Hematológicas/patología , Humanos , India , Masculino , Persona de Mediana Edad , Proyectos Piloto , Estudios Prospectivos , Atención Terciaria de Salud , Adulto Joven
4.
J Appl Microbiol ; 122(2): 493-505, 2017 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-27860045

RESUMEN

AIMS: To evaluate the comparative immunogenic potential of food grade Lactococcus lactis expressing outer membrane protein A (OmpA) of Shigella dysenteriae type-1 (SD-1) when administered either orally or intranasally. METHODS AND RESULTS: OmpA of SD-1 was cloned and expressed first in Escherichia coli and then in L. lactis. Presence of recombinant gene was confirmed by restriction enzyme digestion and immunoblot analysis. Using immobilized metal affinity chromatography, OmpA was purified from recombinant E. coliBL21 (DE3) and subcutaneously administered in BALB/c mice. Detection of OmpA-specific IgG antibodies by enzyme-linked immunosorbent assay (ELISA) confirmed the immunogenicity of OmpA. In order to establish r-L. lactis as a mucosal delivery vehicle, it was administered orally and nasally in BALB/c mice. Serum IgG and faecal IgA were assessed through ELISA to compare the relative potential of immunization routes and immunogenic potential of r-L. lactis. Immunization via the oral route proved superior to intranasal exposure. CONCLUSION: Recombinant L. lactis expressing OmpA of SD-1 was found to be immunogenic. Oral administration of r-L. lactis elicited higher systemic and mucosal immune response when compared with the nasal route. SIGNIFICANCE AND IMPACT OF THE STUDY: Using food grade recombinant L. lactis has implications in the development of a prophylactic against multidrug-resistant Shigella, which can be used as a prospective vaccine candidate. Evaluating mucosal routes of immunization demonstrated that the oral route of administration elicited better immune response against OmpA of Shigella.


Asunto(s)
Proteínas de la Membrana Bacteriana Externa/administración & dosificación , Proteínas de la Membrana Bacteriana Externa/inmunología , Inmunidad Mucosa , Lactococcus lactis/genética , Vacunas contra la Shigella/administración & dosificación , Vacunas contra la Shigella/inmunología , Shigella dysenteriae/inmunología , Administración Intranasal , Administración Oral , Animales , Proteínas de la Membrana Bacteriana Externa/química , Epítopos , Femenino , Inmunoglobulina G/sangre , Ratones , Ratones Endogámicos BALB C , Proteínas Recombinantes/administración & dosificación , Proteínas Recombinantes/química , Proteínas Recombinantes/inmunología , Vacunas contra la Shigella/química , Organismos Libres de Patógenos Específicos
5.
Transfus Med ; 27(4): 300-302, 2017 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-28401611

RESUMEN

OBJECTIVE: To determine if pegylated bovine carboxyhaemoglobin can be utilised in a thrombotic thrombocytopenic purpura (TTP) patient. BACKGROUND: TTP is a condition characterized by thrombotic microangiopathy and has a high mortality rate when left untreated. Therapeutic plasma exchange is well established as the most effective and evidence-based treatment of TTP. METHODS: The ability to administer plasma exchange therapy is limited in Jehovah's Witnesses who decline blood products due to religious beliefs. Pegylated bovine carboxyhaemoglobin is a novel oxygen transfer agent in development for the management of complications of ischaemia due to acute anaemia. RESULTS: Treatment was well tolerated, with grade 1 paresthesia of the right face and arm 1 h after the first infusion of Sanguinate, which spontaneously resolved and did not recur, and grade 1 cardiac troponin elevation after receiving the medication (with peak at 0·079 ng mL-1 ), but further workup with electrocardiogram and echocardiogram was unremarkable. By discharge on day 19, the patient's haemoglobin increased to 8·8 g dL-1 and platelet count to 221 000. CONCLUSIONS: We report the first case of TTP in a Jehovah's Witness that was successfully managed with the use of pegylated bovine carboxyhaemoglobin as an adjunct medication.


Asunto(s)
Sustitutos Sanguíneos/administración & dosificación , Carboxihemoglobina/administración & dosificación , Testigos de Jehová , Intercambio Plasmático , Púrpura Trombocitopénica Trombótica/terapia , Adulto , Animales , Bovinos , Femenino , Humanos
6.
Int J Clin Pract ; 68(7): 900-18, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24698515

RESUMEN

OBJECTIVE: To estimate the relative efficacy of pharmacological therapies for the treatment of postherpetic neuralgia (PHN), multiple sclerosis (MS)-related pain, posttraumatic pain, central poststroke pain (CPSP) and human immunodeficiency virus (HIV)-related neuropathic pain (NeP). METHODS: This systematic review (through June 2011) identified randomised, controlled trials of treatments for these conditions. Bayesian mixed treatment comparison (MTC) methods were used to determine the relative efficacy and safety among the treatments within each pain condition. RESULTS: Fifty studies were identified: 33 PHN, 2 MS-related pain, 3 CPSP, 3 posttraumatic pain and 9 HIV-related NeP. Data from 28 PHN studies including 21 interventions and 4317 patients were included into the PHN MTC. Of treatments studied in ≥ 50 patients, opioids had the greatest mean pain reduction of -1.70 vs. placebo on an 11-point numeric rating scale. Pregabalin ≥ 300 mg/day was most effective for ≥ 30% and ≥ 50% pain reduction [relative risk (RR) vs. placebo = 2.44 and 2.13, respectively]. Data identified for MS-related pain, CPSP, posttraumatic pain and HIV-related NeP were sparse; only 7 of 17 studies had ≥ 50 patients. Adverse events (AEs) and discontinuations for most treatments were not significantly greater than placebo except in PHN, where 8 of 12 treatments had higher risks of AEs compared with placebo and tricyclic antidepressants and opioids had higher risk of discontinuation compared with placebo. CONCLUSIONS: Guideline-recommended treatments for PHN were more effective than placebo on the pain NRS and for ≥ 30% and ≥ 50% pain reduction. Although guidelines exist for the management of less common NeP conditions, little published evidence supports them. These results highlight the need for additional evaluations and more complete reporting of outcomes to help guide physicians' treatment selections.


Asunto(s)
Esclerosis Múltiple/tratamiento farmacológico , Neuralgia Posherpética/tratamiento farmacológico , Neuralgia/tratamiento farmacológico , Dolor/tratamiento farmacológico , Accidente Cerebrovascular/tratamiento farmacológico , Resultado del Tratamiento , Heridas y Lesiones/tratamiento farmacológico , Humanos , Esclerosis Múltiple/complicaciones , Neuralgia/complicaciones , Neuralgia Posherpética/complicaciones , Accidente Cerebrovascular/complicaciones , Heridas y Lesiones/complicaciones
7.
Child Care Health Dev ; 40(4): 553-61, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-23551299

RESUMEN

BACKGROUND: Children living with complex heart defects (CHD) are likely to have ongoing social, emotional, physical, and health concerns, and are in need of additional psychosocial support. Summer camps can provide therapeutic benefits. Little research exists regarding the value of shorter camping experiences from the perspectives of children with CHD. The aim of our study was to explore what children and adolescents with CHD considered meaningful when attending a therapeutic camping weekend in the company of peers with similar medical diagnoses. METHODS: Engaging a phenomenological approach we used participant generated photography and reflective semi-structured interviews to explore participants' lived experience and value derived from their weekend camping experiences. The study was completed with thirteen participants ranging in age from 9 to 16 years. Interviews were recorded and transcribed verbatim. Data were analysed using Van Manen's guidelines. RESULTS: Three themes reflecting the camp experiences were generated from the data. Meaningful experiences spanned three outcomes which had some overlapping influences: (i) Developing relationships and feeling accepted by peers and counsellors at camp; (ii) Enjoying and learning during the weekend; and (iii) Experiencing the natural and human-built therapeutic environmental features of camp. The camping programme features, inputs, and processes as identified by the participants in contributing to these outcomes are described. CONCLUSION: This qualitative study showed that children living with complex CHD valued the opportunity for participating in weekend camping experiences in the company of peers with similar heart defects. Findings contribute to a better understanding of what programme features and processes were considered meaningful. Given the scarcity of resources to devote to such social support activities, the findings may help professionals to plan effective interventions to maximize benefits during a shorter camping experience.


Asunto(s)
Conducta del Adolescente , Acampada , Conducta Infantil , Cardiopatías Congénitas/psicología , Relaciones Interpersonales , Apoyo Social , Adolescente , Conducta del Adolescente/psicología , Actitud Frente a la Salud , Acampada/psicología , Niño , Conducta Infantil/psicología , Femenino , Cardiopatías Congénitas/epidemiología , Humanos , Masculino , Grupo Paritario , Investigación Cualitativa , Autoimagen , Encuestas y Cuestionarios , Estados Unidos
8.
Eur J Orthop Surg Traumatol ; 23 Suppl 2: S299-302, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23412194

RESUMEN

We report the use of vancomycin laden antibiotic cement beads in a patient with calcaneal osteomyelitis who had prior acute kidney injury (AKI). The patient experienced non-oliguric renal failure after exposure to intravenous vancomycin and recovered well after antibiotic discontinuation and adequate hydration. We are not aware of any similar case report where vancomycin laden antibiotic cement has been used in a patient with AKI to vancomycin.


Asunto(s)
Lesión Renal Aguda/inducido químicamente , Antibacterianos/administración & dosificación , Cementos para Huesos , Naftalenos , Osteomielitis/tratamiento farmacológico , Polímeros , Vancomicina/administración & dosificación , Administración Intravenosa , Adulto , Antibacterianos/efectos adversos , Calcáneo , Desbridamiento , Femenino , Humanos , Vancomicina/efectos adversos
9.
Phys Eng Sci Med ; 46(1): 57-66, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36454430

RESUMEN

HyperArc™ is a stereotactic radiotherapy modality designed for targeting multiple brain metastases using a single isocenter with multiple non-coplanar arcs. This study aimed to assess the efficacy of two patient-specific quality assurance methods, film and the Varian Portal Dosimetry System with Varian's HyperArc™ technique and raise important considerations in the customisation of patient-specific quality assurance to accommodate HyperArc™ delivery. Assessment criteria included gamma analysis and mean dose at full width half maximum. The minimum metastasis size, maximum off-axis distance and suitable energy were identified and validated. Patient-specific quality assurance procedures were applied to a range of clinically relevant brain metastasis plans. Initial investigation into energy selection showed no significant differences in gamma pass rates using 6MV, 6MV FFF, or 10MV FFF for metastasis sizes greater than 15 mm diameter at the isocenter. Gamma pass rates (2%/2mm) for 15 mm metastases at the isocenter for all energies were greater than 96.0% for portal dosimetry and greater than 98.7% for film. Fields of size 15 mm placed at various distances (10-70 mm) from the isocenter resulted in a maximum mean dose difference of 1.5% between film and planned. Clinically relevant plans resulted in a maximum mean dose difference for selected metastases of 1.0% between film and plan and a maximum point dose difference of 2.9% between portal dose and plan. Portal dose image prediction was a quick and convenient quality assurance tool for metastases larger than 15 mm near the isocenter but provided diminished geometrical relevance for off-axis metastases. Film QA required exacting procedures but offered the ability to assess the accuracy of geometrical targeting for off-axis metastases and provided dosimetric accuracy for metastases to well below 15 mm diameter.


Asunto(s)
Neoplasias Encefálicas , Radiocirugia , Radioterapia de Intensidad Modulada , Humanos , Dosificación Radioterapéutica , Radioterapia de Intensidad Modulada/métodos , Radiometría , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/secundario
10.
J Forensic Odontostomatol ; 41(1): 57-64, 2023 Apr 30.
Artículo en Inglés | MEDLINE | ID: mdl-37149754

RESUMEN

Geometric morphometrics is a novel statistical shape based technique used as an additional approach to the currently used methods in forensics for the assessment of age. Various craniofacial units are used for the estimation of age using this technique. The aim of this systematic review was to assess if Geometric Morphometrics is an accurate and reliable method in craniofacial skeletal age estimation. A literature search was conducted for cross-sectional studies on geometric morphometrics in craniofacial skeletal age estimation using various search engines such as Pubmed, Google Scholar, and Scopus using specific MESH terms. AQUA (Anatomical Quality Assessment) tool was used for the quality assessment. A total of 4 articles were included for qualitative synthesis as they met the objectives of this review. The results of all the included studies suggested that geometric morphometrics can be used for craniofacial skeletal age estimation. The centroid size calculated using digitized images or CBCT scanned images is said to be the highest predictor of age.This systematic review summarises the merits and demerits of this technique and suggests that it is rapid and accurate method for age estimation even in instances of single skeletal remains of craniofacial units and can be performed on a digitized image or a CBCT scanned images. However, further studies are needed to derive reliable data and meta-analysis can be performed effectively.


Asunto(s)
Determinación de la Edad por el Esqueleto , Huesos , Humanos , Determinación de la Edad por el Esqueleto/métodos , Restos Mortales , Estudios Transversales
11.
J Clin Microbiol ; 50(9): 3031-9, 2012 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-22785185

RESUMEN

Cronobacter (previously known as Enterobacter sakazakii) is a diverse bacterial genus consisting of seven species: C. sakazakii, C. malonaticus, C. turicensis, C. universalis, C. muytjensii, C. dublinensis, and C. condimenti. In this study, we have used a multilocus sequence typing (MLST) approach employing the alleles of 7 genes (atpD, fusA, glnS, gltB, gyrB, infB, and ppsA; total length, 3,036 bp) to investigate the phylogenetic relationship of 325 Cronobacter species isolates. Strains were chosen on the basis of their species, geographic and temporal distribution, source, and clinical outcome. The earliest strain was isolated from milk powder in 1950, and the earliest clinical strain was isolated in 1953. The existence of seven species was supported by MLST. Intraspecific variation ranged from low diversity in C. sakazakii to extensive diversity within some species, such as C. muytjensii and C. dublinensis, including evidence of gene conversion between species. The predominant species from clinical sources was found to be C. sakazakii. C. sakazakii sequence type 4 (ST4) was the predominant sequence type of cerebral spinal fluid isolates from cases of meningitis.


Asunto(s)
Cronobacter/clasificación , Cronobacter/genética , Tipificación de Secuencias Multilocus/métodos , Filogenia , Proteínas Bacterianas/genética , Análisis por Conglomerados , Cronobacter/aislamiento & purificación , Variación Genética , Infecciones por Bacterias Gramnegativas/microbiología , Humanos , Homología de Secuencia de Ácido Nucleico
12.
Nat Mater ; 10(1): 39-44, 2011 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-21131962

RESUMEN

Spintronics has shown a remarkable and rapid development, for example from the initial discovery of giant magnetoresistance in spin valves to their ubiquity in hard-disk read heads in a relatively short time. However, the ability to fully harness electron spin as another degree of freedom in semiconductor devices has been slower to take off. One future avenue that may expand the spintronic technology base is to take advantage of the flexibility intrinsic to organic semiconductors (OSCs), where it is possible to engineer and control their electronic properties and tailor them to obtain new device concepts. Here we show that we can control the spin polarization of extracted charge carriers from an OSC by the inclusion of a thin interfacial layer of polar material. The electric dipole moment brought about by this layer shifts the OSC highest occupied molecular orbital with respect to the Fermi energy of the ferromagnetic contact. This approach allows us full control of the spin band appropriate for charge-carrier extraction, opening up new spintronic device concepts for future exploitation.

13.
Transpl Infect Dis ; 13(2): 174-7, 2011 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-20946204

RESUMEN

Disseminated adenoviral infection is a serious problem, especially in an immunocompromised host. The disease carries a mortality rate reaching as high as 80%. It is seen most frequently in bone marrow transplant recipients, where it causes pneumonia and disseminated disease. In solid organ transplant recipients it causes graft infection. We report the case of a renal transplant recipient with disseminated adenoviral infection and acute kidney failure requiring dialysis. Reduction of immunosuppression and 1 dose of cidofovir were associated with resolution of viremia and viruria and return of kidney function to near baseline.


Asunto(s)
Infecciones por Adenovirus Humanos/etiología , Enfermedades Renales/virología , Trasplante de Riñón/efectos adversos , Nefritis/virología , Infecciones por Adenovirus Humanos/tratamiento farmacológico , Infecciones por Adenovirus Humanos/patología , Infecciones por Adenovirus Humanos/virología , Anciano , Antivirales/uso terapéutico , Cidofovir , Citosina/análogos & derivados , Citosina/uso terapéutico , Femenino , Humanos , Riñón/patología , Enfermedades Renales/tratamiento farmacológico , Enfermedades Renales/etiología , Enfermedades Renales/patología , Nefritis/etiología , Organofosfonatos/uso terapéutico , Factores de Tiempo
14.
Eur Rev Med Pharmacol Sci ; 15(1): 9-14, 2011 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-21381495

RESUMEN

Expedited research on Obesity has confirmed that, adipose tissue is highly active in secreting a variety of proteins, one among them is visfatin. It was originally identified as Pre B cell Colony Enhancing Factor (PBEF), to be secreted by the lymphocytes and can act as a cytokine with immune regulatory action. Besides, it acts as Nicotinamide phosphoribosyl transferase (Nampt), an enzyme involved in the NAD+ salvage pathway. It has been shown to help in the regulation of glucose homeostasis, but whether it binds to insulin receptor and exerts insulin mimetic activity is still a controversy. Visfatin has antiapoptotic activity and has a regulatory role in inflammation. Several studies have identified changes in the circulatory levels of visfatin in diseases. Notable among them are obesity, diabetes mellitus, kidney diseases and bone disorders. It is a molecule of clinical relevance and could be a promising biomarker with diagnostic and prognostic significance.


Asunto(s)
Nicotinamida Fosforribosiltransferasa/fisiología , Animales , Apoptosis , Índice de Masa Corporal , Huesos/metabolismo , Humanos , Nicotinamida Fosforribosiltransferasa/sangre , Nicotinamida Fosforribosiltransferasa/química , Obesidad/sangre
15.
Nat Mater ; 8(2): 109-14, 2009 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-19029892

RESUMEN

Electronic devices that use the spin degree of freedom hold unique prospects for future technology. The performance of these 'spintronic' devices relies heavily on the efficient transfer of spin polarization across different layers and interfaces. This complex transfer process depends on individual material properties and also, most importantly, on the structural and electronic properties of the interfaces between the different materials and defects that are common to real devices. Knowledge of these factors is especially important for the relatively new field of organic spintronics, where there is a severe lack of suitable experimental techniques that can yield depth-resolved information about the spin polarization of charge carriers within buried layers of real devices. Here, we present a new depth-resolved technique for measuring the spin polarization of current-injected electrons in an organic spin valve and find the temperature dependence of the measured spin diffusion length is correlated with the device magnetoresistance.

16.
J Postgrad Med ; 56(4): 287-9, 2010.
Artículo en Inglés | MEDLINE | ID: mdl-20935401

RESUMEN

The development of biliary casts is very rare, especially in non-liver transplant patients. The etiology of these casts is uncertain but several factors have been proposed which lead to bile stasis and/or gallbladder hypo-contractility and promote cast formation. Here, we report a 54-year-old male, with diabetes and ischemic heart disease, who presented with recurrent attacks of cholangitis. Magnetic resonance cholangiopancreatography revealed linear T1 hyperintense and T2 hypointense filling defects in the right and left hepatic ducts extending into the common hepatic duct, and a calculus in the lower common bile duct, raising a suspicion of worm in the biliary tree. In view of failed attempts at extraction on endoscopy, patient underwent surgery. At exploration, biliary casts and stones were extracted from the proximal and the second order bile ducts, with the help of intraoperative choledochoscopy and a bilio-enteric anastomosis was accomplished. Although endoscopic retrieval of the biliary cast can be employed as first-line management, surgery should be considered in case it fails.


Asunto(s)
Enfermedades de los Conductos Biliares/cirugía , Colangiopancreatografia Retrógrada Endoscópica/efectos adversos , Colangitis/cirugía , Enfermedades de los Conductos Biliares/diagnóstico por imagen , Enfermedades de los Conductos Biliares/etiología , Colangitis/diagnóstico por imagen , Colangitis/etiología , Humanos , Masculino , Persona de Mediana Edad , Resultado del Tratamiento
17.
Trop Biomed ; 37(4): 1050-1061, 2020 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-33612757

RESUMEN

OBJECTIVE: To evaluate the sensitivity and the stability of the monoclonal antibodies (Aa3c10, b10c1), against truncated Histidine-rich protein 2 (PfHRP2), developed using smart polymer, poly N-isopropylacrylamide, as adjuvant for malarial diagnostic applications in comparison with the available commercial antibodies. METHODS: Two hybridoma clones (Aa3c10, b10c1) were used for the production of ascites in BALB/c mice. Purification of monoclonal antibodies from the ascites was carried out using affinity columns. The thermal stability study of monoclonal antibodies was done by storing it at 37°C and 45°C for thirty days. The stored antibodies were analyzed using SDS-PAGE and flow-through device where the antigenantibody interaction was visualized by Protein A colloidal gold solution. Sensitivity was determined by endpoint dilution ELISA and the dissociation constant by competitive ELISA. Sensitive pair optimization was done by sandwich ELISA using biotinylated antibodies. Prototype preparation for lateral flow assay had a colloidal gold-based detection system. RESULTS: Thermal stability experiments showed that both mAbs (Aa3c10; b10c1) are stable up to thirty days at 45°C while the commercially available mAbs were stable up to fifteen days only. Compared to commercial antibodies, the mAb Aa3c10, showed the highest sensitivity in end-point titre. In sensitive pair optimization, it was observed that the mAb, b10c1, as a detector and the mAb, Aa3c10, as a capture antibody showed the highest absorbance to detect 50pg/ml PfHRP2 antigen. The prototype formulation of lateral flow assay using the mAbs (Aa3c10; b10c1) showed good reactivity with WHO panel and no false-positive results were observed with twenty clinically negative samples and five P. vivax positive samples. CONCLUSIONS: The novel monoclonal antibodies (Aa3c10, b10c1) against truncated PfHRP2, could be a strong potential candidates that can be included in making RDTs with better sensitivity and stability.


Asunto(s)
Anticuerpos Monoclonales/inmunología , Anticuerpos Antiprotozoarios/inmunología , Antígenos de Protozoos/inmunología , Malaria Falciparum/diagnóstico , Proteínas Protozoarias/inmunología , Acrilamidas , Animales , Especificidad de Anticuerpos , Ensayo de Inmunoadsorción Enzimática , Femenino , Malaria Falciparum/inmunología , Ratones Endogámicos BALB C , Estabilidad Proteica
18.
J Neonatal Perinatal Med ; 13(2): 247-251, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31796688

RESUMEN

BACKGROUND: Healthcare spending is expected to grow faster than the economy over the next decade, and the cost of prematurity increases annually. The aim of this study was to investigate the frequency of intervention after routine laboratory testing in preterm infants. METHODS: This was a retrospective study of preterm infants (≤34 weeks) admitted to the NYU Langone Health NICU from June 2013 to December 2014. Data collected included demographics, results of laboratory tests, and resulting interventions. Intervention after a hemogram was defined as a blood transfusion. Intervention after a hepatic panel was defined as initiation or termination of ursodiol or change in dose of vitamin D. Subjects were stratified into 3 groups based on gestation (<28 weeks, 28-31 6/7 weeks, 32-34 weeks). Chi-square analysis was used to compare the frequency of intervention between the groups. RESULTS: A total of 135 subjects were included in the study. The frequency of intervention after a hemogram was 8.4% in infants <28 weeks, 4.6% in infants 28-31 6/7 weeks, and 0% in infants 32-34 weeks; this difference was found to be statistically significant (p = 0.02). The frequency of intervention after a hepatic panel was 4.2% in infants <28 weeks, 5.7% in infants 28-31 6/7 weeks, and 0% in infants 32-34 weeks, which was not found to be a statistically significant different. CONCLUSION: No interventions were undertaken post-routine laboratory testing in any infant 32-34 weeks and routine testing in this population may be unnecessary. Further studies are needed to elucidate if routine testing affects neonatal outcomes.


Asunto(s)
Anemia/diagnóstico , Conservadores de la Densidad Ósea/administración & dosificación , Enfermedades Óseas Metabólicas/diagnóstico , Colagogos y Coleréticos/uso terapéutico , Colestasis/diagnóstico , Pruebas Diagnósticas de Rutina/métodos , Fosfatasa Alcalina/sangre , Anemia/sangre , Anemia/terapia , Bilirrubina/sangre , Enfermedades Óseas Metabólicas/sangre , Enfermedades Óseas Metabólicas/tratamiento farmacológico , Colestasis/sangre , Colestasis/tratamiento farmacológico , Colestasis/etiología , Pruebas Diagnósticas de Rutina/economía , Transfusión de Eritrocitos/estadística & datos numéricos , Femenino , Edad Gestacional , Costos de la Atención en Salud , Gastos en Salud , Hematócrito/economía , Hematócrito/métodos , Humanos , Recien Nacido Extremadamente Prematuro , Recién Nacido , Recien Nacido Prematuro , Unidades de Cuidado Intensivo Neonatal , Pruebas de Función Hepática/economía , Pruebas de Función Hepática/métodos , Masculino , Tamizaje Masivo/economía , Tamizaje Masivo/métodos , Nutrición Parenteral Total/efectos adversos , Selección de Paciente , Estudios Retrospectivos , Ácido Ursodesoxicólico/uso terapéutico , Vitamina D/administración & dosificación
19.
J Endourol ; 34(9): 939-945, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32600060

RESUMEN

Introduction: To compare short- and midterm outcomes of the first 55 patients undergoing robot-assisted kidney transplant (RAKT) with patients undergoing open kidney transplant (OKT) during the same period in a tertiary care hospital. Materials and Methods: Data of all end-stage renal disease patients undergoing renal transplant were prospectively maintained. All graft kidneys were harvested laparoscopically. Both RAKT and OKT were performed using standardized techniques, and all RAKTs were performed by a single experienced robotic surgeon. Chi-square test/Fisher exact test was done for categorical data, and Mann-Whitney U test was done for continuous data. Discrete variables were expressed in absolute numbers and percentages. For all tests, p < 0.05 was considered significant. All results were expressed as mean ± standard deviation or median with range. Results: Between April 2016 and September 2018, 55 patients underwent RAKT. The same was compared with 152 patients who underwent OKT. The two groups were comparable in terms of age, gender, and body mass index. Duration on hemodialysis was significantly higher in the RAKT group, and hemoglobin and donor kidney glomerular filtration rate was significantly better in the RAKT group. Requirement of perioperative analgesia was significantly less in the RAKT group. Rewarm ischemia time was significantly longer in the RAKT group. The fall in serum creatinine was slower in RAKT group till 3 months. The serum creatinine levels were statistically similar in the two cohorts at 3 months (p = 0.082), which was maintained at median 29 months of follow-up (p = 0.067). Tacrolimus levels on postoperative day 2 were found to be significantly higher in RAKT cohort (17.98 ± 14.41) vs OKT cohort (11.38 ± 6.93). Surgical-site infections were rare in the RAKT group. Conclusions: RAKT confers advantage of decreased wound morbidity with similar functional outcomes compared with OKT in midterm. It looks promising; however, long-term follow-up of larger numbers of patients is needed.


Asunto(s)
Trasplante de Riñón , Procedimientos Quirúrgicos Robotizados , Robótica , Humanos , Tempo Operativo , Estudios Prospectivos , Resultado del Tratamiento
20.
J Nanosci Nanotechnol ; 8(8): 4258-62, 2008 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-19049214

RESUMEN

Barium stannate nanorods have been synthesized using chloride precursors, which were activated to form composite complexes and subjected to hydrothermal treatment in a teflon lined reactor. The reaction time was varied between 0.5 to 6.0 h. The reaction conditions included alkaline pH, pressure of 75 kg/cm2 and temperature below 200 degrees C. The sample powders were further calcined at 200, 400 and 600 degrees C for 4 h each. The phase formation was confirmed by IR and XRD. The cubic phase of BaSnO3 powder obtained at 600 degrees C was observed under electron microscope and revealed the formation of long rods of length 2-5 microm with a diameter of 50-60 nm. The use of TMAOH as a mineralizer resulted in the formation of shorter and finer nanofibres. The nanorods were sonicated in presence of auric chloride solution in alkaline medium and the formation of Au-BaSnO3 composite powder was confirmed by UV-visible spectroscopy and X-ray diffraction technique.

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