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1.
Int J Biometeorol ; 67(12): 1941-1955, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-37710026

RESUMEN

Shading strategies are effective means to reduce urban risk factors such as the Urban Heat Island (UHI) effect. The influence of shaded outdoor spaces on university students' thermal adaptability and cognitive performance is limited researched. The study aims at evaluating the effect of shaded outdoor spaces upon thermal comfort; and, linking such results upon university students' cognitive performance in a classroom environment with natural ventilation. A case study was conducted with students the ages of 19-22 at Bilkent University in Ankara, during the mid-season in October.The quantitative microclimatic conditions of the university campus's unshaded/shaded areas and indoor studios were obtained through Physiologically Equivalent Temperature (PET) index. The qualitative evaluation was undertaken by the adaptive model and thermal comfort survey. D2 test of attention was conducted to measure cognitive performance of students.This study revealed that the shade may increase thermal adaptation with the lowest mean PET of 18.7°C, while the highest mean PET of 33.2°C was obtained in sun-exposed space. Also, experiencing shaded outdoor space contributed to an improvement in concentration performance (CP) of students resulting in the mean CP score of 182.8, while those with sun-exposed outdoor space experience had the mean CP score of 167.6 within studios.


Asunto(s)
Calor , Sensación Térmica , Humanos , Ciudades , Universidades , Temperatura , Fiebre , Estudiantes , Cognición
2.
Data Brief ; 42: 108292, 2022 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-35647233

RESUMEN

Here we provide Urban Heat Island (UHI) by local weather types (LWT) maps for the Lisbon Metropolitan Area (LMA). These maps were produced from the Copernicus Land Monitoring Service climate variables dataset that contains hourly air temperature raster data for 100 European cities (2008-2017), namely Lisbon and part of its metropolitan area. Over 61000 maps (2008-2014) were extracted in NetCDF format and processed in geographic-information-systems (GIS). An urban mask was created from the recently updated Local Climate Zones (LCZ) classification for this area and a cell of the LCZ class "Low Plants" (non-urban) was chosen to calculate the temperature difference. UHI intensity was estimated using an R script. The outputs of this process were divided by thermal seasons and LWT. Ultimately, average UHI intensity by LWT was estimated. Average UHI according to meteorological conditions is available in GeoTIFF raster format (Appendix 1), with a spatial resolution of 100 × 100m pixels, as well as hourly average UHI for each LWT (Appendix 2 to 16). This data may provide valuable information for urban planners, designers and architects in the process of pinpointing recurrent hot and cool spots/neighborhoods in the city and its heating/cooling degrees. Moreover, these maps may contribute to a construction of an early warning system that anticipates which weather conditions we might expect an significant increase in thermal discomfort on those critical areas in the city.

3.
BMC Nurs ; 20(1): 247, 2021 Dec 09.
Artículo en Inglés | MEDLINE | ID: mdl-34879843

RESUMEN

BACKGROUND: The safe and standard handling of antineoplastic drugs can reduce the effects of occupational exposure and promote safe behaviors in nurses. Thus, the present study aimed to determine the effects ofstandard guidelines education on the safe handling of antineoplastic drugs among oncologynurses in Ardabil, Iran. METHODS: Thequasi-experimental study with a one-group pretest-posttest design was performed among 32 nursesworking in the oncology wards of two educational hospitals in Ardabil city, during 2020. Allthe nurses in the wards who met the inclusion criteria participated in the study. The data were collectedby usinga demographic information form and nurses'knowledge assessment questionnaire regardingthe standard guidelines for working with antineoplastic drugs, and a standard checklist for examiningtheir performance in this regard. Subsequently, they were analyzed by descriptive (mean and standard deviation) and inferential statistics (t-test)and Pearson's correlation coefficient) in SPSS 22. RESULTS: The mean and standard deviation of the knowledge and performance scores of the oncology nurses was59.56±6.41and 18.96±2.54 respectively, which changed to 66±4.82 and 32.03±2.45 respectively three months after training. The results of the t-test represented a statistically significant difference between the level of knowledge and performance before and after the intervention (P=0.001). CONCLUSIONS: Based on the results, the standard guidelines education improved the nurses' knowledge and performance on the safe handling of antineoplastic drugs in the chemotherapy wards. Therefore, it is advised to increase the awareness of the oncology nurses in this regard in the planning and policy-making ofhealthcare centers.

4.
Arch Razi Inst ; 76(4): 1047-1053, 2021 10.
Artículo en Inglés | MEDLINE | ID: mdl-35096340

RESUMEN

Avibacterium (Haemophilus) Paragallinarum (Av. Paragallinarum) is the causative agent of Infectious Coryza (IC) in chickens. Despite the worldwide distribution of IC, no systematic study, to the best of our knowledge, was conducted on isolation and characterization of Av. Paragallinarum in Iran. The present study aimed to isolate and perform antibacterial susceptibility testing (AST) of IC agents from suspected backyard chickens with typical symptoms of IC in avian markets. From 18 collected choanal swab samples, four (22%) isolates of Av. Paragallinarum were detected by culture methods based on satellite growth on blood agar, which was confirmed by the biochemical reaction of Catalase and Oxidase tests and species-specific PCR (HPG-2). The hypervariable region of the hemagglutinin genes of 4 isolates was amplified and obtained sequences were deposited at a gene bank for more characterization. Meanwhile, 12 (66%) positive reactions were detected by observing expected 500 bpb and using PCR (HPG-2) on swab samples. Antibiotic susceptibility testing (AST) of obtained isolates were analyzed using the Kirby-Bauer disk diffusion method on Columbia agar with horse blood. Isolates were found to be resistant to amoxicillin, oxytetracycline, streptomycin, trimethoprim/sulfamethoxazole (up to 75%) and sensitive to cefalexin, ceftriaxone, enrofloxacin, florfenicol, gentamycin, linco-spectin, neomycin, doxycycline (50%), danofloxacin (75%), flumequine (50%), ofloxacin (75%). An intermediate growth inhibitionzone has been observed around antibiotic discs for ampicillin, colistin, erythromycin, penicillin, tiamulin (75%), tylosin (75%). In summary, to the best of our knowledge, this study is the first report of isolation and identification of AvibacteriumParagallinarum from backyard chickens which may be a source of IC for commercial chicken flocks. Moreover, the prevalence of resistance to some antibacterial drugs of IC agents may impose an additional threat to the poultry industry. A more in-depth study is recommended to develop a low-cost autogenous IC vaccine for small-scale flocks of poultry to prevent and manage the disease and establish antimicrobial resistance.


Asunto(s)
Infecciones por Haemophilus , Enfermedades de los Caballos , Enfermedades de las Aves de Corral , Animales , Antibacterianos/farmacología , Pollos , Ciudades , Infecciones por Haemophilus/epidemiología , Infecciones por Haemophilus/microbiología , Infecciones por Haemophilus/veterinaria , Caballos , Irán/epidemiología , Enfermedades de las Aves de Corral/microbiología
5.
Theor Appl Climatol ; 143(1-2): 533-555, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33132470

RESUMEN

The disclosed study undertook a 'human centred-approach' that ascertained and categorised environmental human thermophysiological risk factors by relating them to the human biometeorological system through the use of three widely utilised energy balance model (EBM) indices, the physiologically equivalent temperature (PET), the modified PET, and the universal thermal climate index (UTCI). The disclosed assessment was carried out over the past decade (i.e., 2010-2019) with a 3-h temporal resolution for the case of Ankara through two WMO meteorological stations to compare both local urban and peri-urban environmental conditions. The study recognised extreme annual variability of human physiological stress (PS) during the different seasons as a result of the biometeorological processing of the singular variables, which in the case of average PET for both stations, varied by up to 75 °C between the winter and summer for the same annual dataset (2012). In addition, all EBMs indicated higher heat stress within the city centre that were conducive of both urban extreme heatwaves and very hot days during the summer months, with extreme heat stress levels lasting for longer than a week with PET values reaching a maximum of 48 °C. Similar cold extremes were found for the winter months, with PET values reaching - 30 °C, and average PS levels varying lower in the case of the peri-urban station. Graphical abstract.

6.
Comput Med Imaging Graph ; 84: 101751, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32679470

RESUMEN

An aneurysm is a vascular disorder where ballooning may form in a weakened section of the wall in the blood vessel. The swelling of the aneurysm may lead to its rupture. Intra-cranial aneurysms are the ones presenting the higher risks. If ruptured, the aneurysm may induce a subarachnoid haemorrhage which could lead to premature death or permanent disability. In this study, we are interested in locating and characterizing the bifurcations of the cerebral vascular tree. We use a 3D skeletonization combined with a graph-based approach to detect the bifurcations. In this work, we thus propose a full geometric characterisation of the bifurcations and related arteries. Aside from any genetic predisposition and environmental risk factors, the geometry of the brain vasculature may influence the chance of aneurysm formation. Among the main achievements, in this paper, we propose accurate, predictive 3D measurements of the bifurcations and we furthermore estimate the risk of occurrence of an aneurysm on a given bifurcation.


Asunto(s)
Aneurisma Intracraneal , Hemorragia Subaracnoidea , Humanos , Aneurisma Intracraneal/diagnóstico por imagen , Angiografía por Resonancia Magnética
7.
Arch Razi Inst ; 75(1): 17-22, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-32291998

RESUMEN

Avian influenza viruses (AIV) affect a wide range of birds and mammals, cause severe economic damage to the poultry industry, and pose a serious threat to humans. Highly pathogenic avian influenza viruses (HPAI) H5N1 were first identified in Southeast Asia in 1996 and spread to four continents over the following years. The viruses have caused high mortality in chickens and various bird species and deadly infections in humans. Multiple conventional methods have been so far introduced for the detection and identification of avian influenza viruses. Traditional virus isolation methods are gold standard protocol in AI detection; nonetheless, virus isolation in embryonating chicken eggs (ECE) is not a rapid method for the detection of influenza viruses since it is time-consuming and labor-intensive. Furthermore, the isolation of highly pathogenic viruses, such as H5, needs BSL3 laboratories. Real-Time Reverse Transcription-Polymerase Chain Reaction (RRT-PCR) is a sensitive and specific method for the detection of influenza viruses. The application of these nucleic acid-based techniques has increased our ability to identify and perform influenza virus care programs, especially in surveillance programs. The current study aimed to detect H5 subtype of avian influenza (AI) virus using fast, specific, and sensitive TaqMan RRT-PCR. Notably, single step RRT-PCR was used to prevent possible laboratory contamination. The specificity of this test was evaluated using nucleic acid extracted from several poultry pathogenic microorganisms and negative clinical specimens from AI-uninfected birds. The sensitivity analysis of the RRT-PCR assay was performed using in vitro-transcribed RNA copy and 10-fold serial dilution of standard AI virus with specific titer. The results indicated the high sensitivity of this method and the lowest detectable dilution of this method based on RNA copies and 1:10 serial dilutions of the standard virus was 10 1.9 EID50 /100.


Asunto(s)
Pollos , Virus de la Influenza A/aislamiento & purificación , Gripe Aviar/diagnóstico , Enfermedades de las Aves de Corral/diagnóstico , Reacción en Cadena en Tiempo Real de la Polimerasa/veterinaria , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa/veterinaria , Animales , Subtipo H5N1 del Virus de la Influenza A/aislamiento & purificación , Subtipo H5N2 del Virus de la Influenza A/aislamiento & purificación , Subtipo H5N8 del Virus de la Influenza A/aislamiento & purificación , Gripe Aviar/virología , Óvulo/virología , Enfermedades de las Aves de Corral/virología , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa/métodos , Sensibilidad y Especificidad
8.
Perspect Public Health ; 140(1): 62-66, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31165671

RESUMEN

AIMS: This article examines the outputs of pharmaceutical education with the development of the pharmacy profession and how that affects pharmaceutical innovation. It also discusses different models of collaboration between the academic and pharmaceutical industry in order to achieve a healthy collaboration between the stakeholders. METHODS: The perspective, experiences and insights of educators from various backgrounds, origin and educational levels were sought regarding the role of pharmacy education in providing pharmaceutical research and development workforce. RESULTS: Many countries around the world are currently undertaking major reforms in pharmacy education due to the changing landscape of health and healthcare delivery. These reforms must be accompanied by robust systems to assure that the quality of educational structures, processes and outcomes will produce competent pharmacy graduates in the future. It is also considered imperative that pharmacy academic institutions should establish collaboration with the drug development units, the pharmaceutical industry and government agencies for sustainability and positive research outcomes. CONCLUSION: Shortcomings in pharmacy curricula need to be addressed and the authors have proposed the 'TARGET' approach for the development of integrated pharmacy curriculum to substantially contribute to pharmaceutical research and development.


Asunto(s)
Educación en Farmacia/métodos , Investigación Farmacéutica/educación , Farmacéuticos , Competencia Profesional , Selección de Profesión , Conducta Cooperativa , Curriculum , Industria Farmacéutica , Reforma de la Atención de Salud , Humanos , Farmacéuticos/psicología , Universidades
9.
Acta Virol ; 63(2): 217-222, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31230451

RESUMEN

Avian avulavirus 1, better known as Newcastle disease virus (NDV), causes substantial loss to the poultry industry in many developing countries. In this study we have characterized and fully sequenced the genome of a velogenic NDV strain named Beh (Ck/IR/Beh/2011) that has been used in our lab for a number of challenge and immunological studies over the last few years. This strain was isolated from poultry in the city of Behshahr, Mazandaran Province, Iran after an outbreak reported in the region in 2011. The intracerebral pathogenicity index (ICPI) was 1.8 in one-day-old chicks, characteristic of a velogenic NDV strain. Later, the virus was purified using a sucrose gradient centrifugation and used for next-generation sequencing (NGS). The results showed that the genome length was 15192 bp, similar to those of class II velogenic strains. In addition, the phylogenetic analysis based on the complete F gene showed that the NDV strain Beh has an F protein cleavage site 112RRQKR↓ F117 and belongs to the newly identified subgenotype VII(L). Based on the biological and genetic characterization, NDV strain Beh is now the best documented reference isolate representing the novel subgenotype VII(L) in Iran. Keywords: NDV; NGS; velogenic strain, subgenotype VII(L); phylogenetic analysis.


Asunto(s)
Genoma Viral , Virus de la Enfermedad de Newcastle , Filogenia , Animales , Genoma Viral/genética , Genotipo , Irán , Enfermedad de Newcastle/virología , Virus de la Enfermedad de Newcastle/clasificación , Virus de la Enfermedad de Newcastle/genética
10.
Br Poult Sci ; 60(5): 530-538, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31124697

RESUMEN

This study was conducted to evaluate the effects of chitosan nano-encapsulating mint (MEO), thyme (TEO) and cinnamon (CEO) essential oils (EOs) used in the diet on performance, immune responses and intestinal bacteria population in broiler chickens. A total of 600 mixed-sex, 1-d-old Ross 308 broiler chicks were used in a 2 × 4 factorial experiment as completely randomised design with 8 experimental groups (diets) with 5 replicates of 15 chicks each (totally 40 pens). The eight experimental diets consisted of no EO and free distiller water (control); no EO and chitosan nano-encapsulated (CNE) distiller water; and other six treatments with free or CNE form of MEO, TEO and CEO (added at 0.025%, 0.04% and 0.055% respectively to starter, grower and finisher diets). Both EOs and the CNE form had significant (P < 0.05) benefits on improving body weight gain, and feed conversion ratio in periods of 29-42 and 1-42 days. The highest effect was (P < 0.05) obtained in birds receiving TEO, which was intensified by nano-encapsulation. Breast percentage was improved by nano-encapsulation (P < 0.05). The EOs (especially TEO and CEO) and CNE form improved (P < 0.05) serum IgY and IgM concentrations (at 35 and 42 days) and intestinal Lactobacillus spp. and E. coli populations (at 42 days) in broilers. Nano-encapsulated EOs, especially TEO and CEO had (P < 0.05) the largest effect on increasing IgY42 concentrations and the microbial populations. The tested EOs, especially TEO, improved more of the evaluated traits in broiler chickens. Also, Chitosan nano-encapsulation because of its ideal properties can be an effective, suitable and inexpensive method for protecting bioactive compounds and improving effects of the herbal EOs especially thyme in broiler chickens.


Asunto(s)
Pollos/microbiología , Pollos/fisiología , Microbioma Gastrointestinal/efectos de los fármacos , Nanopartículas/administración & dosificación , Aceites Volátiles/farmacología , Alimentación Animal/análisis , Animales , Pollos/crecimiento & desarrollo , Pollos/inmunología , Quitosano/química , Cinnamomum zeylanicum/química , Dieta/veterinaria , Suplementos Dietéticos/análisis , Femenino , Microbioma Gastrointestinal/fisiología , Masculino , Mentha piperita , Nanopartículas/química , Aceites de Plantas/administración & dosificación , Aceites de Plantas/metabolismo , Distribución Aleatoria , Thymus (Planta)/química
11.
Arch Razi Inst ; 73(3): 177-182, 2018 09.
Artículo en Inglés | MEDLINE | ID: mdl-30280837

RESUMEN

Avian influenza H9N2 subtype viruses have had a great impact on Iranian industrial poultry production economy since introduction in the country. To approach Rapid and precise identification of this viruses as control measures in poultry industry, a real time probe base assay was developed to directly detect a specific influenza virus of H9N2 subtype -instead of general detection of Influenza A viruses- which has been endemic over two last decades in the country. An Iranian avian influenza virus strain of A/Iran/chicken/772/1998 H9N2 subtype were selected as reference strain for of primers and probe designing. The high agreement value of 99% indicated that the devolved real time assay for detection of H9 subtype viruses could easily replace the conventional method of virus isolation particularly in investigation of viruses like national surveillance plan. The limit of detection was almost one EID50 which was the least real infectious unit could be detected. So it can be said that this sensitive assay provided a powerful tool to not to miss any significant viral biological activity neither in the host body nor in the environment. A high level of correlation coefficient (R2 = 0.998) also indicated a good correlation between Ct values and viral concentrations. , it can be conclude that the real time RT-PCR could be easily replace virus isolation in detection of H9N2 influenza viruses especially in large monitoring program. The ability in quantifying of the virus concentration extends usage of test in more accurate studies.


Asunto(s)
Pollos , Pruebas Diagnósticas de Rutina/veterinaria , Subtipo H9N2 del Virus de la Influenza A/aislamiento & purificación , Gripe Aviar/diagnóstico , Reacción en Cadena de la Polimerasa/veterinaria , Enfermedades de las Aves de Corral/diagnóstico , Animales , Embrión de Pollo , Pruebas Diagnósticas de Rutina/métodos , Gripe Aviar/virología , Irán , Reacción en Cadena de la Polimerasa/métodos , Enfermedades de las Aves de Corral/virología , Sensibilidad y Especificidad
12.
Gynecol Endocrinol ; 34(3): 243-247, 2018 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-28942697

RESUMEN

Ovarian masses requiring surgical intervention are uncommon in the pediatric population. Our aim is to report results of a multicentric Tunisian study concerning the clinical practice and the management of pediatric ovarian masses and to identify the factors that are associated with ovarian preservation. Between January 2000 and December 2015, 98 pediatric patients (<14 years) were surgically treated for ovarian masses at the five pediatric surgery departments in Tunisia. Ninety-eight patients were included in this study. The mean age of the patients at time of surgery was 8.46 ± 4.87 years. Sixty-three ovarian masses (64.3%) were non-neoplastic lesions, 24 (24.5%) were benign tumors, and 11 (11.2%) were malignant neoplasms. Conservative surgery (ovarian-preserving surgery) was successfully performed in 72.4% of the benign lesions, whereas only three patients (27.3%) with malignant tumors underwent ovary-sparing tumor resection (p < .001). The mean diameter of the tumors in the patients who underwent oophorectomy was significantly larger than that in the patients who underwent conservative surgery (7.8 ± 3.9 cm vs. 5.7 ± 2.9 cm, respectively, p = .001). In our study, the risk factors for oophorectomy were a malignant pathology and large tumor size. In accordance with the Gynecologic Cancer Intergroup consensus, we recommend that surgical management of ovarian masses in children should be based on ovarian-preserving surgery.


Asunto(s)
Neoplasias Ováricas/cirugía , Ovariectomía , Ovario/cirugía , Adolescente , Niño , Preescolar , Femenino , Preservación de la Fertilidad , Humanos , Neoplasias Ováricas/patología , Ovario/patología , Estudios Retrospectivos , Túnez
13.
Arch Pediatr ; 24(9): 860-864, 2017 Sep.
Artículo en Francés | MEDLINE | ID: mdl-28754280

RESUMEN

Ureterocele is a rare urologic disorder characterized by pseudocystic dilatation of the terminal submucosal ureter. Most cases of ureteroceles are associated with complete ureteral duplicity and ureterohydronephrosis, whereas ureteroceles on simplex ureters are rarer. The authors report two cases of bilateral ureteroceles on simplex ureters diagnosed prenatally at 30 and 32weeks gestation. Fetal ultrasound had revealed bilateral ureterohydronephrosis. The delivery was made at term and renal function was normal at birth. Radiological and isotopic studies of the urinary tract confirmed the diagnosis of bilateral ureteroceles on simplex ureters that were obstructive in one case and not obstructive in the other case. Both cases had urinary antiseptic treatment and neither had urinary infection. Endoscopic puncture with electrocoagulation of ureteroceles was performed at 8 and 14months of age, respectively, with a simple postoperative course. Prenatal diagnosis of ureteroceles is essential to plan early multidisciplinary care to avoid long-term renal consequences.


Asunto(s)
Diagnóstico Prenatal , Ureterocele/diagnóstico por imagen , Ureterocele/terapia , Femenino , Humanos , Recién Nacido , Masculino
15.
AJNR Am J Neuroradiol ; 38(6): 1266-1273, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28428212

RESUMEN

BACKGROUND AND PURPOSE: T2*-weighted imaging provides sharp contrast between spinal cord GM and WM, allowing their segmentation and cross-sectional area measurement. Injured WM demonstrates T2*WI hyperintensity but requires normalization for quantitative use. We introduce T2*WI WM/GM signal-intensity ratio and compare it against cross-sectional area, the DTI metric fractional anisotropy, and magnetization transfer ratio in degenerative cervical myelopathy. MATERIALS AND METHODS: Fifty-eight patients with degenerative cervical myelopathy and 40 healthy subjects underwent 3T MR imaging, covering C1-C7. Metrics were automatically extracted at maximally compressed and uncompressed rostral/caudal levels. Normalized metrics were compared with t tests, area under the curve, and logistic regression. Relationships with clinical measures were analyzed by using Pearson correlation and multiple linear regression. RESULTS: The maximally compressed level cross-sectional area demonstrated superior differences (P = 1 × 10-13), diagnostic accuracy (area under the curve = 0.890), and univariate correlation with the modified Japanese Orthopedic Association score (0.66). T2*WI WM/GM showed strong differences (rostral: P = 8 × 10-7; maximally compressed level: P = 1 × 10-11; caudal: P = 1 × 10-4), correlations (modified Japanese Orthopedic Association score; rostral: -0.52; maximally compressed level: -0.59; caudal: -0.36), and diagnostic accuracy (rostral: 0.775; maximally compressed level: 0.860; caudal: 0.721), outperforming fractional anisotropy and magnetization transfer ratio in most comparisons and cross-sectional area at rostral/caudal levels. Rostral T2*WI WM/GM showed the strongest correlations with focal motor (-0.45) and sensory (-0.49) deficits and was the strongest independent predictor of the modified Japanese Orthopedic Association score (P = .01) and diagnosis (P = .02) in multivariate models (R2 = 0.59, P = 8 × 10-13; area under the curve = 0.954, respectively). CONCLUSIONS: T2*WI WM/GM shows promise as a novel biomarker of WM injury. It detects damage in compressed and uncompressed regions and contributes substantially to multivariate models for diagnosis and correlation with impairment. Our multiparametric approach overcomes limitations of individual measures, having the potential to improve diagnostics, monitor progression, and predict outcomes.


Asunto(s)
Sustancia Gris/diagnóstico por imagen , Imagen por Resonancia Magnética/métodos , Traumatismos de la Médula Espinal/diagnóstico por imagen , Médula Espinal/diagnóstico por imagen , Sustancia Blanca/diagnóstico por imagen , Adulto , Anciano , Anatomía Transversal , Anisotropía , Imagen de Difusión Tensora , Evaluación de la Discapacidad , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Compresión de la Médula Espinal/diagnóstico por imagen
16.
AJNR Am J Neuroradiol ; 38(6): 1257-1265, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28428213

RESUMEN

BACKGROUND AND PURPOSE: DTI, magnetization transfer, T2*-weighted imaging, and cross-sectional area can quantify aspects of spinal cord microstructure. However, clinical adoption remains elusive due to complex acquisitions, cumbersome analysis, limited reliability, and wide ranges of normal values. We propose a simple multiparametric protocol with automated analysis and report normative data, analysis of confounding variables, and reliability. MATERIALS AND METHODS: Forty healthy subjects underwent T2WI, DTI, magnetization transfer, and T2*WI at 3T in <35 minutes using standard hardware and pulse sequences. Cross-sectional area, fractional anisotropy, magnetization transfer ratio, and T2*WI WM/GM signal intensity ratio were calculated. Relationships between MR imaging metrics and age, sex, height, weight, cervical cord length, and rostrocaudal level were analyzed. Test-retest coefficient of variation measured reliability in 24 DTI, 17 magnetization transfer, and 16 T2*WI datasets. DTI with and without cardiac triggering was compared in 10 subjects. RESULTS: T2*WI WM/GM showed lower intersubject coefficient of variation (3.5%) compared with magnetization transfer ratio (5.8%), fractional anisotropy (6.0%), and cross-sectional area (12.2%). Linear correction of cross-sectional area with cervical cord length, fractional anisotropy with age, and magnetization transfer ratio with age and height led to decreased coefficients of variation (4.8%, 5.4%, and 10.2%, respectively). Acceptable reliability was achieved for all metrics/levels (test-retest coefficient of variation < 5%), with T2*WI WM/GM comparing favorably with fractional anisotropy and magnetization transfer ratio. DTI with and without cardiac triggering showed no significant differences for fractional anisotropy and test-retest coefficient of variation. CONCLUSIONS: Reliable multiparametric assessment of spinal cord microstructure is possible by using clinically suitable methods. These results establish normalization procedures and pave the way for clinical studies, with the potential for improving diagnostics, objectively monitoring disease progression, and predicting outcomes in spinal pathologies.


Asunto(s)
Vértebras Cervicales/diagnóstico por imagen , Vértebras Cervicales/ultraestructura , Imagen de Difusión Tensora/métodos , Imagen por Resonancia Magnética/métodos , Traumatismos de la Médula Espinal/diagnóstico por imagen , Médula Espinal/diagnóstico por imagen , Médula Espinal/ultraestructura , Adulto , Anciano , Anatomía Transversal , Anisotropía , Estudios de Factibilidad , Femenino , Voluntarios Sanos , Corazón/fisiología , Humanos , Procesamiento de Imagen Asistido por Computador , Masculino , Persona de Mediana Edad , Valores de Referencia , Reproducibilidad de los Resultados , Adulto Joven
17.
Arch Pediatr ; 22(4): 380-2, 2015 Apr.
Artículo en Francés | MEDLINE | ID: mdl-25725973

RESUMEN

Disseminated lymphangiomatosis is a congenital lymphovenous vascular malformation. It can occur in different regions, some of which are unusual. The treatment of this vascular malformation is based on surgical excision, sclerotherapy, or recombinant interferon therapy. We report the case of disseminated lymphangiomatosis in a 13-year-old girl who presented with anemia.


Asunto(s)
Anemia/etiología , Vasos Linfáticos/anomalías , Malformaciones Vasculares/complicaciones , Adolescente , Femenino , Humanos
19.
Arch Pediatr ; 21(12): 1339-43, 2014 Dec.
Artículo en Francés | MEDLINE | ID: mdl-25449446

RESUMEN

UNLABELLED: Gastric volvulus is an abnormal rotation of all or a part of the stomach around one of its axes. It is a rare cause of intestinal obstruction in children. This anomaly can be primary, due to abnormalities of the gastric ligaments, or secondary to other congenital malformations. We report on the cases of five children treated between January 1994 and December 2011, four boys and one girl, with a medium age of 7 months. Diagnosis was based on clinical features, particularly in the upper gastrointestinal Rx contrast study, which confirmed the diagnosis. Four out of the five children underwent laparoscopic surgery with fixation of the stomach. A diaphragmatic hernia was associated in one case. Antireflux surgery was performed in three cases, and a diaphragmatic defect was closed in one case. The follow-up was uneventful after a medium period of 7 years. CONCLUSION: good knowledge of this anomaly is the guarantee of early diagnosis and optimum treatment to ameliorate the prognosis.


Asunto(s)
Vólvulo Gástrico , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Vólvulo Gástrico/diagnóstico , Vólvulo Gástrico/cirugía
20.
Arch Pediatr ; 21(9): 1011-5, 2014 Sep.
Artículo en Francés | MEDLINE | ID: mdl-25089042

RESUMEN

Cystic lymphangiomas are benign malformative tumors of the lymphatic vessels, rare but potentially serious and usually located in the cervical region. The diagnosis is usually easy, but the treatment is sometimes difficult because of their location and extension into the surrounding tissue. We report a case of giant cystic lymphangioma of the right axillary-thoracic wall diagnosed by prenatal ultrasound at 20 weeks gestation. The male infant was born at 37 weeks gestation with a large, swelling, lateral parietal right chest. Ultrasound soft tissue and chest CT scan confirmed the diagnosis of giant cystic lymphangioma of the right axillary-thoracic wall. Surgical excision was performed on the 21st day after birth and the mass was excised incompletely. The postoperative course was uncomplicated. Ultrasound soft tissue follow-up showed the persistence of multiple cystic structures in the axilla. Prenatal diagnosis of these tumors is essential for planning multidisciplinary management in early postnatal care.


Asunto(s)
Linfangioma Quístico/diagnóstico , Diagnóstico Prenatal , Neoplasias Torácicas/diagnóstico , Pared Torácica , Femenino , Humanos , Recién Nacido , Masculino , Embarazo
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