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2.
Artigo em Inglês | MEDLINE | ID: mdl-37417678

RESUMO

Summary: Pancreatic dysgenesis (PD) is a rare congenital disease, with less than 100 cases reported in the literature. In most cases, patients are asymptomatic and the diagnosis is made incidentally. In this report, we present the case of two brothers with a history of intrauterine growth retardation, low birth weight, hyperglycemia, and poor weight gain. The diagnosis of PD and neonatal diabetes mellitus was made by an interdisciplinary team composed of an endocrinologist, a gastroenterologist, and a geneticist. Once the diagnosis was made, treatment with an insulin pump, pancreatic enzyme replacement therapy, and supplementation with fat-soluble vitamins was decided. The use of the insulin infusion pump facilitated the outpatient treatment of both patients. Learning points: Pancreatic dysgenesis is a relatively rare congenital anomaly; most of the time, patients are asymptomatic and are diagnosed incidentally. The diagnosis of pancreatic dysgenesis and neonatal diabetes mellitus should be made with an interdisciplinary team. Due to its flexibility, the use of an insulin infusion pump facilitated the management of these two patients.

3.
Int J Mol Sci ; 22(19)2021 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-34638696

RESUMO

Recent advances in programmable nucleases including meganucleases (MNs), zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs), and clustered regularly interspaced short palindromic repeats-Cas (CRISPR-Cas) have propelled genome editing from explorative research to clinical and industrial settings. Each technology, however, features distinct modes of action that unevenly impact their applicability across the entire genome and are often tested under significantly different conditions. While CRISPR-Cas is currently leading the field due to its versatility, quick adoption, and high degree of support, it is not without limitations. Currently, no technology can be regarded as ideal or even applicable to every case as the context dictates the best approach for genetic modification within a target organism. In this review, we implement a four-pillar framework (context, feasibility, efficiency, and safety) to assess the main genome editing platforms, as a basis for rational decision-making by an expanding base of users, regulators, and consumers. Beyond carefully considering their specific use case with the assessment framework proposed here, we urge stakeholders interested in genome editing to independently validate the parameters of their chosen platform prior to commitment. Furthermore, safety across all applications, particularly in clinical settings, is a paramount consideration and comprehensive off-target detection strategies should be incorporated within workflows to address this. Often neglected aspects such as immunogenicity and the inadvertent selection of mutants deficient for DNA repair pathways must also be considered.


Assuntos
Sistemas CRISPR-Cas , Edição de Genes , Segurança , Estudos de Viabilidade , Humanos
4.
J Breath Res ; 15(4)2021 10 05.
Artigo em Inglês | MEDLINE | ID: mdl-34544050

RESUMO

Use of computational fluid dynamic (CFD) modeling to predict temporal and spatial constituent exposure for non-electronic nicotine delivery systems (ENDS) users (passive exposure) provides a more efficient methodology compared to conducting actual exposure studies. We conducted a clinical study measuring exhaled breath concentrations of glycerin, propylene glycol, nicotine, benzoic acid, formaldehyde, acetaldehyde, acrolein, menthol and carbon monoxide from use of eight different commercial ENDS devices and a non-menthol and menthol cigarette. Because baseline adjusted levels of other constituents were not consistently above the limit of detection, the mean minimum and maximum per puff exhaled breath concentrations (N= 20/product) of glycerin (158.7-260.9µg), propylene glycol (0.941-3.58µg), nicotine (0.10-1.06µg), and menthol (0.432-0.605µg) from use of the ENDS products were used as input parameters to predict temporal and spatial concentrations in an environmental chamber, office, restaurant, and car using different ENDS use scenarios. Among these indoor locations and ENDS use scenarios, the car with closed windows resulted in the greatest concentrations while opening the car windows produced the lowest concentrations. The CFD predicted average maximum glycerin and propylene glycol concentration ranged from 0.25 to 1068µg m-3and 1.5 pg m-3to 13.56µg m-3,respectively. For nicotine and menthol the CFD predicted maximum concentration ranged from 0.16 pg m-3to 4.02µg m-3and 0.068 pg m-3to 2.43µg m-3, respectively. There was better agreement for CFD-predicted nicotine concentrations than glycerin and propylene glycol with published reports highlighting important experimental and computational variables. Maximum measured nicotine levels from environmental tobacco smoke in offices, restaurants, and cars exceeded our maximum average CFD predictions by 7-97 times. For all the measured exhaled breath constituents and CFD predicted constituents, except for propylene glycol and glycerin, concentrations were less from use of ENDS products compared to combustible cigarettes. NCT number: NCT04143256.


Assuntos
Sistemas Eletrônicos de Liberação de Nicotina , Poluição por Fumaça de Tabaco , Testes Respiratórios , Humanos , Hidrodinâmica , Nicotina
5.
Clin Case Rep ; 9(7): e04410, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34295476

RESUMO

Mandibular reconstructions are complex clinical pictures that require careful planning for functional and aesthetic outcomes. Virtual surgical planning and 3D printing are ideal to achieve a predictable result. Through "hybrid techniques" (prebending plates with 3D-models) and free software, this goal is within reach for clinics with limited financial resources.

6.
Nat Commun ; 12(1): 2359, 2021 04 21.
Artigo em Inglês | MEDLINE | ID: mdl-33883558

RESUMO

How adhesive forces are transduced and integrated into biochemical signals at focal adhesions (FAs) is poorly understood. Using cells adhering to deformable micropillar arrays, we demonstrate that traction force and FAK localization as well as traction force and Y397-FAK phosphorylation are linearly coupled at individual FAs on stiff, but not soft, substrates. Similarly, FAK phosphorylation increases linearly with external forces applied to FAs using magnetic beads. This mechanosignaling coupling requires actomyosin contractility, talin-FAK binding, and full-length vinculin that binds talin and actin. Using an in vitro 3D biomimetic wound healing model, we show that force-FAK signaling coupling coordinates cell migration and tissue-scale forces to promote microtissue repair. A simple kinetic binding model of talin-FAK interactions under force can recapitulate the experimental observations. This study provides insights on how talin and vinculin convert forces into FAK signaling events regulating cell migration and tissue repair.


Assuntos
Quinase 1 de Adesão Focal/metabolismo , Adesões Focais/metabolismo , Modelos Biológicos , Actomiosina/metabolismo , Animais , Fenômenos Biomecânicos , Biomimética , Movimento Celular/fisiologia , Células Cultivadas , Fibroblastos/metabolismo , Quinase 1 de Adesão Focal/deficiência , Quinase 1 de Adesão Focal/genética , Mecanotransdução Celular , Camundongos , Camundongos Knockout , Fosforilação , RNA Interferente Pequeno/genética , Transdução de Sinais , Talina/antagonistas & inibidores , Talina/genética , Talina/metabolismo , Cicatrização/fisiologia
7.
Nanomaterials (Basel) ; 11(5)2021 Apr 27.
Artigo em Inglês | MEDLINE | ID: mdl-33925353

RESUMO

In this study, tomato plants were grown in vitro with and without incorporation of TiO2 nanoparticles in Murashige and Skoog (MS) growth medium. The aim of this study was to describe the morphological (area and roundness cell) and mechanical (Young's Modulus) change in the different tissue of tomato root, epidermis (Ep), parenchyma (Pa), and vascular bundles (Vb), when the whole plant was exposed to TiO2 nanoparticles (TiO2 NPs). light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM), wavelength dispersive X-ray fluorescence (WDXRF) techniques were used to identify changes into the root cells when TiO2 NPs were incorporated. TiO2 NPs incorporation produces changes in the area, roundness, and Young's Modulus of the tomato root. When tomato root is exposed to TiO2 NPs, the Ep and Vb area size decreases from 260.92 µm2 to 160.71 µm2 and, 103.08 µm2 to 52.13 µm2, respectively, compared with the control area, while in Pa tissue the area size was increased considerably from 337.72 mm2 to 892.96 mm2. Cellular roundness was evident in tomato root that was exposed to TiO2 NPs in the Ep (0.49 to 0.67), Pa (0.63 to 0.79), and Vb (0.76 to 0.71) area zones. Young's Modulus in Pa zone showed a rigid mechanical behavior when tomato root is exposed to TiO2 NPs (0.48 to 4.98 MPa control and TiO2 NPs, respectively). Meanwhile, Ep and Vb were softer than the control sample (13.9 to 1.06 MPa and 6.37 to 4.41 MPa respectively). This means that the Pa zone was stiffer than Ep and Vb when the root is exposed to TiO2 NPs. Furthermore, TiO2 NPs were internalized in the root tissue of tomato, accumulating mainly in the cell wall and intercellular spaces, with a wide distribution throughout the tissue, as seen in TEM.

8.
Phys Chem Chem Phys ; 23(3): 1994-2004, 2021 Jan 28.
Artigo em Inglês | MEDLINE | ID: mdl-33439167

RESUMO

We herein report an ab initio molecular dynamics study on a natural DES composed of urea and betaine in a 3 : 2 ratio, as a test case for evaluating the water effect. The article deals with a theoretical study using both ab initio molecular dynamics and quantum chemistry computations in order to unravel the role of water in the nanostructure of a urea-betaine mixture. Preliminary molecular dynamics outcomes (both radial and spatial distribution functions) suggest that water promotes the association between urea and betaine by increasing the hydrogen bond network and precluding the aggregation of urea molecules. In other words, the presence of water allows a less restrictive hydrogen bond network, presenting a regimen where the strong hydrogen bond interactions are replaced by a wide variety of weaker hydrogen bond interactions. On the other hand, in a water free DES there is a regimen where strong urea-betaine interactions are dominant. It is shown that second order perturbation theory energy analysis provides cogent insights into charge spreading and hydrogen bond patterns. A vibrational analysis (both IR and power spectrum) over the ab initio molecular dynamics trajectories in the water free DES as well as in the urea-betaine-water systems reveals that our results are consistent with the second order perturbation theory analysis and with the hydrogen bond network pattern.

9.
Toxicol In Vitro ; 67: 104870, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32330563

RESUMO

Accurately determining the delivered dose is critical to understanding biological response due to cell exposure to chemical constituents in aerosols. Deposition efficiency and uniformity of deposition was measured experimentally using monodisperse solid fluorescent particles with mass median aerodynamic diameters (MMAD) of 0.51, 1.1, 2.2 and 3.3 µm in the Vitrocell® AMES 48 air-liquid-interface (ALI) in vitro exposure system. Experimental results were compared with computational fluid dynamic, (CFD; using both Lagrangian and Eulerian approaches) predicted deposition efficiency and uniformity for a single row (N = 6) of petri dishes in the Vitrocell® AMES 48 system. The average experimentally measured deposition efficiency ranged from 0.007% to 0.43% for 0.51-3.3 µm MMAD particles, respectively. There was good agreement between average experimentally measured and the CFD predicted particle deposition efficiency, regardless of approach. Experimentally measured and CFD predicted average uniformity of deposition was greater than 45% of the mean for all particle diameters. During this work a new design was introduced by the manufacturer and evaluated using Lagragian CFD. Lagragian CFD predictions showed better uniformity of deposition, but reduced deposition efficiency with the new design. Deposition efficiency and variability in particle deposition across petri dishes for solid particles should be considered when designing exposure regimens using the Vitrocell® AMES 48 ALI in vitro exposure system.


Assuntos
Técnicas de Cultura de Células/instrumentação , Hidrodinâmica , Aerossóis , Ar , Material Particulado
10.
Nanomaterials (Basel) ; 9(11)2019 Oct 27.
Artigo em Inglês | MEDLINE | ID: mdl-31717847

RESUMO

A series of samples of Mg/Zn/Al LDHs (layered double hydroxides) materials was prepared by the co-precipitation and urea hydrolysis methods. They were modified with organic surfactants (acrylate and oleate anions) and characterized by X-ray diffraction, which corroborated the intercalation of anionic species into the interlayer space. The hydrophobized materials were incorporated at low contents (10 and 15 wt.%) to polystyrene, which was synthesized by emulsion polymerization techniques. The polymeric composites were analyzed by thermogravimetry to determine the decomposition temperature. The results demonstrated that the materials with Zn presented the greatest increment in the degradation temperature (7 °C < T < 54 °C). Moreover, the Friedman, Flynn-Wall-Ozawa, and Coats-Redfern models were compared to obtain the kinetic parameters of degradation process. The obtained order of decomposition of the Coats-Redfern model showed that the decomposition process occurs in at least two stages. Finally, the addition of environmentally friendly modified Layered Double Hydroxides (LDH) nanomaterials to the polystyrene (PS) matrix allowed for obtaining polymeric composites with higher thermal stability, retarding the decomposition process of PS.

11.
Intensive Care Med ; 44(11): 1797-1806, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30343313

RESUMO

PURPOSE: We set out to assess the resuscitation fluid requirements and physiological and clinical responses of intensive care unit (ICU) patients resuscitated with 20% albumin versus 4-5% albumin. METHODS: We performed a randomised controlled trial in 321 adult patients requiring fluid resuscitation within 48 h of admission to three ICUs in Australia and the UK. RESULTS: The cumulative volume of resuscitation fluid at 48 h (primary outcome) was lower in the 20% albumin group than in the 4-5% albumin group [median difference - 600 ml, 95% confidence interval (CI) - 800 to - 400; P < 0.001]. The 20% albumin group had lower cumulative fluid balance at 48 h (mean difference - 576 ml, 95% CI - 1033 to - 119; P = 0.01). Peak albumin levels were higher but sodium and chloride levels lower in the 20% albumin group. Median (interquartile range) duration of mechanical ventilation was 12.0 h (7.6, 33.1) in the 20% albumin group and 15.3 h (7.7, 58.1) in the 4-5% albumin group (P = 0.13); the proportion of patients commenced on renal replacement therapy after randomization was 3.3% and 4.2% (P = 0.67), respectively, and the proportion discharged alive from ICU was 97.4% and 91.1% (P = 0.02). CONCLUSIONS: Resuscitation with 20% albumin decreased resuscitation fluid requirements, minimized positive early fluid balance and was not associated with any evidence of harm compared with 4-5% albumin. These findings support the safety of further exploration of resuscitation with 20% albumin in larger randomised trials. TRIAL REGISTRATION: http://www.anzctr.org.au . Identifier ACTRN12615000349549.


Assuntos
Albuminas/administração & dosagem , Cuidados Críticos/métodos , Hidratação/métodos , Ressuscitação/métodos , Adulto , Idoso , Austrália , Estudos de Coortes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Reino Unido , Equilíbrio Hidroeletrolítico
12.
Int J Mycobacteriol ; 7(3): 275-281, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30198510

RESUMO

Introduction: Tuberculosis (TB) is a significant cause of morbidity and mortality worldwide. The patient compliance with the long treatment regimens is essential for successful eradication. Pyrazinamide (PZA) shortens these regimens from 9 to 6 months, and therefore, improves treatment completion rates. Although PZA is a first-line medication for the treatment of TB, no simple or reliable assay to determine PZA resistance is yet available. In the presence of PZA, only susceptible Mycobacterium tuberculosis strains release pyrazinoic acid (POA). Therefore, the measurement and quantification of released POA is an indicator of PZA resistance. Methods: Two electrochemical sensors were constructed and tested with alternative working electrodes in conjunction with a portable potentiostat to measure the current produced when a potential difference of 2 V is applied to varying concentrations of POA in controlled solutions. Results: The large (13.2 mm) electrochemical sensor was able to detect POA at a minimum concentration of 40 µM to a statistically significant level (P = 0.0190). Similar graphical trends were obtained when testing the electrochemical sensor in the supernatant of a negative microscopic observation drug susceptibility assay culture, irrespective of the presence of PZA. Conclusion: Inexpensive and reusable electrochemical sensors with a portable potentiostat are a promising tool for the detection of POA, a biomarker of PZA susceptible M. Tuberculosis.


Assuntos
Farmacorresistência Bacteriana , Técnicas Eletroquímicas , Mycobacterium tuberculosis/efeitos dos fármacos , Pirazinamida/farmacologia , Antituberculosos/farmacologia , Meios de Cultura , Eletrodos , Humanos , Testes de Sensibilidade Microbiana , Potenciometria , Pirazinamida/análogos & derivados , Pirazinamida/isolamento & purificação , Tuberculose/microbiologia , Tuberculose Resistente a Múltiplos Medicamentos/microbiologia
13.
Med Educ ; 51(7): 699-707, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28436048

RESUMO

CONTEXT: The workplace can be a strenuous setting for residents: although it offers a wealth of learning opportunities, residents find themselves juggling their responsibilities. Even though supervisors regulate what is afforded to residents, the former find it difficult to strike the proper balance between residents' independence and support, which could create tensions. But what tensions do residents experience during clinical supervision and how do they cope with them to maximise their learning opportunities? Understanding how residents act on different affordances in the workplace is of paramount importance, as it influences their learning. METHOD: Residents from different levels of training and disciplines participated in three focus groups (n = 19) and 10 semi-structured interviews (n = 10). The authors recruited these trainees using purposive and convenience sampling. Audio-recordings were transcribed verbatim and the ensuing scripts were analysed using a constructivist grounded theory methodology. RESULTS: Residents reported that the autonomy and practice opportunities given by their supervisors were either excessive or too limited, and both were perceived as tensions. When in excess, trainees enlisted the help of their supervisor or peers, depending on how safe they recognised the learning environment to be. When practice opportunities were curtailed, trainees tried to negotiate more if they felt the learning environment was safe. When they did not, trainees became passive observers. Learning from each engagement was subject to the extent of intersubjectivity achieved between the actors involved. CONCLUSIONS: Tensions arose when supervisors did not give trainees the desired degree of autonomy and opportunities to participate. Trainees responded in various ways to maximise their learning opportunities. For these different engagement-related responses to enhance workplace learning in specialty training, achieving intersubjectivity between trainee and supervisor seems foundational.


Assuntos
Internato e Residência , Autonomia Pessoal , Médicos/psicologia , Autonomia Profissional , Local de Trabalho , Docentes de Medicina , Grupos Focais , Humanos
14.
Int J Paleopathol ; 13: 20-26, 2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29539505

RESUMO

The aim of this work is to report a probable first case of a thoracic aortic aneurysm in the remains of a pre-Columbian individual from South America and to explore the relationship of this case to the only other paleopathological case previously described. We also consider the implications of both cases for the origins of syphilis. This study is based on the macroscopical analysis of human remains recovered during excavation of the Chiu Chiu 273 prehistoric cemetery, in the Antofagasta Region of Northern Chile. Ceramic sherds from the grave have a thermoluminescence date of 2160±100 A.P. or 210 B.C. The skeletal remains of an adult individual display resorptive lesions in both the sternum and the first two thoracic vertebrae, which are suggestive of a thoracic aortic aneurysm. The lesions observed in the case described are clearly compatible with the development of an aneurysm of the thoracic aorta (ascending portion and arch). We suggest that this aneurysm has a syphilitic etiology, considering the vascular segments compromised, the type of lesions observed, and the prevalent etiology of this kind of cardiovascular pathology in pre-penicillin times. Since the only two cases of thoracic aortic aneurysms reported to date have been found in the Americas and are clearly pre-Columbian, it can be suggested that venereal syphilis was present in the Americas in times before European contact.

15.
PLoS One ; 10(6): e0129117, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26120838

RESUMO

OBJECTIVE: Currently, no investigations reliably identify placental dysfunction in late pregnancy. To facilitate the development of such investigations we aimed to identify placental features that differ between normal and adverse outcome in late pregnancy in a group of pregnancies with reduced fetal movement. METHODS: Following third trimester presentation with reduced fetal movement (N = 100), placental structure ex vivo was measured. Placental function was then assessed in terms of (i) chorionic plate artery agonist responses and length-tension characteristics using wire myography and (ii) production and release of placentally derived hormones (by quantitative polymerase chain reaction and enzyme linked immunosorbant assay of villous tissue and explant conditioned culture medium). RESULTS: Placentas from pregnancies ending in adverse outcome (N = 23) were ~25% smaller in weight, volume, length, width and disc area (all p<0.0001) compared with those from normal outcome pregnancies. Villous and trophoblast areas were unchanged, but villous vascularity was reduced (median (interquartile range): adverse outcome 10 (10-12) vessels/mm2 vs. normal outcome 13 (12-15), p = 0.002). Adverse outcome pregnancy placental arteries were relatively insensitive to nitric oxide donated by sodium nitroprusside compared to normal outcome pregnancy placental arteries (50% Effective Concentration 30 (19-50) nM vs. 12 (6-24), p = 0.02). Adverse outcome pregnancy placental tissue contained less human chorionic gonadotrophin (20 (11-50) vs. 55 (24-102) mIU/mg, p = 0.007) and human placental lactogen (11 (6-14) vs. 27 (9-50) mg/mg, p = 0.006) and released more soluble fms-like tyrosine kinase-1 (21 (13-29) vs. 5 (2-15) ng/mg, p = 0.01) compared with normal outcome pregnancy placental tissue. CONCLUSION: These data provide a description of the placental phenotype of adverse outcome in late pregnancy. Antenatal tests that accurately reflect elements of this phenotype may improve its prediction.


Assuntos
Placenta/patologia , Resultado da Gravidez , Terceiro Trimestre da Gravidez/fisiologia , Adulto , Sistema Endócrino/patologia , Sistema Endócrino/fisiopatologia , Feminino , Retardo do Crescimento Fetal/patologia , Movimento Fetal , Humanos , Placenta/irrigação sanguínea , Placenta/fisiopatologia , Gravidez , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Natimorto
16.
J Gastroenterol Hepatol ; 30(2): 279-85, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25091059

RESUMO

BACKGROUND AND AIM: Irritable bowel syndrome (IBS) is traditionally divided into subtypes depending on the bowel habit abnormality, but there is little clarity in the literature about whether these subtypes differ symptomatically or psychologically. Furthermore, there are conflicting reports on the relationship between symptom severity and psychological status. The aim of this study was to address these issues in a large cohort of patients defined by bowel habit. METHODS: One thousand IBS patients were divided into diarrhea (IBS-D), constipation (IBS-C), and mixed (IBS-M) bowel habit subtypes and completed a series of validated questionnaires capturing symptom severity, non-colonic symptomatology (somatization), quality of life, and anxiety or depression levels. Comparisons were made using SPSS version 20. RESULTS: There were no significant differences between the three subtypes with respect to symptom severity, abdominal pain intensity, non-colonic symptomatology, quality of life, and anxiety or depression scores (all Ps > 0.05). In addition, there was only a small but statistically significant correlation between IBS symptom severity and both anxiety or depression, as well as quality of life (highest r = 0.34), while the relationship between somatization and disease severity was moderate (r = 0.42). CONCLUSION: This study suggests that there are no differences in the symptom profiles and anxiety or depression scores between different subtypes of IBS. In addition, anxiety and depression do not appear to be strongly associated with symptom severity, although this does not exclude the possible interplay between these and other psychological drivers of severity, such as poor coping skills.


Assuntos
Síndrome do Intestino Irritável/fisiopatologia , Síndrome do Intestino Irritável/psicologia , Adaptação Psicológica , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Ansiedade , Estudos de Coortes , Constipação Intestinal , Depressão , Diarreia , Feminino , Humanos , Síndrome do Intestino Irritável/classificação , Masculino , Pessoa de Meia-Idade , Qualidade de Vida , Índice de Gravidade de Doença , Inquéritos e Questionários , Adulto Jovem
17.
Rev. chil. cardiol ; 33(2): 127-135, 2014. ilus, tab
Artigo em Espanhol | LILACS | ID: lil-726138

RESUMO

Los aneurismas corresponden a una dilatación arterial localizada que es producida por una debilidad de la pared; se clasifican en verdaderos y falsos. La incidencia es de aproximadamente 6 - 10 casos por 100.000 habitantes al año y los aneurismas de la aorta ascendente son los más frecuentes dentro del grupo de los aneurismas de la aorta torácica (AAT). Habitualmente se generan como resultado de una necrosis quística de la media que suele estar asociada a otras patologías. Los aneurismas suelen pesquisarse de manera incidental mediante exámenes imagenológicos solicitados por diferentes motivos. Su historia natural no está completamente clarificada, pero en términos generales los AAT tienen un crecimiento promedio de 0,1 cm por año. La angiografía por tomografía computada o por resonancia magnética, son los exámenes de elección para el diagnóstico. Para aquellos pacientes con aneurismas pequeños que no requieren cirugía, las medidas orientadas a la reducción del riesgo de ateroesclerosis son el pilar del tratamiento. Para los aneurismas de la aorta ascendente que cumplan con los requisitos, requieran de revascularización coronaria o reemplazo valvular, se recomienda el tratamiento quirúrgico. En relación a los aneurismas del cayado aórtico las opciones terapéuticas son tres: cirugía, terapia endovascular y terapia combinada. Para los aneurismas de la aorta descendente la terapia endovascular se perfila como la más eficiente. Los pacientes sin indicación de tratamiento quirúrgico o endovascular deben ser controlados de manera seriada con estudios imagenológicos.


Aneurysms are defined as a localized dilatation caused by a weakness in the arterial wall. and may be classified as true or false aneurysm. The incidence is estimated to be 6-10 cases per 100,000 patient years. Aneurysms of the ascending aorta are the most common within the group of thoracic aortic aneurysms (TAA). These often result from cystic medial degeneration, which tends to be associated with other pathologic entities. Aneurysms are diagnosed most commonly on imaging studies performed for an unrelated indication. Although its natural history remains unclear, it is known that current average growth is about 0.1 cm per year. Computed tomography angiography (CTA) and magnetic resonance angiography (MRA) are the preferred imaging tests to detect aortic aneurysms. Measures aimed to reduce atherosclerosis risk are the main treatment objective for patients with smaller aneurysms that do not require surgery. When ascending aortic aneurysms meet the size criteria or coronary revascularization and aortic valvular replacement are necessary, surgical treatment it's recommended. For aortic arch aneurysms, there are three therapeutic alternatives: surgery, endovascular therapy and combined therapy. For descending aortic aneurysms, endovascular therapy is the preferred procedure. Patients with no indication for surgical or endovascular therapy, should be followed up with serial imaging studies.


Assuntos
Humanos , Aneurisma da Aorta Torácica/diagnóstico , Aneurisma da Aorta Torácica/terapia , Aneurisma da Aorta Torácica/classificação , Aneurisma da Aorta Torácica/fisiopatologia
18.
Rev. colomb. ortop. traumatol ; 21(1): 36-43, mar. 2007. tab, ilus
Artigo em Espanhol | LILACS | ID: lil-619336

RESUMO

Objetivo: determinar la concordancia entre resonancia magnética (RM) y artroscopia de rodilla como patrón de oro en la escogencia del tipo de tratamiento para una ruptura meniscal con base en su caracterización morfológica. Materiales y métodos: estudio de concordancia diagnóstica de conformidad que incluyó pacientes que consultaron a la Fundación Santa Fe con lesiones meniscales, a quienes se practicó RM con cortes axiales, y fueron llevados a artroscopia. Se correlacionaron posibles tratamientos de acuerdo con configuración de la ruptura según hallazgos imagenológicos y artroscópicos, y se determinó concordancia entre éstos. Resultados: el coeficiente Kappa calculado fue de 0,61. Conclusiones: la concordancia encontrada entre RM y artroscopia es buena permitiendo predecir el posible tratamiento de acuerdo con la configuración de la ruptura.


Assuntos
Artroscopia , Meniscos Tibiais/lesões , Colômbia
19.
Prensa méd. argent ; 92(8): 550-554, oct. 2005. graf
Artigo em Espanhol | BINACIS | ID: bin-509

RESUMO

Se estudió el desgaste profesional de los enfermeros y médicos que trabajan en la Unidad de Terapia Intensiva del Hospital Francés de Buenos Aires. Se partió de la hipótesis que los enfermeros y médicos de Terapia Intensiva estaban desgastados profesionalmente debido a las características del sector donde desempeñan su rol y presentaban una Realización Profesional baja debido a las características de pacientes que asisten


Assuntos
Humanos , Corpo Clínico , Relações Médico-Paciente , Esgotamento Profissional/prevenção & controle , Unidades de Terapia Intensiva , Recursos Humanos de Enfermagem , Enfermagem em Emergência
20.
Prensa méd. argent ; 92(8): 550-554, oct. 2005. graf
Artigo em Espanhol | LILACS | ID: lil-425438

RESUMO

Se estudió el desgaste profesional de los enfermeros y médicos que trabajan en la Unidad de Terapia Intensiva del Hospital Francés de Buenos Aires. Se partió de la hipótesis que los enfermeros y médicos de Terapia Intensiva estaban desgastados profesionalmente debido a las características del sector donde desempeñan su rol y presentaban una Realización Profesional baja debido a las características de pacientes que asisten


Assuntos
Humanos , Esgotamento Profissional , Enfermagem em Emergência , Unidades de Terapia Intensiva , Corpo Clínico , Recursos Humanos de Enfermagem , Relações Médico-Paciente
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