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^{140}Ce(n,γ) is a key reaction for slow neutron-capture (s-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty ≈5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.
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Neutron capture reaction cross sections on 74 Ge are of importance to determine 74 Ge production during the astrophysical slow neutron capture process. We present new resonance data on 74 Ge( n , γ ) reactions below 70 keV neutron energy. We calculate Maxwellian averaged cross sections, combining our data below 70 keV with evaluated cross sections at higher neutron energies. Our stellar cross sections are in agreement with a previous activation measurement performed at Forschungszentrum Karlsruhe by Marganiec et al., once their data has been re-normalised to account for an update in the reference cross section used in that experiment.
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INTRODUCTION: Measuring health outcomes and costs per patient is an essential element of value-based healthcare (VBHC). The aim of the study was to generate expert consensus on the activities required to implement it. METHODS: A two-round modified Delphi study with healthcare professionals, quality and clinical management methodologists and managers with academic and/or practical experience in outcome measurement projects. A median equal to or greater than 4 and a relative interquartile range (RIQR) equal to or greater than 25% were established as consensus criteria. RESULTS: Consensus was obtained on 91% of the items (N=74/81). In terms of feasibility, the items that received the highest score and consensus were the existence of data protection guarantees (median=5; mean=4.8; RIQR=0%), the vision and motivation of healthcare professionals (median=5; mean=4.7; RIQR=20%), the existence and availability of ICT tools (or systems) for data recording (median=5; mean=4.5; RIQR=20%), and having sufficient funding to undertake the project (median=5; mean=4.2; RIQR=20%). The most highly rated factors adding complexity were the number of units or departments involved in the care process for the clinical condition (median=5; mean=4.4; RIQR=20%), having an accepted set of monitoring indicators for the condition (median=5; mean=4.4; RIQR=20%), and the involvement of several levels of care in the project (median=5; mean=4.3; RIQR=20%). CONCLUSIONS: We describe practical aspects for the application of systematic outcomes measurement in routine clinical practice. These results can serve as a tool for prioritising, sizing, resource planning, and estimating implementation costs.
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Atención a la Salud , Personal de Salud , Consenso , Técnica Delphi , Humanos , Evaluación de Resultado en la Atención de SaludRESUMEN
The neutron capture cross sections of several unstable nuclides acting as branching points in the s process are crucial for stellar nucleosynthesis studies. The unstable ^{171}Tm (t_{1/2}=1.92 yr) is part of the branching around mass Aâ¼170 but its neutron capture cross section as a function of the neutron energy is not known to date. In this work, following the production for the first time of more than 5 mg of ^{171}Tm at the high-flux reactor Institut Laue-Langevin in France, a sample was produced at the Paul Scherrer Institute in Switzerland. Two complementary experiments were carried out at the neutron time-of-flight facility (n_TOF) at CERN in Switzerland and at the SARAF liquid lithium target facility at Soreq Nuclear Research Center in Israel by time of flight and activation, respectively. The result of the time-of-flight experiment consists of the first ever set of resonance parameters and the corresponding average resonance parameters, allowing us to make an estimation of the Maxwellian-averaged cross sections (MACS) by extrapolation. The activation measurement provides a direct and more precise measurement of the MACS at 30 keV: 384(40) mb, with which the estimation from the n_TOF data agree at the limit of 1 standard deviation. This value is 2.6 times lower than the JEFF-3.3 and ENDF/B-VIII evaluations, 25% lower than that of the Bao et al. compilation, and 1.6 times larger than the value recommended in the KADoNiS (v1) database, based on the only previous experiment. Our result affects the nucleosynthesis at the Aâ¼170 branching, namely, the ^{171}Yb abundance increases in the material lost by asymptotic giant branch stars, providing a better match to the available pre-solar SiC grain measurements compared to the calculations based on the current JEFF-3.3 model-based evaluation.
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Patient Blood Management (PBM) programs have proven to be successful in reducing overuse and improving patient safety, clinical outcomes and efficiency. Despite its benefits, PBM is still scarcely used in real clinical practice with a high variability among hospitals in Spain. Recent guidelines from the European Union on how to implement PBM, as well as recommendations from experts in the field, suggest that further development in PBM implementation requires not only the participation of healthcare professionals but also the commitment and support of Health Authorities and senior hospital management. This article provides some thoughts on health care management and policy strategies to help implement PBM throughout the Spanish autonomous healthcare systems.
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Anemia , Transfusión Sanguínea , Política de Salud , Humanos , EspañaRESUMEN
We report on the measurement of the ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a key role in the lithium yield of the big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and they showed a large discrepancy between each other. The measurement was performed with a Si telescope and a high-purity sample produced by implantation of a ^{7}Be ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low energy, relative to current evaluations, in the region of BBN interest, the present results are consistent with the values inferred from the time-reversal ^{7}Li(p,n)^{7}Be reaction, thus yielding only a relatively minor improvement on the so-called cosmological lithium problem. The relevance of these results on the near-threshold neutron production in the p+^{7}Li reaction is also discussed.
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The energy-dependent cross section of the ^{7}Be(n,α)^{4}He reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron energy. The challenges posed by the short half-life of ^{7}Be and by the low reaction cross section have been overcome at n_TOF thanks to an unprecedented combination of the extremely high luminosity and good resolution of the neutron beam in the new experimental area (EAR2) of the n_TOF facility at CERN, the availability of a sufficient amount of chemically pure ^{7}Be, and a specifically designed experimental setup. Coincidences between the two alpha particles have been recorded in two Si-^{7}Be-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.
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A novel design of a silicon-based micro-reformer for onboard hydrogen generation from ethanol is presented in this work. The micro-reactor is fully fabricated with mainstream MEMS technology and consists of an active low-thermal-mass structure suspended by an insulating membrane. The suspended structure includes an embedded resistive metal heater and an array of ca. 20k vertically aligned through-silicon micro-channels per square centimetre. Each micro-channel is 500 µm in length and 50 µm in diameter allowing a unique micro-reformer configuration that presents a total surface per projected area of 16 cm(2) cm(-2) and per volume of 320 cm(2) cm(-3). The walls of the micro-channels become the active surface of the micro-reformer when coated with a homogenous thin film of Rh-Pd/CeO2 catalyst. The steam reforming of ethanol under controlled temperature conditions (using the embedded heater) and using the micro-reformer as a standalone device are evaluated. Fuel conversion rates above 94% and hydrogen selectivity values of ca. 70% were obtained when using operation conditions suitable for application in micro-solid oxide fuel cells (micro-SOFCs), i.e. 750 °C and fuel flows of 0.02 mlL min(-1) (enough to feed a one watt power source).
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OBJECTIVE: To score systemic activity at diagnosis and correlate baseline activity with survival in a large cohort of patients with primary Sjögren syndrome (SS). PATIENTS AND METHODS: We include 1045 consecutive patients who fulfilled the 2002 classification criteria for primary SS. The clinical and immunological characteristics and level of activity (EULAR-SS Disease Activity Index (ESSDAI) scores) were assessed at diagnosis as predictors of death using Cox proportional hazards regression analysis adjusted for age at diagnosis. The risk of death was calculated at diagnosis according to four different predictive models. RESULTS: After a mean follow-up of 117â months, 115 (11%) patients died. The adjusted standardised mortality ratio for the total cohort was 4.66 (95% CI 3.85 to 5.60), and survival rates at 5, 10, 20 and 30â years were 96%, 90%, 81% and 60%, respectively. The main baseline factors associated with overall mortality in the multivariate analysis were male gender, cryoglobulins and low C4 levels. Baseline activity in the constitutional, pulmonary and biological domains was associated with a higher risk of death. High activity in at least one ESSDAI domain (HR 2.14), a baseline ESSDAI score ≥14 (HR 1.85) and more than one laboratory predictive marker (lymphopenia, anti-La, monoclonal gammopathy, low C3, low C4 and/or cryoglobulins) (HR 2.82) were associated with overall mortality; these HRs increased threefold to 10-fold when the analysis was restricted to mortality associated with systemic disease. CONCLUSIONS: Patients with primary SS, who present at diagnosis with high systemic activity (ESSDAI ≥14) and/or predictive immunological markers (especially those with more than one), are at higher risk of death.
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Índice de Severidad de la Enfermedad , Síndrome de Sjögren/mortalidad , Adolescente , Adulto , Edad de Inicio , Anciano , Anciano de 80 o más Años , Anticuerpos Antinucleares/sangre , Biomarcadores/sangre , Complemento C3/análisis , Complemento C4/análisis , Crioglobulinas/análisis , Europa (Continente) , Femenino , Humanos , Linfopenia/sangre , Masculino , Persona de Mediana Edad , Paraproteinemias/sangre , Valor Predictivo de las Pruebas , Modelos de Riesgos Proporcionales , Síndrome de Sjögren/sangre , Factores de TiempoRESUMEN
Previous reports from our lab had shown that some anti-purinergic receptor P2X4 antibodies cross-reacted with misfolded forms of mutant Cu/Zn superoxide dismutase 1 (SOD1), linked to amyotrophic lateral sclerosis (ALS). Cross-reactivity could be caused by the abnormal exposure of an epitope located in the inner hydrophobic region of SOD1 that shared structural homology with the P2X4-immunizing peptide. We had previously raised antibodies against human SOD1 epitope mimicked by the P2X4 immunizing peptide. One of these antibodies, called AJ10, was able to recognize mutant/misfolded forms of ALS-linked mutant SOD1. Here, we used the AJ10 antigen as a vaccine to target neurotoxic species of mutant SOD1 in a slow mouse model of ALS. However, the obtained results showed no improvement in life span, disease onset or weight loss in treated animals; we observed an increased microglial neuroinflammatory response and high amounts of misfolded SOD1 accumulated within spinal cord neurons after AJ10 immunization. An increase of immunoglobulin G deposits was also found due to the treatment. Finally, a significantly worse clinical evolution was displayed by an impairment on motor function as a consequence of AJ10 peptide immunization.
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Esclerosis Amiotrófica Lateral/terapia , Inmunoterapia/efectos adversos , Inflamación/inducido químicamente , Péptidos/efectos adversos , Superóxido Dismutasa/química , Factores de Edad , Esclerosis Amiotrófica Lateral/inmunología , Esclerosis Amiotrófica Lateral/patología , Animales , Proteínas de Unión al Calcio/metabolismo , Citocinas/genética , Citocinas/metabolismo , Modelos Animales de Enfermedad , Conducta Exploratoria/fisiología , Proteína Ácida Fibrilar de la Glía/metabolismo , Humanos , Inmunoglobulina G/metabolismo , Ratones , Ratones Transgénicos , Proteínas de Microfilamentos/metabolismo , Neuronas/metabolismo , Neuronas/patología , Péptidos/inmunología , Receptores Purinérgicos P2X4/química , Receptores Purinérgicos P2X4/inmunología , Médula Espinal/metabolismo , Médula Espinal/patología , Superóxido Dismutasa/efectos adversos , Superóxido Dismutasa/genética , Superóxido Dismutasa/inmunología , Superóxido Dismutasa-1RESUMEN
OBJECTIVE: To describe how systemic disease is treated in a large cohort of Spanish patients with primary Sjögren syndrome (pSS) in daily practice, focusing on the adequacy of therapies for the level of systemic activity measured by ESSDAI score. PATIENTS AND METHODS: By December 2014, our database included 1120 consecutive patients who fulfilled the 2002 classification criteria for SS. Therapeutic schedules were classified into 4 categories: no systemic therapies, hydroxychloroquine (HCQ) and/or low dose glucocorticoids (GCS) (<20mg/day), high dose GCS (>20mg/day) and use of second-line therapies (immunosuppressive agents, intravenous immunoglobulins [IVIG] and/or rituximab [RTX]). RESULTS: There were 1048 (94%) women and 72 (6%) men , with a mean age at diagnosis of 54 years. The main drug-based therapeutic approaches for systemic pSS during follow-up were HCQ in 282 (25%) patients, GCS in 475 (42%, at doses >20mg/day in 255-23%), immunosuppressive agents in 148 (13%), IVIG in 25 (2%) and RTX in 35 (3%) patients. HCQ was associated with a lower risk of death (adjusted HR of 0.57, 95% 0.34-0.95). We classified 16 (7%) of the 255 patients treated with >20mg GCS and 21/148 (14%) treated with immunosuppressive agents as patients inadequately treated, mainly associated with articular involvement of low/moderate activity. CONCLUSION: The management of pSS should be organ-specific, using low dose GCS in patients with moderate systemic activity, limiting the use of high dose GCS and second-line therapies to refractory or potentially severe scenarios. The use of systemic therapies for dryness, chronic pain or fatigue is not warranted.
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Síndrome de Sjögren/tratamiento farmacológico , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Glucocorticoides/uso terapéutico , Humanos , Hidroxicloroquina/uso terapéutico , Inmunoglobulinas Intravenosas/uso terapéutico , Inmunosupresores/uso terapéutico , Masculino , Persona de Mediana Edad , Pautas de la Práctica en Medicina , Rituximab/uso terapéutico , España , Resultado del Tratamiento , Adulto JovenRESUMEN
Antecedentes. El Libro Informático del Residente de Medicina Interna es un programa que ha sido validado para cuantificar la adquisición de competencias durante el periodo de formación en Medicina Interna. Objetivos. Este estudio se propone analizar las características de las rotaciones durante la formación en Medicina Interna e identificar las variables asociadas con la adquisición de competencias clínicas y comunicativas, la consecución de los objetivos docentes y la satisfacción del residente. Métodos. Participaron todos los residentes de nuestro servicio (n=20) durante un período de 40 meses. El Libro Informático del Residente de Medicina Interna está constituido por 22 cuestionarios de autoevaluación específicos para cada período de rotación, con ítems referentes a las características de los servicios dónde se desarrolló la rotación y a los resultados docentes (competencia clínica y comunicativa, consecución de los objetivos docentes y satisfacción global). Resultados. La dedicación asistencial intensa, con elevada responsabilización del residente y la protocolización se asociaron a una mayor adquisición de competencias clínicas. Una elevada competencia clínica y el trabajo en equipo se asociaron a mejores resultados en habilidades comunicativas. Finalmente, un entorno facilitador para el aprendizaje se asoció a mayor competencia clínica, mayor consecución de los objetivos docentes y mayor satisfacción global. Conclusiones. Diversos factores relacionados con el funcionamiento de los servicios influyeron de forma significativa en la adquisición de competencias, la consecución de los objetivos docentes y la satisfacción de los médicos residentes durante la formación especializada en Medicina Interna (AU)
Background. The Computer Book of the Internal Medicine resident (CBIMR) is a computer program that was validated to analyze the acquisition of competences in teams of Internal Medicine residents. Objectives. To analyze the characteristics of the rotations during the Internal Medicine residency and to identify the variables associated with the acquisition of clinical and communication skills, the achievement of learning objectives and resident satisfaction. Methods. All residents of our service (n=20) participated in the study during a period of 40 months. The CBIMR consisted of 22 self-assessment questionnaires specific for each rotation, with items on services (clinical workload, disease protocolization, resident responsibilities, learning environment, service organization and teamwork) and items on educational outcomes (acquisition of clinical and communication skills, achievement of learning objectives, overall satisfaction). Associations between services features and learning outcomes were analyzed using bivariate and multivariate analysis. Results. An intense clinical workload, high resident responsibilities and disease protocolization were associated with the acquisition of clinical skills. High clinical competence and teamwork were both associated with better communication skills. Finally, an adequate learning environment was associated with increased clinical competence, the achievement of educational goals and resident satisfaction. Conclusions. Potentially modifiable variables related with the operation of clinical services had a significant impact on the acquisition of clinical and communication skills, the achievement of educational goals, and resident satisfaction during the specialized training in Internal Medicine (AU)
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Humanos , Masculino , Femenino , Medicina Interna/educación , Medicina Interna , Autoevaluación (Psicología) , Programas de Autoevaluación/métodos , Educación Basada en Competencias/organización & administración , Educación Basada en Competencias/normas , Educación Basada en Competencias/métodos , Educación Basada en Competencias/tendencias , Competencia Clínica/estadística & datos numéricos , Competencia Clínica/normas , Internado y Residencia/organización & administración , Internado y Residencia/normasRESUMEN
BACKGROUND: The Computer Book of the Internal Medicine resident (CBIMR) is a computer program that was validated to analyze the acquisition of competences in teams of Internal Medicine residents. OBJECTIVES: To analyze the characteristics of the rotations during the Internal Medicine residency and to identify the variables associated with the acquisition of clinical and communication skills, the achievement of learning objectives and resident satisfaction. METHODS: All residents of our service (n=20) participated in the study during a period of 40 months. The CBIMR consisted of 22 self-assessment questionnaires specific for each rotation, with items on services (clinical workload, disease protocolization, resident responsibilities, learning environment, service organization and teamwork) and items on educational outcomes (acquisition of clinical and communication skills, achievement of learning objectives, overall satisfaction). Associations between services features and learning outcomes were analyzed using bivariate and multivariate analysis. RESULTS: An intense clinical workload, high resident responsibilities and disease protocolization were associated with the acquisition of clinical skills. High clinical competence and teamwork were both associated with better communication skills. Finally, an adequate learning environment was associated with increased clinical competence, the achievement of educational goals and resident satisfaction. CONCLUSIONS: Potentially modifiable variables related with the operation of clinical services had a significant impact on the acquisition of clinical and communication skills, the achievement of educational goals, and resident satisfaction during the specialized training in Internal Medicine.
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Competencia Clínica , Medicina Interna/educación , Autoevaluación (Psicología) , Computadores , Evaluación Educacional , Humanos , Internado y Residencia , AprendizajeRESUMEN
OBJECTIVES: Gait and movement abnormalities are traditionally considered infrequent in patients with mild/moderate Alzheimer's disease (AD). However, an increased risk of falls and gait abnormalities has been detected, even in early stages of the disease. Whether these abnormalities are associated with cerebrovascular disease, which has a high prevalence in AD, remains unclear. DESIGN: Cross-sectional study. SETTING: Dementia outpatient clinics. PARTICIPANTS: 24 mild/moderate AD patients with (AD+CVD) and 20 without (AD-CVD) cerebrovascular disease without a history of stroke and antipsychotic medications. MEASUREMENTS: Physical performance, measured with the short physical performance battery [SPPB], a summary measure combining 4-meter gait speed, balance and muscle strength, and with 8-meter gait speed with a turn was compared between the two groups. RESULTS: AD+CVD patients showed a significant higher prevalence of 4-meter gait speed slower than 0.8 m/s (37.5% vs. 5%, p-value=0.01) and balance impairment (37.5% vs. 10%, p-value=0.038), as well as a slower 8-meter gait speed with a turn (mean+SD=0.6±0.2 vs. 0.8±0.2, p-value=0.024). These associations were confirmed in multivariable models. No differences were observed for muscle strength. CONCLUSION: In our sample, AD with cerebrovascular disease had worse gait and balance than AD without cerebrovascular disease. If confirmed, these results may have clinical implications, since cerebrovascular disease can be potentially prevented.
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Enfermedad de Alzheimer/complicaciones , Enfermedad de Alzheimer/fisiopatología , Trastornos Cerebrovasculares/complicaciones , Trastornos Cerebrovasculares/fisiopatología , Marcha/fisiología , Anciano , Anciano de 80 o más Años , Estudios Transversales , Femenino , Humanos , Masculino , Actividad Motora/fisiología , Equilibrio Postural , PrevalenciaRESUMEN
Antecedentes. No se dispone de instrumentos de evaluación de la formación de especialistas que sean simples y estén validados. Objetivos. Analizar la fiabilidad y validez de un método informático de autoevaluación para cuantificar la adquisición de competencias en la formación de especialistas en Medicina Interna. Métodos. Participaron todos los residentes de nuestro servicio durante un período de 28 meses. Se diseñaron 22 cuestionarios de autoevaluación específicos para cada rotación (Libro Informático del Residente de Medicina Interna) con ítems (preguntas) correspondientes a 3 dominios competenciales: competencias clínicas, habilidades comunicativas y competencia para el trabajo en equipo. La fiabilidad se analizó comprobando la consistencia interna de los ítems mediante alfa de Cronbach. La validación se efectuó mediante comparación de medias entre valores observados en residentes senior y junior. Asimismo, se establecieron unos niveles de corte en los valores de competencias para identificar fortalezas y debilidades de nuestro sistema formativo. Finalmente, se correlacionaron los valores de autoevaluación con las evaluaciones de los médicos de plantilla. Resultados. Se observó una elevada consistencia interna de los ítems de competencias clínicas, habilidades comunicativas y trabajo en equipo. Los valores de competencias clínicas y habilidades comunicativas, pero no los de trabajo en equipo, fueron significativamente más elevados en los residentes senior que en los junior. Asimismo, el Libro Informático del Residente de Medicina Interna permitió identificar las fortalezas y debilidades de nuestro sistema formativo. No se observó correlación entre los resultados de la autoevaluación y la evaluación de los médicos de plantilla. Conclusiones. Los ítems del Libro Informático del Residente de Medicina Interna ofrecieron una elevada consistencia interna y permitieron comprobar la adquisición de competencias clínicas y comunicativas en un equipo de residentes de Medicina Interna. Este método de autoevaluación debe complementarse con otros instrumentos para evaluar la adquisición de competencias por un residente individual(AU)
Background. There are no simple and validated instruments for evaluating the training of specialists. Objectives. To analyze the reliability and validity of a computerized self-assessment method to quantify the acquisition of medical competences during the Internal Medicine residency program. Methods. All residents of our department participated in the study during a period of 28 months. Twenty-two questionnaires specific for each rotation (the Computer-Book of the Internal Medicine Resident) were constructed with items (questions) corresponding to three competence domains: clinical skills competence, communication skills and teamwork. Reliability was analyzed by measuring the internal consistency of items in each competence domain using Cronbach's alpha index. Validation was performed by comparing mean scores in each competence domain between senior and junior residents. Cut-off levels of competence scores were established in order to identify the strengths and weaknesses of our training program. Finally, self-assessment values were correlated with the evaluations of the medical staff. Results. There was a high internal consistency of the items of clinical skills competences, communication skills and teamwork. Higher scores of clinical skills competence and communication skills, but not in those of teamwork were observed in senior residents than in junior residents. The Computer-Book of the Internal Medicine Resident identified the strengths and weaknesses of our training program. We did not observe any correlation between the results of the self- evaluations and the evaluations made by staff physicians. Conclusions. The items of Computer-Book of the Internal Medicine Resident showed high internal consistency and made it possible to measure the acquisition of medical competences in a team of Internal Medicine residents. This self-assessment method should be complemented with other evaluation methods in order to assess the acquisition of medical competences by an individual resident(AU)
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Humanos , Masculino , Femenino , Internado y Residencia/métodos , Internado y Residencia/estadística & datos numéricos , Autoevaluación (Psicología) , Programas de Autoevaluación/métodos , Medicina Interna/educación , Medicina Interna , Medicina Interna/estadística & datos numéricos , Competencia Clínica/estadística & datos numéricos , Competencia Clínica/normas , Alfabetización Informacional , Encuestas y Cuestionarios , Alfabetización Digital/estadística & datos numéricos , Informática Médica/educación , Informática Médica/métodos , Informática Médica/tendencias , Reproducibilidad de los Resultados/métodosRESUMEN
BACKGROUND: There are no simple and validated instruments for evaluating the training of specialists. OBJECTIVES: To analyze the reliability and validity of a computerized self-assessment method to quantify the acquisition of medical competences during the Internal Medicine residency program. METHODS: All residents of our department participated in the study during a period of 28 months. Twenty-two questionnaires specific for each rotation (the Computer-Book of the Internal Medicine Resident) were constructed with items (questions) corresponding to three competence domains: clinical skills competence, communication skills and teamwork. Reliability was analyzed by measuring the internal consistency of items in each competence domain using Cronbach's alpha index. Validation was performed by comparing mean scores in each competence domain between senior and junior residents. Cut-off levels of competence scores were established in order to identify the strengths and weaknesses of our training program. Finally, self-assessment values were correlated with the evaluations of the medical staff. RESULTS: There was a high internal consistency of the items of clinical skills competences, communication skills and teamwork. Higher scores of clinical skills competence and communication skills, but not in those of teamwork were observed in senior residents than in junior residents. The Computer-Book of the Internal Medicine Resident identified the strengths and weaknesses of our training program. We did not observe any correlation between the results of the self- evaluations and the evaluations made by staff physicians. CONCLUSIONS: The items of Computer-Book of the Internal Medicine Resident showed high internal consistency and made it possible to measure the acquisition of medical competences in a team of Internal Medicine residents. This self-assessment method should be complemented with other evaluation methods in order to assess the acquisition of medical competences by an individual resident.
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Competencia Clínica , Medicina Interna/educación , Internado y Residencia , Autoevaluación (Psicología) , Encuestas y Cuestionarios , Humanos , Reproducibilidad de los Resultados , EspañaRESUMEN
The aim of this study was to assess the following parameters in prepubertal goat oocytes of different follicle diameter (> or =3 mm, <3 mm, control): oocyte diameter, early (Annexin-V) and late (TUNEL) apoptosis, embryo development and chromosomal ploidy of these blastocysts using Fluorescence In Situ Hybridization (FISH). Before in vitro maturation, oocytes were measured and stained with Annexin-V or TUNEL. The rest of the oocytes were matured, fertilized, and cultured in vitro for 8 days. Oocytes from follicles of > or =3 mm showed greater mean oocyte diameter (128.27 +/- 7.20 microm vs. 125.35 +/- 7.59 microm), higher percentages of TUNEL positive (42.86 vs. 24.23%), higher cleavage (47.85 +/- 3.98 vs. 23.07 +/- 2.44 %) and blastocyst rates (19.77 +/- 3.04 vs. 4.11 +/- 1.10 %) than oocytes from follicles of <3 mm.. Blastocyst mean cell numbers did not show differences between follicular groups (123.83 +/- 49.62 vs. 104.29 +/- 36.09 for follicles of > or =3 mm and <3 mm, respectively). A total of 54 blastocysts with 7084 nuclei were hybridized with specific probes to chromosomes X and Y. Ninety-eight percent (98%) of the embryos presented at least one cell carrying an abnormal number of chromosomes, but 78% of them presented less than 25% of chromosomal abnormal cells. No differences in the percentage of blastocysts with abnormal ploidy were found in embryos produced from oocytes of different follicle diameter.
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Apoptosis , Desarrollo Embrionario , Cabras/embriología , Oocitos/citología , Folículo Ovárico/anatomía & histología , Ploidias , Animales , Cromosomas de los Mamíferos , Embrión de Mamíferos/citología , Femenino , Cabras/genética , Cabras/crecimiento & desarrollo , Maduración SexualRESUMEN
The aim of this work was to investigate chitosomes, i.e. liposomes coated by a polyelectrolyte complex between chitosan (CH) and xantan gum (XG), as potential delivery system for oral administration of the protein C-phycocyanin. To this purpose several CH-XG-microcomplexes were prepared in aqueous lactic acid at different chitosan-xanthan gum percent ratios and rheological properties of the microcomplexes were studied to analyse the contribution of chitosan and xanthan gum in the reaction of microcomplexation. After establishing the best microcomplexes, chitosomes were prepared by coating C-phycocyanin loaded liposomes with the CH-XG hydrogels using spray-drying or freeze-drying. The chitosomes were characterized in terms of morphology, size distribution, zeta potential, swelling properties, drug release, and mucoadhesive properties. Rheological studies showed the influence of xanthan gum in the microcomplex properties. Moreover, obtained results demonstrated the effects of formulation and process variables on particle size, drug content, swelling, drug release, and especially on the mucoadhesiveness of C-PC chitosomes of CH-XG. In particular, chitosomes prepared by spray-drying technique using CH-XG in 0.5/8.0 (w/w) ratio showed a regular surface and a drug release characteristic for a Fickian diffusion of the active ingredient. The in vitro mucoadhesive study revealed that the spray-drying method is advantageous to prepare C-phycocyanin loaded chitosomes with excellent mucoadhesive properties for colonic drug delivery.
Asunto(s)
Quitosano/química , Sistemas de Liberación de Medicamentos/métodos , Ficocianina/administración & dosificación , Polisacáridos Bacterianos/química , Animales , Preparaciones de Acción Retardada , Composición de Medicamentos , Elasticidad , Hidrogeles , Técnicas In Vitro , Mucosa Intestinal/metabolismo , Liposomas , Microscopía Electrónica de Rastreo , Modelos Biológicos , Tamaño de la Partícula , Ficocianina/farmacocinética , Ratas , Ratas Wistar , Reología , Solubilidad , Propiedades de Superficie , ComprimidosRESUMEN
BACKGROUND: Nowadays, oocyte donation is an extended practise in IVF programmes. However, to date, little information on aneuploidy frequency in oocytes from donors is available. Aneuploidy is one of the major causes of embryo and fetal wastage as well as of congenital mental and developmental disabilities. It is known that most aneuploidies are due to non-disjunction events occurring in the maternal germ line. Linkage studies have associated abnormal patterns of meiotic recombination to the origin of the non-disjunction event in many aneuploid conditions. METHODS AND RESULTS: In the present study, we analyse the frequency of chromosome imbalances in a series of metaphase I (MI; n = 44) and metaphase II (MII; n = 103) oocytes from 140 young donors (aged from 18 to 35 years, mean age 26.6) after hormone-induced superovulation. The aneuploidy frequency found in MII oocytes was 12.6%, and both whole-chromosome non-disjunction (1.94%) and premature separation of sister chromatids (PSSC) (12.6%) have been found. The chromosomes involved have been identified by multiplex fluorescent in situ hybridization (FISH). Achiasmate chromosomes have been identified in MI oocytes (9.1%), with most of them corresponding to chromosome 16 (6.8%). For this reason, the meiotic recombination pattern of chromosome 16 has been analysed in prophase I oocytes (n = 81) by immunofluorescence staining against MLH1 protein and subsequent FISH with specific probes. Our results show a percentage of oocytes with non-crossover bivalent 16 (2.5%) and a high percentage of bivalents 16 with a single exchange (19.8%). CONCLUSIONS: In the present study, we report the finding of a considerable frequency of aneuploidy in oocytes from young donors, with the frequency of PSSC being higher than the frequency of whole-chromosome non-disjunction. In addition, we report vulnerable patterns of meiotic recombination in chromosome 16 that may be at risk of leading to a non-disjunction event. This gives new data on the susceptibility of the control population to conceive a trisomic 16 embryo.
Asunto(s)
Cromosomas Humanos Par 16 , No Disyunción Genética , Oocitos/citología , Trisomía/genética , Adolescente , Adulto , Análisis Citogenético , Femenino , Humanos , Hibridación Fluorescente in Situ , Meiosis/fisiología , Inducción de la Ovulación , Recombinación GenéticaRESUMEN
OBJECTIVE: To identify analytical and clinical variables that may improve the effectiveness of temporal artery biopsy (TAB) for the diagnosis of giant cell arteritis (GCA). MATERIALS AND METHODS: A retrospective study of TABs conducted between 1989 and 2007 at the 450-bed Hospital Parc Taulí, Sabadell. Demographic data, clinical manifestations, analytical data prior to the biopsy and final diagnoses were recorded, including only those cases in which these data were reflected in the clinical history. RESULTS: In this period, 278 TABs were conducted in 181 women (65.1%) and 97 men (mean age 74 years). Seventy-nine (28.4%) were positive (GCA+) and 199 (71.5%) negative (TAB-). The most frequent final diagnoses in the TAB- group were: polymyalgia rheumatica (PMR) (18.6%), giant cell arteritis plus negative TAB (GCA-) (13.6%), tension headache (7.5%), infection (7.5%), other vasculitis (7.5%), and neoplasm (6.0%). The GCA+ group was compared with the TAB- group, the GCA- group and the PMR group. In the multivariate analysis only headache (RR 3.6), jaw claudication (RR 2.9) and abnormal temporal artery on palpation (RR 2.5) revealed statistical differences between the GCA+ and TAB- groups. CONCLUSION: One third of the biopsies performed at our centre were positive for GCA. The clinical variables that best predicted a positive TAB in our series were headache, jaw claudication, and abnormal temporal artery on palpation.