RESUMEN
The increasing application of Quantum Dots (QDs) is cause of concern for the potential negative effects for the ecosystem, especially in soils that may act as a sink. In this study, soil leaching experiments were performed in quartz sand packed columns to investigate the behavior of core-shell CdSe/ZnS QDs coated with either small ligands (TGA-QDs) or more complex polymers (POAMA-QDs). Fluorescence emission was compared to mass spectrometric measurements to assess the nanoparticles (NPs) state in both the leachate (transported species) and porous media (deposited amounts). Although both QDs were strongly retained in the column, large differences were observed depending on their capping ligand stability. Specifically, for TGA-QDs elution was negligible and the retained fraction accumulated in the top-columns. Furthermore, 74% of the NPs were degraded and 38% of the Se was found in the leachate in non-NPs state. Conversely, POAMA-QDs were recovered to a larger extent (78.1%), and displayed a higher transport along the soil profile. Further experiments with altered NPs showed that homo-aggregation of the QDs prior injection determined a reduced mobility but no significant changes in their stability. Eventually, ageing of the NPs in the column (15 days) caused the disruption of up to 92% of the original QDs and the immobilization of NPs and metals. These results indicate that QDs will accumulate in top-soils, where transformations phenomena will determine the overall transport, persistency and degradation of these chemicals. Once accumulated, they may act as a source for potentially toxic Cd and Se metal species displaying enhanced mobility.
Asunto(s)
Puntos Cuánticos , Contaminantes del Suelo/análisis , Compuestos de Cadmio/química , Ecosistema , Ligandos , Nanopartículas , Compuestos de Selenio/química , Suelo/química , Sulfuros , Compuestos de ZincRESUMEN
Quantitative approaches are part of the understanding of contour integration and the Gestalt law of good continuation. The present study introduces a new quantitative approach based on the a contrario theory, which formalizes the non-accidentalness principle for good continuation. This model yields an ideal observer algorithm, able to detect non-accidental alignments in Gabor patterns. More precisely, this parameterless algorithm associates with each candidate percept a measure, the Number of False Alarms (NFA), quantifying its degree of masking. To evaluate the approach, we compared this ideal observer with the human attentive performance on three experiments of straight contours detection in arrays of Gabor patches. The experiments showed a strong correlation between the detectability of the target stimuli and their degree of non-accidentalness, as measured by our model. What is more, the algorithm's detection curves were very similar to the ones of human subjects. This fact seems to validate our proposed measurement method as a convenient way to predict the visibility of alignments. This framework could be generalized to other Gestalts.
Asunto(s)
Atención/fisiología , Percepción de Forma/fisiología , Reconocimiento Visual de Modelos/fisiología , Adulto , Algoritmos , Femenino , Teoría Gestáltica , Humanos , Masculino , Persona de Mediana Edad , Modelos Teóricos , Enmascaramiento Perceptual , Estimulación Luminosa/métodos , Psicofísica , Adulto JovenRESUMEN
The extensive loss of skin in burned patients is a critical clinical condition, and the choice of an effective technique to cover and protect the damaged area has always been a challenge in the surgical field. Despite its wide clinical use, there is little data in the literature on using the Alexander technique to treat severe burns, while several studies have focused on alternative approaches. The present study aims to evaluate the effectiveness of the Alexander surgical technique on 117 patients with severe burns. The characteristics of the burned patients, factors related to etiology of burns as well as adverse prognostic factors and their incidence in discharged versus deceased patients were also taken into account. Finally, a comparison is made with an alternative surgical procedure described in the literature. Our results show a satisfactory level of survival for patients with severe burns surgically treated with the Alexander technique, accounting for 63% of all clinical cases reported here. This treatment is also less expensive and more rapid than the alternative approach we compared it with. The Alexander technique is a lifesaving method for the treatment of severe burns that provides a satisfactory chance of survival at lower cost than the alternative surgical procedure examined.
Une vaste perte de substance cutanée chez les brûlés détermine un état clinique critique, et le choix d'une technique efficace pour couvrir et protéger les zones détruites a toujours été un challenge chirurgical. Malgré sa large utilisation, il y a peu de références dans la littérature sur l'utilisation de la technique d'Alexander dans le traitement les brûlures graves, alors que différentes études insistent sur d'autres approches. Cette étude a pour but d'évaluer l'efficacité de la technique chirurgicale d'Alexander sur 117 patients présentant des brûlures graves. Les caractéristiques de ces brûlés (étiologie, facteurs pronostiques défavorables et leur incidence sur la sortie de l'hôpital) ont été prises en compte, comme celles des patients décédés. Enfin, la comparaison est faite avec les autres procédés alternatifs chirurgicaux décrits dans la littérature. Nos résultats montrent un taux satisfaisant de survie chez les patients présentant des brûlures graves traitées par la technique d'Alexander: 63% de tous les cas cliniques rassemblés ici. Le traitement est aussi moins cher et plus rapide que dans les techniques alternatives. La technique d'Alexander est une méthode de sauvetage pour le traitement des brûlures graves qui offre une chance satisfaisante de survie à un coût moindre que les autres techniques alternatives.
RESUMEN
Systematic education based on internationally standardized programs is a well-established practice in Italy, especially in the emergency health care system. However, until recently, a specific program to treat burns was not available to guide emergency physicians, nurses, or volunteers acting as first responders. In 2010, two national faculty members, acting as ABA observers, and one Italian course coordinator, trained and certified in the United States, conducted a week-long training program which fully certified 10 Italian instructors. Authorized ABLS provider courses were conducted in Italy between 2010 and 2012, including one organized prior to the 20th annual meeting of the Italian Society of Burns (SIUst). In order to increase the effectiveness and diffusion of the course in Italy, changes were approved by the ABA to accommodate societal differences, including the translation of the manual into Italian. The ABA has also approved the creation and publication of a bilingual ABLS Italian website for the purpose of promoting the ABLS course in Italy. In response to high demand, a second ABLS Instructor course was organized in 2012 and has been attended by physicians and nurses from several Italian burn centers. In the following discourse the experiences of the first 15 Italian ABLS courses will be discussed.
Asunto(s)
Atención de Apoyo Vital Avanzado en Trauma/métodos , Quemaduras/terapia , Educación Médica Continua/métodos , Educación Continua en Enfermería/métodos , Medicina de Emergencia/educación , Enfermería de Urgencia/educación , Unidades de Quemados , Primeros Auxilios , Humanos , Italia , Cuidados para Prolongación de la Vida/métodosRESUMEN
The aim of the study was to evaluate atherosclerosis in ankylosing spondylitis (AS) through the assessment of morphological and functional measures of subclinical atherosclerosis. Twenty patients [M/F=12/8, age (median/range) 43.5/28-69 years; disease duration (median/range) 9.7/1-36) years] with AS classified according to modified New York criteria and twenty age and sex related healthy controls with negative past medical history for cardiovascular events were enrolled in the study. In all patients and controls, the intima-media thickness (IMT) of common carotid artery, carotid bulb and internal carotid artery, and the flow-mediated dilatation (FMD) of non-dominant arm brachial artery were determined, using a sonographic probe Esaote GPX (Genoa, Italy). Furthermore, we assess the main disease activity and disability indices [bath ankylosing spondylitis disease activity index, ankylosing spondylitis disease activity score-eritrosedimentation rate (ASDAS-ESR), ASDAS-C-reactive protein (CRP), bath ankylosing spondylitis metrology index, bath ankylosing spondylitis functional index) and acute phase reactants. Plasmatic values of total cholesterol, low-density lipoprotein, high-density lipoprotein, triglyceride and homocysteine were carried out in all twenty patients. IMT at carotid bulb was significant higher in patients than in controls (0.67 mm vs 0.54 mm; P=0.03). FMD did not statistically differ between patients and controls (12.5% vs 15%; P>0.05). We found a correlation between IMT at carotid bulb and ESR (rho 0.43; P=0.04). No correlation was found between FMD and disease activity and disability indices. This study showed that in AS patients, without risk factors for cardiovascular disease, carotid bulb IMT, morphological index of subclinical atherosclerosis, is higher than in controls.
Asunto(s)
Aterosclerosis/etiología , Espondilitis Anquilosante/complicaciones , Adulto , Anciano , Aterosclerosis/patología , Arteria Braquial/patología , Grosor Intima-Media Carotídeo , Dilatación Patológica , Femenino , Humanos , Masculino , Persona de Mediana Edad , Índice de Severidad de la EnfermedadRESUMEN
In axial spondyloarthritis (SpA), the efficacy of certolizumab pegol (CZP), a novel pegylated anti-tumor necrosis factor alpha drug has not been investigated. We report that CZP showed a rapid effectiveness, assessed clinically and by magnetic resonance imaging, in a patient with a non-radiographic axial SpA, classified according to Assessment in SpondyloArthritis International Society (ASAS) criteria. This case suggests that CZP could be considered an useful treatment in non-radiographic axial SpA, supporting that an earlier therapeutic approach could play a relevant role in the management of the disease.
Asunto(s)
Anticuerpos Monoclonales Humanizados/uso terapéutico , Fragmentos Fab de Inmunoglobulinas/uso terapéutico , Inmunosupresores/uso terapéutico , Polietilenglicoles/uso terapéutico , Espondiloartritis/tratamiento farmacológico , Certolizumab Pegol , Femenino , Humanos , Imagen por Resonancia Magnética , Inducción de Remisión , Espondiloartritis/diagnóstico , Factores de Tiempo , Adulto JovenRESUMEN
BACKGROUND: Frontal sinus fractures peculiarity is that a wrong treatment not only could it encompass functional or aesthetical problems but also more dangerous complications: the proximity of the frontal bone to the brain, on a side, and to the nasolacrimal duct, on the other side, and therefore to the nasal cavity, lead the traumatisms occurring within this region to be at high risk of infections. MATERIALS AND METHODS: We report our experience on 132 cases of frontal sinus fracture treated from 1989 to 2005 and to present the surgical techniques performed as well as to compare the complications they reported over time to the International Literature data. 101 patients (76.5%) were treated in order to reduce and contain the isolated fractures involving the frontal sinus anterior wall, the patients presenting associated fractures of the frontal sinus anterior and posterior wall were 28 (21.2%), while the cases reporting isolated fractures of the nasolacrimal duct were 3. RESULTS: Our patients underwent follow-ups from 1 to 16 years long. We subdivided the complications found in our group into infectious and functional so that the incidence of the complications related to the sites and the treatment performed according to the specific case could be better assessed. In conclusion, the infectious and functional complications found were treated with a multidisciplinary study considering the approach to the craniofacial traumatized person is subordinated to the co-existence of general and neurological conditions requiring for their resolution different approaches and times.
Asunto(s)
Seno Frontal/lesiones , Seno Frontal/cirugía , Fracturas Craneales/cirugía , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Lesiones Encefálicas/complicaciones , Femenino , Seno Frontal/diagnóstico por imagen , Humanos , Masculino , Persona de Mediana Edad , Cavidad Nasal/lesiones , Complicaciones Posoperatorias , Radiografía , Fracturas Craneales/complicaciones , Fracturas Craneales/diagnóstico por imagen , Resultado del TratamientoRESUMEN
Ischemia/reperfusion injury is regarded as the main cause of failure in revascularization of limbs and transfer of free flaps in the so called nonreflow phenomenon. This type of damage is caused by the production of free radicals, above all, of neutrophils that release great quantities of extracellular superoxide through the action of a membrane enzyme. In our study we used 40 white rabbits. Rabbit rectus femoris muscle is perfused by a single artery and vein and is therefore a valuable model for study of ischemia-induced reperfusion injury of skeletal muscle. The objective of this study was to individualize a valid method of protection for the muscle from damage by ischemia-induced reperfusion injury. We have tested the effectiveness of WEB2170, a PAF antagonist, of hyperbaric oxygen therapy one (HBO), and of combined employment of WEB2170 and HBO. The results show that both PAF and HBO play important protective roles against damage from ischemia/reperfusion injury, and that the combined employment of both therapies has a synergistic effect. We propose therefore a new therapeutic protocol for the prevention of damage resulting from ischemia/reperfusion injury with the simultaneous employment of this PAF and HBO.
Asunto(s)
Azepinas/uso terapéutico , Oxigenoterapia Hiperbárica , Inhibidores de Agregación Plaquetaria/uso terapéutico , Daño por Reperfusión/prevención & control , Triazoles/uso terapéutico , Animales , Terapia Combinada , Modelos Animales de Enfermedad , Músculo Esquelético/irrigación sanguínea , Peroxidasa/metabolismo , ConejosRESUMEN
BACKGROUND: The reduction in plasma cholesterol with increase in large and lower dense LDL (pattern A) obtained by statins is usually associated with a prompt reduction in cardiovascular risk, but after bariatric surgery for morbid obesity a delay of some years is observed. No data regarding LDL pattern are available in obese subjects after biliopancreatic surgery. OBJECTIVE: To evaluate the modifications in LDL composition and LDL density after biliopancreatic surgery. SUBJECTS: 29 patients (17 type 2 diabetics (type 2) and 12 non-diabetics (ND)) with BMI <35, who failed previous attempts to decrease weight by diet, were studied before and 6 months after biliopancreatic diversion for morbid obesity. MEASUREMENTS: In all subjects, besides fasting circulating lipids, glucose and insulin, LDL and VLDL composition were determined and LDL density was evaluated as well. RESULTS: After surgery we observed a significant reduction of all circulating lipids, including apolipoprotein (Apo) B. The decrease was more marked for total cholesterol (-41%) than for triglycerides (-28%), without a significant difference between type 2 and ND. After surgery, LDL presented a marked decrease in the percentage of cholesterol (from 36 to 32%) with a marked increase in the percentage of triglycerides (from 13 to 18%), without appreciable modification of ApoB. After surgery, 1 patient changed from pattern B to A, while 2 patients previously pattern A became pattern B. Also a decrease in HDL and ApoAI was evident in all the subjects with an increase in the VLDL-1. CONCLUSIONS: Our data indicate that after biliopancreatic diversion, the plasma lipid profile improves along with improvement of plasma glucose and insulin sensitivity, but the LDLs become richer in triglycerides. It is possible that the greater atherogenicity of these LDLs is compensated by an improvement in the general metabolic condition.
Asunto(s)
Desviación Biliopancreática , LDL-Colesterol/sangre , Lípidos/sangre , Lipoproteínas/sangre , Obesidad Mórbida/sangre , Apolipoproteínas B/sangre , VLDL-Colesterol/sangre , Diabetes Mellitus/sangre , Femenino , Humanos , Masculino , Persona de Mediana Edad , Obesidad , Obesidad Mórbida/cirugía , Tamaño de la Partícula , Periodo PosoperatorioRESUMEN
Bell palsy is a condition resulting from a peripheral edematous compression on the nervous fibers of the facial nerve. This pathological condition often has clinical characteristics of no importance and spontaneously disappears in a short time in a high percentage of cases. Facial palsy concerning cranial nerve VII can also be caused by other conditions such as mastoid fracture, acoustic neurinoma, tumor spread to the temporal lobe (e.g., cholesteatoma), neoformation of the parotid gland, Melkersson-Rosenthal syndrome, and Ramsay-Hunt syndrome. Therefore, it is important to adopt an accurate diagnostic technique allowing the rapid detection of Bell palsy and the exclusion of causes of facial paralysis requiring surgical treatment. Magnetic resonance imaging (MRI) with medium contrast of the skull shows a marked increase in revealing lesions, even of small dimensions, inside the temporal bone and at the cerebellopontine angle. The authors present a clinical case to show the important role played by gadolinium MRI in reaching a diagnosis of Bell palsy in the differential diagnosis of the various conditions that determine paralysis of the facial nerve and in selecting the most suitable treatment or surgery to be adopted.
Asunto(s)
Parálisis de Bell/diagnóstico , Medios de Contraste , Gadolinio , Angiografía por Resonancia Magnética , Adulto , Parálisis de Bell/fisiopatología , Diagnóstico Diferencial , Nervio Facial/irrigación sanguínea , Nervio Facial/fisiopatología , Enfermedades del Nervio Facial/diagnóstico , Parálisis Facial/diagnóstico , Humanos , Planificación de Atención al PacienteRESUMEN
BACKGROUND: The Sardinian population is genetically homogeneous and could be useful in understanding better the genetics of a complex disease like breast cancer (BC). PATIENTS AND METHODS: Using a screening assay based on a combination of single-strand conformation polymorphism, denaturing high-performance liquid chromatography and sequence analysis, 47 Sardinian families with three or more BC cases were screened for germline mutations in BRCA1 and BRCA2 genes. RESULTS: Three BRCA1/2 germline sequence variants were identified. While BRCA2-Ile3412Val is a missense variant with unknown functional significance, BRCA2-8765delAG and BRCA1-Lys505ter are two deleterious mutations (due to their predicted effects on protein truncation), which were found in seven families (15%). BRCA2-8765delAG was found in six of eight (75%) BRCA1/2-positive families and seven of 501 (1.4%) unselected and consecutively collected BC patients. Prevalence of BRCA1/2 mutations in BC families was significantly correlated with the total number of female BCs (P <0.01) and increased by the presence of (i) at least one case of ovarian or male BC, or (ii) three generations affected, or (iii) bilateral BC. CONCLUSIONS: Identification of such features should address BC patients and their families to genetic counseling and BRCA1/2 mutational analysis. In addition, this is the first report of a detailed BRCA1/2 mutation screening in Sardinia, having immediate implications for the clinical management of BC families.
Asunto(s)
Neoplasias de la Mama/epidemiología , Neoplasias de la Mama/genética , Genes BRCA1 , Genes BRCA2 , Asesoramiento Genético/normas , Predisposición Genética a la Enfermedad , Mutación de Línea Germinal , Adulto , Anciano , Biomarcadores de Tumor/análisis , Neoplasias de la Mama Masculina/epidemiología , Neoplasias de la Mama Masculina/genética , Análisis Mutacional de ADN , Femenino , Asesoramiento Genético/tendencias , Pruebas Genéticas , Humanos , Incidencia , Italia/epidemiología , Masculino , Persona de Mediana Edad , Linaje , Reacción en Cadena de la Polimerasa/métodos , Polimorfismo Conformacional Retorcido-Simple , Vigilancia de la Población , Factores de Riesgo , Análisis de SupervivenciaRESUMEN
OBJECTIVE: The aim of this study is to report personal experience on the evolution of the therapeutical approach and surgical treatment in 66 patients with fibrous dysplasia (FD) of the cranio-maxillo-facial area. METHODS: From January 1984 to December 1999, 66 cases of FD of the cranio-maxillo-facial area were diagnosed. 21 patients were still growing (under 17 years), while 45 were adults (over 17 years). 50 (75.7%) patients showed FD in monostotic form; 15 (22.7%) patients showed FD in polyostotic form; one (1.51%) patient affected by Mc Cune-Albright Syndrome presented the involvement of the left hemimandible. In 24 (36.3%) patients the clinical onset of the disease was insidious, lacked evident symptomatology and the diagnosis was fortuitous. The remaining 42 (63.6%) patients showed different signs and symptoms according to the location of the pathology. RESULTS: In this time the patients who underwent surgical treatment showed the resolution of the functional and aesthetical problems; the patients who did not undergo surgical treatment, in relation to age and type of pathology, showed an arrest during clinical and radiographic checks. CONCLUSIONS: We have pointed out the importance of a careful differential diagnosis of fibrous dysplasia with other pathologies with clinical and radiographic conditions similar to it and the importance of a correct surgical planning, carried out according to the patient's age, location, mono or polyostotic form of fibrous dysplasia and to the presence or absence of functional limitations, and aesthetic problems. Further-more we have pointed out the great possibilities of reconstruction of the surgical defects deriving from the utilization of autologous bone grafts and the benefits deriving from the introduction of the internal rigid fixation for the stabilization of these grafts in the surgical defects.
Asunto(s)
Huesos Faciales/cirugía , Displasia Fibrosa Monostótica/cirugía , Displasia Fibrosa Poliostótica/cirugía , Cráneo/cirugía , Adolescente , Adulto , Trasplante Óseo , Hilos Ortopédicos , Niño , Diagnóstico Diferencial , Estética , Huesos Faciales/patología , Femenino , Displasia Fibrosa Monostótica/diagnóstico , Displasia Fibrosa Monostótica/patología , Displasia Fibrosa Poliostótica/complicaciones , Displasia Fibrosa Poliostótica/diagnóstico , Displasia Fibrosa Poliostótica/patología , Estudios de Seguimiento , Humanos , Maxilares/patología , Masculino , Procedimientos Quirúrgicos Orales , Procedimientos Quirúrgicos Ortognáticos , Estudios Retrospectivos , Cráneo/patología , Colgajos QuirúrgicosRESUMEN
Ameloblastoma, a benign tumor of odontogenic type, represents 10% of all tumors of the jawbone. It is localized in the mandible in 80% of cases and in the upper jaw in the remaining 20%. In every case, the selection of the surgical treatment to be applied must consider some fundamental elements, including the age and general state of health of the patient, the clinicopathological variant, and the localization and extent of the tumor. In addition, it is necessary to evaluate whether the neoplasm to be treated is a primitive lesion or a recurrence. Although ameloblastoma has relative histological characteristics of benignity, this neoplasm has a high percentage of local recurrence and possible malignant development when treated inadequately. The aim of this study was to carry out a follow-up of 60 patients treated for ameloblastoma of the mandible between 1977 and 1998, analyzing the problems faced in removing this benign neoplasm and those concerning reconstruction of the surgical defect.
Asunto(s)
Ameloblastoma/cirugía , Neoplasias Mandibulares/cirugía , Adulto , Factores de Edad , Ameloblastoma/diagnóstico por imagen , Ameloblastoma/patología , Placas Óseas , Tornillos Óseos , Trasplante Óseo , Hilos Ortopédicos , Femenino , Estudios de Seguimiento , Estado de Salud , Humanos , Italia , Masculino , Mandíbula/cirugía , Neoplasias Mandibulares/diagnóstico por imagen , Neoplasias Mandibulares/patología , Recurrencia Local de Neoplasia/cirugía , Osteotomía/métodos , Parestesia/etiología , Radiografía Panorámica , Estudios Retrospectivos , Infección de la Herida Quirúrgica/etiología , Tomografía Computarizada por Rayos XRESUMEN
BACKGROUND: Bone deficits of the midface can be observed following tumor surgery, facial traumas or malformations, and can determine aesthetic deformities requiring surgical corrections. The goal of this study is to illustrate the 23 years experience of the Maxillo-Facial Department of the "La Sapienza" University of Rome, in surgical correction of middle third bone loss for aesthetic improvement, and to compare postsurgical results from the use of biomaterials and homologous bone grafts. METHODS: From January 1977 to January 2000, 18 patients were surgically treated with bone grafts for bone deficit of the midface requiring aesthetic improvements, and 23 received biomaterial placement in the same district. A retrospective analysis regarding aesthetic improvements following corrective (reconstructive) surgery was carried out in order to compare long-term results obtained with bone grafts and biomaterials. RESULTS: Of the 19 implants of the zygomatic bone, 1 patient suffered from infection, observ-ed on the 8th day, following iliac bone graft in the maxillary area. Of the 32 prostheses, 7 became infected and in 1 case the material became exposed: Proplast(R) became infected 2 times, Gore-tex(R) 3 times and 1 time became exposed; 2 of the 24 Medpor(R) implants resulted in infection. The employment of bone graft obtained a good short term aesthetic result. Medpor(R) employment, was evaluated as an optimal aesthetic improvement. We cannot evaluate the results obtained with Gore-tex(R) and Proplast(R) because of the few cases treated. Anyway we consider unsatisfactory the corrections obtained with these 2 materials. CONCLUSIONS: Homologous bone grafts are still considered as the best choice when a further fixture positioning is planned for prosthetic rehabilitation of the alveolar ridge of the upper jaw or mandible. At the present time, some biomaterials are the definitive solution for restoring facial harmony in the 3 spatial dimensions.
Asunto(s)
Materiales Biocompatibles , Trasplante Óseo/métodos , Huesos Faciales/cirugía , Procedimientos de Cirugía Plástica/métodos , Materiales Biocompatibles/efectos adversos , Trasplante Óseo/efectos adversos , Huesos Faciales/patología , Humanos , Ilion/trasplante , Italia , Maxilar/cirugía , Polietilenos , Politetrafluoroetileno , Proplast , Infecciones Relacionadas con Prótesis/etiología , Procedimientos de Cirugía Plástica/efectos adversos , Estudios Retrospectivos , Trasplante Homólogo , Resultado del Tratamiento , Cigoma/cirugíaRESUMEN
BACKGROUND: In patients with acute profound cardiogenic circulatory failure unresponsive to conventional resuscitation, we instituted immediate aggressive application of extracorporeal membrane oxygenation (ECMO) to restore circulatory stability. Long-term hemodynamic support was accomplished with an early "bridge" to ventricular assist device (VAD) before definitive treatment with cardiac transplantation. METHODS: A respective review of ECMO and VAD data registries was instituted. RESULTS: From May 1996 to July 2000, 23 patients were placed on ECMO support for profound cardiogenic circulatory failure. Eleven patients (47%) were withdrawn from support due to severe neurologic injury or multisystem organ failure. Three patients (13%) were weaned off ECMO with good outcome. Nine patients (39%) were transferred to a VAD. Two patients expired while on VAD support, and 7 of the VAD-supported patients (78%) survived to transplantation. Overall survival was 43%. CONCLUSIONS: Emergent ECMO support is a salvage approach for cardiac resuscitation once conventional measures have failed. In neurologically intact patients, the early transfer to a VAD quickly stabilizes hemodynamics, avoids complications, and is essential for long-term circulatory support before definitive treatment with cardiac transplantation.
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Reanimación Cardiopulmonar , Oxigenación por Membrana Extracorpórea , Trasplante de Corazón , Corazón Auxiliar , Choque Cardiogénico/cirugía , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Mortalidad Hospitalaria , Humanos , Masculino , Persona de Mediana Edad , Examen Neurológico , Sistema de Registros , Estudios Retrospectivos , Choque Cardiogénico/mortalidad , Tasa de Supervivencia , Resultado del TratamientoRESUMEN
Adolescents represent the fastest growing segment of HIV+ individuals in the United States. Therefore, high school teachers should be both knowledgeable of and comfortable with issues related to HIV/AIDS. This study examined high school teachers' AIDS-related knowledge and attitudes. One hundred forty-one high school teachers from nine central Massachusetts high schools participated. Participants completed the "HIV/AIDS Knowledge and Attitudes Scales for Teachers," as well as questions regarding their teaching experience and academic disciplines. Results indicated a direct relationship between teachers' knowledge of HIV/AIDS and positive or supportive attitudes toward HIV/AIDS. Significant differences were found based on academic discipline, with allied health teachers scoring significantly higher on the knowledge scale than teachers in any other discipline. Specific examples are discussed, as is the need for increased teacher training and comprehensive AIDS education.
Asunto(s)
Síndrome de Inmunodeficiencia Adquirida , Docentes/estadística & datos numéricos , Conocimientos, Actitudes y Práctica en Salud , Síndrome de Inmunodeficiencia Adquirida/psicología , Adolescente , Femenino , Humanos , Masculino , Massachusetts , Instituciones Académicas , Factores Sexuales , Apoyo SocialRESUMEN
BACKGROUND: Experimental evidence indicates that statins might have direct vascular effects independently from low-density lipoprotein (LDL) cholesterol reduction and we reported that the reduction in urinary albumin excretion rate during Simvastatin treatment in type 2 diabetic patients was not correlated with LDL-cholesterol decrease. However in humans there are no data regarding possible additional effects of Simvastatin on blood pressure and urinary albumin excretion beyond its capacity to lower serum cholesterol. PATIENTS AND METHODS: Twenty-six microalbuminuric hypertensive type 2 diabetic patients (diastolic blood pressure - after four months wash-out from the previous antihypertensive therapy - consistently > 90 and < 100 mmHg; plasma LDL-cholesterol > 3.9 and < 6.5 mmol L-1) were enrolled in the study. In random order, these patients received Simvastatin (20 mg day-1) or Cholestyramine (6 g three times a day) for a period of 10 months and after three months of wash-out (cross-over) the sequence was reversed for an additional 10 months. Blood pressure, lipid parameters, glycated haemoglobin and urinary albumin excretion were measured during the study. Additionally, in eight patients, urinary glycosaminoglycan excretion (GAG) was also measured during the study. RESULTS: Simvastatin and Cholestyramine were equally effective in reducing total and LDL cholesterol. Only during Simvastatin treatment a significant reduction in diastolic blood pressure and both 24 h urinary albumin and GAG excretion rates were observed, while no significant changes were seen with Cholestyramine treatment. CONCLUSIONS: Our results clearly show for the first time that the reduction of blood pressure, together with 24 h urinary albumin excretion rate - two established cardiovascular risk factors, obtained during Simvastatin therapy in hypertensive type 2 diabetic patients - is in large part independent from the reduction of LDL Cholesterol.
Asunto(s)
Albuminuria , Anticolesterolemiantes/farmacología , Presión Sanguínea/efectos de los fármacos , Diabetes Mellitus Tipo 2/fisiopatología , Diabetes Mellitus Tipo 2/orina , Hipertensión/fisiopatología , Hipertensión/orina , Simvastatina/farmacología , Albuminuria/metabolismo , Albuminuria/orina , Anticolesterolemiantes/uso terapéutico , Apolipoproteínas/sangre , LDL-Colesterol/sangre , Resina de Colestiramina/farmacología , Resina de Colestiramina/uso terapéutico , Diabetes Mellitus Tipo 2/sangre , Diabetes Mellitus Tipo 2/complicaciones , Femenino , Glicosaminoglicanos/orina , Humanos , Hipertensión/sangre , Hipertensión/complicaciones , Masculino , Persona de Mediana Edad , Nitratos/sangre , Nitritos/sangre , Simvastatina/uso terapéuticoRESUMEN
The somatic size, shape, dendritic and axonal morphology, and synaptology of representative neurons in layer II of the primate entorhinal cortex (EC) were analyzed. Layer II "islands" contained large spinous multipolar cells with triangular somata and local circuit axons in addition to multipolar neurons with large, radially arrayed, aspinous, primary processes and thick tapering axons. Small pyramidal neurons with a single, spinous, apical primary segment that bifurcated a short distance from the somata were also found in layer II. Subsequent spinous segments of these neurons with long terminal segments exhibited a paucity of branching in addition to having thick axons tapering into subjacent layers. The importance of providing these additional axonal, dendritic, and synaptic characterizations lies in the contextual role these neurons play in the connectional patterns of the EC with regard to olfaction, olfactory memory, and pathological variations.
Asunto(s)
Corteza Entorrinal/ultraestructura , Neuronas/ultraestructura , Vías Olfatorias/ultraestructura , Animales , Dendritas/ultraestructura , Macaca mulatta/fisiología , Masculino , Microscopía Electrónica , Trastornos del Olfato/diagnósticoRESUMEN
The prospective evaluation and follow-up of 39 consecutive subjects with VT/VF, 6 of whom, with cardiac arrest (CA), are reported. Patients were enrolled in a specific staged-care approach protocol, which included coronary arteriography (CAR) and ventriculography (VC), in order to exclude the need of cardiac surgery, including coronary artery bypass graft (CABG), with and without left ventricular aneurysmectomy (LVA). The protocol included inducibility of VT/VF, which was verified by programmed electrical stimulation (PES) in control conditions and after antiarrhythmic therapy (ADT), to assess persistent inducibility and mainly to verify the hemodynamic sequelae of VT. VT that showed poor hemodynamic tolerance was treated with ICD, while well-tolerated VT was treated by ADT or ablation when indicated. Furthermore, PES was obtained after surgical procedures. As a first step, the patients were assigned to receive amiodarone (AMIO) (200-400 mg/daily) in the presence of EF% < 30% or contraindication to sotalol, (Group A), or sotalol (SOT) (80-140 mg/daily) in the presence of EF > or = 31%. (Group C). Conversely, in case of recurrences, patients were assigned to receive AMIO (200-300 mg/daily) plus metoprolol (MET) (20-100 mg/daily), (Group B) or, in case of intolerance to beta-blockers, to AMIO plus mexiletine (MEX) (200 mg/daily) (Group D). The four groups were similar for the type of VA, with recurrent ventricular tachycardia (RVT) being the most frequent one. The most frequent underlying cardiac disease of VA in this study was post-AMI CAD, with a rate of over 60% in all four groups. Single- and two-vessel lesions were found at CAR in various patients in all four groups, in 5/13 (38%) in Group A, in 8/14 (57%) in Group B, in 5/7 (71%) in Group C, and in 3/5 (60%) in Group D. Cardiac surgery was performed in a similar and limited number of patients in all four groups, in 4/13 (30%) in Group A, in 4/14 (35%) in Group B, in 2/7 (28%) in Group C, and in 2/5 (40%) in Group D. In 8/39 (20.5%) of the patients who underwent CABG, there was no operative or late mortality; 4/39 (10.2%) received CABG and LVA, and two died. For the amiodarone plus metoprolol and sotalol patients only, PES showed a lower residual inducibility, in comparison to the amiodarone and amiodarone + mexiletine groups. In the entire group, 7 out of 26 (27%) were still inducibile at PES while in 19/26 (64%) of the patients, an apparently effective treatment could be found, documenting the relative usefulness of PES. Recurrence rate was the highest in the amiodarone + mexiletine group and in patients with previous CA. Our data show the potential utility and limitations of ADT, even using the most effective antiarrhythmic drugs and association of drugs, mainly because of the high recurrence rate of VT observed in the present study, even in non-inducible patients [14/39 (36%)]. In conclusion, in a prospective and staged-care approach protocol of management of VT/VF patients, only a few patients with VT/VF benefited from cardiac surgery. PES could still play a role in the evaluation of the most effective ADT. Amiodarone + metoprolol seems to be the most effective ADT in these patients. Nevertheless, a high recurrence rate was observed in this patient population, even with an aggressive protocol, in the short follow-up period of 12 +/- 8 months, confirming recent data on the superiority of ICD to ADT, in patients with frequent recurrences or hemodynamically poorly-tolerated VT. In these patients, ICD therapy should definitively be preferred to ADT.