Isolation of Thermophilic Bacteria from Extreme Environments in Northern Chile.

The northern region of Chile boasts unique geographical features that support the emergence of geothermal effluents, salt lagoons, and coastal creeks. These extreme climate conditions create polyextreme habitats for microorganisms, particularly adapted to survive these harsh environments. These extremophilic microorganisms hold immense potential as a source of hydrolytic enzymes, among other biotechnological applications. In this study, we isolated 15 strains of aerobic thermophilic bacteria (45-70 °C) from sediment samples collected at five different ecological sites, including hot springs, geothermal fields, and lagoons in the Atacama Desert and Andes high planes. Analyses of the 16S rRNA gene sequences of the isolates showed a close genetic similarity (98-100%) with microorganisms of the genera Parageobacillus, Geobacillus, Anoxybacillus, and Aeribacillus. Notably, these thermophiles exhibited significant hydrolytic enzyme activity, particularly amylases, lipases, and proteases. These findings underscore the potential of using these thermophilic bacterial strains as an invaluable source of thermozymes with wide-ranging applications in diverse industries, such as detergent formulations, pharmaceutical processing, and food technology. This research highlights the ecological significance of these extreme environments in the Atacama Desert and Andes high plains, which serve as vital ecological niches housing extremophilic bacteria as a genetic source of relevant thermozymes, promising great potential for innovation in the biotechnology industry.

Isolation and Characterization of Thermus thermophilus Strain ET-1: An Extremely Thermophilic Bacterium with Extracellular Thermostable Proteolytic Activity Isolated from El Tatio Geothermal Field, Antofagasta, Chile.

The present study describes the isolation of an extremely thermophilic bacterium from El Tatio, a geyser field in the high planes of Northern Chile. The thermophile bacterium named Thermus thermophilus strain ET-1 showed 99% identity with T. thermophilus SGO.5JP 17-16 (GenBank accession No. CP002777) by 16S rDNA gene analysis. Morphologically, the cells were non-sporeforming Gram-negative rods that formed colonies with yellow pigmentation. This strain is able to proliferate between 55 and 80 °C with a pH range of 6-10, presenting an optimum growth rate at 80 °C and pH 8. The bacterium produces an extracellular protease activity. Characterization of this activity in a concentrated enzyme preparation revealed that extracellular protease had an optimal enzymatic activity at 80 °C at pH 10, a high thermostability with a half-life at 80 °C of 10 h, indicating that this enzyme can be classified as an alkaline protease. The proteolytic enzyme exhibits great stability towards chelators, divalent ions, organic solvents, and detergents. The enzyme was inhibited by phenylmethylsulfonyl fluoride (PMSF), implying that it was a serine protease. The high thermal and pH stability and the resistance to chelators/detergents suggest that the protease activity from this T. thermophilus. strain could be of interest in biotechnological applications.

Isolated Medial Patellofemoral Ligament Reconstruction in Patellar Instability: Does the Distance Between Tibial Tuberosity-Trochlear Groove Make a Difference?

Introduction: Medial patellofemoral ligament reconstruction (MPFLR) is used in most patellar instability surgeries, there is controversy on adding a tibial tuberosity osteotomy (TTO). Objective: To describe the results of isolated MPFLR in patellar instability according to the Tibial Tuberosity-Trochlear Groove distance (TT-TG). Methods: Retrospective study of patients with patellar instability with a mature skeleton in one center between 2016 and 2021, using isolated MPFLR. Patients with incomplete clinical and/or radiological records and less than one year follow-up were excluded. Pre-surgical demographic and radiological data (TT-TG, Caton-Deschamps (CD) index, patellar tilt, trochlear dysplasia) were recorded. Patients were divided into three groups according to TT-TG distance (Group 1: < 17 mm, Group 2: 17-19, Group 3: ≥ 20 mm). A pre and post-surgical Kujala score was performed. Local complications, satisfaction, recurrence and/or reintervention were recorded. Pre-surgical variables between groups, intra and inter-group Kujala differences were compared using Bartlett's test. Consent from the patients and approval from the local ethics committee were obtained. Results: 67 patients met the selection criteria, mean age of 23 years, 70% were women. There were no pre surgical, radiological nor follow-up differences between the groups (average 27 months). Pre and post-surgical Kujala score, respectively: Group 1: 37-78, Group 2: 37-78, Group 3: 39-79. All groups had a significant improvement (p < 0.05), there were no significant differences in improvement between groups (p > 0.05). There were three patients with a redislocation episode, all in group 1. One patient had a mobilization under anesthesia due to an arthrofibrosis (Group 2). 97% of all cases reported being satisfied. Conclusion: Isolated MPFLR in patellar instability presents a functional improvement, with a low rate of complications and failure, regardless of the pre surgical TT-TG. Supplementary Information: The online version contains supplementary material available at 10.1007/s43465-023-00906-6.

Fundus autofluorescence in the evaluation of diabetic macular edema treatment response.

INTRODUCTION: Fundus autofluorescence (FAF) has shown sensitivity in the detection of macular edema. OBJECTIVES: To evaluate indices formed with FAF and retinal anatomical-functional variables in patients with diabetic macular edema (DME) treated with ziv-aflibercept (ziv-AFL). METHODS: Twenty-nine eyes of 15 DME patients who received ziv-AFL intravitreal injections were included in the study. Best-corrected visual acuity (BCVA), contrast sensitivity (CS), optical coherence tomography (OCT) and FAF were evaluated before treatment and at one and two months. OCT variables were central subfield thickness (CST), macular volume (MV) and macular cube average thickness (MCAT). FAF/BCVA, FAF/CS, FAF/CST, FAF/MV and AF/MCAT indices baseline values were obtained. Analysis was performed with Spearman's rank correlation coefficient and linear regression analysis. RESULTS: There was a significant correlation between baseline FAF/BCVA index and BCVA at second month (rs = - 0.78, p = 0.000), between baseline FAF/CS index and BCVA at second month (rs = -0.68, p = 0.0009) and between baseline FAF/CS index and MV at first month of follow-up (rs = 0.64, p = 0.002). CONCLUSIONS: In DME, composite indices with baseline FAF predict variables such as BCVA in the follow-up of patients receiving ziv-AFL.

INTRODUCCIÓN: La autofluorescencia retiniana (AF) ha mostrado sensibilidad en la detección del edema macular. OBJETIVOS: Evaluar índices formados con la AF y variables anatomofuncionales retinianas en pacientes con edema macular diabético (EMD) tratados con ziv-aflibercept (ziv-AFL). MÉTODOS: Fueron incluidos 29 ojos de 15 pacientes con EMD que recibieron inyecciones intravítreas de ziv-AFL. Se evaluó agudeza visual mejor corregida (AVMC), sensibilidad al contraste (SC), tomografía de coherencia óptica (TCO) y AF, antes del tratamiento, así como al primer y segundo mes de iniciado este. Las variables de la TCO fueron grosor foveal central (GFC), volumen macular (VM) y grosor promedio macular (GPM). Se obtuvieron los valores basales de AF/AVMC, AF/SC, AF/GFC, AF/VM y AF/GPM. Se realizó análisis con el coeficiente de correlación de rangos de Spearman y análisis de regresión lineal. RESULTADOS: Hubo una correlación significativa entre el índice AF/AVMC basal y la AVMC en el segundo mes (rs = −0.78, p = 0.000), entre el índice AF/SC basal y la AVMC en el segundo mes (rs = −0.68, p = 0.0009) y entre AF/SC basal y el VM en el primer mes de seguimiento (rs = 0.64, p = 0.002). CONCLUSIONES: En el EMD, los índices compuestos con AF basales predicen variables como AVMC en el seguimiento de pacientes que reciben ziv-AFL.

Autofluorescence indexes as biomarkers for antiangiogenic loading dose outcome in diabetic macular edema.

PURPOSE: To evaluate the combination of fundus autofluorescence results with several clinical and structural variables into mathematical indexes to enhance their ability to predict visual and anatomical changes after the antivascular endothelial growth factor loading dose. METHODS: Patients with diabetic macular edema were enrolled. Each patient had a comprehensive ophthalmological examination, contrast sensitivity, optical coherence tomography, and fundus autofluorescence assessment. All patients received three monthly doses of ziv-aflibercept and were followed each month for response assessment. Autofluorescence was classified according to its level into five grades. The grades were combined with other variables (best-corrected visual acuity, contrast sensitivity, central macular thickness, macular cube volume, and macular cube average thickness) into normalized indexes. Statistical assessment was done using a Spearman's rank correlation coefficient, linear regression, and interobserver-agreement analysis. RESULTS: There was a strong correlation between the fundus autofluorescence/baseline best-corrected visual acuity index and the fundus autofluorescence/contrast-sensitivity index at baseline with the best-corrected visual acuity after the third dose of ziv-aflibercept (rs = -0.78, p = .000 and rs = -0.68, p = .0009 respectively). The fundus autofluorescence/baseline best-corrected visual acuity index and the fundus autofluorescence/contrast-sensitivity index, both at baseline had a mild correlation with the macular volume at 1 month of follow-up (rs = 0.56, p = .008 and (rs = 0.64, p = .002, respectively). CONCLUSION: This study suggests that it is possible to combine fundus autofluorescence results with functional and structural variables into normalized indexes that could potentially predict outcomes after antivascular endothelial growth factor loading dose in patients with diabetic macular edema.

Abnormal development of the inferior vena cava and its implications on distal venous drainage during cardiac surgery and other clinical entities.

Congenital anomalies of the inferior vena cava (IVC) are caused by an abnormal persistence or regression of embryonic precursor veins; they are usually incidental findings on imaging studies. These rare conditions have a 0.6% prevalence in individuals with congenital heart diseases and 0.3% in healthy patients. The purpose of this paper was to report two cases of interruption of IVC with hemiazygos continuation and its implications during surgery, highlighting that after recognizing this anomalous drainage the surgeon should be prepared to change the surgical strategies, especially in cardiovascular surgery, in order to obtain adequate circulatory flows or surgical exposure where venous cannulation could be difficult. We have also reported two cases of healthy patients with the same isolated IVC anomaly with no clinical repercussions, which can develop in the future.

Correlation analysis of fundus autofluorescence, spectral domain optical coherence tomography, and visual function in patients with diabetic macular oedema treated with intravitreal ziv-aflibercept.

PURPOSE: The aim of this study was to evaluate the correlations between fundus autofluorescence and morphologic parameters as well as visual function in patients with diabetic macular oedema treated with intravitreal ziv-aflibercept. METHODS: A total of 34 eyes of 20 patients with untreated diabetic macular oedema received an intravitreal injection of ziv-aflibercept at baseline, and 1 and 2 months later. The baseline, 1-month, and two-month best corrected visual acuity determination, contrast sensitivity, spectral domain optical coherence tomography, mean central macular thickness, mean macular cube volume, mean macular cube average thickness, and fundus autofluorescence (decreased, normal, or increased; and single or multiple spots) were measured. Correlation analysis with a determination of Spearman's rank correlation coefficient, regression analysis, agreement between investigators, and Friedman's test were used for statistical analyses. RESULTS: A direct correlation was observed between baseline fundus autofluorescence and macular cube average thickness at 1 month (r = 0.51, p = 0.020) and between fundus autofluorescence at 1 month and baseline macular cube average thickness (r = 0.50, p = 0.021). Regression analysis showed a coefficient of determination of 0.29 (p = 0.016) between baseline fundus autofluorescence and macular cube average thickness at 1 month. CONCLUSION: In patients with diabetic macular oedema, the pretreatment baseline degree of foveal fundus autofluorescence might be helpful in predicting macular cube average thickness in patients undergoing treatment with intravitreal ziv-aflibercept in the short term.

A shifting balance: responses of mixotrophic marine algae to cooling and warming under UVR.

Mixotrophy is a dominant metabolic strategy in ecosystems worldwide. Shifts in temperature (T) and light (i.e. the ultraviolet portion of spectrum (UVR)) are key abiotic factors that modulate the conditions under which an organism is able to live. However, whether the interaction between both drivers alters mixotrophy in a global-change context remains unassessed. To determine the T × UVR effects on relative electron transport rates, nonphotochemical quenching, bacterivory, and bacterial production, we conducted an experiment with Isochrysis galbana populations grown mixotrophically, which were exposed to 5°C of cooling and warming with respect to the control (19°C) with (or without) UVR over light-dark cycles and different timescales. At the beginning of the experiment, cooling inhibited the relative electron transport and bacterivory rates, whereas warming depressed only bacterivory regardless of the radiation treatment. By the end of the experiment, warming and UVR conditions stimulated bacterivory. These reduced relative electron transport rates (c. 50% (warming) and > 70% (cooling)) were offset by increased (35%) cumulative bacterivory rates under warming and UVR conditions. We propose that mixotrophy constitutes an energy-saving and a compensatory mechanism to gain carbon (C) when photosynthesis is impaired, and highlight the need to consider the natural environmental changes affecting the populations when we test the impacts of interacting global-change drivers.

Metabolismo de la próstata y la progresión al Cáncer de Próstata / Metabolism of the prostate and progression to Prostate Cancer

El cáncer de próstata se caracteriza por una baja tasa de absorción de glucólisis y glucosa. En las células prostáticas, los ácidos grasos predominan sobre la glucosa en la obtención de energía. Los mecanismos genéticos y moleculares responsables y asociados específicamente con el desarrollo y la progresión de las células de próstata malignas son en gran parte no identificados. Junto con esto, se ignora el papel del metabolismo celular alterado como un factor esencial en la malignidad de la próstata; aunque las transformaciones del metabolismo están implicadas en prácticamente todas las células malignas. Las combinaciones genéticas / moleculares / metabólicas son necesarias para identificar eventos críticos en el proceso de malignidad de la próstata. Dichos estudios están comenzando a revelar una comprensión esencial del desarrollo y la progresión del cáncer de próstata. Conclusión: las células de la próstata se caracterizan por una absorción dominante de ácido graso sobre la glucosa, lo que sugiere que el desarrollo futuro de nuevos enfoques diagnósticos y terapéuticos en el cáncer de próstata debería centrarse en el sustrato de ácido graso.

Prostate cancer is characterized by a low absorption rate of glycolysis and glucose. In prostate cells, fatty acids predominate over glucose in obtaining energy. The genetic and molecular mechanisms responsible and specifically associated with the development and progression of malignant prostate cells are largely unidentified. Along with this, the role of altered cellular metabolism as an essential factor in the malignancy of the prostate is ignored; although the transformations of metabolism are involved in practically all malignant cells. Genetic / molecular / metabolic combinations are necessary to identify critical events in the process of malignancy of the prostate. These studies are beginning to reveal an essential understanding of the development and progression of prostate cancer. Conclusion: prostate cells are characterized by a dominant absorption of fatty acid on glucose, which suggests that the future development of new diagnostic and therapeutic approaches in prostate cancer should focus on the fatty acid substrate.

Aplicación de la Tomografía por emisión de positrones en el cáncer de próstata marcado con 68Ga-PSMA: Revisión y actualidad / Application of positron emission tomography in prostate cancer marked with 68Ga-PSMA: Review and update

Una de las características de cáncer de próstata es su baja afinidad a la absorción de glucólisis y glucosa. Esto se traduce la baja afinidad del 18F-FDG para la detección de los tumores de próstata por el PET/ CT. El antígeno prostático específico de membrana (PSMA) es una proteína transmembrana presente en todos los tejidos prostáticos. El incremento de la expresión de PSMA está presente en varios tumores, aunque su concentración es más elevada en el cáncer de próstata. Casi todos los adenocarcinomas de próstata muestran expresión de PSMA en la mayoría de las lesiones, tanto primarias como metastásicas. La expresión del PSMA en cáncer de próstata es más elevada que en otros tipos de cáncer, donde se ha descrito la presencia de PSMA. Se ha demostrado que el incremento de este antígeno se presenta principalmente en casi todos los adenocarcinomas de próstata tanto primario como metastásico con diferentes grados de desdiferenciados. La tomografía por emisión de positrones/tomografía computarizada (PET/TC) es una técnica de imagen no invasiva, reconocida para el estudio de diversos tumores malignos. La PET/CT marcada con 68Ga-PSMA o 18F-PSMA proporciona imágenes metabólicas semicuantitativas de las concentraciones anormales de este antígeno permitiendo una valoración más precisa del cáncer de próstata. En esta revisión describiremos la importancia de 68Ga-PSMA PET/CT en la valoración del cáncer de próstata.

One of the characteristics of prostate cancer is its low affinity to the absorption of glycolysis and glucose. This translates the low affinity of 18F-FDG for the detection of prostate tumors by PET/CT. Prostate-specific membrane antigen (PSMA) is a transmembrane protein present in all prostate tissues. The increase in the expression of PSMA is present in several tumors, although its concentration is higher in prostate cancer. Almost all prostate adenocarcinomas show PSMA expression in most lesions, both primary and metastatic. The expression of PSMA in prostate cancer is higher than in other types of cancer, where the presence of PSMA has been described. It has been shown that the increase of this antigen occurs mainly in almost all prostate adenocarcinomas, both primary and metastatic with different degrees of dedifferentiated. Positron emission tomography / computed tomography (PET/CT) is a noninvasive imaging technique, recognized for the study of various malignancies. PET/CT labeled with 68Ga-PSMA or 18F-PSMA provides semi quantitative metabolic images of abnormal concentrations of this antigen allowing a more accurate assessment of prostate cancer. In this review we will describe the importance of 68Ga-PSMA PET/CT in the evaluation of prostate cancer.

Urología: Cáncer de Próstata Gleason 8 18F-FDG PET/CT / Urology: Prostate Cancer Gleason 8 18F-FDG PET/CT

El uso de la tomografía por emisión de positrones con fluordesoxiglucosa 18F-FDG-PET/CT en cáncer de próstata ha sido controversial, después de algunos trabajos científicos se ha visto que el uso de fluordesoxiglucosa (18F-FDG) es de gran utilidad tanto en el estadiaje pre tratamiento y en el seguimiento cuando el Gleason es mayor a 7, esto debido a que esa puntuación está en relación con el grado de des diferenciación y de agresividad, siendo de gran valor en estos pacientes pues la 18F-FDG-PET/CT es más accesible en la mayoría de países, además el 18F-FDG-PET/CT detecta de manera más confiable metástasis óseas y a distancia. Se presenta un caso de cáncer de próstata con Gleason 8 y 10 en donde se analiza la aplicación y aporte de las imágenes 18F-FDG-PET/CT permitiendo una estadificación más precisa, facilitando una adecuada elección terapéutica.

The use 18F-FDG-PET/CT in prostate cancer has been controversial, after some scientific work it has been seen that the use of (18F-FDG) is very useful both in the pre-treatment staging and in the follow-up when the Gleason is higher to 7, this is due to the fact that this score is related to the degree of differentiation and degree of aggressiveness, being of great value in these patients since PET/CT with 18FDG is more accessible in most countries, in addition 18F-FDG-PET/CT detects bone and distance metastases more reliably. A case of prostate cancer with Gleason 8 and 10 is presented, where the application and contribution of the 18F-FDG-PET/CT allowing a more precise staging, facilitating an adequate therapeutic choice.

Inverted ILM flap, free ILM flap and conventional ILM peeling for large macular holes.

BACKGROUND: To assess closure rate after a single surgery of large macular holes and their visual recovery in the short term with three different surgical techniques. METHODS: Prospective multicenter randomized controlled trial. We included treatment-naïve patients with diagnosis of large macular hole (minimum diameter of > 400 µm). All patients underwent a comprehensive ophthalmological examination. Before surgery, the patients were randomized into three groups: group A: conventional internal limiting membrane peeling, group B: inverted-flap technique and group C: free-flap technique. All study measurements were repeated within the period of 1 and 3 months after surgery. Continuous variables were assessed with a Kruskal-Wallis test, change in visual acuity was assessed with analysis of variance for repeated measurements with a Bonferroni correction for statistical significance. RESULTS: Thirty-eight patients were enrolled (group A: 12, group B: 12, group C: 14). The closure rate was in group A and B: 91.6%; 95% CI 61.52-99.79%. In group C: 85.71%; 95% CI 57.19-98.22%. There were no differences in the macular hole closure rate between groups (p = 0.85). All groups improved ≈ 0.2 logMAR, but only group B reached statistical significance (p < 0.007). CONCLUSIONS: Despite all techniques displayed a trend toward visual improvement, the inverted-flap technique seems to induce a faster and more significant recovery in the short term.

Transitory microbial habitat in the hyperarid Atacama Desert.

Traces of life are nearly ubiquitous on Earth. However, a central unresolved question is whether these traces always indicate an active microbial community or whether, in extreme environments, such as hyperarid deserts, they instead reflect just dormant or dead cells. Although microbial biomass and diversity decrease with increasing aridity in the Atacama Desert, we provide multiple lines of evidence for the presence of an at times metabolically active, microbial community in one of the driest places on Earth. We base this observation on four major lines of evidence: (i) a physico-chemical characterization of the soil habitability after an exceptional rain event, (ii) identified biomolecules indicative of potentially active cells [e.g., presence of ATP, phospholipid fatty acids (PLFAs), metabolites, and enzymatic activity], (iii) measurements of in situ replication rates of genomes of uncultivated bacteria reconstructed from selected samples, and (iv) microbial community patterns specific to soil parameters and depths. We infer that the microbial populations have undergone selection and adaptation in response to their specific soil microenvironment and in particular to the degree of aridity. Collectively, our results highlight that even the hyperarid Atacama Desert can provide a habitable environment for microorganisms that allows them to become metabolically active following an episodic increase in moisture and that once it decreases, so does the activity of the microbiota. These results have implications for the prospect of life on other planets such as Mars, which has transitioned from an earlier wetter environment to today's extreme hyperaridity.

[Modified technique of autologous transplantation of internal limiting membrane for macular hole]. / Técnica modificada de trasplante autólogo de membrana limitante interna en agujero macular.

BACKGROUND: Autologous internal limiting membrane transplantation has allowed some cases of macular holes refractory to conventional surgery techniques to be treated. The purpose of this study is to describe the anatomical and functional outcomes of a modification of this technique in a case series of naïve macular hole patients. MATERIAL AND METHODS: A consecutive case series study was performed on patients with naïve macular holes with a diameter greater than 600 µ. Best corrected visual acuity, clinical features of the macular area, and optical coherence tomography were recorded before the operation and at the end of follow-up in all patients studied. All patients underwent 23 Ga core vitrectomy, posterior hyaloid separation, and brilliant-blue assisted internal limiting membrane peeling. A small piece of the internal limiting membrane was peeled off to make a free flap, and this was trasplanted and placed inside the macular hole under perfluorocarbon liquids. Air-fluid exchange was performed and SF6 gas was injected at a non-expansile concentration. RESULTS: The study included 5 eyes of 5 patients who underwent internal limiting membrane autograft. The mean age was 50.6 (SD 12.3) years. Four of the 5 cases had macular hole closure. The case where there was no closure of the macular hole was secondary to trauma. There was an improvement in visual acuity in all patients where the closing of the macular hole was achieved at the end of follow-up. CONCLUSIONS: In this cases series of macular hole patients, the autologous internal limiting membrane transplantation was associated with an anatomical closure of the macular hole and functional improvement in most of the patients studied.

Genetic structure in village dogs reveals a Central Asian domestication origin.

Dogs were the first domesticated species, originating at least 15,000 y ago from Eurasian gray wolves. Dogs today consist primarily of two specialized groups--a diverse set of nearly 400 pure breeds and a far more populous group of free-ranging animals adapted to a human commensal lifestyle (village dogs). Village dogs are more genetically diverse and geographically widespread than purebred dogs making them vital for unraveling dog population history. Using a semicustom 185,805-marker genotyping array, we conducted a large-scale survey of autosomal, mitochondrial, and Y chromosome diversity in 4,676 purebred dogs from 161 breeds and 549 village dogs from 38 countries. Geographic structure shows both isolation and gene flow have shaped genetic diversity in village dog populations. Some populations (notably those in the Neotropics and the South Pacific) are almost completely derived from European stock, whereas others are clearly admixed between indigenous and European dogs. Importantly, many populations--including those of Vietnam, India, and Egypt-show minimal evidence of European admixture. These populations exhibit a clear gradient of short--range linkage disequilibrium consistent with a Central Asian domestication origin.

Ultrasound-detected musculoskeletal urate crystal deposition: which joints and what findings should be assessed for diagnosing gout?

OBJECTIVE: The primary objective of this prospective case-control study was to assess the diagnostic value of several intra-articular and periarticular ultrasound (US)-detected abnormalities in the upper and lower limbs in gout. The secondary objective was to test the concurrent validity of US abnormalities using as gold standard the microscopic demonstration of monosodium urate (MSU) crystals. METHODS: Ninety-one men with gout and 42 age-matched controls were prospectively recruited. All patients with gout and controls underwent US assessment of several US abnormalities in 26 joints, six bursae, eight tendons, 20 tendon compartments, four ligaments, and 18 articular cartilages by experts in US blinded to the patients' group. Patients with gout and controls with US abnormalities were asked to undergo US-guided aspiration for microscopic identification of MSU crystals. Interobserver and intraobserver reliability of the US assessment was evaluated in a web-based exercise. RESULTS: The assessment of one joint (ie, radiocarpal joint) for hyperechoic aggregates (HAGs), two tendons (ie, patellar tendon and triceps tendon) for HAGs and three articular cartilages (ie, first metatarsal, talar and second metacarpal/femoral) for double contour sign showed the best balance between sensitivity and specificity (84.6% and 83.3%, respectively). Intraobserver reliability was good (mean κ 0.75) and interobserver reliability was moderate (κ 0.52). The aspirated material from HAGs was positive for MSU crystals in 77.6% of patients with gout and negative in all controls. CONCLUSIONS: Our results suggest that US bilateral assessment of one joint, three articular cartilages and two tendons may be valid for diagnosing gout with acceptable sensitivity and specificity.

Manejo conservador de la ruptura del tendón de Aquiles y coadyuvancia biológica con factores de crecimiento autólogos / Conservative management of ruptured Achilles tendon and biological coadyuvancia with autologous growth factors

La ruptura del tendón de Aquiles es una lesión grave e invalidante, de ahí la importancia de un correcto y rápido tratamiento. Existe controversia en cuanto al tratamiento ideal, ya sea quirúrgico o no quirúrgico. Lo importante es conseguir un resultado funcional satisfactorio. Describimos el caso de un paciente joven con ruptura completa del tendón de Aquiles tratado no quirúrgicamente con inmovilización y aplicación percutánea de factores de crecimiento autólogos como coadyuvancia biológica.

Endoscopic lymphadenectomy for penile carcinoma.

BACKGROUND AND PURPOSE: Groin dissection remains the gold standard for the treatment of penile carcinoma that has metastasized to the inguinal lymph nodes. However, it is associated with wound-related complications. Modified groin dissection offers a less-radical approach without compromising oncologic outcomes. We present our technique for endoscopic lymphadenectomy for penile carcinoma (ELPC). PATIENTS AND METHODS: Eight patients with clinical stage T(2) N(0-3)M(0) penile carcinoma underwent ELPC. Preoperative Doppler ultrasound mapping of the inguinal lymph nodes and the saphenous vein was performed. RESULTS: Fourteen lymphadenectomies, including superficial with or without deep inguinal and pelvic-node dissection, were completed in eight patients. The median operative time was 91 minutes (range 50-150 minutes), and the mean number of nodes removed was 9 (range 4-15). No perioperative complications occurred. Lymphoceles developed in three groins (23%). No wound-related complications were seen. CONCLUSIONS: The ELPC is a safe and feasible technique that appears to diminish the wound-related complications associated with the standard open approach.

Trasplante renal en el Hospital Metropolitano de Quito: experiencia de 80 casos con 13 años de seguimiento / Renal transplant in the Metropolitan Hospital of Quito: experience of 80 cases with 13 years of pursuit

Estudiamos la evolución histórica de los trasplantes de riñón en el Hospital Metropolitano, en donde se realizan 82 trasplantes todos con donantes vivos relacionados o no relacionados. Se excluyen del análisis 2 pacientes por no haber tenido el mismo control y seguimiento que los restantes. Se presenta los estudios que se realizan previo al trasplante renal así como el procedimiento quirúrgico y la ruta crítica post-operatorio. Se analizan las enfermedades que condujeron a insuficiencia renal siendo la primera causa desconocida y la segunda la glomerulonefritis crónica. Se enfatiza que existieron pacientes diabéticos y con otras enfermedades sistémicas.