Factors influencing NiTi endodontic file separation: A thematic review.

Nickel-titanium (NiTi) file separation during endodontic treatment is an undesirable event. This phenomenon needs to be understood by knowing the factors influencing fracture in endodontic files. There is a large amount of literature where these factors and their influence have been studied, increasing the knowledge about the mechanisms involved, mainly related to wire technology, file shapes and geometry, operator manipulation, the anatomy of the root canal, and the irrigation and sterilization processes. As many factors are involved, the complexity of the fracture phenomena increases and the isolated correlation of one factor with the file fracture becomes a small part of comprehending the separation phenomena. This thematic review aims to compile important reports from 2014 to 2022 on the factors influencing NiTi file separation. The information obtained was classified into wire technology, file geometry, operational aspects, irrigation and sterilization, and anatomy. For this purpose, the Scopus, Web of Science and ScienceDirect databases were consulted using a search string. Filters were applied to consolidate the final set of relevant papers covering the subject of factors influencing endodontic file separation. It was found that the fracture of NiTi files incorporates different mechanisms that operate simultaneously during the endodontic procedure and strongly affect the instrument performance. The collected information promotes good practices to prevent file separation.

Human Serum Albumin in the Presence of Small Platinum Nanoparticles.

Noble metal materials, especially platinum nanoparticles (Pt NPs), have immense potential in nanomedicine as therapeutic agents on account of their high electron density and their high surface area. Intravenous injection is proposed as the best mode to deliver the product to patients. However, our understanding of the reaction of nanoparticles with blood components, especially proteins, is far behind the explosive development of these agents. Using synchrotron radiation circular dichroism (SRCD), we investigated the structural and stability changes of human serum albumin (HSA) upon interaction with PEG-OH coated Pt NPs at nanomolar concentrations, conditions potentially encountered for intravenous injection. There is no strong complexation found between HSA and Pt NPs. However, for the highest molar ratio of NP:HSA of 1:1, an increase of 18 °C in the thermal unfolding of HSA was observed, which is attributed to increased thermal stability of HSA generated by preferential hydration. This work proposes a new and fast method to probe the potential toxicity of nanoparticles intended for clinical use with intravenous injection.

Registro multicéntrico Impella CP para shock cardiogénico o angioplastía de alto riesgo protegida en Chile

Antecedentes: El Shock Cardiogénico (SC) y las Angioplastías de Alto Riesgo (AAR) están asociadas con altas tasas de mortalidad. El uso del dispositivo Impella CP podría reducir el riesgo de muerte en estos escenarios. En Chile no existen reportes evaluando el uso del dispositivo Impella CP. Objetivo: Analizar los desenlaces clínicos en pacientes que fueron sometidos al uso del dispositivo Impella CP por SC o por AAR. Métodos: Se realizó un estudio retrospectivo en 17 pacientes, los cuales representan el total de implantes realizados en el país, entre octubre 2021 y agosto 2023. Se describió las características, demográficas, procedimentales y después del implante. Se estimó la mortalidad general y se identificaron factores asociados. Resultados: La edad de los pacientes fue 69± 3,7 años y 88,2% fueron hombres. El 64,7% recibió el dispositivo por SC y 35,3% por AAR. Dentro de las comorbilidades estudiadas, la hipertensión arterial fue la más frecuente, 94,1%. Un 58,8% de los pacientes fueron revascularizados a través de la arteria radial. El 29,4% recibió el dispositivo previo a la angioplastía y 70,6% lo recibió después. El 47,1% de las angioplastías fue guiada por imágenes. En 11,8% de ellos se realizó litotricia intracoronaria y 5,9% por ablación intracoronaria. Los pacientes estuvieron 13 ±3,4 días con el soporte. La mortalidad global fue de 41,2%. Conclusiones: El uso del dispositivo Impella presentó pocas complicaciones vasculares. La mortalidad asociada con su colocación en Chile fue relativamente similar con la reportada en la literatura.

Background: Cardiogenic shock and high-risk Angioplasty are associated with a high mortality rate. Using the Impella CP device could reduce the risk of death in these scenarios. In Chile, there are no studies evaluating the use of the Impella CP device. Objective: To analyse the clinical outcomes in patients who have undergone placement of the Impella CP device for cardiogenic shock and high-risk angioplasties. Methods: A retrospective study was carried out on 17 patients, which represent the total number of implants performed in the country, between October 2021 and August 2023. The demographic, procedural and post-implant characteristics were described. Overall mortality and associated factors were identified. Results: The age was 69± 3.7 years, where 88.2% were men. 64.7% of patients received the device by SC and 35.3% by AAR. Among the comorbidities studied, arterial hypertension was the most frequent with 94.1%. 58.8% of patients were revascularized through the radial artery. 29.4% of patients received the device before angioplasty and 70.6% received it afterwards. 47.1% of angioplasties were image-guided, 11.8% had intracoronary lithotripsy, and 5.9% had intracoronary ablation. The patients spent 13 ±3.4 days with the support. Overall mortality was 41.2%. Conclusion: use of the Impella device was associated with few vascular complications. Mortality associated with use of the Impella device in Chile was similar to that previously reported in other studies.

Effect of the addition of silica obtained from rice husk on physicochemical and mechanical properties of fibercement.

After replacing asbestos with other types of fibers used as reinforcement of cementitious matrices, it has been found that rice husk, an agro-industrial waste with high silica content, can be used to improve the properties of fibercement. In this work, the effect of adding different forms of silica (rice husk, rice husk ash, and silica microparticles) on fibercement's physicochemical and mechanical properties was investigated. Rice husk ash and silica microparticles were extracted from the rice husk incineration and acid leaching process. The chemical composition of silica was determined by X-Ray Fluorescence, and the ash leached with hydrochloric acid was found to contain more than 98% silica. Cement, fiberglass, additives, and different forms of silica were used to manufacture fibercement specimens in their different forms. Concentrations of 0%, 3%, 5%, and 7% were taken for each form of silica, and four replicates were performed. The setting time was 28 days, during which absorption, density, and humidity tests were performed. Experiments were statistically analyzed at a 95% confidence value, and it was determined that there are significant differences in the compressive resistance, density, and absorption in relation to the type of additive and the interaction between the type of additive and its percentage of addition, but not whit percentage of addition. It was found that the fibercement specimens with 3% of rice husk present a modulus of elasticity of 9.4% higher than de control sample. The use of rice husk as an additive in fibercement composites seems to be interesting because these agro-industrial wastes are inexpensive and easily available everywhere to utilize in the cement industry and also helpful in reducing environmental pollution due to their cost and the positive effect on their properties.

Women with Anemia Refractory to Oral Iron Treatment Following Bariatric Surgery: a Short-Term Analysis.

INTRODUCTION: Iron deficiency and anemia are common after bariatric surgery. Women have a higher risk of developing such long-term complications. Though oral supplementation is indicated, intravenous iron therapy is required in some cases. METHODS: This retrospective study included patients who underwent bariatric surgery between 2012 and 2018. Postoperative anemia patients receiving parental iron therapy were assessed during the first 24 months. Their baseline characteristics, surgery type, and laboratory test results were analyzed. A follow-up analysis included a subgroup of women with and without gynecological disorders. Patients with vitamin B12 or folic acid deficiencies were excluded. RESULTS: Six hundred eleven (63.3%) met the inclusion criteria: 525 underwent gastric bypass, of which 79.6% were women. Overall, postoperative anemia was 28.9% (24.5% related to gastric bypass), especially among women (84%). Anemia refractory to oral iron therapy was observed in 12.9% of patients. All the patients requiring iron infusions (n = 54) were women, and half of them (51.8%) reported abnormal uterine bleeding. Postsurgical hemogram values were significantly lower in patients with abnormal uterine bleeding (despite the same number of infusions) than in those without gynecological disorders; 89.2% of these women had preoperative anemia. CONCLUSION: Anemia is frequent in bariatric surgery patients despite supplementation. Women undergoing gastric bypass with a history of gynecological disorders are prone to require more iron infusions. Consulting with the patient about a higher risk is important, and probably knowing the plan or including the opinion of an OBGYN to determine as a team the assessment, treatment, and prognosis.

Fatigue failure of NiTi endodontic files: scoping review / Falla por fatiga de limas NiTi para endodoncia: revisión exploratoria de cobertura temática

Abstract Introduction: Nickel-Titanium (NiTi) endodontic files are made of hyperelastic material with shape memory. However, these files suffer a sudden fracture during the endodontic treatment, which is considered an unfavorable prognosis. Many studies have been conducted to establish fatigue resistance focused on file brands and determine which is better. Although the most common failure mechanisms have been established for motorized endodontic files, the information is scattered, making it difficult to develop clear research trends. Methods: a scoping review was carried out using Scopus, Dimensions.ai, Web of Science, and Science Direct databases to answer screening questions related to the predominant fracture mechanism in NiTi files, test types, and equipment used for experimentation and to identify the most active authors. Results: using the general search terms, 432 research papers were found, of which 75 were finally selected after eliminating duplicates and applying exclusion criteria. Conclusions: typical failure mechanisms for rotatory and reciprocating files were identified based on the panoramic review and bibliometric indicators. Also, the standard mechanical tests for endodontic files and the characteristics of their assemblies were summarized. The most active authors in the area and their nationality were tagged. Finally, gaps for future research are proposed to generate a comprehensive knowledge of NiTi file failure.

Resumen Introducción: las limas de Níquel-Titanio (NiTi) utilizadas en endodoncia están hechas de un material hiperelástico con memoria de forma. Sin embargo, estas limas sufren fractura repentina durante el tratamiento, lo cual se considera un pronóstico desfavorable. Se han realizado diversos estudios para establecer la resistencia a la fatiga de limas, y determinar cuál marca es mejor. Aunque se han establecido los mecanismos de falla más comunes para las limas de endodoncia motorizadas, la información se encuentra dispersa, dificultando la definición de tendencias claras de investigación. Métodos: se realizó una revisión de cobertura temática utilizando las bases de datos Scopus, Dimensions.ai, Web of Science y Science Direct, para responder a preguntas orientadoras relacionadas con el mecanismo de fractura predominante en las limas NiTi, tipos de pruebas y equipos utilizados para la experimentación e identificar los autores más activos en el área. Resultados: utilizando términos generales de búsqueda, se encontraron 435 trabajos de investigación. Finalmente se seleccionaron 75, tras eliminar duplicados y aplicar criterios de exclusión. Conclusiones: a partir de la revisión panorámica de literatura y empleando algunos indicadores bibliométricos, se identificaron los mecanismos de falla más comunes para las limas rotatorias y reciprocantes. Se obtuvo información sobre ensayos mecánicos y los montajes más utilizados para las limas de endodoncia. Se identificaron los autores más activos en el área y su nacionalidad. Por último, se sugieren oportunidades de investigación para generar un conocimiento exhaustivo sobre la falla de las limas NiTi.

Repercusión de la pandemia COVID-19 en la práctica de la cardiología intervencional en Chile: datos aportados por la encuesta del grupo Stent-Save a Life! LATAM working group / Decrease in the activity of interventional cardiology in Chile: a report from the "Stent-Save a Life! LATAM working group"

RESUMEN: Introducción: El Stent-Save a Life! (SSL) LATAM working group diseñó una encuesta para objetivar la reducción de la actividad de los laboratorios de hemodinamia en Latinoamérica durante la pandemia COVID-19. Ante la amenaza de nuevos confinamientos en Chile, nos propusimos objetivar las consecuencias de la primera ola de contagios en nuestra actividad. Objetivos: Discutir la repercusión de la pandemia en la cardiología intervencional en Chile. Métodos: El grupo SSL realizó una encuesta telemática a todos los países de Latinoamérica incluido Chile. Se registraron las coronariografías (CAG), intervenciones coronarias percutáneas (ACTP) e intervenciones estructurales, comparando dos períodos determinados por el confinamiento por la pandemia, cada uno de dos semanas. Pre-COVID-19: período previo al confinamiento, y COVID-19: período durante el confinamiento. Se analizan, a partir de esta encuesta, los resultados aplicados a nuestro país. Resultados: Se obtuvo respuesta de trece centros. Hubo una reducción en el número global de procedimientos entre período Pre-COVID-19 y COVID-19 de un 65,1%. Se reportó una disminución de 67% en las CAG, de un 59,4% en las ACTP y de un 92% en los procedimientos terapéuticos estructurales. Entre ambos períodos se redujo la consulta por Síndrome Coronario Agudo por elevación del segmento ST (SCACEST) en 40,8%. Conclusiones: En nuestro país se objetivó una reducción marcada de la actividad asistencial de la cardiología intervencional durante la pandemia COVID-19 y una disminución significativa en el número de pacientes tratados por SCACEST. Los resultados de nuestro país son similares a los reportados por países de Latinoamérica, Europa y Norteamérica.

ABSTRACT: Background: The Stent-Save a Life! (SSL) LATAM working group designed a survey to demonstrate the reduction in the activity of cardiac catheterization laboratories in Latin America during the COVID-19 pandemic. Considering the risk of a new confinement in Chile, we decided to assess the impact of the first wave of contagions on our activity. Aims: To discuss the repercussion of the COVID-19 pandemic on the activity of interventional cardiology in Chile. Methods: The SSL group conducted a telematic survey in all Latin American countries. Coronary angiography, coronary interventions (PCI) and structural interventions were registered, comparing two periods of two weeks duration each: before and during COVID-19 confinement. Results obtained in Chile are analyzed. Results: Thirteen centers in Chile answered the survey. There was an overall decrease of 65.1% in the number of procedures between the pre and the post COVID-19 periods. Coronary angiographies decreased 67%, PCI 59.4% and therapeutical structural procedures 92%. The reduction in acute coronary syndrome with ST segment elevation (STEMI) was 40,8% between periods. Conclusions: In Chile, a significant reduction in healthcare activity related to interventional cardiology and a significant decrease in the number of patients treated with STEMI was observed during the COVID-19 pandemic. The results are similar to those reported by Latin American, European and North American countries.

DRUL for school: Opening Pre-K with safe, simple, sensitive saliva testing for SARS-CoV-2.

To address the need for simple, safe, sensitive, and scalable SARS-CoV-2 tests, we validated and implemented a PCR test that uses a saliva collection kit use at home. Individuals self-collected 300 µl saliva in vials containing Darnell Rockefeller University Laboratory (DRUL) buffer and extracted RNA was assayed by RT-PCR (the DRUL saliva assay). The limit of detection was confirmed to be 1 viral copy/µl in 20 of 20 replicate extractions. Viral RNA was stable in DRUL buffer at room temperature up to seven days after sample collection, and safety studies demonstrated that DRUL buffer immediately inactivated virus at concentrations up to 2.75x106 PFU/ml. Results from SARS-CoV-2 positive nasopharyngeal (NP) swab samples collected in viral transport media and assayed with a standard FDA Emergency Use Authorization (EUA) test were highly correlated with samples placed in DRUL buffer. Direct comparison of results from 162 individuals tested by FDA EUA oropharyngeal (OP) or NP swabs with co-collected saliva samples identified four otherwise unidentified positive cases in DRUL buffer. Over six months, we collected 3,724 samples from individuals ranging from 3 months to 92 years of age. This included collecting weekly samples over 10 weeks from teachers, children, and parents from a pre-school program, which allowed its safe reopening while at-risk pods were quarantined. In sum, we validated a simple, sensitive, stable, and safe PCR-based test using a self-collected saliva sample as a valuable tool for clinical diagnosis and screening at workplaces and schools.

A Facile One-Pot Synthesis of Versatile PEGylated Platinum Nanoflowers and Their Application in Radiation Therapy.

Nanomedicine has stepped into the spotlight of radiation therapy over the last two decades. Nanoparticles (NPs), especially metallic NPs, can potentiate radiotherapy by specific accumulation into tumors, thus enhancing the efficacy while alleviating the toxicity of radiotherapy. Water radiolysis is a simple, fast and environmentally-friendly method to prepare highly controllable metallic nanoparticles in large scale. In this study, we used this method to prepare biocompatible PEGylated (with Poly(Ethylene Glycol) diamine) platinum nanoflowers (Pt NFs). These nanoagents provide unique surface chemistry, which allows functionalization with various molecules such as fluorescent markers, drugs or radionuclides. The Pt NFs were produced with a controlled aggregation of small Pt subunits through a combination of grafted polymers and radiation-induced polymer cross-linking. Confocal microscopy and fluorescence lifetime imaging microscopy revealed that Pt NFs were localized in the cytoplasm of cervical cancer cells (HeLa) but not in the nucleus. Clonogenic assays revealed that Pt NFs amplify the gamma rays induced killing of HeLa cells with a sensitizing enhancement ratio (SER) of 23%, thus making them promising candidates for future cancer radiation therapy. Furthermore, the efficiency of Pt NFs to induce nanoscopic biomolecular damage by interacting with gamma rays, was evaluated using plasmids as molecular probe. These findings show that the Pt NFs are efficient nano-radio-enhancers. Finally, these NFs could be used to improve not only the performances of radiation therapy treatments but also drug delivery and/or diagnosis when functionalized with various molecules.

Uptake and excretion dynamics of gold nanoparticles in cancer cells and fibroblasts.

Radiotherapy is one of the main treatments used to fight cancer. A major limitation of this modality is the lack of selectivity between cancerous and healthy tissues. One of the most promising strategies proposed in this last decade is the addition of nanoparticles with high-atomic number to enhance radiation effects in tumors. Gold nanoparticles (AuNPs) are considered as one of the best candidates because of their high radioenhancing property, simple synthesis and low toxicity. Ultra small AuNPs (core size of 2.4 nm and hydrodynamic diameter of 4.5 nm) covered with dithiolated diethylenetriaminepentaacetic acid (Au@DTDTPA) are of high interest because of their properties to bind MRI active or PET active compounds at their surface, to concentrate in some tumors and be eliminated via renal clearance thanks to their small size. These key figures make Au@DTDTPA the best candidate to develop image-guided radiotherapy. Surprisingly the capacity of the nanoparticles to penetrate cells, an important issue to predict radioenhancement, has not been established yet. Here, we report the uptake dynamics, internalization routes and excretion dynamics of Au@DTDTPA nanoparticles in various cancer cell lines including glioblastoma (U87-MG), chordoma (UM-Chor1), cervix (HeLa), prostate (PC3), and pancreatic (BxPC-3) cell lines as well as fibroblasts (Dermal fibroblasts). This study demonstrates a strong cell line dependence of the nanoparticle uptake and excretion dynamics. Different pathways of cell internalization evidenced here explain this dependence. As a major finding, the retention of Au@DTDTPA nanoparticles was found to be higher in cancer cells than in fibroblasts. This result strengthens the strategy of using nanoagents to improve tumor selectivity of radiation treatments. In particular Au@DTDTPA nanoparticles are good candidates to improve the treatment of radioresitant gliobastoma, pancreatic and prostate cancer in particular. In conclusion, the variability of cell-to-nanoparticle interaction is a new parameter to consider in the choice of nanoagents in a combined treatment.

[Balloon pulmonary angioplasty for the treatment of chronic thromboembolic pulmonary hypertension]. / Angioplastía con balón para el tratamiento de la hipertensión arterial pulmonar por enfermedad tromboembólica crónica. Resultados hemodinámicos y clínicos inmediatos.

BACKGROUND: Balloon pulmonary angioplasty (BPA) is a therapeutic alternative for patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH). AIM: To report the initial experience with the "refined BPA technique" with the use of intravascular images. PATIENTS AND METHODS: Between June 2015 and June 2016 we selected fourteen patients with CTEPH who were considered candidates for BPA. Lesions targeted for treatment were further analyzed using intravascular imaging with optical frequency domain imaging (OFDI). We report the immediate hemodynamic results and four weeks of follow-up of the first eight patients of this series. RESULTS: We performed 16 BPA in eight patients aged 61 ± 14 years (88% women). Mean pulmonary artery pressure (PAPm) was 48.6 ± 5.8 mmHg. Success was achieved in seven patients (88%). A mean of 2.3 segments per patient were intervened in 11 sessions (1.6 sessions/ patient). Only one patient developed lung reperfusion injury. No mortality was associated with the procedure. After the last BPA session, PAPm decreased to 37.4 ± 8.6 mmHg (p=0.02). Pulmonary vascular resistance (RVP) decreased from 858,6 ± 377,0 at baseline to 516,6 ± 323,3 Dynes/sec/cm-5 (p<0.01) and the cardiac index increased from 2.4±0.6 at baseline to 2.8±0.3 L/min/m2 (p=0.01). At 4 weeks after the last BPA, WHO functional class improved from 3.3±0.5 to 2.5±0.5 (p<0,01) and six minutes walking distance from 331±92 to 451±149 m (p=0.01). CONCLUSIONS: BPA guided by OFDI for the treatment of inoperable CTEPH patients is a safe alternative with excellent immediate hemodynamic and clinical results.

Angioplastía con balón para el tratamiento de la hipertensión arterial pulmonar por enfermedad tromboembólica crónica. Resultados hemodinámicos y clínicos inmediatos / Balloon pulmonary angioplasty for the treatment of chronic thromboembolic pulmonary hypertension

Background: Balloon pulmonary angioplasty (BPA) is a therapeutic alternative for patients with inoperable chronic thromboembolic pulmonary hypertension (CTEPH). Aim: To report the initial experience with the "refined BPA technique" with the use of intravascular images. Patients and Methods: Between June 2015 and June 2016 we selected fourteen patients with CTEPH who were considered candidates for BPA. Lesions targeted for treatment were further analyzed using intravascular imaging with optical frequency domain imaging (OFDI). We report the immediate hemodynamic results and four weeks of follow-up of the first eight patients of this series. Results: We performed 16 BPA in eight patients aged 61 ± 14 years (88% women). Mean pulmonary artery pressure (PAPm) was 48.6 ± 5.8 mmHg. Success was achieved in seven patients (88%). A mean of 2.3 segments per patient were intervened in 11 sessions (1.6 sessions/ patient). Only one patient developed lung reperfusion injury. No mortality was associated with the procedure. After the last BPA session, PAPm decreased to 37.4 ± 8.6 mmHg (p=0.02). Pulmonary vascular resistance (RVP) decreased from 858,6 ± 377,0 at baseline to 516,6 ± 323,3 Dynes/sec/cm−5 (p<0.01) and the cardiac index increased from 2.4±0.6 at baseline to 2.8±0.3 L/min/m2 (p=0.01). At 4 weeks after the last BPA, WHO functional class improved from 3.3±0.5 to 2.5±0.5 (p<0,01) and six minutes walking distance from 331±92 to 451±149 m (p=0.01). Conclusions: BPA guided by OFDI for the treatment of inoperable CTEPH patients is a safe alternative with excellent immediate hemodynamic and clinical results.

Lactate clearance: prognostic mortality marker in trauma patients / La depuración de lactato: marcador pronóstico de mortalidad en pacientes traumatizados

Abstract Introduction: High lactate values are associated with adverse outcomes in almost all clinical situations, lactate levels above 2 mmol/L are proposed as an early and reliable marker of tissue hypoperfusion, and lactate clearance during treatment has also been proposed during resuscitation as a prognostic factor. Objective: To determine the association between the initial value of lactate and its clearance after 6 and 24 hours in trauma patients with mortality. Materials and methods: A subanalysis of a prospective cohort collected between March 2014 and October 2016 was carried out at the San Vicente Fundación University Hospital (Medellin, Colombia), with trauma patients over 18 years of age. Lactate and clinical variables were measured at admission, at 6 and at 24hours. The association of lactate levels at admission and clearance with in hospital mortality was estimated, using logistic regression models. Results: A total of 251 patients met the inclusion criteria, 15.5% died, 45.4% required admission to intensive care, in patients who died the lactate at admission was 4.6mmol/L (Interquartile range = 2.9-6.9). The adjusted logistic regression model showed that lactate on admission, lactate clearance of 50% (0-24hours), trauma mechanism, and Sequential Organ Failure Assessment score were independent factors associated with mortality. Conclusion: High values of lactate at admission are associated with greater probability of dying and its clearance is an independent factor of mortality in those who enter with high lactate values.

Resumen Introducción: Valores elevados de lactato se relacionan con desenlaces adversos en casi todas las situaciones clínicas, los niveles de lactato por encima de 2mmol/L se proponen como marcador temprano y confiable de hipoperfusión tisular, igualmente se ha propuesto la depuración de lactato durante la reanimación como factor pronóstico. Objetivo: Determinar en pacientes traumatizados la asociación del valor inicial de lactato y su depuración después de 6 y 24 horas con mortalidad. Materiales y métodos: Se realizó un sub-análisis de una cohorte prospectiva recolectada entre marzo de 2.014 y octubre de 2.016 en el Hospital Universitario San Vicente Fundación (Medellín, Colombia), con pacientes mayores de 18 años poli traumatizados. Se midió el lactato y las variables clínicas al ingreso, a la hora 6 y a las 24. Se estimó la asociación con mortalidad hospitalaria, los niveles de lactato al ingreso y su depuración, mediante modelos de regresión logística. Resultados: 251 pacientes cumplieron criterios de inclusión, el 15.5% fallecieron, el 45.4% requirieron ingreso a cuidados intensivos, en pacientes que murieron el lactato al ingreso fue de 4,6 mmol/L (IQR=2,9-6,9), en el modelo de regresión logística ajustado se encontró que el lactato al ingreso, la depuración de lactato del 50% (0-24 horas), el mecanismo de trauma y el puntaje de SOFA fueron factores independientes asociados con mortalidad. Conclusión: Valores altos de lactato al ingreso se asocian con mayor probabilidad de morir y en quienes ingresan con valores de lactato elevados, su depuración es un factor independiente de mortalidad.

Valoración de la variabilidad de la frecuencia cardiaca en pacientes con hipertensión arterial sistémica tratados mediante ablación renal por radiofrecuencia. Serie de casos / Assessment of the variability of the cardiac frequency in patients with systemic arterial hypertension treated through renal ablation by radio frequency. Series of cases

Resumen Introducción La hipertensión arterial sistémica refractaria es la presión arterial en el consultorio por encima de la meta apropiada a pesar del uso de tres o más antihipertensivos, uno de los cuales es un diurético; la denervación renal por ablación por radiofrecuencia es un tratamiento para este padecimiento, el cual es efectivo y seguro. Consideramos que la denervación disminuye el tono del sistema nervioso autónomo a nivel renal (eje renina angiotensina aldosterona), por lo que el resultado será la disminución de la presión arterial sin afectar la variabilidad de la frecuencia cardiaca. Objetivo Determinar si existe modificación en la variabilidad de la frecuencia cardiaca en pacientes con hipertensión arterial sistémica refractaria que son tratados mediante denervación renal por radiofrecuencia con catéter. Material y métodos Estudio observacional, descriptivo y analítico de pacientes con hipertensión arterial sistémica refractaria que fueron tratados mediante ablación renal por radiofrecuencia con catéter. Se midió la variabilidad de la frecuencia cardiaca en el dominio temporal y frecuencial, antes y dos meses después del procedimiento. El análisis estadístico de resultados se hizo con la prueba t de Student para muestras relacionadas. Resultados Fueron elegibles nueve pacientes, sólo se incluyeron seis pacientes con hipertensión arterial sistémica refractaria tratados mediante ablación renal por radiofrecuencia en el dominio temporal para la desviación estándar de los intervalos NN (SDNN), se observó un incremento estadísticamente no significativo (7 ms, p = 0.58). Conclusión En los seis pacientes con hipertensión arterial sistémica refractaria tratados mediante ablación renal por radiofrecuencia se observó, dos meses posteriores al procedimiento, que la variabilidad de la frecuencia cardiaca en el dominio temporal para la desviación estándar de los intervalos NN (SDNN) se incrementó 7 ms, siendo estadísticamente no significativo (p = 0.58).

Abstract Introduction Refractory systemic arterial hypertension is the blood pressure above the appropriate goal despite the use of three or more antihypertensive drugs, one of which is a diuretic; renal denervation by radiofrequency ablation, is a treatment for this condition, which is effective and safe. We consider that denervation decreases the tone of the autonomic nervous system at the renal level (renin angiotensin aldosterone axis), so that the result will be a decrease in blood pressure without affecting the variability of the heart rate. Objective To determine if there is a change in the variability of heart rate in patients with refractory systemic arterial hypertension who are treated by radiofrequency renal denervation with catheter. Material and methods Observational, descriptive and analytical study of patients with refractory systemic arterial hypertension who were treated by radiofrequency renal ablation with catheter. The variability of the heart rate in the temporal and frequency domain was measured before and two months after the procedure. The statistical analysis of results was by Student's t-test for related samples. Results Nine patients were eligible, only six patients with refractory systemic arterial hypertension treated by radiofrequency renal ablation were included, in the domain temporal domain for the standard deviation of the NN intervals (SDNN), a statistically non-significant increase was observed (7 ms, p = 0.58). Conclusion In the six patients with refractory systemic arterial hypertension treated by radiofrequency renal ablation, it was observed two months after the procedure, that the variability of the heart rate in the time domain for the standard deviation of the NN intervals (SDNN), it increased 7 ms, being statistically non-significant (p = 0.58).

Antibiotics has more impact on mortality than other early goal-directed therapy components in patients with sepsis: An instrumental variable analysis.

PURPOSE: To estimate the effect of each of the EGDT components, as well as of the antibiotics, on length-of-stay and mortality. METHODS: Prospective cohort in three hospitals. Adult patients admitted by the Emergency Rooms (ER) with infection and any of systolic blood pressure < 90 mmHg or lactate >4 mmol/L. An instrumental analysis with hospital of admission as the instrumental variable was performed to estimate the effect of each intervention on hospital mortality and secondary outcomes. RESULTS: Among 2587 patients evaluated 884 met inclusion criteria, with a hospital mortality rate of 17% (n = 150). In the instrumental analysis, the only intervention associated with an absolute reduction in mortality (21%) was the use of antibiotics in the first 3 h. In patients with lactate values ≥4 mmol/L in the ER, a non-decrease of at least 10% at six hours was independently associated with mortality (OR = 3.1; 95%CI = 1.5-6.2). CONCLUSIONS: Among patients entering ER with infection and shock or hypoperfusion criteria, the use of appropriate antibiotics in the first 3 h is the measure that has the greatest impact on survival. In addition, among patients with hyperlactatemia >4 mmol/L, the clearance of >10% of lactate during resuscitation is associated with better outcomes.

Perfil antropométrico de basquetbolistas sub-14 chilenos / Anthropometric profile of Chilean under-14 basketball players

La antropometría es un instrumento clave para determinar cambios producidos por el entrenamiento y la edad, así como una herramienta para detectar talentos deportivos. El objetivo de esta investigación fue describir las características antropométricas de basquetbolistas varones seleccionados chilenos sub-14 durante el año 2017. Se evaluaron 28 deportistas con una edad promedio de 14.14 ± 0.36 [13.33-14.63] los cuales participaron del proceso de concentración de la Selección Nacional. Se evaluaron 25 variables antropométricas. Se calculó la composición corporal pentacompartimental, el somatotipo y la proporcionalidad. Se utilizó estadística descriptiva para la caracterización de los deportistas. Se encontró que los basquetbolistas sub-14 chilenos presentan un porcentaje de masa muscular elevado, un somatotipo mesoectomórfico y proporciones (score Z) negativas respecto a su altura.

Anthropometry is a key instrument to find body changes produced by sports training and age. It is also being used to determine young skilled athletes. The aim of this study was to determine the anthropometric characteristics of Chilean male basketball players under 14 years of age during 2017. We measured 28 athletes with an average age of 14.14 ± 0.36 [13.3314.63] who participated in the National Chilean Team concentration process. In the study, 25 anthropometric variables were measured including penta compartimental body composition, somatotype and proportionality were estimated. Statistical description was applied for the athletes characterization. The analysis showed that Chilean U-14 basketball players have a high percentage of muscle mass, a meso-ectomorphic somatotype and negative proportions (Z score) regarding their height.

Manifestaciones psiquiátricas de la neurosífilis: reporte de un caso de parálisis / Psychiatric manifestations of neurosyphilis: A case report of progressive general paralysis

A pesar de que la neurosífilis es poco frecuente en la actualidad, esta entidad no ha desaparecido. Las manifestaciones psiquiátricas de la parálisis general progresiva se pueden presentar a través de una gran variedad de síndromes tales como psicosis, manía y demencia. Se presenta el caso de un varón de 56 años de edad con inicio insidioso de delirios de daño y de grandeza, alucinaciones auditivas y alteraciones conductuales tales como reacciones impulsivas y agresividad. Los análisis serológicos y de líquido cefalorraquídeo (LCR) revelaron la presencia de Treponema pallidum. El paciente recibió tratamiento antibiótico, así como psicofarmacológico, con mejoría notable de los síntomas psicóticos, maniacos y conductuales. Este caso enfatiza la importancia de descartar neurosífilis en presencia de manifestaciones psiquiátricas pleomórficas y evolución atípica, así como deterioro de funciones mentales superiores.

Although neurosyphilis is infrequently seen nowadays, it cannot be said that it has disappeared. The psychiatric manifestations of syphilis-related progressive general paralysis can adopt a wide variety of presentations, including psychosis, mania and dementia. The case of a 56-year-old male patient is presented; it has an insidious onset of delusions of damage and grandiosity, auditory hallucinations and behavioral changes such as increased impulsivity and aggressiveness. Serological and cerebrospinal fluid laboratory analyses revealed the presence of Treponema pallidum. The patient received antibiotic and psychopharmacological treatment, showing significant improvement of all his symptoms. This case emphasizes the importance of ruling out neurosyphilis in the presence of pleomorphic or atypical psychiatric manifestations of atypical clinical course as well as a decline of superior mental functions.

Utilidad de la angiografía intracoronaria con microcatéter para evitar fenómeno de no reflujo en la angioplastia primaria / Utility of the intracoronary angiography with microcatheter to avoid no reflow phenomenon in primary angioplasty

Resumen Introducción La oclusión coronaria aguda, asociada a alta tasa de morbimortalidad en el infarto agudo del miocardio con elevación del segmento ST (IAMCEST), representa un desafío para el intervencionista cuando desconoce el importe de carga de trombo y las características distales a la oclusión (obstrucción microvascular (OMV), estenosis distal) que complican la angioplastia primaria (ACTP) y el fenómeno de no reflujo (FNR), el cual tiene una incidencia reportada de 20 a 40%. Objetivos Evaluar la eficacia de la angiografía distal con microcatéter al orientar una estrategia terapéutica individualizada con la finalidad de prevenir el FNR en oclusión coronaria aguda por IAMCEST en ACTP. Material y métodos Se incluyeron 70 pacientes con IAMCEST. Se realizó angiografía con microcatéter distal a la obstrucción y se eligió la estrategia terapéutica en la angioplastia de conformidad con hallazgos: estenosis, carga de trombo y OMV. Posteriormente se evaluó la incidencia de FNR al finalizar la ACTP. Resultados Reporte de 70 pacientes, la mayoría hombres (80%), clase Killip-Kimball I (95%), con afección de la arteria coronaria derecha en 57% de ellos y de la descendente anterior en 37%. Trombo distal presente en 47% de los pacientes estudiados, se observó en 21% de los casos que la longitud de obstrucción fue mayor de 30 mm, disección de las arterias también en 21%, OMV presente en 41% y 25% con estenosis distal. Estrategias terapéuticas utilizadas: se aplicó stent con fármaco en 81% de los pacientes, balón largo en 93% y trombolítico en 30%. Se observó una incidencia del FNR de 18.6%. Conclusiones En IAMCEST la técnica propuesta disminuye el FNR en comparación con lo reportado. La obstrucción > 30 mm es factor independiente de FNR, por lo que en estos casos recomendamos el uso de esta técnica y balón largo.

Abstract Introduction The acute coronary occlusion associated with a high valuation of morbimortalidad in the acute infarction of the myocardium with elevation of the ST segment (STEMI), represents a challenge for the interventionist, due the unknown amount of thrombus load and its characteristics beyond the occlusion (microvascular obstruction (MVO), distal stenosis), which leads to complicate the primary angioplasty (PTCA) and to the no reflow phenomenon (NFP), which has an overall incidence reported from 20 to 40%. Objectives To evaluate the efficacy of the distal coronary angiography with microcatheter, that leads to an individualized therapeutic strategy, with the purpose of prevent the NFP in the accute coronary occlusion in STEMI treated with PTCA. Material and methods 70 patients were included with STEMI. We performed coronary angiography with microcatheter distal to the obstruction, and the therapeutic strategy was chosen in accordance with findings: stenosis, thrombus amount or MVO. After the PTCA were performed, we evaluated the NFP incidence. Results Report of 70 patients, the majority men (80%), class Killip Kimbal I (95 %), with disease of the right coronary artery in 57%, and anterior descending coronary artery in 37%. Distal thrombus was present in 47% of the studied patients. An obstruction length of more than 30 mm was observed in 21% of the cases, also we observed dissection of the arteries in a 21%, MVO was presented in 41%, and distal stenosis in 25%. Used therapeutic strategies: It was applied medicated stent in 81% of the patients, long balloon in 93%, and thrombolytic therapy in 30%. We observed a NFP incidence of 18.6 %. Conclusions The diagnostic and therapeutic approach for STEMI that this study recommends, diminishes the NFP in comparison with reported. An obstruction > 30 mm is an independent factor for NFP, therefore in these cases we recommend use the described diagnostic approach and long balloon.

Association of Clinical Hypoperfusion Variables With Lactate Clearance and Hospital Mortality.

BACKGROUND: Lactate has shown utility in assessing the prognosis of patients admitted to the hospital with confirmed or suspected shock. Some findings of the physical examination may replace it as screening tool. We have determined the correlation and association between clinical perfusion parameters and lactate at the time of admission; the correlation between the change in clinical parameters and lactate clearance after 6 and 24 h of resuscitation; and the association between clinical parameters, lactate, and mortality. METHODS: Prospective cohort study of adult patients hospitalized in the emergency room with infection, polytrauma, or other causes of hypotension. We measured serum lactate, capillary refill time, shock index, and pulse pressure at 0, 6, and 24 h after admission. A Spearman's correlation was performed between clinical variables and lactate levels, as well as between changes in clinical parameters and lactate clearance. The operative characteristics of these variables were determined by area under the receiver operating characteristic curve analysis and the association between lactate, clinical variables, and mortality through logistic regression. RESULTS: A total of 1,320 patients met the inclusion criteria, 66.7% (n = 880) confirmed infection, 19% (n = 251) polytrauma, and 14.3% (n = 189) another etiology. No significant correlation was found between any clinical variable and lactate values (r < 0.28). None of the variable had an adequate discriminatory capacity to detect hyperlactatemia (AUC < 0.62). In the multivariate model, lactate value at admission was the only variable independently associated with mortality (OR 1.2; 95% CI = 1.1-1.1). CONCLUSIONS: Among patients with hypoperfusion risk or shock, no correlation was found between clinical variables and lactate. Of the set of parameters collected, lactate at admission was the only independent marker of mortality.

Efficacy of an orlistat-resveratrol combination for weight loss in subjects with obesity: A randomized controlled trial.

OBJECTIVE: To evaluate the efficacy of an orlistat-resveratrol (O-R) combination in subjects with obesity over a 6-month period. METHODS: This study was a double-blind, parallel, randomized controlled clinical trial. Patients fulfilling the selection criteria (age from 20 to 60 years and body mass index (BMI) ≥30 and ≤39.9 kg/m(2) ) consumed an energy-reduced diet with 500 fewer calories than their usual diet for 2 weeks. Then the participants were randomly assigned to four groups, placebo, resveratrol, orlistat, or O-R, and they consumed the energy-reduced diet for 6 months. The study consisted of seven visits. During each visit, a 24-h recall was performed, along with measurements of anthropometric and serum biochemical parameters. RESULTS: A total of 161 participants were selected. Of these, 84 participants completed the study. A significant weight loss of -6.82 kg (95% CI -8.37 to -5.26) was observed in the O-R group compared with -3.50 kg (-5.05 to -1.95, P = 0.021) in the placebo group. In contrast, the -6.02 kg (-7.68 to -4.36) orlistat and -4.68 kg (-6.64 to -2.71) resveratrol monotherapy losses did not significantly differ from the placebo. Significant decreases in BMI, waist circumference, fat mass, triglycerides, leptin, and leptin/adiponectin ratio were observed with the O-R combination. CONCLUSIONS: The O-R combination was the most effective weight loss treatment.