Application of Microfracture Analysis to Fatigue Fractures in Materials through Non-Destructive Tests.

Fatigue fractures in materials are the main cause of approximately 80% of all material failures, and it is believed that such failures can be predicted and mathematically calculated in a reliable manner. It is possible to establish prediction modalities in cases of fatigue fractures according to three fundamental variables in fatigue, such as volume, number of fracture cycles, as well as applied stress, with the integration of Weibull constants (length characteristic). In this investigation, mechanical fatigue tests were carried out on specimens smaller than 4 mm2, made of different industrial materials. Their subsequent analysis was performed through precision computed tomography, in search for microfractures. The measurement of these microfractures, along with their metrics and classifications, was recorded. A convolutional neural network trained with deep learning was used to achieve the detection of microfractures in image processing. The detection of microfractures in images with resolutions of 480 × 854 or 960 × 960 pixels is the primary objective of this network, and its accuracy is above 95%. Images that have microfractures and those without are classified using the network. Subsequently, by means of image processing, the microfracture is isolated. Finally, the images containing this feature are interpreted using image processing to obtain their area, perimeter, characteristic length, circularity, orientation, and microfracture-type metrics. All values are obtained in pixels and converted to metric units (µm) through a conversion factor based on image resolution. The growth of microfractures will be used to define trends in the development of fatigue fractures through the studies presented.

Experimental Analysis of Fiber Reinforcement Rings' Effect on Tensile and Flexural Properties of Onyx™-Kevlar® Composites Manufactured by Continuous Fiber Reinforcement.

Additive manufacturing of composite materials is progressing in the world of 3D printing technologies; composite materials allow the combination of the physical and mechanical properties of two or more constituents to create a new material that meets the required properties of several applications. In this research, the impact of adding Kevlar® reinforcement rings on the tensile and flexural properties of the Onyx™ (nylon with carbon fibers) matrix was analyzed. Parameters such as infill type, infill density and fiber volume percentage were controlled to determine the mechanical response in tensile and flexural tests of the additive manufactured composites. The tested composites showed an increment of four times the tensile modulus and 1.4 times the flexural modulus of pure Onyx™ matrix when compared with that of the Onyx™-Kevlar®. The experimental measurements demonstrated that Kevlar® reinforcement rings can increase the tensile and flexural modulus of Onyx™-Kevlar® composites using low fiber volume percentages (lower than 19% in both samples) and 50% of rectangular infill density. However, the appearance of some defects, such as delamination, was observed and should be further analyzed to obtain products that are errorless and can be reliable for real functions as in automotive or aeronautical industries.

Severe Referred Shoulder Pain Following Revision Fundoplication From a Stich on the Diaphragm.

Complications following fundoplication surgery for hiatal hernias are rare. Herein, we present the case of a 61-year-old woman who underwent a Nissen fundoplication, complicated by dysphagia, and a revision modified Toupet fundoplication for a hiatal hernia, after which she began to experience severe prandial referred left shoulder pain that was refractory to medical management. We hypothesized that a diaphragmatic suture placed during the revision fundoplication could be the source of the pain, and we elected to remove the suture, resulting in resolution of the pain. This pain remained resolved at the most recent follow-up on postoperative week six, and the patient had no further concerns.

Upper motor neurons are a target for gene therapy and UCHL1 is necessary and sufficient to improve cellular integrity of diseased upper motor neurons.

There are no effective cures for upper motor neuron (UMN) diseases, such as amyotrophic lateral sclerosis (ALS), primary lateral sclerosis, and hereditary spastic paraplegia. Here, we show UMN loss occurs independent of spinal motor neuron degeneration and that UMNs are indeed effective cellular targets for gene therapy, which offers a potential solution especially for UMN disease patients. UCHL1 (ubiquitin C-terminal hydrolase-L1) is a deubiquitinating enzyme crucial for maintaining free ubiquitin levels. Corticospinal motor neurons (CSMN, a.k.a UMNs in mice) show early, selective, and profound degeneration in Uchl1nm3419 (UCHL1-/-) mice, which lack all UCHL1 function. When UCHL1 activity is ablated only from spinal motor neurons, CSMN remained intact. However, restoring UCHL1 specifically in CSMN of UCHL1-/- mice via directed gene delivery was sufficient to improve CSMN integrity to the healthy control levels. In addition, when UCHL1 gene was delivered selectively to CSMN that are diseased due to misfolded SOD1 toxicity and TDP-43 pathology via AAV-mediated retrograde transduction, the disease causing misfolded SOD1 and mutant human TDP-43 were reduced in hSOD1G93A and prpTDP-43A315T models, respectively. Diseased CSMN retained their neuronal integrity and cytoarchitectural stability in two different mouse models that represent two distinct causes of neurodegeneration in ALS.

Improving mitochondria and ER stability helps eliminate upper motor neuron degeneration that occurs due to mSOD1 toxicity and TDP-43 pathology.

BACKGROUND: Upper motor neurons (UMNs) are a key component of motor neuron circuitry. Their degeneration is a hallmark for diseases, such as hereditary spastic paraplegia (HSP), primary lateral sclerosis (PLS), and amyotrophic lateral sclerosis (ALS). Currently there are no preclinical assays investigating cellular responses of UMNs to compound treatment, even for diseases of the UMNs. The basis of UMN vulnerability is not fully understood, and no compound has yet been identified to improve the health of diseased UMNs: two major roadblocks for building effective treatment strategies. METHODS: Novel UMN reporter models, in which UMNs that are diseased because of misfolded superoxide dismutase protein (mSOD1) toxicity and TDP-43 pathology are labeled with eGFP expression, allow direct assessment of UMN response to compound treatment. Electron microscopy reveals very precise aspects of endoplasmic reticulum (ER) and mitochondrial damage. Administration of NU-9, a compound initially identified based on its ability to reduce mSOD1 toxicity, has profound impact on improving the health and stability of UMNs, as identified by detailed cellular and ultrastructural analyses. RESULTS: Problems with mitochondria and ER are conserved in diseased UMNs among different species. NU-9 has drug-like pharmacokinetic properties. It lacks toxicity and crosses the blood brain barrier. NU-9 improves the structural integrity of mitochondria and ER, reduces levels of mSOD1, stabilizes degenerating UMN apical dendrites, improves motor behavior measured by the hanging wire test, and eliminates ongoing degeneration of UMNs that become diseased both because of mSOD1 toxicity and TDP-43 pathology, two distinct and important overarching causes of motor neuron degeneration. CONCLUSIONS: Mechanism-focused and cell-based drug discovery approaches not only addressed key cellular defects responsible for UMN loss, but also identified NU-9, the first compound to improve the health of diseased UMNs, neurons that degenerate in ALS, HSP, PLS, and ALS/FTLD patients.

Shared Decision Making in Patients With Suspected Uncomplicated Ureterolithiasis: A Decision Aid Development Study.

OBJECTIVE: The objective was to develop a decision aid (DA) to facilitate shared decision making (SDM) around whether to obtain computed tomography (CT) imaging in patients presenting to the emergency department (ED) with suspected uncomplicated ureterolithiasis. METHODS: We used evidence-based DA development methods, including qualitative methods and iterative stakeholder engagement, to develop and refine a DA. Guided by the Ottawa Decision Support Framework, International Patient Decision Aid Standards (IPDAS), and a steering committee made up of stakeholders, we conducted interviews and focus groups with a purposive sample of patients, community members, emergency clinicians, and other stakeholders. We used an iterative process to code the transcripts and identify themes. We beta-tested the DA with patient-clinician dyads facing the decision in real time. RESULTS: From August 2018 to August 2019, we engaged 102 participants in the design and iterative refinement of a DA focused on diagnostic options for patients with suspected ureterolithiasis. Forty-six were ED patients, community members, or patients with ureterolithiasis, and the remaining were emergency clinicians (doctors, residents, advanced practitioners), researchers, urologists, nurses, or other physicians. Patients and clinicians identified several key decisional needs including an understanding of accuracy, uncertainty, radiation exposure/cancer risk, and clear return precautions. Patients and community members identified facilitators to SDM, such as a checklist of signs and symptoms. Many stakeholders, including both patients and ED clinicians, expressed a strong pro-CT bias. A six-page DA was developed, iteratively refined, and beta-tested. CONCLUSIONS: Using stakeholder engagement and qualitative inquiry, we developed an evidence-based DA to facilitate SDM around the question of CT scan utilization in patients with suspected uncomplicated ureterolithiasis. Future research will test the efficacy of the DA in facilitating SDM.

Periodic Event-Triggered Control strategy for a (3,0) mobile robot network.

This work deals with the development of a nonlinear Periodic Event-Triggered Control strategy employed to the consensus of a multi-vehicle autonomous system based on (3,0) mobile robots. First, the existence of the Control Lyapunov Function (CLF) applicable to the consensus problem is proven. This is subsequently used to develop event and feedback functions. The Periodic Event-Triggered Control ensures trajectories boundedness and convergence to consensus while a specific sampling period is provided. Also, the formation problem is addressed as an extension of the presented work. Experimental results show the performance of the proposed control strategy which reduces 99.78% the number of control updates compared to a continuous control law, resulting in energy saving for the information transfer from central control to the mobile robots.

La laparoscopía el nuevo estándar de oro para el tratamiento de quistes renales simples sintomáticos / Laparoscopy the new gold standard for the treatment simple symptomatic renal cysts

más frecuentes del riñón. Su tratamiento consiste en la exploración quirúrgica y marsupialización. La cirugía laparoscópica permite una mejor disección, exploración e identificación de la anatomía con trauma mínimo del paciente. OBJETIVO. Mostrar la experiencia en el tratamiento quirúrgico laparoscópico mínimamente invasivo del quiste renal simple sintomático. MATERIALES Y MÉTODOS. Estudio retrospectivo del tratamiento laparoscópico transperitoneal, se evaluó la seguridad de la técnica, complicaciones perioperatorias y resultados clínicos en el transcurso de un año. Se estudió 8 pacientes: 4 mujeres y 4 hombres, con diagnóstico de quistes renales simples sintomáticos, atendidos por el Servicio de Urología del Hospital de Especialidades Carlos Andrade Marín de Quito, Ecuador. CASOS CLÍNICOS. Se registró edad, sexo, antecedentes patológicos personales, comorbilidades, historia familiar, examen físico completo, exámenes de imagen y de laboratorio. RESULTADOS. La media de la edad fue de 57 años con un intervalo entre 39 y 77 años. La indicación de cirugía fue dolor en región lumbar ipsilateral, que no respondieron a los analgésicos convencionales. El tamaño de los quistes osciló entre 7-10 cm de diámetro. El tiempo operatorio medio fue de 71 minutos sin requerir conversión a cirugía abierta. Los pacientes fueron dados de alta en los primeros cinco días del postoperatorio y los drenajes extraídos dentro del primer día. CONCLUSIÓN. El tratamiento laparoscópico de quistes renales simples sintomáticos por vía transperitoneal fue exitoso en todos los casos. El abordaje permitió la extirpación de los quistes, con menor morbilidad, y con un mejor confort postoperatorio para los pacientes.

kidney. Its treatment consists of surgical exploration and marsupialization. Laparoscopic surgery allows a better dissection, exploration and identification of the anatomy with minimal patient trauma. OBJECTIVE. To show the experience in the minimally invasive laparoscopic surgical treatment of the symptomatic simple renal cyst. MATERIALS AND METHODS. Retrospective study of transperitoneal laparoscopic treatment, the safety of the technique, perioperative complications and clinical results over the course of a year were evaluated. 8 patients were studied: 4 women and 4 men, with diagnosis of symptomatic simple renal cysts, attended by the Urology Service of the Carlos Andrade Marín Specialty Hospital of Quito, Ecuador. CLINICAL CASES. Age, sex, personal pathological history, comorbidities, family history, complete physical examination, image and laboratory tests were recorded. RESULTS. The mean age was 57 years with an interval between 39 and 77 years. The indication for surgery was pain in the ipsilateral lumbar region, which did not respond to conventional analgesics. The size of the cysts ranged between 7-10 cm in diameter. The mean operative time was 71 minutes without requiring conversion to open surgery. The patients were discharged in the first five days of the postoperative period and the drains extracted within the first day. CONCLUSION. The laparoscopic treatment of simple symptomatic renal cysts by the transperitoneal route was successful in all cases. The approach allowed the removal of the cysts, with less morbidity, and with a better postoperative comfort for the patients.

[Efecto de un Plan de Mejora de Calidad y Seguridad Clínica en la incidencia de infección de sitio quirúrgico en apendicectomía. Estudio cuasi-experimental]. / Effect of a Plan for Quality Improvement and Clinical Safety in the incidence of surgical site infections in appendectomy. A quasi-experimental study.

OBJETIVO: Las infecciones de sitio quirúrgico se pueden evitar y los programas de control basados en paquetes de medidas preventivas son eficaces para reducir su incidencia. El objetivo de este estudio fue evaluar el efecto de un Plan de Mejora de Calidad y Seguridad Clínica del paciente intervenido de apendicectomía en la incidencia de infección del sitio quirúrgico. MÉTODO: Se realizó un estudio cuasi-experimental con análisis antes y después de la introducción de un Plan de Calidad y Seguridad Clínica. Se incluyeron pacientes intervenidos de apendicectomía. Se estudió la incidencia de infección del sitio quirúrgico durante los 30 días posteriores a la cirugía (periodo máximo de incubación de infección quirúrgica). Se evaluó el efecto de la intervención con la odds ratio (OR) ajustada con un modelo de regresión logística. RESULTADOS: Se incluyeron 606 pacientes, 267 en el periodo 2009-2010 (antes del plan) y 339 durante 2012-2013 (después del plan). La incidencia de infección del sitio quirúrgico descendió después del plan del 6 al 5.6% (OR: 0.72; intervalo de confianza del 95%: 0.33-1.56; p = 0.839). Hubo mayor cumplimiento de la profilaxis antibiótica, de la preparación prequirúrgica y de la adherencia a la higiene de manos tras la introducción de las medidas. CONCLUSIONES: Aunque la reducción de la incidencia de infección del sitio quirúrgico no presentó diferencias estadísticamente significativas tras las medidas adoptadas, se ha conseguido mejorar la administración de la profilaxis antibiótica, la adherencia a la higiene de manos y la preparación prequirúrgica. OBJECTIVE: Surgical site infections can be prevented. Control programs based on care bundle have proven to be effective in reducing its incidence. The objective of this study was to assess the effectiveness of a Plan for Quality Improvement and Clinical Safety in preventing the incidence of surgical site infection in patients undergoing appendectomy. METHOD: A quasi-experimental study was designed for analysis before and after the introduction of a Plan for Quality and Clinical Safety. Patients undergoing appendectomy were included. The incidence of surgical site infection was studied within 30 days from the time of surgery (maximum incubation period of surgical site infection). The effectiveness of the intervention was evaluated using the odds ratio (OR) adjusted with a logistic regression model. RESULTS: A total of 606 patients were included, of which 267 were operated in the period 2009-2010 (before the plan) and 339 in 2012-2013 (after the plan). The incidence of surgical site ­infection decreased after the plan from 6 to 5.6% (OR: 0.72; 95% confidence interval: 0.33-1.56; p = 0.839). There was greater compliance of antibiotic prophylaxis, preoperative preparation and adherence to hand hygiene after the introduction of the measures. CONCLUSIONS: Although the reduction in the incidence of surgical site infection after the measures adopted did not show statistical significant differences, important progress has been made in the compliance of antibiotic prophylaxis, adherence to hand hygiene and in the preoperative preparation.

[Effect of compliance with an antibiotic prophylaxis protocol in surgical site infections in appendectomies. Prospective cohort study]. / Efecto de la adecuación a protocolo de la profilaxis antibiótica en la incidencia de infección quirúrgica en apendicectomías. Estudio de cohortes prospectivo.

BACKGROUND: Antibiotic prophylaxis is the most suitable tool for preventing surgical site infection. This study assessed compliance with antibiotic prophylaxis in surgery for acute appendicitis, and the effect of this compliance on surgical site infection. MATERIAL AND METHODS: Prospective cohort study to evaluate compliance with antibiotic prophylaxis protocol in appendectomies. An assessment was made of the level of compliance with prophylaxis, as well as the causes of non-compliance. The incidence of surgical site infection was studied after a maximum incubation period of 30 days. The relative risk adjusted with a logistic regression model was used to assess the effect of non-compliance of prophylaxis on surgical site infection. RESULTS: The study included a total of 930 patients. Antibiotic prophylaxis was indicated in all patients, and administered in 71.3% of cases, with an overall protocol compliance of 86.1%. The principal cause of non-compliance was time of initiation. Cumulative incidence of surgical site infection was 4.6%. No relationship was found between inadequate prophylaxis compliance and infection (relative risk=0.5; 95% CI: 0.1-1.9) (P>.05). CONCLUSIONS: Compliance of antibiotic prophylaxis was high, but could be improved. No relationship was found between prophylaxis compliance and surgical site infection rate.

Stabilization of a (3,0) mobile robot by means of an event-triggered control.

Event-triggered control (ETC) is a sampling strategy that updates the control value only when some events related to the state of the system occurs. It therefore relaxes the periodicity of control updates without deteriorating the closed-loop performance. This paper develops a nonlinear ETC for the stabilization of a (3,0) mobile robot. The construction of an event function and a feedback function is carried out based on the existence of a stabilizing control law and a Control Lyapunov Function (CLF). The event function is dependent on the time derivative of the CLF and the feedback function results from the extension of Sontag's formula, which ensures asymptotic stability, smoothness everywhere and continuity at the equilibrium. Experimental results, compared with a computed torque control, validate the theoretical analysis.

Autotrasplante renal en hipertensión renovascular secundaria a aneurisma de arteria renal / Renal autotransplantation in renovascular hypertension secondary to renal artery aneurysm

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Serology for hepatitis B and C, HIV and syphilis in the initial evaluation of diabetes patients referred for an external nephrology consultation.

INTRODUCTION: Information is available regarding the prevalence and incidence of positive microbiological serology results both in the general population and in patients on haemodialysis in Spain. Nevertheless, little information is known regarding patients with diabetes attended in external nephrology consultations. OBJECTIVE: To evaluate the percentage of patients with positive serology results for hepatitis B and C, Human Immunodeficiency Virus (HIV), and syphilis in the initial assessment of patients referred to diabetic nephropathy external consultations. PATIENTS AND METHOD: Retrospective study of 500 patients assessed over the course of 5 years with the diagnosis of diabetic nephropathy originating in external consultations and for which hepatitis B, C, HIV, and syphilis serology had been requested. RESULTS: With regard to hepatitis B virus, 0.4% of patients had chronic hepatitis B, 10.2% had overcome the hepatitis and were in recovery, and 4.2% had received the hepatitis B vaccine. As for hepatitis C, 2.4% of the patients studied had antibodies against hepatitis C. With regard to syphilis, 0.8% of patients had positive serological results. No patients had positive HIV serology results. CONCLUSIONS: Despite major methodological limitations, this would be the first study to evaluate the microbiological serology of diabetic nephropathy patients treated in external consultations.

Serologías B, C, VIH y sífilis en la primera valoración de pacientes con diabetes remitidos a consulta externa de Nefrología / Serology for Hepatitis B and C, HIV and syphilis in the initial evaluation of diabetes patients referred for an external Nephrology consultation

Antecedentes: En España hay datos sobre prevalencia e incidencia de serologías microbiológicas positivas tanto en la población general como en pacientes en hemodiálisis. Sin embargo, se conocen pocos datos sobre los pacientes con diabetes atendidos en consulta externa de Nefrología. Objetivo: Valorar el porcentaje de pacientes con serologías positivas para hepatitis B y C, virus de inmunodeficiencia humana (VIH) y sífilis en la valoración inicial de los pacientes remitidos para estudio a la consulta externa de nefropatía diabética. Pacientes y métodos: Estudio retrospectivo de las serologías solicitadas con el diagnóstico de nefropatía diabética con origen en consultas externas de 500 pacientes valorados durante 5 años a los que se les había solicitado serologías de la hepatitis B, C, VIH y sífilis. Resultados: Respecto al virus de la hepatitis B, el 0,4 % de los pacientes tenían hepatitis B crónica, el 10,2 % había pasado la hepatitis y estaban curados y el 4,2 % había recibido la vacuna de la hepatitis B. En cuanto a la hepatitis C, el 2,4 % de los pacientes estudiados tenían anticuerpos frente hepatitis C. Respecto a la sífilis, el 0,8 % de los pacientes tenían serologías positivas. Ningún paciente presentó serologías positivas para VIH. Conclusiones: Si bien con grandes limitaciones metodológicas, este sería el primer estudio donde se revisan las serologías microbiológicas de pacientes con nefropatía diabética atendidos en consulta externa (AU)

Introduction: Information is available regarding the prevalence and incidence of positive microbiological serology results both in the general population and in patients on haemodialysis in Spain. Nevertheless, little information is known regarding patients with diabetes attended in external nephrology consultations. Objective: To evaluate the percentage of patients with positive serology results for hepatitis B and C, Human Immunodeficiency Virus (HIV), and syphilis in the initial assessment of patients referred to diabetic nephropathy external consultations. Patients and method: Retrospective study of 500 patients assessed over the course of 5 years with the diagnosis of diabetic nephropathy originating in external consultations and for which hepatitis B, C, HIV, and syphilis serology had been requested. Results: With regard to hepatitis B virus, 0.4% of patients had chronic hepatitis B, 10.2% had overcome the hepatitis and were in recovery, and 4.2% had received the hepatitis B vaccine. As for hepatitis C, 2.4% of the patients studied had antibodies against hepatitis C. With regard to syphilis, 0.8% of patients had positive serological results. No patients had positive HIV serology results. Conclusions: Despite major methodological limitations, this would be the first study to evaluate the microbiological serology of diabetic nephropathy patients treated in external consultations (AU)

Hipernatremia transitoria e hipodipsia en paciente con insuficiencia renal / Transitory hypernatraemia and hypodipsia in a renal failure patient

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[Clinical guideline for detection and diagnosis of hypertensive pregnancy disease]. / Guía de práctica clínica. Enfermedades hipertensivas del embarazo.

Hypertensive disorders in pregnancy (HDP) are the main complication and cause of maternal and perinatal death. Pre-eclampsia represents a 34%, according to the Secretaría de Salud de México. To offer the family physicians tools for the opportune detection and diagnosis of HDP a clinical guideline was developmented. Clinical questions were formulated and structured. A standardized sequence to search for Practice Guidelines, based on the key words: hypertensive disorders in pregnancy, pre-eclampsia. Tripdatabase, MDConsult, National Guideline Clearinghouse, Scottish Intercollegiate Guidelines Network, National Institute for Health and Clinical Excellence were used. In addition, Cochrane Library Plus, Science Direct and OVID were used. Most of the recommendations were taken from guidelines selected and supplemented with the remaining material. The information is expressed in levels of evidence and grade of recommendation according to the characteristics of the study design and type of publications. To reduce morbidity and mortality from HDP health professionals should identify risk factors; conduct a close monitoring and early diagnosis. It is essential to provide information to the pregnant patient on alarm data and behavior to follow. This clinical practice guide offers current evidence for screening and diagnosis of HDP in primary care.

Bacteriemia secundaria a procedimientos odontológicos periodontales / Bacteremia after periodontal procedures

Introducción. La bacteriemia ocurre con frecuenciadespués de la cirugía oral y de los procedimientos odontológicos.La periodontitis puede afectar a la incidencia y el espectrobacteriano de la bacteriemia. La enfermedad periodontalpuede ser un factor de riesgo significativo en eldesarrollo de enfermedades sistémicas. El objetivo del presenteestudio es evaluar la frecuencia de aparición de bacteriasaerobias y anaerobias en muestras de sangre despuésdel raspado y alisado radicular.Material y métodos. Fueron estudiados 13 pacientescon enfermedad periodontal crónica generalizada. Se tomarondos muestras de sangre para cultivo en diferentes momentos:pretratamiento e inmediatamente después del tratamientoodontológico.Resultados. En ninguno de los 13 pacientes se detectóbacteriemia previa al tratamiento. Después del raspado yalisado radicular la bacteriemia ocurrió en 10/13 (76,9%)pacientes con enfermedad periodontal. Predominaron lasbacterias anaerobias (Prevotella spp., Micromonas micros yFusobacterium nucleatum).Conclusiones. Nuestros hallazgos sugieren que los procedimientosperiodontales inducen bacteriemia y puedenrepresentar un riesgo para el desarrollo de complicacionessistémicas. El empleo de profilaxis antibiótica resulta crucialpara su prevención (AU)

Introduction. Bacteremia frequently occurs afteroral surgery and odontology procedures. Periodontitismay affect the incidence and bacterial spectrum of bacteremia.Periodontal disease may be a significant riskfactor for the development of certain systemic diseases.This study has aimed to evaluate the frequency of aerobicand anaerobic bacteria in the bloodstream followingscaling and root planing.Material and methods. Thirteen patients with generalizedchronic periodontitis were included in the study.Two samples of peripheral blood were drawn for cultureat different times: pre-treatment and immediately afterodontology treatment (full-mouth scaling).Results. None of the 13 patients had bacteremia beforethe procedures. Bacteremia after scaling occurred in10/13 (76.9 %) of periodontitis patients. The anaerobicbacteria (Prevotella spp., Micromonas micros and Fusobacteriumnucleatum) were the most predominant microorganism.Conclusions. Our findings suggest that periodontalprocedures induce bacteremia and may represent risk ofdeveloping systemic complications. The use of antibioticprophylaxis is crucial for its prevention (AU)

Concentración sérica de D-xilosa en niños con diarrea de evolución prolongada

Se estudiaron 50 pacientes, 25 eran eutróficos y 25 con Diarrea de Evolución Prolongada (DEP). A cada caso se le aplicó la prueba de absorción de D-Xilosa, administrando 5 gm de la sustancia en 100 ml de agua vía oral y midiendo la concentración sérica 1 hora después. Los niños eutróficos tuvieron promedio de D-xilosa en suero de 29.4 ñ 7.3 mg/dl, mientras que los afectados por DEP mostraron valor promedio de 19.0 ñ 8.6 mg/dl, p < 0.01. Se concluye que los niños con DEP, muestran una alteración en la absorción de esta pentosa