Therapeutic Effects of Dimethyl Fumarate on the Rat Model of Brain Ischemia

Abstract Blood-brain barrier (BBB) disruption, inflammation, and cell death are major pathogenic mechanisms in ischemic stroke. Dimethyl fumarate (DMF) has anti-inflammatory and immune-modulatory effects. So, this study aimed to elucidate the effects of DMF on brain ischemia in the middle cerebral artery occlusion (MCAO) model. 69 Sprague-Dawley male rats were allocated into a sham group that was just subjected to surgery stress; vehicle and DMF groups, after MCAO, received vehicle or 30 mg/kg DMF for three days. Neurological scores were evaluated every day. BBB disruption was evaluated by the extravasation of Evans blue. In addition to the measurement of brain water content, the total and infarct volume, numerical density, and the total number of neurons, non-neurons, and dead neurons in the right cortex were estimated by stereological methods. RT-PCR was done to analyze the expression levels of NF-κB and Nrf2. Although brain ischemia treatment with DMF did not have a significant effect on the infarction size, it improved neurobehavioral function, BBB disruption, cerebral edema, increased number of neurons, and expression of Nrf2. It also decreased the number of dead neurons and the expression of NF-κB. DMF beneficial effects on stroke may be mediated through both increase of the Nrf2 and decrease of NF-κB expression

Reflejo de Bezold-Jarish: una puesta al día en neurocirugía / Bezold-Jarisch reflex: an update in neurosurgery

El reflejo de Bezold Jarisch es un reflejo cardioinhibitorio que juega un papel en la homeostasis cardiovascular. Consiste en la triada dada por hipotensión, bradicardia y vasodilatación periférica que puede ser desencadenada tanto por estímulos mecánicos, como químicos. Se considera que el mecanismo eferente contrarresta e inhibe los efectos del influjo simpático y, por el contrario, activa los efectos producidos por el sistema parasimpático. Durante la cirugía neurológica, la disminución de la presión intracraneal posterior a la extracción de colgajo óseo en la craneotomía, el uso de medicamentos osmóticos para disminuir el edema cerebral e incluso la posición del paciente durante el procedimiento suponen situaciones más propensas a la aparición del reflejo.

The Bezold Jarisch reflex is a cardioinhibitory reflex that plays a role in cardiovascular homeostasis. It consists of a triad given by hypotension, bradycardia, and peripheral vasodilation that can be triggered by both mechanical and chemical stimuli. The efferent counteracting mechanism is considered to inhibit the effects of sympathetic influx and, conversely, activates the effects produced by the parasympathetic system. During neurological surgery, the decrease in intracranial pressure after bone flap extraction in the craniotomy, the use of osmotic medications to decrease cerebral edema and even the position of the patient during the procedure supposes situations more prone to reflex appearance

Síndrome de encefalopatía posterior reversible en el postparto. Estudio de caso / Posterior reversible encephalopathy syndrome in postpartum. Case study

El objetivo del presente ensayo es evaluar el síndrome de encefalopatía posterior reversible en el posparto en una paciente de 22 años, sin antecedentes patológicos personales, antecedentes ginecoobstetricos G(1), C(1), A(0), P(0). Antecedente quirúrgico, cesárea segmentaria de 39 semanas de gestación que es referida por presentar cuadro clínico de 24 horas posteriores a la cesárea segmentaria con dolor abdominal, vómitos y distensión abdominal por lo que es intervenida quirúrgicamente donde realizan re-lapartomias para control de daños. Es ingresada a la Unidad de terapia intensiva con apoyo ventilatorio y sin apoyo vasopresor. Se le realiza Angioresonancia evidenciándose, en secuencia s3DI MC, se identifican las arterias cerebrales anteriores, arterias cerebrales medias, arterias comunicantes posteriores, arteria comunicante anterior y el segmento P1, P2 de la arteria cerebral posterior bilateral con diámetros trayectos conservados. Sin embargo, llama la atención la disminución del diámetro de las arterias corticales de las arterias cerebrales posteriores segmento P3 bilateral. Se concluye que el conocimiento del PRES debe ser extenso y de amplia difusión, de modo que todos los actores relacionados con el cuidado de la salud materna identifiquen de forma precoz y oportuna la condición, reducir la morbimortalidad materna y las secuelas neurológicas a largo plazo(AU)

The objective of this trial is to evaluate the posterior reversible encephalopathy syndrome in the postpartum in a 22-yearold patient, with no personal medical history, G (1), C (1), A (0), P (0). Surgical history, segmental cesarean section of 39 weeks of gestation that is referred for presenting a clinical picture 24 hours after segmental cesarean section with abdominal pain, vomiting and abdominal distension, for which she undergoes surgery where re-lapartomies are performed for damage control. She admitted to the intensive care unit with ventilator support and without vasopressor support. Angioresonance performed, showing, in s3DI MC sequence, the anterior cerebral arteries, middle cerebral arteries, posterior communicating arteries, anterior communicating artery and segment P1, P2 of the bilateral posterior cerebral artery with preserved trajectory diameters identified. However, the reduction in the diameter of the cortical arteries of the bilateral posterior cerebral arteries segment P3 is striking. It concluded that the knowledge of PRES should be extensive and widely disseminated, so that all actors related to maternal health care identify the condition early and in a timely manner, reduce maternal morbidity and mortality and longterm neurological sequelae(AU)

Prevalencia de edema cerebral en pacientes con cetoacidosis diabética / Prevalence of cerebral edema among diabetic ketoacidosis patients

Introducción. El edema cerebral (EC) es la complicación más grave de la cetoacidosis diabética (CAD) en niños. La patogénesis del EC no se conoce con exactitud y su aparición ha sido relacionada con la terapia de rehidratación endovenosa en el tratamiento inicial.Objetivos. Estimar la prevalencia de EC en pacientes con CAD tratados en el Hospital General de Niños Pedro de Elizalde mediante rehidratación endovenosa y analizar potenciales factores de riesgo para el desarrollo de EC.Materiales y método. Estudio de diseño transversal para prevalencia y un análisis exploratorio para comparar las características clínicas y de laboratorio entre los pacientes con y sin EC. Se incluyeron pacientes de 1 a 18 años hospitalizados con diagnóstico de CAD desde el 1 de enero de 2005 hasta el 31 de diciembre de 2014.Resultados. Se analizaron 693 episodios de CAD en 561 historias clínicas. En 10 pacientes, se evidenció EC (el 1,44 %; intervalo de confianza del 95 %: 0,8-2,6). Los pacientes con EC presentaron mayor uremia (p < 0,001), menor presión de dióxido de carbono (p < 0,001) y menor natremia (p < 0,001) que aquellos pacientes sin EC.Conclusión. La prevalencia de EC en pacientes con CAD fue del 1,44 %, menor que la reportada en nuestro país (del 1,8 %). Los factores de riesgo al ingresar asociados a su desarrollo fueron la presencia de uremia elevada, hiponatremia e hipocapnia.

Introduction. Cerebral edema (CE) is the most severe complication of diabetic ketoacidosis (DKA) in children. There is no accurate knowledge of CE pathogenesis and its onset has been related to intravenous rehydration therapy during the initial treatment.Objectives. To estimate the prevalence of CE among DKA patients treated at Hospital General de Niños Pedro de Elizalde with intravenous rehydration and analyze potential risk factors for the development of CE.Materials and methods. Cross-sectional prevalence study and exploratory analysis to compare clinical and laboratory characteristics between patients with and without CE. Patients aged 1-18 years hospitalized with the diagnosis of DKA between January 1st, 2005 and December 31st, 2014 were included.Results. A total of 693 DKA events from 561 medical records were analyzed. Ten patients had evidence of CE (1.44 %; 95 % confidence interval: 0.8-2.6). Patients with CE had higher serum urea levels (p < 0.001), lower carbon dioxide pressure (p < 0.001), and lower serum sodium levels (p < 0.001) than those without CE.Conclusion. The prevalence of CE among DKA patients was 1.44 %, smaller than that reported in our country (1.8 %). The risk factors at admission associated with CE development were high serum urea levels, hyponatremia, and hypocapnia.

Hemorragia subaracnoidea posterior a descompresión Lumbar mínimamente invasiva. Presentación de un caso y revisión de la literatura / Subarachnoid hemorrhage after minimally invasive lumbar decompression. Case report and literature review

Introducción: Las lesiones durales son complicaciones frecuentes en la cirugía de columna. La fuga de liquidocefalorraquideo (LCR) puede originar hemorragia en todos los compartimientos del cerebro. La mayoría ocurre en venas ubicadas en región cerebelosa.Material y método: Se presenta un caso de hemorragia subaracnoidea posterior a una descompresión lumbar mínimamente invasiva asociada a desgarro dural. Resultados: Evoluciona en el postoperatorio con síntomas neurológicos de cefaleas y trastornos del sensorio por lo que se decide evaluarlo con estudios por imágenes vasculares cerebrales identificándose sangrado subaracnoideo.Discusión: El sitio más frecuente de hemorragia intracraneal posterior a una cirugía de columna es el cerebelo. El mecanismo de acción de este tipo de sangrados es desconocido y controversial, hay algunos reportes que sugieren que se trataría de un sangrado venoso. El síntoma más característico de este síndrome es la cefalea. Aunque se desconoce la etiología exacta, se postula que la pérdida de volumen de LCR causa una caída en la presión intracraneal, lo que lleva a un agrandamiento de los senos venosos durales que predisponen al paciente a un hematoma subdural espontáneoConclusión: La fuga de LCR, las alteraciones asociadas al edema cerebral en la hipotensión cerebral podría ser llave del mecanismo que desencadena una hemorragia subaracnoidea.

compartments of the brain. Most occur in veins located in the cerebellar region.Material and method: A case of subarachnoid hemorrhage after a minimally invasive lumbar decompression associated with dural tear is presented.Results: It evolves in the postoperative period with neurological symptoms of headaches and sensory disorders, so it is decided to evaluate it with studies by cerebral vascular images identifying subarachnoid bleeding.Discussion: The most frequent site of intracranial hemorrhage after spinal surgery is the cerebellum. The mechanism of action of this type of bleeding is unknown and controversial, there are some reports that suggest that it would be a venous bleeding. The most characteristic symptom of this syndrome is headache. Although the exact etiology is unknown, it is postulated that the loss of CSF volume causes a drop in intracranial pressure, which leads to an enlargement of the dural venous sinuses that predispose the patient to a spontaneous subdural hematomaConclusion: CSF leakage, alterations associated with cerebral edema in cerebral hypotension could be key to the mechanism that triggers a subarachnoid hemorrhage.

Un ejemplo de respuesta adaptativa integrada: la aclimatación humana a la altitud / An example of integrated adaptive response: human acclimatization to altitude

Se describen las respuestas fisiológicas que el ser humano desarrolla en respuesta a la exposición a la altitud geográfica. Se describen no sólo las alteraciones debidas a una mala coordinación de los ajustes fisiológicos desencadenados durante la aclimatación a la altura sino también sus manifestaciones clínicas más relevantes. Se detallan los mecanismos moleculares subyacentes a tales respuestas y cómo su mejor conocimiento puede permitir aplicar la exposición intermitente a hipoxia como una herramienta útil para la resolución o alivio de determinadas alteraciones y patologías.

We depict the physiological responses developed by the human body in response to the exposure to geographic altitude. The main alterations due to a noncoordinated setup of the physiological adjustments triggered during the acclimatization at altitude are also described, as its most relevant clinical manifestations. The molecular mechanisms underlying such responses are detailed, and how a better knowledge of these processes can allow us to apply intermittent exposure to hypoxia programs as a useful tool for the resolution or relief of certain disorders and pathologies.

Falla hepática aguda / Acute liver failure

La falla hepática aguda es la pérdida súbita de la función hepática en un corto plazo en un paciente sin enfermedad hepática previa, que se acompaña de coagulopatía y encefalopatía. Es una entidad rara con una incidencia muy baja que afecta especialmente a personas jóvenes. La principal causa en países desarrollados es la toxicidad por acetaminofén, mientras que en los países subdesarrollados son las hepatitis virales. El curso natural de la enfermedad es la progresión rápida a muerte por falla orgánica multisistémica, sepsis o edema cerebral. Después del diagnóstico, los pacientes deben remitirse tempranamente a la unidad de cuidado intensivo y a centros que ofrezcan trasplante hepático. La supervivencia sin trasplante hepático hasta hace pocos años era menor al 15%; sin embargo, en la actualidad puede ser hasta del 50%, dependiendo de la causa, y está relacionada con tratamientos específicos, la disponibilidad de trasplante hepático y una atención óptima en las unidades de cuidados intensivos. El trasplante hepático se constituye en el tratamiento de elección para los pacientes con falla hepática aguda y criterios de mal pronóstico del King's College.

Acute liver failure is the severe short-term liver function impairment in a patient without previous liver disease, which is accompanied by coagulopathy and encephalopathy. It is a rare condition with a very low incidence that affects young people. The leading cause in developed countries is acetaminophen toxicity, while in developing countries is mainly caused by viral hepatitis. The natural course is characterized by a rapid progression to death due to multisystemic organ failure, sepsis, or cerebral edema. After diagnosis, patients must be transferred to the intensive care unit and liver transplantation centers. Survival without liver transplantation until a few years ago was less than 15%; however, currently it can be up to 50% depending on the cause, and it is related to specific treatments, availability of liver transplantation and optimal care in the intensive care units. Liver transplantation is the treatment of choice for patients with acute liver failure and King's College criteria for poor prognosis.

Evaluation of Head Computed Tomography Assessment of Brain Swelling after Acute Traumatic Brain Injury: A Pilot study

Objective To evaluate the interobserver reliability of a new scale created for quantitatively assessing brain swelling in traumatic brain injury (TBI) patients using the computed tomography (CT) findings in three levels. Methods Computed tomography scans of severe head injury patients were randomly selected from a tertiary hospital image database and evaluated by independent groups of neurosurgeons, neurosurgery residents, radiologists, and intensivists from the same hospital. Each specialist assessed the tomographic findings, applying zero to six points in a new scale. The Kappa coefficient was calculated to assess interobserver agreement. Results The highest reliability coefficient was obtained by the neurosurgeons group (0.791; 95% confidence interval [CI]: 0.975­0.607; p < 0.001), followed by the neurosurgery residents group (0.402; 95%CI: 0.569­0.236; p < 0.001) and by the radiologists group (0.301; 95%CI: 0.488­0.113; p < 0.002). The lowest coefficient was found among the intensivists (0.248; 95%CI: 0.415­0.081; p » 0.004). Conclusion The proposed scale showed good reliability among neurosurgeons, and moderate overall reliability. This tomographic classification might be useful to better assist severe TBI victims, allowing to identify the worsening or amelioration of brain swelling, which should be further investigated. The scale seems to be feasible, even in low income countries,where the costof intracranial pressure (ICP)monitoring is higher than thatofCTs.

Reversible vasoconstriction syndrome Study and management proposal / Síndrome de vasoconstricción reversible Propuesta de estudio y manejo

Abstract Reversible vasoconstriction syndrome is a group of clinical-radiological alterations that are characterized by severe sudden-onset headaches and reversible multifocal narrowing of the cerebral arteries. Most patients do not present with focal neurological deficit, although it can be seen in a small group, associated with cerebral edema, stroke or seizures. It is considered to be a benign process that causes disability and death in a minority of patients. The term 'reversible vasoconstriction syndrome' has been proposed to unify a variety of clinical syndromes which are similar, but have different etiologies, and have originated various eponyms. The apparently low frequency of reversible vasoconstriction syndrome and the way it presents make it a diagnostic challenge in the emergency room, and it may go unnoticed without an adequate medical history. A case probably related to the use of isometeptene is presented. (Acta Med Colomb 2019; 44. DOI: https://doi.org/10.36104/amc.2019.1213)

Resumen El síndrome de vasoconstricción reversible es un grupo de alteraciones clínico-radiológicas que se caracterizan por cefaleas intensas de inicio brusco y estrechamiento multifocal reversible de las arterias cerebrales. La mayoría de los pacientes no presentan déficit neurológico focal, aunque puede verse en un grupo reducido asociándose con edema cerebral, ataque cerebrovascular o convulsiones. Es considerado un proceso benigno, en pocos casos originan discapacidad y muerte en una minoría de pacientes. El término de síndrome de vasoconstricción reversible se ha propuesto para unificar a una variedad de síndromes clínicos similares, pero de etiología diferentes y han originados diversos epónimos. La aparente baja frecuencia del síndrome de vasoconstricción reversible y su forma de presentación hace que se convierta en un reto diagnóstico en los servicios de urgencias y puede pasar desapercibido si no se tiene una historia clínica adecuada. Presentamos un caso probablemente relacionado al uso de isometepteno. (Acta Med Colomb 2019; 44. DOI:https://doi.org/10.36104/amc.2019.1213)

Craniectomía descompresiva, una alternativa de tratamiento. Caso clínico / Decompressive craniectomy, an alternative treatment. Clinical case

Introducción: El Trauma Cráneo Encefálico Grave (TCE), continúa siendo un problema de preocupación para las autoridades sanitarias a nivel mundial. A pesar de las diferentes publicaciones existen divergencias en la toma de desición en aplicar la Craniectomía descompresiva (Cd). En el presente trabajo se describe caso clínico portador de Hematoma Epidural (HE), Hipertensión Endocraneana (HE), intervenido quirúrgicamente donde la información fue tomada de la historia clínica realizada en la Unidad de Cuidados Intensivos del Hospital Andino del Chimborazo, Riobamba, Ecuador, previa obtención del consentimiento informado. Presentación del caso: Paciente femenina de 18 años de edad que sufre Trauma craneoencefálico grave, hematoma epidural con efecto de masa y edema cerebral. Sometida a craniectomía descompresiva y tratamiento neurointensivo. Estadía en Unidad de Cuidados Intensivos de seis días, evolución favorable, ausencia de secuelas neurológicas. Conclusiones: La Craniectomía descompresiva mejora la Hipertensión endocraneana, disminuye la estadía UCI, y los días de ventilación mecánica, sin embargo los estudios actuales demuestran que esta intervención no mejora resultados finales. La Craniectomía Descompresiva primaria, en centros de escasos recursos de neuromonitoreo, puede constituir un proceder salvador. La craniectomía descompresiva está indicada en la segunda línea de tratamiento según la American Association of Neurological Surgeons.

Introduction: Serious Skull Trauma (SST), continues to be a problem of concern for health authorities worldwide. Despite the different publications there are divergences in the decision making in applying decompressive craniectomy (dc). In the present work, a clinical case of Epidural Hematoma (EH), Endocranial Hypertension (EH), surgically intervened was described, where the information was taken from the clinical history carried out in the Intensive Care Unit of the Andino del Chimborazo Hospital, Riobamba, Ecuador, after obtaining the informed consent. Presentation of the case: An 18-year-old female patient suffering from severe head trauma, epidural hematoma with mass effect and cerebral edema. Subjected to decompressive craniectomy and neurointensive treatment. Stay in the Intensive Care Unit for six days, favorable evolution, absence of neurological sequelae. Conclusions: Decompressive craniectomy improves intracranial hypertension, decreases ICU stay, and days of mechanical ventilation, however current studies show that this intervention does not improve final results. Primary Decompressive Craniectomy, in centers with scarce resources of neuromonitoring, can be a saving procedure. Decompressive craniectomy is indicated in the second line of treatment according to the American Association of Neurological Surgeons.

Síndrome da encefalopatia posterior reversível: uma patologia pouco descrita no idoso / Posterior reversible encephalopathy syndrome: a disease rarely described in older adults

A síndrome da encefalopatia posterior reversível, conhecida como PRES, é rara e pouco descrita em idosos e é caracterizada pelo início subagudo de um conjunto de sinais clínicos e radiológicos e uma variedade de sintomas neurológicos, como cefaleia, crises convulsivas e transtornos da cognição. Na grande maioria dos pacientes, a apresentação clínica inclui pressão arterial elevada e emergência hipertensiva. A ressonância magnética (RM) é o exame padrão-ouro para o diagnóstico imaginológico dessa entidade. O quadro clínico e as alterações de imagens podem se tornar reversíveis caso seja detectada precocemente e tratada a causa base da síndrome. Os autores apresentam o caso clínico de uma idosa de 87 anos, internada para tratamento de pneumonia comunitária retornando ao setor de emergência 24 horas após a alta hospitalar apresentando sintomas neurológicos visuais complexos. Ao exame de RM, observaram-se lesões de hipodensidades occipitais bilaterais, sugestivas de edema vasogênico, compatível com PRES. Após o rigoroso controle da pressão arterial, verificou-se a reversibilidade total dessas lesões cerebrais.

Posterior reversible encephalopathy syndrome (PRES) is a disease rarely described in older adults. It is characterized by subacute onset of a set of clinical and radiological signs and a variety of neurological symptoms, such as headaches, seizures, and cognitive disorders. In the vast majority of patients, clinical presentation includes high blood pressure and hypertensive emergency. Magnetic resonance imaging (MRI) is the gold standard for diagnosing this condition using imaging findings. When the underlying cause is promptly recognized and treated, symptoms and imaging abnormalities may be completely reversible. The authors report the clinical case of an 87-year-old woman first admitted for treatment of community-acquired pneumonia. She returned to the emergency department 24 hours after discharge presenting with complex visual and neurological symptoms. An MRI scan showed lesions of bilateral occipital hypodensities, suggestive of vasogenic edema and compatible with PRES. Complete regression of brain lesions was observed after tight control of hypertension.

Encefalomielitis aguda diseminada viral / Acute disseminated viral encephalomyelitis

La encefalomielitis aguda diseminada (EMAD) es un trastorno neurológico caracterizado por inflamación del cerebro y médula espinal causada por un daño a la mielina, afectando al sistema nervioso central de manera difusa. Esta afección puede manifestarse de manera espontánea o secundaria a infecciones o a vacunación. La mayoría de las veces evoluciona de manera monofásica con manifestaciones clínicas inespecíficas, por lo que la sospecha diagnóstica es fundamental. La EMAD es la causa más frecuente de afectación de sustancia blanca. La incidencia es mayor en la edad prepuberal con una incidencia de aproximadamente 0,2-0,4 casos/100000 habitantes año. Tiene predominio estacional, siendo más frecuente en los meses de invierno y primavera. Afecta más a varones. A continuación presentaremos nuestra experiencia con un caso sin diagnóstico previo de esta excepcional y poco frecuente patología el cual se convirtió en un reto diagnóstico(AU)

Acute disseminated encephalomyelitis ADEM is a neurological disorder characterized by inflammation of the brain and spinal cord caused by damage to the myelin, affecting diffusely the central nervous system. This condition can appear spontaneously or secondary to infections or vaccination. Most of the time it evolves in a monophasic manner with nonspecific clinical manifestations, so that he diagnostic suspicion is fundamental. ADEM is the most frequent cause of white matter involvement. The incidence is higher in the prepubertal age with an incidence of approximately 0.2-0.4 cases / 100,000 inhabitants per year. It has a seasonal predominance, being more frequent in the winter and spring months. It affects more males. Below we present our experience with a case without previous diagnosis of this rare pathology which became a diagnostic challenge(AU)

Cerebral hemodynamic and metabolic changes in fulminant hepatic failure / Modificações da hemodinâmica e metabolismo cerebral na insuficiência hepatica fulminante

ABSTRACT Intracranial hypertension and brain swelling are a major cause of morbidity and mortality of patients suffering from fulminant hepatic failure (FHF). The pathogenesis of these complications has been investigated in man, in experimental models and in isolated cell systems. Currently, the mechanism underlying cerebral edema and intracranial hypertension in the presence of FHF is multi-factorial in etiology and only partially understood. The aim of this paper is to review the pathophysiology of cerebral hemodynamic and metabolism changes in FHF in order to improve understanding of intracranial dynamics complication in FHF.

RESUMO O edema cerebral e a hipertensão intracraniana (HIC) são as principais causas de morbidade e mortalidade de pacientes com insuficiência hepática fulminante (IHF). A patogênese dessas complicações tem sido investigada no homem, em modelos experimentais e em sistemas celulares isolados. Atualmente, o mecanismo subjacente ao edema cerebral e HIC na presença de IHF é multifatorial em etiologia e pouco compreendido na literatura. O objetivo deste trabalho é revisar a fisiopatologia das alterações hemodinâmicas e metabólicas cerebrais na IHF, visando melhorar a compreensão da complicação da hemodinâmica encefálica na IHF.

Síndrome de encefalopatía posterior reversible: reporte de un caso fatal y análisis de factores predictores de mal pronóstico / Posterior reversible encephalopathy syndrome: Report of a fatal case and analysis of predictive factors of a poor prognosis

El síndrome de encefalopatía posterior reversible es una condición que responde a múltiples causas y presenta características clínicas o radiológicas distintivas; los intensivistas y los médicos de urgencias deben conocerlo con el fin de hacer el diagnóstico y ordenar el tratamiento oportuno. Se presenta un caso fatal de síndrome de encefalopatía posterior reversible, en el cual se determinaron los factores de riesgo relacionados con el resultado final. Un hombre de 60 años sin antecedentes médicos ingresó por urgencias con depresión de la conciencia, convulsiones y tensión arterial elevada. Las imágenes de la tomografía revelaron un hematoma cerebeloso posterior, y las de resonancia magnética mostraron zonas isquémicas, edema vasogénico que se extendía desde los tálamos hacia el tallo cerebral, los pedúnculos cerebelosos medios y la sustancia blanca profunda de los hemisferios cerebelosos, así como zonas de transformación hemorrágica. A pesar del tratamiento médico y quirúrgico recibido, el paciente falleció. Se determinaron los factores de riesgo que se han descrito como causa de muerte en este síndrome. Este caso demuestra que dicho síndrome puede ocurrir sin que se hayan detectado factores de riesgo desencadenantes y pone en evidencia la necesidad de su reconocimiento temprano para establecer una intervención adecuada y evitar daños o un desenlace fatal. Además, abre el camino a nuevos estudios sobre la propensión a desarrollarlo y las medidas preventivas que pueden adoptarse.

Posterior reversible encephalopathy syndrome is an illness with multiple causes and distinctive clinicalradiological characteristics that should be known by intensivists and emergency room physicians for a timely diagnosis and treatment. A fatal case of posterior reversible encephalopathy syndrome is presented, and the risk factors related to the outcome are identified. A 60-year-old man without a relevant medical history arrived at the emergency room presenting with depressed consciousness, seizures, and high blood pressure. Tomographic images revealed a posterior cerebellar hematoma. Resonance images showed ischemic zones, vasogenic edema from the thalamus to the brain stem, middle cerebellar peduncles, deep white matter of the cerebral hemispheres, and zones of hemorrhagic transformation. Despite medical-surgical management, the patient died. The risk factors described as the cause of the fatal outcome were identified. This case demonstrates that posterior reversible encephalopathy syndrome can occur without triggering risk factors and highlights the need for early recognition to establish an appropriate intervention to avoid injury or a fatal outcome. Cases of posterior reversible encephalopathy syndrome provide opportunities to investigate the susceptibility for the development of this condition and to establish appropriate preventive measures.

Neurological complications and death in children with dengue virus infection: report of two cases

Background Dengue virus infection can have different complications; the best known is hemorrhagic dengue fever. However, other effects such as neurological disorders may endanger the lives of patients. Dengue neurological manifestations can be confused with encephalitis symptoms and can lead to cerebral edema and death. Therefore, we consider important in the endemic areas to take into account the diagnosis of dengue encephalitis in patients with neurological disorders, and to request the determination of serology in cerebrospinal fluid for the NS1 antigen test. Case presentation We present the cases of two patients from the state of Morelos, Mexico, with 17 and 14 years of age. Both cases presented a rapid evolution characterized by fever, seizures and neurological deterioration secondary to severe cerebral edema that evolved to cerebral death in both cases. The diagnosis of brain death was confirmed by electroencephalogram in both patients. The two patients were submitted to serology for NS1 that tested positive in both cases. They died between the second and fifth day after admission. Conclusions Retrospective studies have found that up to 4% of the patients have dengue virus infections, which leads us to believe that in endemic areas, this infection should be suspected in cases of encephalic and febrile symptoms. RT-PCR should be performed to identify cases of encephalitis caused by the dengue virus, and early interventions should be performed to attempt to reduce the morbidity and mortality of these cases.(AU)

Validación de la Escala de Predicción de Lesiones Intracraneales Eplic para Trauma Cráneo-Encefálico en Niños de 0 A 5 Años del Hospital Vicente Corral Moscoso Enero-Diciembre 2014. Estudio de Test Diagnóstico / Validation of the Eplic Intracranial Injury Prediction Scale for Cranio-Encephalic Trauma in Children 0-5 Years of Vicente Corral Moscoso Hospital January-December 2014. Diagnostic Test Study

OBJETIVO: Determinar la validez de una escala de pre-dicción de lesiones intracraneales para trauma encéfa-lo-craneal (TEC) en niños de 0 a 5 años en emergencia pediátrica del Hospital Vicente Corral Moscoso, 2014. METODOLOGÍA: Se realizó un estudio de validación de test diagnóstico, la muestra se calculó con las restric-ciones muestrales: sensibilidad: 80%, especificidad: 80%, alfa: 5%, prevalencia esperada: 10%, 7% de pérdidas quedando 409. Se incluyeron todos los niños de 0 a 5 años con trauma craneal con un representante que aceptó participar mediante consentimiento informa-do, se excluyeron abandonos del servicio e imposibili-dad de realizar tomografía de cráneo (TAC). La escala a validarse EPLIC fue diseñada por el autor y sometida a validación de constructo teórico. En todos los casos se llenó la escala y se realizó TAC como "gold standard" para identificar lesiones intracraneales analizada de forma ciega. La información se procesó en SPSS y se obtuvo: sensibilidad, especificidad, VP+, VP-, LR+ y LR-. RESULTADOS: 41 pacientes presentaron lesión intracraneal (10%), la lesión más frecuente fue edema cerebral (56%). El parámetro con mayor sensibilidad fue: caída de altura (95.1%), la mayor especificidad: presencia de >2 convulsiones (100%). Un puntaje total de 4 o más ob-tuvo la mejor sensibilidad combinada con mejor espe-cificidad (97.6% y 78.26%). El AUC para dicho puntaje fue de 0.908. CONCLUSIONES: La escala EPLIC resulta válida para predicción de lesiones intracraneales y por tanto puede ser una herramienta útil para manejo TEC en meno-res de 5 años.

OBJECTIVE: To determine the validity of a scale predic-tion of intracranial lesions to brain-cranial trauma in chil-dren aged from 0 to 5 years in pediatric emergency in The Vicente Corral Moscoso Hospital, 2014. METHODOLOGY: A validation study with a diagnostic test was performed, the sample was calculated with the sample restrictions: sensitivity 80%, specificity 80%, alpha: 5% expected prevalence: 10%, and 7% losses being 409. All children aged from 0 to 5 years with cranial trauma with a representative who agreed to participate by in-formed consent were included, the abandonment of service and inability to perform CAT skull were excluded. The validated scale ICPS was designed by the author and subjected to validation of theoretical construct. In all cases the scale was filled and CAT was performed as "gold standard" for identifying intracranial lesions analyzed blindly. The information was processed in SPSS and was obtained: sensitivity, specificity, PV +, PV, RL + and RL. RESULTS: A total of 41 patients had intracranial lesions (10%), the most frequent lesion was cerebral edema (56%). The most sensitive parameter was: drop height (95.1%), the highest specificity: the presence of> 2 seizu-res (100%). A total score of 4 or more obtained the best sensitivity combined with better specificity (97.6% and 78.26%). The UCA for that score was 0.908. CONCLUSIONS: The EPLIC scale is valid for predicting in-tracranial lesions and therefore it can be a useful tool for handling CBT under 5 years.

Característica clínico-epidemiológica de los pacientes pediátricos con cetoacidosis diabética / Clinical and epidemiological characteristics of pediatric patients with diabetic ketoacidosis

Antecedentes: La Cetoacidosis diabética (CAD) es una complicación de la Diabetes Mellitus, cuya importancia va cada vez en aumento. Es el trastorno metabólico que causa más ingresos a las unidades de cuidado inten- sivo pediátrico con una tasa de hospitalización que se ha mantenido alrededor de 10 por 100.000 niños/año. Objetivo: Describir las características clínico-epidemiológicas de la cetoacidosis diabética en los pacientes meno- res de 18 años. Pacientes y métodos: Se reali- zó un estudio descriptivo. La información fue recopilada mediante encuesta sobre caracte- rísticas socio-demográficas, epidemiológicas y diagnóstica en niños con CAD que fueron ingresados en la emergencia de pediatría del Hospital Nacional Dr. Mario Catarino Rivas (HNMCR), durante el período de agosto 2013 a agosto del 2015 (n=30). Resultados: Se en- contró 18 (60%) mujeres y 12 (40%) varones con CAD. El promedio de edad de los pacientes diagnosticados con CAD fue de 12 años, con una mediana de 13 años. El 50% de los pacien- tes con CAD eran debutantes y el 20% tenían 2 años de diagnóstico. Las infecciones de tracto urinario estuvieron presentes en el 40% de los casos. El promedio de glicemia sérica en los pacientes con CAD fue de 500 mg/dl. El edema cerebral fue la principal complicación encontrada en un 33.3% de los casos. Fallecie- ron el 7% de los pacientes con CAD. Conclusio- nes: La CAD es frecuente en mujeres adoles- centes y es desencadenado principalmente por infecciones del tracto urinario...(AU)

Effect of volume replacement during combined experimental hemorrhagic shock and traumatic brain injury in prostanoids, brain pathology and pupil status / Efeito da reposição volêmica durante o choque hemorrágico combinado com traumatismo craniencefálico sobre prostanóides, patologia cerebral e status pupilar

Traumatic brain injury (TBI) is the main cause of trauma-related deaths. Systemic hypotension and intracranial hypertension causes cerebral ischemia by altering metabolism of prostanoids. We describe prostanoid, pupilar and pathological response during resuscitation with hypertonic saline solution (HSS) in TBI. Method Fifteen dogs were randomized in three groups according to resuscitation after TBI (control group; lactated Ringer’s (LR) group and HSS group), with measurement of thromboxane, prostaglandin, macroscopic and microscopic pathological evaluation and pupil evaluation.Result Concentration of prostaglandin is greater in the cerebral venous blood than in plasma and the opposite happens with concentration of thromboxane. Pathology revealed edema in groups with the exception of group treated with HSS.Discussion and conclusion There is a balance between the concentrations of prostaglandin and thromboxane. HSS prevented the formation of cerebral edema macroscopically detectable. Pupillary reversal occurred earlier in HSS group than in LR group.

O traumatismo cranioencefálico (TCE) é a principal causa de morte relacionada ao trauma. O choque hemorrágico e hipertensão intracraniana causam isquemia cerebral alterando o metabolismo de prostanóides. Neste estudo, relatamos o comportamento dos prostanóides, resposta pupilar e patologia durante a reposição volêmica com solução salina hipertônica (SSH) no TCE. Método Quinze cachorros foram randomizados em três grupos (controle, grupo de Ringer lactato e grupo de SSH) e foram avaliados tromboxane, prostaglandina, avaliação patológica macroscópica e microscópica e status pupilar.Resultado A concentração de prostaglandina é maior no sangue cerebral em comparação ao plasma, e o inverso ocorre com o tromboxane. A patologia revelou edema em todos os grupos, com exceção do grupo tratado com SSH.Discussão e conclusão Existe um equilíbrio entre concentrações cerebrais e plasmáticas de prostaglandina e tromboxane. A SSH protegeu o cérebro da formação de edema pós traumático.

Hipotermia terapêutica como ponte até transplante em pacientes com falência hepática fulminante / Therapeutic hypothermia as a bridge to transplantation in patients with fulminant hepatic failure

Os tópicos mais importantes na falência hepática fulminante são o edema cerebral e a hipertensão intracraniana. Dentre todas as opções terapêuticas, tem sido relatado que a hipotermia sistêmica induzida em níveis entre 33 - 34ºC reduz a elevação da pressão e aumenta o tempo durante o qual os pacientes podem tolerar um enxerto. Esta revisão discutiu as indicações e os efeitos adversos da hipotermia.

The most important topics in fulminant hepatic failure are cerebral edema and intracranial hypertension. Among all therapeutic options, systemic induced hypothermia to 33 - 34ºC has been reported to reduce the high pressure and increase the time during which patients can tolerate a graft. This review discusses the indications and adverse effects of hypothermia.