20 results on '"Urriza J"'
Search Results
2. New methods for redistributing slack time in real-time systems: applications and comparative evaluations
- Author
-
Santos, R.M., Urriza, J., Santos, J., and Orozco, J.
- Subjects
Real-time system ,Scheduling (Management) -- Methods ,Real-time systems -- Analysis ,Real-time control -- Analysis - Published
- 2004
3. Parálisis facial bilateral secundaria a infección por virus de Epstein-Barr
- Author
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Erro, M.E., Urriza, J., Gila, L., Orbara, E., and Gurtubay, I. G. de
- Subjects
Facial diplegia ,Reflejo de parpadeo ,Diplejia facial ,Blink reflex ,Infectious mononucleosis ,Mononucleosis infecciosa - Abstract
Nuestro objetivo es describir dos pacientes jóvenes con parálisis facial periférica bilateral. Ambos presentaron inicialmente afectación en un lado de la cara, seguida pocos días después de afectación contralateral junto con sintomatología compatible con infección aguda por el virus de Epstein-Barr, que se confirmó con la serología. Uno de los pacientes experimentó mejoría completa mientras que en el otro la recuperación fue lenta y quedaron secuelas permanentes. La lesión bilateral del nervio facial es una complicación infrecuente de la infección por el virus de Epstein-Barr cuya evolución no siempre es favorable. Se discute su mecanismo patogénico. Two young patients with bilateral facial palsy are described. They initially presented unilateral facial palsy, followed by contralateral facial nerve involvement a few days later, together with clinical and serologic evidence of acute Epstein-Barr virus infection. The outcome was favourable in one patient but severe sequels persisted in the second. These two cases show that this infrequent complication of Epstein-Barr virus infection may not always have a good outcome. The pathogenic mechanism of bilateral facial palsy is discussed.
- Published
- 2010
4. [Pseudo-conduction block in nonsystemic vasculitic neuropathy]
- Author
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Rm, Pabón Meneses, Gila L, Urriza J, Imirizaldu L, Arrechea M, and Francisco LACRUZ
- Subjects
Adult ,Vasculitis ,Electromyography ,Humans ,Peripheral Nervous System Diseases ,Female - Abstract
Introduction. Nonsystemic vasculitic neuropathy (NSVN) is an inflammatory disorder of the vasa nervorum which usually is expressed as a mononeuritis multiplex. We present a patient with NSVN with histological confirmination focused on the neurophysiological findings at the early stages.A 36 years-old woman presented with paresthesia and weakness in her right hand followed by left footdrop. The first neurophysiologic examination showed low amplitude of the right median nerve (RMN) CMAP with proximal stimulation. A second examination showed signs of axonal damage in several nerves, including the RMN.The acute ischemic damage of a nerve can give a pattern of conduction block in the electroneurographic study as in the RMN of the presented case. This phenomenon is referred as "pseudo-conduction block", since it is transient and evolves towards a definite pattern of axonal neuropathy. When a vasculitic neuropathy is suspected, repeated neurophysiologic studies are necessary in order to ensure a proper (appropriate) characterization of the lesional patterns.
- Published
- 2009
5. Pseudobloqueo de conducción en vasculitis aislada del sistema nervioso periférico
- Author
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Pabón, R.M., Gila, L., Urriza, J., Imirizaldu, L., Arrechea, M., and Lacruz, F.
- Subjects
Vasculitis ,Mononeuropatía múltiple ,Mononeuritis multiplex ,Electromyography ,Degeneración walleriana ,Sural nerve biopsy ,Wallerian degeneration ,Electromiografía ,Biopsia de nervio sural - Abstract
Fundamento. La vasculitis aislada del sistema nervioso periférico (VASNP) afecta selectivamente a los vasa nervorum, expresándose generalmente como una mononeuropatía múltiple. Presentamos un caso de VASNP confirmado histológicamente, destacando los hallazgos neurofisiológicos en fase aguda. Observación clínica. Mujer de 36 años con parestesias y debilidad en mano derecha seguidas de paresia para la dorsiflexión del pie izquierdo. El primer estudio neurofisiológico mostraba amplitud reducida del potencial motor del mediano derecho con estímulos proximales. Un segundo estudio mostraba signos de lesión axonal en varios nervios, incluyendo el mediano derecho. Conclusiones. La lesión isquémica aguda de un nervio puede dar lugar a un patrón electroneurográfico de bloqueo de conducción, como en el mediano derecho del caso descrito. Este fenómeno es conocido como "pseudobloqueo", dado su carácter transitorio, con evolución a un patrón de neuropatía axonal. La sospecha de VASNP requiere estudios neurofisiológicos seriados para una correcta tipificación de los patrones lesionales. Introduction. Nonsystemic vasculitic neuropathy (NSVN) is an inflammatory disorder of the vasa nervorum which usually is expressed as a mononeuritis multiplex. We present a patient with NSVN with histological confirmination focused on the neurophysiological findings at the early stages. Case report. A 36 years-old woman presented with paresthesia and weakness in her right hand followed by left footdrop. The first neurophysiologic examination showed low amplitude of the right median nerve (RMN) CMAP with proximal stimulation. A second examination showed signs of axonal damage in several nerves, including the RMN. Conclusions. The acute ischemic damage of a nerve can give a pattern of conduction block in the electroneurographic study as in the RMN of the presented case. This phenomenon is referred as "pseudo-conduction block", since it is transient and evolves towards a definite pattern of axonal neuropathy. When a vasculitic neuropathy is suspected, repeated neurophysiologic studies are necessary in order to ensure a proper (appropriate) characterization of the lesional patterns.
- Published
- 2009
6. Monitorización neurofisiológica intraoperatoria: métodos en neurocirugía
- Author
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Urriza, J., Imirizaldu, L., Pabón, R.M., Olaziregi, O., and García de Gurtubay, I.
- Subjects
Monitorización neurofisiológica intraoperatoria ,Monitoring techniques ,Intraoperative neurophysiological monitoring ,Técnicas de monitorización - Abstract
La monitorización neurofisiológica intraoperatoria (MIO) utiliza las distintas técnicas neurofisiológicas en el quirófano para monitorizar la función nerviosa durante la cirugía, evitando posibles lesiones neurológicas, con lo que disminuye la morbilidad y mejora el manejo quirúrgico, permitiendo cirugías más agresivas y mejorando las estrategias quirúrgicas. Existen dos tipos de técnicas en la monitorización neurofisiológica, las de mapeo -que identifican las estructuras en riesgo- y las de monitorización propiamente dichas -que proveen un feed-back continuo de la función- así como sus complicaciones, que aunque infrecuentes, existen. Se exponen las técnicas quirúrgicas que se pueden utilizar en la monitorización así como una posible guia orientativa sobre su uso según la zona quirúrgica y las estructuras en riesgo. La MIO constituye uno de los avances más importantes que ha tenido lugar en la neurocirugía moderna. IONM uses different neurophysiological techniques during surgery time, thus avoiding possible lesions to the neurological structures, making surgery safer and better. We describe two types of IONM: mapping techniques and monitoring techniques, as well as their advantages, disadvantages and complications. We look into the more useful techniques in this field, as well as providing orientation about its use according to the surgical areas and the neurological structures under risk. In conclusion, we affirm that IONM is one of the most important advances in modern neurosurgery.
- Published
- 2009
7. Monitorización neurofisiológica intraoperatoria en cirugía de columna
- Author
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Imirizaldu, L., Urriza, J., Olaziregi, O., Hidalgo, A., and Pabón, R.M.
- Subjects
Monitorización neurofisiológica intraoperatoria ,Cirugía del raquis ,Potenciales evocados motores ,Spine surgery ,Neurophysiological intraoperative monitoring ,Transcranial stimulation ,Estimulación transcraneal ,Potenciales evocados somatosensoriales ,Motor evoked potentials ,Somatosensory evoked potentials - Abstract
La monitorización neurofisiológica intraoperatoria (MNIO) permite conocer el estado de las funciones neurológicas durante la cirugía, guiando al cirujano y minimizando los riesgos de lesión. En este trabajo se describen las diferentes técnicas neurofisiológicas disponibles para la MNIO en cirugía del raquis (potenciales evocados somatosensoriales, potenciales evocados motores, neurografía, electromiografía, reflejos y potenciales evocados dermatómicos), que se emplearán a criterio del neurofisiólogo según las estructuras nerviosas en riesgo. Para el éxito de la monitorización es indispensable la coordinación entre todos los profesionales del equipo. En el caso de que la MNIO muestre alteraciones, en primer lugar, el neurofisiólogo debe asegurar la integridad del sistema de registro. A continuación, el anestesista valorará la presión sanguínea, oxigenación, ventilación y hematocrito adecuados y revertirá los cambios recientes realizados en la anestesia. Por último, el cirujano, debería detener la intervención e intentar determinar la causa para revertirla en el caso de que fuera posible. Intraoperative neurophysiological monitoring (IONM) makes it possible to determine the status of neurological function during surgery. It guides the surgeon and minimises the risk of injury. This paper describes the different techniques available for IONM in spine surgery (somatosensory evoked potentials, motor evoked potentials, neurography, electromyography, reflexes and dermatomic evoked potentials), which neurophysiologists employ depending on the nerve structures at risk. In order for monitoring to be successful, coordination between all members of the surgical team is essential. In the event of IONM registering alterations, the neurophysiologist must first check the integrity of the recording system. The anaesthetist should then assess blood pressure, oxygen levels, ventilation and haematocrit values, and revert recent anaesthetic changes. Finally, the surgeon must stop the procedure and try to determine the cause of the event, and correct it if possible.
- Published
- 2009
8. Neurocisticercosis: Una enfermedad emergente
- Author
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Imirizaldu, L., Miranda, L., García-Gurtubay, I., Gastón, I., Urriza, J., and Quesada, P.
- Subjects
Neurocisticercosis ,Neurocysticerosis ,Taenia solium ,Inmigración ,Immigration ,Albendazole ,Albendazol ,Crisis - Abstract
La neurocisticercosis es una afectación del sistema nervioso central por las larvas de la Taenia solium. Aunque en nuestro país su diagnóstico era excepcional, en los últimos años se ha observado un notable incremento en el número de casos diagnosticados, debido al fenómeno de la inmigración desde países donde la enfermedad es endémica. La forma de presentación más frecuente de la neurocisticercosis es la crisis epiléptica, seguida de la cefalea. Para el diagnóstico de sospecha debemos valorar los datos epidemiológicos y la clínica y confirmarlo mediante los estudios de neuroimagen e inmunológicos. El tratamiento de elección debe ser farmacológico, principalmente con albendazol, y reservar la cirugía para los casos en el que el primero falla. Las medidas higiénico-sanitarias y el tratamiento de los pacientes con teniasis son de suma importancia. La neurocisticercosis ha dejado de ser uno de esos diagnósticos excepcionales y dado el previsible aumento de su incidencia en nuestro medio, los profesionales sanitarios debemos conocer dicha enfermedad e incluirla en niveles más altos de los algoritmos de diagnóstico diferencial. Neurocysticerosis is an affection of the central nervous system by the larvae of the Taenia solium. Although its diagnosis in our country is exceptional, in recent years a notable increase in the number of cases diagnosed has been observed, due to the phenomenon of immigration from countries where the disease is endemic. The most frequent form of presentation of neurocysticercosis is seizures, followed by headache. To diagnose it we must evaluate the epidemiological data, the clinical record and confirm this through neuroimage and immunological studies. The treatment selected should be pharmacological, principally with albendazole, and surgery reserved for cases where the former fails. Hygienic measures and the treatment of patients with teniasis are of great importance. Neurocysticerosis has ceased to be an exceptional diagnosis and given the foreseeable increase of its incidence in our milieu, health professionals must understand this disease and include it at higher levels of the algorithms of differential diagnosis.
- Published
- 2004
9. Narcolepsia: actualización en etiología, manifestaciones clínicas y tratamiento
- Author
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Pabón, R.M., primary, García de Gurtubay, I., additional, Morales, G., additional, Urriza, J., additional, Imirizaldu, L., additional, and Ramos-Argüelles, F., additional
- Published
- 2010
- Full Text
- View/download PDF
10. Parálisis facial bilateral secundaria a infección por virus de Epstein-Barr
- Author
-
Erro, M.E., primary, Urriza, J., additional, Gila, L., additional, Orbara, E., additional, and Gurtubay, I. G. de, additional
- Published
- 2010
- Full Text
- View/download PDF
11. Pseudobloqueo de conducción en vasculitis aislada del sistema nervioso periférico
- Author
-
Pabón, R.M., primary, Gila, L., additional, Urriza, J., additional, Imirizaldu, L., additional, Arrechea, M., additional, and Lacruz, F., additional
- Published
- 2009
- Full Text
- View/download PDF
12. Monitorización neurofisiológica intraoperatoria: métodos en neurocirugía
- Author
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Urriza, J., primary, Imirizaldu, L., additional, Pabón, R.M., additional, Olaziregi, O., additional, and García de Gurtubay, I., additional
- Published
- 2009
- Full Text
- View/download PDF
13. Monitorización neurofisiológica intraoperatoria en cirugía de columna
- Author
-
Imirizaldu, L., primary, Urriza, J., additional, Olaziregi, O., additional, Hidalgo, A., additional, and Pabón, R.M., additional
- Published
- 2009
- Full Text
- View/download PDF
14. Neurocisticercosis: Una enfermedad emergente
- Author
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Imirizaldu, L., primary, Miranda, L., additional, García-Gurtubay, I., additional, Gastón, I., additional, Urriza, J., additional, and Quesada, P., additional
- Published
- 2004
- Full Text
- View/download PDF
15. Early epigenetic changes of Alzheimer's disease in the human hippocampus.
- Author
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Blanco-Luquin I, Acha B, Urdánoz-Casado A, Sánchez-Ruiz De Gordoa J, Vicuña-Urriza J, Roldán M, Labarga A, Zelaya MV, Cabello C, Méndez-López I, and Mendioroz M
- Subjects
- Alzheimer Disease pathology, Aspartate Aminotransferase, Cytoplasmic genetics, Fatty Acid Elongases genetics, Hippocampus pathology, Histones genetics, Humans, tau Proteins genetics, tau Proteins metabolism, Alzheimer Disease genetics, DNA Methylation, Epigenesis, Genetic, Hippocampus metabolism
- Abstract
The discovery of new biomarkers would be very valuable to improve the detection of early Alzheimer's disease (AD). DNA methylation marks may serve as epigenetic biomarkers of early AD. Here we identified epigenetic marks that are present in the human hippocampus from the earliest stages of AD. A previous methylome dataset of the human AD hippocampus was used to select a set of eight differentially methylated positions (DMPs) since early AD stages. Next, bisulphite pyrosequencing was performed in an expanded homogeneous cohort of 18 pure controls and 35 hippocampal samples with neuropathological changes of pure AD. Correlation between DNA methylation levels in DMPs and phospho-tau protein burden assessed by immunohistochemistry in the hippocampus was also determined. We found four DMPs showing higher levels of DNA methylation at early AD stages compared to controls, involving ELOVL2, GIT1/TP53I13 and the histone gene locus at chromosome 6. DNA methylation levels assessed by bisulphite pyrosequencing correlated with phospho-tau protein burden for ELOVL2 and HIST1H3E/HIST1H3 F genes. In this discovery study, a set of four epigenetic marks of early AD stages have been identified in the human hippocampus. It would be worth studying in-depth the specific pathways related to these epigenetic marks. These early alterations in DNA methylation in the AD hippocampus could be regarded as candidate biomarkers to be explored in future translational studies., Abbreviations: AD: Alzheimer's disease; DMPs: Differentially methylated positions; CSF: Cerebrospinal fluid; βA42: β-amyloid 42; PET: positron emission tomography; 5mC: 5-methyl cytosine; CpG: cytosine-guanine dinucleotides; ANK1 : ankyrin-1; BIN1 : amphiphysin II; p-tau: hyperphosphorylated tau; CERAD: Consortium to Establish A Registry for Alzheimer's Disease; SD: standard deviation; ANOVA: one-way analysis of variance; VLCFAs: very long-chain fatty acids; DHA: docosahexaenoic acid; mTOR: mechanistic target of rapamycin.
- Published
- 2020
- Full Text
- View/download PDF
16. [Narcolepsy: update on etiology, clinical features and treatment].
- Author
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Pabón Meneses RM, García de Gurtubay I, Morales G, Urriza J, Imirizaldu L, and Ramos-Argüelles F
- Subjects
- Diagnosis, Differential, Humans, Narcolepsy diagnosis, Narcolepsy etiology, Narcolepsy therapy
- Abstract
Narcolepsy is a disease that involves an alteration in the generation and organisation of sleep. The main symptoms are excessive daytime sleepiness and cataplexy, followed by hypnagogic hallucinations, sleep paralysis and disrupted nocturnal sleep. The prevalence of typical narcolepsy oscillates between 25-50: 100.000 in general. Recently there has been a peak incidence in patients born in the month of March. According to the new classification, the Multiple Sleep Latency Test (MSLT) is mandatory for diagnosing narcolepsy without cataplexy, and advisable for diagnosing narcolepsy with cataplexy. Until now, the attempt has been made to control each symptom by its own specific treatment. At present, new American and European treatment guidelines propose new drugs that act on all the symptoms. The application of new criteria of diagnosis and treatment has improved the diagnosis, giving better options of treatment.
- Published
- 2010
17. [Pseudo-conduction block in nonsystemic vasculitic neuropathy].
- Author
-
Pabón Meneses RM, Gila L, Urriza J, Imirizaldu L, Arrechea M, and Lacruz F
- Subjects
- Adult, Electromyography, Female, Humans, Peripheral Nervous System Diseases physiopathology, Vasculitis physiopathology, Peripheral Nervous System Diseases complications, Vasculitis complications
- Abstract
Summary: Introduction. Nonsystemic vasculitic neuropathy (NSVN) is an inflammatory disorder of the vasa nervorum which usually is expressed as a mononeuritis multiplex. We present a patient with NSVN with histological confirmination focused on the neurophysiological findings at the early stages., Case Report: A 36 years-old woman presented with paresthesia and weakness in her right hand followed by left footdrop. The first neurophysiologic examination showed low amplitude of the right median nerve (RMN) CMAP with proximal stimulation. A second examination showed signs of axonal damage in several nerves, including the RMN., Conclusions: The acute ischemic damage of a nerve can give a pattern of conduction block in the electroneurographic study as in the RMN of the presented case. This phenomenon is referred as "pseudo-conduction block", since it is transient and evolves towards a definite pattern of axonal neuropathy. When a vasculitic neuropathy is suspected, repeated neurophysiologic studies are necessary in order to ensure a proper (appropriate) characterization of the lesional patterns.
- Published
- 2009
- Full Text
- View/download PDF
18. [Intraoperative neurophysiological monitoring in spine surgery].
- Author
-
Imirizaldu L, Urriza J, Olaziregui O, Hidalgo A, and Pabón RM
- Subjects
- Electromyography, Evoked Potentials, Humans, Patient Care Team, Monitoring, Intraoperative methods, Nervous System Physiological Phenomena, Neurosurgical Procedures methods, Spine surgery
- Abstract
Intraoperative neurophysiological monitoring (IONM) makes it possible to determine the status of neurological function during surgery. It guides the surgeon and minimises the risk of injury. This paper describes the different techniques available for IONM in spine surgery (somatosensory evoked potentials, motor evoked potentials, neurography, electromyography, reflexes and dermatomic evoked potentials), which neurophysiologists employ depending on the nerve structures at risk. In order for monitoring to be successful, coordination between all members of the surgical team is essential. In the event of IONM registering alterations, the neurophysiologist must first check the integrity of the recording system. The anaesthetist should then assess blood pressure, oxygen levels, ventilation and haematocrit values, and revert recent anaesthetic changes. Finally, the surgeon must stop the procedure and try to determine the cause of the event, and correct it if possible.
- Published
- 2009
- Full Text
- View/download PDF
19. [Intraoperative neurophysiological monitoring: methods in neurosurgery].
- Author
-
Urriza J, Imirizaldu L, Pabón RM, Olaziregui O, and de Gurtubay IG
- Subjects
- Brain Mapping methods, Evoked Potentials, Motor, Humans, Monitoring, Intraoperative methods, Nervous System Physiological Phenomena, Neurosurgical Procedures methods
- Abstract
IONM uses different neurophysiological techniques during surgery time, thus avoiding possible lesions to the neurological structures, making surgery safer and better. We describe two types of IONM: mapping techniques and monitoring techniques, as well as their advantages, disadvantages and complications. We look into the more useful techniques in this field, as well as providing orientation about its use according to the surgical areas and the neurological structures under risk. In conclusion, we affirm that IONM is one of the most important advances in modern neurosurgery.
- Published
- 2009
- Full Text
- View/download PDF
20. [Neurocysticercosis. An emergent disease].
- Author
-
Imirizaldu L, Miranda L, García-Gurtubay I, Gastón I, Urriza J, and Quesada P
- Subjects
- Diagnosis, Differential, Humans, Prognosis, Neurocysticercosis diagnosis, Neurocysticercosis epidemiology, Neurocysticercosis parasitology, Neurocysticercosis therapy
- Abstract
Neurocysticerosis is an affection of the central nervous system by the larvae of the Taenia solium. Although its diagnosis in our country is exceptional, in recent years a notable increase in the number of cases diagnosed has been observed, due to the phenomenon of immigration from countries where the disease is endemic. The most frequent form of presentation of neurocysticercosis is seizures, followed by headache. To diagnose it we must evaluate the epidemiological data, the clinical record and confirm this through neuroimage and immunological studies. The treatment selected should be pharmacological, principally with albendazole, and surgery reserved for cases where the former fails. Hygienic measures and the treatment of patients with teniasis are of great importance. Neurocysticerosis has ceased to be an exceptional diagnosis and given the foreseeable increase of its incidence in our milieu, health professionals must understand this disease and include it at higher levels of the algorithms of differential diagnosis.
- Published
- 2004
- Full Text
- View/download PDF
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