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1.
J Alzheimers Dis ; 83(4): 1513-1519, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34420956

RESUMEN

BACKGROUND: Photobiomodulation (PBM) affects local blood flow regulation through nitric oxide generation, and various studies have reported on its effect on improving cognitive function in neurodegenerative diseases. However, the effect of PBM in the areas of the vertebral arteries (VA) and internal carotid arteries (ICA), which are the major blood-supplying arteries to the brain, has not been previously investigated. OBJECTIVE: We aimed to determine whether irradiating PBM in the areas of the VA and ICA, which are the major blood-supplying arteries to the brain, improved regional cerebral blood flow (rCBF) and cognitive function. METHODS: Fourteen patients with mild cognitive impairments were treated with PBM. Cognitive assessment and single-photon emission computed tomography were implemented at the baseline and at the end of PBM. RESULTS: Regarding rCBF, statistically significant trends were found in the medial prefrontal cortex, lateral prefrontal cortex, anterior cingulate cortex, and occipital lateral cortex. Based on the cognitive assessments, statistically significant trends were found in overall cognitive function, memory, and frontal/executive function. CONCLUSION: We confirmed the possibility that PBM treatment in the VA and ICA areas could positively affect cognitive function by increasing rCBF. A study with a larger sample size is needed to validate the potential of PBM.


Asunto(s)
Encéfalo/efectos de la radiación , Circulación Cerebrovascular/efectos de la radiación , Cognición/efectos de la radiación , Disfunción Cognitiva/terapia , Terapia por Luz de Baja Intensidad , Anciano , Arteria Carótida Interna/efectos de la radiación , Función Ejecutiva/efectos de la radiación , Femenino , Humanos , Masculino , Memoria/efectos de la radiación , Persona de Mediana Edad , Pruebas Neuropsicológicas , Proyectos Piloto , Flujo Sanguíneo Regional , Tomografía Computarizada de Emisión de Fotón Único
2.
IEEE J Biomed Health Inform ; 24(6): 1772-1779, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-31714245

RESUMEN

Transcranial infrared laser stimulation (TILS) is a promising noninvasive intervention for neurological diseases. Though some experimental work has been done to understand the mechanism of TILS, the reported statistical analysis of data is quite simple and could not provide a comprehensive picture on the effect of TILS. This study learns the effect of TILS on hemodynamics of the human brain from experimental data using longitudinal data analysis methods. Specifically, repeated measures analysis of variance (ANOVA) is first applied to confirm the significance of the TILS effect and its characteristics. Based on that, two parametric mixed-effect models and non-parametric functional mixed-effect model are proposed to model the population-level performance and individual variation of this effect. Interpretations on the fitted models are provided, and comparison of the three proposed models in terms of fitting and prediction performance is made to select the best model. According to the selected model, TILS increases the concentration of oxygenated hemoglobin in the brain and this effect sustains even after the treatment stops. Also, there is considerable variation among individual responses to TILS.


Asunto(s)
Encéfalo/irrigación sanguínea , Hemodinámica , Terapia por Luz de Baja Intensidad , Circulación Cerebrovascular/fisiología , Circulación Cerebrovascular/efectos de la radiación , Hemodinámica/fisiología , Hemodinámica/efectos de la radiación , Humanos , Rayos Infrarrojos , Modelos Estadísticos , Oxihemoglobinas/análisis
3.
Photobiomodul Photomed Laser Surg ; 37(10): 657-666, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31647777

RESUMEN

Objective: This research evaluated the hemodynamic conditions before and after the transcranial photobiomodulation therapy (PBMT) and investigated neurocognitive changes before and after treatment. Background: Traumatic brain injury (TBI) is the major cause of morbidity and mortality among individuals 21-60 years old and causes ∼500,000 people to be hospitalized in Brazil annually. Some survivors develop an irreversible decrease in neurological function, and the mortality rate is as high as 70% in severe cases. PBMT is an alternative to treat secondary injuries due to TBI. Methods: This multidisciplinary clinical study was carried out on 10 chronic adult patients with severe TBI, who were treated with PBMT with an optical device containing 13 sets of 4 light emitting diodes, and underwent hemodynamic transcranial Doppler and neuropsychological evaluation at three different times: pre-PBMT, post-PBMT (after a week), and late-PBMT, which occurred 3 months after the last session. The patients received PBMTs three times a week, for 6 weeks. PBMTs were performed for 18 sessions for 6 weeks and 30 min per session. Results: The results found an alteration in the cerebral blood flow (CBF) as well as a consequent increase of the cerebral oxygenation that helped to improve the cerebral function. Conclusions: The PBMT contributed to increased CBF, evidenced mainly by the increased left peak systolic velocity, which consequently increased the hemodynamic response after the PBMT and impacts on the peripheral cerebral perfusion contributing to improved cerebral function.


Asunto(s)
Lesiones Traumáticas del Encéfalo/diagnóstico por imagen , Lesiones Traumáticas del Encéfalo/rehabilitación , Lesiones Traumáticas del Encéfalo/radioterapia , Circulación Cerebrovascular/efectos de la radiación , Terapia por Luz de Baja Intensidad/métodos , Adulto , Brasil , Circulación Cerebrovascular/fisiología , Enfermedad Crónica , Cognición/efectos de la radiación , Estudios de Cohortes , Evaluación de la Discapacidad , Femenino , Estudios de Seguimiento , Humanos , Puntaje de Gravedad del Traumatismo , Imagen por Resonancia Magnética/métodos , Masculino , Persona de Mediana Edad , Pruebas Neuropsicológicas , Estudios Retrospectivos , Factores de Tiempo , Resultado del Tratamiento , Ultrasonografía Doppler/métodos , Adulto Joven
4.
Biomolecules ; 9(10)2019 10 04.
Artículo en Inglés | MEDLINE | ID: mdl-31590236

RESUMEN

The neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) is commonly used to model Parkinson's disease (PD) as it specifically damages the nigrostriatal dopaminergic pathway. Recent studies in mice have, however, provided evidence that MPTP also compromises the integrity of the brain's vasculature. Photobiomodulation (PBM), the irradiation of tissue with low-intensity red light, mitigates MPTP-induced loss of dopaminergic neurons in the midbrain, but whether PBM also mitigates MPTP-induced damage to the cerebrovasculature has not been investigated. This study aimed to characterize the time course of cerebrovascular disruption following MPTP exposure and to determine whether PBM can mitigate this disruption. Young adult male C57BL/6 mice were injected with 80 mg/kg MPTP or isotonic saline and perfused with fluorescein isothiocyanate FITC-labelled albumin at various time points post-injection. By 7 days post-injection, there was substantial and significant leakage of FITC-labelled albumin into both the substantia nigra pars compacta (SNc; p < 0.0001) and the caudate-putamen complex (CPu; p ≤ 0.0003); this leakage partly subsided by 14 days post-injection. Mice that were injected with MPTP and treated with daily transcranial PBM (670 nm, 50 mW/cm2, 3 min/day), commencing 24 hours after MPTP injection, showed significantly less leakage of FITC-labelled albumin in both the SNc (p < 0.0001) and CPu (p = 0.0003) than sham-treated MPTP mice, with levels of leakage that were not significantly different from saline-injected controls. In summary, this study confirms that MPTP damages the brain's vasculature, delineates the time course of leakage induced by MPTP out to 14 days post-injection, and provides the first direct evidence that PBM can mitigate this leakage. These findings provide new understanding of the use of the MPTP mouse model as an experimental tool and highlight the potential of PBM as a therapeutic tool for reducing vascular dysfunction in neurological conditions.


Asunto(s)
1-Metil-4-fenil-1,2,3,6-Tetrahidropiridina/efectos adversos , Encéfalo/irrigación sanguínea , Terapia por Luz de Baja Intensidad/métodos , Enfermedad de Parkinson/radioterapia , Animales , Encéfalo/efectos de la radiación , Circulación Cerebrovascular/efectos de la radiación , Modelos Animales de Enfermedad , Fluoresceína-5-Isotiocianato/administración & dosificación , Fluoresceína-5-Isotiocianato/análogos & derivados , Fluoresceína-5-Isotiocianato/farmacología , Masculino , Ratones , Ratones Endogámicos C57BL , Enfermedad de Parkinson/etiología , Enfermedad de Parkinson/metabolismo , Distribución Aleatoria , Albúmina Sérica/administración & dosificación , Albúmina Sérica/farmacología
5.
Photobiomodul Photomed Laser Surg ; 37(2): 77-84, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31050928

RESUMEN

Objective: This study explored the outcome of applying red/near-infrared light therapy using light-emitting diodes (LEDs) pulsed with three different frequencies transcranially to treat traumatic brain injury (TBI) in Veterans. Background: Photobiomodulation therapy (PBMT) using LEDs has been shown to have positive effects on TBI in humans and animal models. Materials and methods: Twelve symptomatic military Veterans diagnosed with chronic TBI >18 months post-trauma received pulsed transcranial PBMT (tPBMT) using two neoprene therapy pads containing 220 infrared and 180 red LEDs, generating a power output of 3.3 W and an average power density of 6.4 mW/cm2 for 20 min, thrice per week over 6 weeks. Outcome measures included standardized neuropsychological test scores and qualitative and quantitative single photon emission computed tomography (SPECT) measures of regional cerebral blood flow (rCBF). Results: Pulsed tPBMT significantly improved neuropsychological scores in 6 of 15 subscales (40.0%; p < 0.05; two tailed). SPECT analysis showed increase in rCBF in 8 of 12 (66.7%) study participants. Quantitative SPECT analysis revealed a significant increase in rCBF in this subgroup of study participants and a significant difference between pre-treatment and post-treatment gamma ray counts per cubic centimeter [t = 3.77, df = 7, p = 0.007, 95% confidence interval (95,543.21-21,931.82)]. This is the first study to report quantitative SPECT analysis of rCBF in regions of interest following pulsed tPBMT with LEDs in TBI. Conclusions: Pulsed tPBMT using LEDs shows promise in improving cognitive function and rCBF several years after TBI. Larger, controlled studies are indicated.


Asunto(s)
Lesiones Traumáticas del Encéfalo/radioterapia , Lesión Encefálica Crónica/radioterapia , Circulación Cerebrovascular/efectos de la radiación , Cognición/efectos de la radiación , Terapia por Luz de Baja Intensidad , Veteranos , Adulto , Lesiones Traumáticas del Encéfalo/fisiopatología , Lesiones Traumáticas del Encéfalo/psicología , Lesión Encefálica Crónica/fisiopatología , Lesión Encefálica Crónica/psicología , Estudios de Cohortes , Humanos , Masculino , Persona de Mediana Edad , Pruebas Neuropsicológicas , Tomografía Computarizada de Emisión de Fotón Único , Resultado del Tratamiento , Adulto Joven
6.
Photobiomodul Photomed Laser Surg ; 37(3): 133-141, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31050950

RESUMEN

Objective: To examine the effects of transcranial and intranasal photobiomodulation (PBM) therapy, administered at home, in patients with dementia. Background: This study sought to replicate and build upon a previously published case series report describing improved cognitive function in five patients with mild-to-moderate dementia after 12 weeks of transcranial and intranasal near-infrared (NIR) PBM therapy. Materials and methods: Eight participants (mean age: 79.8 ± 5.8 years old) diagnosed with dementia by their physicians were randomized to 12 weeks of usual care (UC, n = 4) or home PBM treatments (n = 4). The NIR PBM treatments were administered by a study partner at home three times per week with the Vielight Neuro Gamma device. The participants were assessed with the Alzheimer's Disease Assessment Scale-cognitive (ADAS-cog) subscale and the Neuropsychiatric Inventory (NPI) at baseline and 6 and 12 weeks, and with arterial spin-labeled perfusion magnetic resonance imaging (MRI) and resting-state functional MRI at baseline and 12 weeks. Results: At baseline, the UC and PBM groups did not differ demographically or clinically. However, after 12 weeks, there were improvements in ADAS-cog (group × time interaction: F1,6 = 16.35, p = 0.007) and NPI (group × time interaction: F1,6 = 7.52, p = 0.03), increased cerebral perfusion (group × time interaction: F1,6 = 8.46, p < 0.03), and increased connectivity between the posterior cingulate cortex and lateral parietal nodes within the default-mode network in the PBM group. Conclusions: Because PBM was well tolerated and associated with no adverse side effects, these results support the potential of PBM therapy as a viable home treatment for individuals with dementia.


Asunto(s)
Circulación Cerebrovascular/efectos de la radiación , Cognición/efectos de la radiación , Demencia/terapia , Servicios de Atención de Salud a Domicilio , Terapia por Luz de Baja Intensidad , Anciano , Anciano de 80 o más Años , Circulación Cerebrovascular/fisiología , Cognición/fisiología , Demencia/fisiopatología , Demencia/psicología , Femenino , Giro del Cíngulo/irrigación sanguínea , Giro del Cíngulo/diagnóstico por imagen , Giro del Cíngulo/fisiopatología , Humanos , Imagen por Resonancia Magnética , Masculino , Proyectos Piloto , Resultado del Tratamiento
7.
Trials ; 19(1): 249, 2018 Apr 24.
Artículo en Inglés | MEDLINE | ID: mdl-29690927

RESUMEN

BACKGROUND: Photobiomodulation describes the use of red or near-infrared light to stimulate or regenerate tissue. It was discovered that near-infrared wavelengths (800-900 nm) and red (600 nm) light-emitting diodes (LED) are able to penetrate through the scalp and skull and have the potential to improve the subnormal cellular activity of compromised brain tissue. Different experimental and clinical studies were performed to test LED therapy for traumatic brain injury (TBI) with promising results. One of the proposals of this present study is to develop different approaches to maximize the positive effects of this therapy and improve the quality of life of TBI patients. METHODS/DESIGN: This is a double-blinded, randomized, controlled trial of patients with diffuse axonal injury (DAI) due to a severe TBI in an acute stage (less than 8 h). Thirty two patients will be randomized to active coil helmet and inactive coil (sham) groups in a 1:1 ratio. The protocol includes 18 sessions of transcranial LED stimulation (627 nm, 70 mW/cm2, 10 J/cm2) at four points of the frontal and parietal regions for 30 s each, totaling 120 s, three times per week for 6 weeks, lasting 30 min. Patients will be evaluated with the Glasgow Outcome Scale Extended (GOSE) before stimulation and 1, 3, and 6 months after the first stimulation. The study hypotheses are as follows: (1) transcranial LED therapy (TCLT) will improve the cognitive function of DAI patients and (2) TCLT will promote beneficial hemodynamic changes in cerebral circulation. DISCUSSION: This study evaluates early and delayed effects of TCLT on the cognitive rehabilitation for DAI following severe acute TBI. There is a paucity of studies regarding the use of this therapy for cognitive improvement in TBI. There are some experimental studies and case series presenting interesting results for TBI cognitive improvement but no clinical trials. TRIAL REGISTRATION: ClinicalTrials.gov, NCT03281759 . Registered on 13 September 2017.


Asunto(s)
Lesiones Traumáticas del Encéfalo/radioterapia , Encéfalo/efectos de la radiación , Cognición/efectos de la radiación , Lesión Axonal Difusa/radioterapia , Láseres de Semiconductores/uso terapéutico , Terapia por Luz de Baja Intensidad/instrumentación , Adolescente , Adulto , Encéfalo/irrigación sanguínea , Encéfalo/fisiopatología , Lesiones Traumáticas del Encéfalo/diagnóstico , Lesiones Traumáticas del Encéfalo/fisiopatología , Lesiones Traumáticas del Encéfalo/psicología , Brasil , Circulación Cerebrovascular/efectos de la radiación , Lesión Axonal Difusa/diagnóstico , Lesión Axonal Difusa/fisiopatología , Lesión Axonal Difusa/psicología , Método Doble Ciego , Femenino , Escala de Coma de Glasgow , Humanos , Láseres de Semiconductores/efectos adversos , Terapia por Luz de Baja Intensidad/efectos adversos , Masculino , Persona de Mediana Edad , Examen Neurológico , Calidad de Vida , Ensayos Clínicos Controlados Aleatorios como Asunto , Recuperación de la Función , Factores de Tiempo , Resultado del Tratamiento , Adulto Joven
8.
PLoS One ; 7(4): e35751, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22558216

RESUMEN

Few studies have investigated physiologic and cognitive effects of "long-term" electromagnetic field (EMF) exposure in humans or animals. Our recent studies have provided initial insight into the long-term impact of adulthood EMF exposure (GSM, pulsed/modulated, 918 MHz, 0.25-1.05 W/kg) by showing 6+ months of daily EMF treatment protects against or reverses cognitive impairment in Alzheimer's transgenic (Tg) mice, while even having cognitive benefit to normal mice. Mechanistically, EMF-induced cognitive benefits involve suppression of brain ß-amyloid (Aß) aggregation/deposition in Tg mice and brain mitochondrial enhancement in both Tg and normal mice. The present study extends this work by showing that daily EMF treatment given to very old (21-27 month) Tg mice over a 2-month period reverses their very advanced brain Aß aggregation/deposition. These very old Tg mice and their normal littermates together showed an increase in general memory function in the Y-maze task, although not in more complex tasks. Measurement of both body and brain temperature at intervals during the 2-month EMF treatment, as well as in a separate group of Tg mice during a 12-day treatment period, revealed no appreciable increases in brain temperature (and no/slight increases in body temperature) during EMF "ON" periods. Thus, the neuropathologic/cognitive benefits of EMF treatment occur without brain hyperthermia. Finally, regional cerebral blood flow in cerebral cortex was determined to be reduced in both Tg and normal mice after 2 months of EMF treatment, most probably through cerebrovascular constriction induced by freed/disaggregated Aß (Tg mice) and slight body hyperthermia during "ON" periods. These results demonstrate that long-term EMF treatment can provide general cognitive benefit to very old Alzheimer's Tg mice and normal mice, as well as reversal of advanced Aß neuropathology in Tg mice without brain heating. Results further underscore the potential for EMF treatment against AD.


Asunto(s)
Enfermedad de Alzheimer/radioterapia , Péptidos beta-Amiloides/metabolismo , Circulación Cerebrovascular/efectos de la radiación , Magnetoterapia/métodos , Enfermedad de Alzheimer/metabolismo , Enfermedad de Alzheimer/patología , Animales , Temperatura Corporal/efectos de la radiación , Cognición/efectos de la radiación , Modelos Animales de Enfermedad , Campos Electromagnéticos , Humanos , Aprendizaje por Laberinto/efectos de la radiación , Memoria/efectos de la radiación , Ratones , Ratones Transgénicos , Mitocondrias/efectos de la radiación , Desempeño Psicomotor/efectos de la radiación
9.
J Neuroradiol ; 39(3): 167-75, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-21835468

RESUMEN

OBJECTIVES: Transcutaneous cranial electrical stimulation (TCES) delivers a high-frequency (166 kHz) pulsed biphasic balanced current with a pulse repetition frequency of 100 Hz with 40% duty cycle through a negative electrode and two positive electrodes over the skull. TCES has a proven ability to potentiate anesthesia and analgesia, although the physiological mechanisms of this effect remain unclear. We hypothesized that the mechanism is a modulation of CBF in the central endogenous opioid system. This study aimed at determining the effects of TCES on CBF to elucidate its physiological mechanism. METHODS: Thirty-six healthy volunteers were randomly assigned to active or placebo TCES, and all assessments were double blind. TCES was performed using the Anesthelec™ device. In the stimulated group, an active cable was used, and in the control group (sham), the cable was inactive. CBF was measured by XeCT™ before and after two hours of TCES. RESULTS: Globally, CBF was unchanged by TCES. However, locally, TCES induced a significant CBF decrease in the brainstem and thalamus, which are structures involved in pain and anxiety (TCES and control CBF decrease were 18.5 and 11.9 mL/100g brain tissue/min, respectively). CONCLUSION: TCES can modulate local CBF but it has no effect on overall CBF. [Clinical Trials. gov number: NCT00273663].


Asunto(s)
Tronco Encefálico/fisiología , Circulación Cerebrovascular/fisiología , Tálamo/fisiología , Estimulación Eléctrica Transcutánea del Nervio/métodos , Adulto , Velocidad del Flujo Sanguíneo/fisiología , Velocidad del Flujo Sanguíneo/efectos de la radiación , Tronco Encefálico/efectos de la radiación , Circulación Cerebrovascular/efectos de la radiación , Femenino , Humanos , Masculino , Tálamo/efectos de la radiación
10.
Cell Mol Neurobiol ; 31(1): 57-63, 2011 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-20703797

RESUMEN

No study has systematically studied the relevance of original Izumo strain of spontaneously hypertensive rats (SHR/Izm) as a stroke model. Furthermore, both SHR/Izm and stroke-prone SHR/Izm (SHRSP/Izm) are commercially available, and recent progress in genetic studies allowed us to use several congenic strains of rats constructed with SHR/Izm and SHRSP/Izm as the genetic background strains. A total of 166 male SHR/Izm and 17 male SHRSP/Izm were subjected to photothrombotic middle cerebral artery (MCA) occlusion with or without YAG laser-induced reperfusion. The pattern of distal MCA was recorded. Infarct volumes were determined with 2,3,5-triphenyltetrazolium chloride. At 24 or 48 h after MCA occlusion, infarct volumes in the permanent occlusion and 2-h occlusion groups (88 ± 22 [SD] and 87 ± 25 mm³, respectively) were significantly larger than that in the 1-h occlusion group (45 ± 14 mm³), indicating the presence of sizeable zone of penumbra. Infarct size in SHRSP/Izm determined at 24 h after MCA occlusion was fairly large (124.0 ± 34.8 mm³, n = 10). Infarct volume in SHR/Izm with simple distal MCA was 76 ± 19 mm³, which was significantly smaller than 95 ± 22 mm³ in the other SHR/Izm with more branching MCA. These data suggest that this stroke model in SHR/Izm is useful in the preclinical testing of stroke therapies and elucidating the pathophysiology of cerebral ischemia/reperfusion.


Asunto(s)
Infarto de la Arteria Cerebral Media/patología , Infarto de la Arteria Cerebral Media/radioterapia , Láseres de Estado Sólido/uso terapéutico , Terapia por Luz de Baja Intensidad , Reperfusión/métodos , Animales , Presión Sanguínea/fisiología , Circulación Cerebrovascular/fisiología , Circulación Cerebrovascular/efectos de la radiación , Modelos Animales de Enfermedad , Terapia por Luz de Baja Intensidad/métodos , Masculino , Arteria Cerebral Media/fisiopatología , Ratas , Ratas Endogámicas SHR , Reperfusión/instrumentación
12.
Nature ; 465(7299): 788-92, 2010 Jun 10.
Artículo en Inglés | MEDLINE | ID: mdl-20473285

RESUMEN

Despite a rapidly-growing scientific and clinical brain imaging literature based on functional magnetic resonance imaging (fMRI) using blood oxygenation level-dependent (BOLD) signals, it remains controversial whether BOLD signals in a particular region can be caused by activation of local excitatory neurons. This difficult question is central to the interpretation and utility of BOLD, with major significance for fMRI studies in basic research and clinical applications. Using a novel integrated technology unifying optogenetic control of inputs with high-field fMRI signal readouts, we show here that specific stimulation of local CaMKIIalpha-expressing excitatory neurons, either in the neocortex or thalamus, elicits positive BOLD signals at the stimulus location with classical kinetics. We also show that optogenetic fMRI (of MRI) allows visualization of the causal effects of specific cell types defined not only by genetic identity and cell body location, but also by axonal projection target. Finally, we show that of MRI within the living and intact mammalian brain reveals BOLD signals in downstream targets distant from the stimulus, indicating that this approach can be used to map the global effects of controlling a local cell population. In this respect, unlike both conventional fMRI studies based on correlations and fMRI with electrical stimulation that will also directly drive afferent and nearby axons, this of MRI approach provides causal information about the global circuits recruited by defined local neuronal activity patterns. Together these findings provide an empirical foundation for the widely-used fMRI BOLD signal, and the features of of MRI define a potent tool that may be suitable for functional circuit analysis as well as global phenotyping of dysfunctional circuitry.


Asunto(s)
Encéfalo/citología , Encéfalo/efectos de la radiación , Imagen por Resonancia Magnética , Vías Nerviosas/efectos de la radiación , Neuronas/metabolismo , Neuronas/efectos de la radiación , Potenciales de Acción/efectos de la radiación , Anestesia , Animales , Encéfalo/anatomía & histología , Encéfalo/irrigación sanguínea , Circulación Cerebrovascular/efectos de la radiación , Chlorophyta , Mediciones Luminiscentes , Proteínas Luminiscentes/genética , Proteínas Luminiscentes/metabolismo , Corteza Motora/irrigación sanguínea , Corteza Motora/citología , Corteza Motora/metabolismo , Corteza Motora/efectos de la radiación , Neuronas/clasificación , Neuronas/citología , Oxígeno/sangre , Oxígeno/metabolismo , Estimulación Luminosa , Ratas , Rodopsina/genética , Rodopsina/metabolismo , Rodopsina/efectos de la radiación , Tálamo/irrigación sanguínea , Tálamo/citología , Tálamo/metabolismo , Tálamo/efectos de la radiación
13.
Aviakosm Ekolog Med ; 43(4): 51-5, 2009.
Artículo en Ruso | MEDLINE | ID: mdl-19943523

RESUMEN

Influence of infrared cold laser emission (IRCL) on the dynamic equilibrium between lipid peroxidation and tension of the antioxidant defense system in rat's tissues (blood, brain, retina, cornea) was evaluated in animals with circulatory cerebral hypoxia induced by occlusion of the left carotid artery. Tissues of white rats were examined for IRCL effects on hemiluminescence, malonic dialdehyde, SOD and catalase activities on the background of circulatory cerebral hypoxia. Data of the experiment evidenced an antioxidant effect of posthypoxic IRCL therapy as it reduces intensity of the free radical processes in plasma, cerebral tissues and retina. The experiment demonstrated the IRCL ability to modulate LPO, to stiffen the antioxidant defense system in the event of eye diseases originated from circulatory hypoxia of the ocular analyzer.


Asunto(s)
Encéfalo/metabolismo , Circulación Cerebrovascular/efectos de la radiación , Córnea/metabolismo , Depuradores de Radicales Libres/metabolismo , Hipoxia Encefálica/radioterapia , Terapia por Luz de Baja Intensidad/métodos , Retina/metabolismo , Animales , Encéfalo/efectos de la radiación , Córnea/efectos de la radiación , Modelos Animales de Enfermedad , Progresión de la Enfermedad , Depuradores de Radicales Libres/efectos de la radiación , Hipoxia Encefálica/metabolismo , Masculino , Ratas , Retina/efectos de la radiación
14.
Acta Neurochir Suppl ; 101: 65-70, 2008.
Artículo en Inglés | MEDLINE | ID: mdl-18642636

RESUMEN

OBJECTIVE: To evaluate change in regional cerebral perfusion (rCBF) after median nerve stimulation (MNS) therapy in brain-damaged patients. METHODS: Twelve brain-damaged patients received 12 courses of MNS. Technetium-99m-ethyl cysteinate diethylester (99mTc-ECD) SPECT was performed before and 4 weeks after MNS initiation. Clinical response was assessed by Glasglow coma scale or clinical improvement. 12 MNS patients were grouped as good responder (GR) (n = 6) and poor responder (PR) (n = 6) according to therapy response. Scan images were analyzed by Statistical Parametric Mapping 2 (SPM2). RESULTS: In the GR group, paired Student t test between the pre- and post-MNS images showed 2 activation clusters over the left frontal and parietal lobes, including regions of the precentral gyrus, middle frontal gyrus, superior frontal gyrus, subgyral, inferior parietal lobule, and postcentral gyms (corresponding to Brodmann areas 4, 6, and 40). In the PR group, paired Student t test did not show any activation clusters. Clusters with significant differences between the GR and PR groups shared no mutual voxels with those clusters having significant regional effects after MNS in the GR group. CONCLUSIONS: Median nerve stimulation enhanced the rCBF of the contralateral motor and somatosensory cortex, which is compatible with the few previous studies using other modalities.


Asunto(s)
Daño Encefálico Crónico/terapia , Circulación Cerebrovascular/efectos de la radiación , Terapia por Estimulación Eléctrica/métodos , Lateralidad Funcional/fisiología , Nervio Mediano/efectos de la radiación , Corteza Motora/irrigación sanguínea , Corteza Somatosensorial/irrigación sanguínea , Adolescente , Adulto , Anciano , Daño Encefálico Crónico/diagnóstico por imagen , Daño Encefálico Crónico/patología , Mapeo Encefálico , Circulación Cerebrovascular/fisiología , Femenino , Humanos , Masculino , Nervio Mediano/fisiología , Persona de Mediana Edad , Corteza Motora/diagnóstico por imagen , Radiofármacos , Corteza Somatosensorial/diagnóstico por imagen , Exametazima de Tecnecio Tc 99m , Tomografía Computarizada de Emisión de Fotón Único
15.
Artículo en Ruso | MEDLINE | ID: mdl-17647311

RESUMEN

The authors propose combined therapy improving cerebral circulation in patients in an intermediate period of a mild craniocerebral trauma. The combination consists of radon baths and transcranial magnetotherapy which raise blood volume filling, relieve vascular resistance, improve venous outflow.


Asunto(s)
Baños/métodos , Circulación Cerebrovascular/efectos de la radiación , Traumatismos Craneocerebrales/terapia , Radón/uso terapéutico , Estimulación Magnética Transcraneal , Adolescente , Adulto , Terapia Combinada , Femenino , Humanos , Masculino , Persona de Mediana Edad , Resultado del Tratamiento
16.
Lik Sprava ; (3): 51-4, 2006.
Artículo en Ruso | MEDLINE | ID: mdl-17100186

RESUMEN

Twenty three patients aged from 41 to 75, which have had ischemic stroke in the carotid basin (up to 2 years after an acute period of the stroke), have been examined. The course of magneto-laser therapy lasted 15 days. The author carried out neurological examinations, determined the state of psychoemotional activity, cerebral hemodynamics and frequency-amplitude indices of the brain to assess the mechanisms of MLT effect on the CNS functional state in patients being in a rehabilitative period after ischemic stroke. The course of MLT administration improves cerebral hemodynamics, increases the level of the bioelectrical activity of the brain. We can recommend based on obtained results MLT in the system of rehabilitation of patients which had had ischemic stroke.


Asunto(s)
Isquemia Encefálica/complicaciones , Circulación Cerebrovascular/efectos de la radiación , Terapia por Luz de Baja Intensidad/métodos , Magnetismo/uso terapéutico , Accidente Cerebrovascular/radioterapia , Adulto , Anciano , Velocidad del Flujo Sanguíneo/efectos de la radiación , Electroencefalografía , Humanos , Persona de Mediana Edad , Accidente Cerebrovascular/etiología , Accidente Cerebrovascular/fisiopatología , Resultado del Tratamiento , Ultrasonografía Doppler
17.
Neuropsychobiology ; 51(4): 265-8, 2005.
Artículo en Inglés | MEDLINE | ID: mdl-15905632

RESUMEN

BACKGROUND AND OBJECTIVES: Vagus nerve stimulation (VNS) is an approved treatment of partial onset seizures and has recently shown antidepressant effects in patients with treatment-resistant depression. This study was conducted to investigate whether acute VNS has an influence on cerebral blood flow (CBF) in humans. METHODS: This investigation was designed as an add-on study. In 10 patients with an implanted stimulator who participated in a multicenter clinical trial to evaluate the efficacy of VNS in depression, CBF was investigated by functional transcranial Doppler at baseline (before the stimulator was turned on for the first time) and during stimulation with three different stimulation intensities in a randomized order. RESULTS: Immediately after every increase of the current, CBF velocity showed a nonsignificant increase. Otherwise, no change of CBF above standard deviation could be registered. CONCLUSION: Acute VNS does not have an influence on CBF velocity in depressive patients.


Asunto(s)
Corteza Cerebral/efectos de la radiación , Circulación Cerebrovascular/efectos de la radiación , Trastorno Depresivo Mayor/terapia , Terapia por Estimulación Eléctrica , Ultrasonografía Doppler Transcraneal/métodos , Nervio Vago/efectos de la radiación , Adulto , Tiempo de Circulación Sanguínea/métodos , Corteza Cerebral/irrigación sanguínea , Trastorno Depresivo Mayor/fisiopatología , Relación Dosis-Respuesta en la Radiación , Femenino , Humanos , Masculino , Persona de Mediana Edad
18.
Acta Neurochir (Wien) ; 147(2): 175-85; discussion 185-6, 2005 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-15565485

RESUMEN

OBJECTIVE: To determine the applicability and safety of a new canine model suitable for correlative magnetic resonance imaging (MRI) studies and morphological/pathophysiological examination over time after interstitial laser thermotherapy (ILTT) in brain tissue. MATERIAL AND METHODS: A laser fibre (Diode Laser 830 nm) with an integrated temperature feedback system was inserted into the right frontal white matter in 18 dogs using frameless navigation technique. MRI thermometry (phase mapping i.e. chemical shift of the proton resonance frequency) during interstitial heating was compared to simultaneously recorded interstitial fiberoptic temperature readings on the border of the lesion. To study brain capillary function in response to ILTT over time quantitative autoradiography was performed investigating the unidirectional blood-to-tissue transport of carbon-14-labelled alpha amino-isobutyric acid (transfer constant K of AIB) 12, 36 hours, 7, 14 days, 4 weeks and 3 months after ILTT. RESULTS: All laser procedures were well tolerated, laser and temperature fibres could be adequately placed in the right frontal lobe in all animals. In 5 animals MRI-based temperature quantification correlated strongly to invasive temperature measurements. In the remaining animals the temperature fibre was located in the area of susceptibility artifacts, therefore, no temperature correlation was possible. The laser lesions consisted of a central area of calcified necrosis which was surrounded by an area of reactive brain tissue with increased permeability. Quantitative autoradiography indicated a thin and spherical blood brain barrier lesion. The magnitude of K of AIB increased from 12 hours to 14 days after ILTT and decreased thereafter. The mean value of K of AIB was 19 times (2 times) that of normal white matter (cortex), respectively. CONCLUSION: ILTT causes transient, highly localised areas of increased capillary permeability surrounding the laser lesion. Phase contrast imaging for MRI thermomonitoring can currently not be used for reliable temperature readings in vivo. The suggested new canine model proved to be safe, accurate, easy to use, and provides clinical, radiographic, pathological and physiological correlations.


Asunto(s)
Mapeo Encefálico/métodos , Circulación Cerebrovascular/efectos de la radiación , Lóbulo Frontal/cirugía , Terapia por Láser/métodos , Imagen por Resonancia Magnética/métodos , Neuronavegación/métodos , Ácidos Aminoisobutíricos/farmacocinética , Animales , Autorradiografía/métodos , Barrera Hematoencefálica/fisiopatología , Barrera Hematoencefálica/efectos de la radiación , Temperatura Corporal/fisiología , Temperatura Corporal/efectos de la radiación , Mapeo Encefálico/instrumentación , Radioisótopos de Carbono , Circulación Cerebrovascular/fisiología , Desnervación , Perros , Encefalitis/etiología , Encefalitis/patología , Encefalitis/fisiopatología , Femenino , Lóbulo Frontal/anatomía & histología , Terapia por Láser/efectos adversos , Terapia por Láser/instrumentación , Imagen por Resonancia Magnética/instrumentación , Masculino , Microcirculación/fisiología , Microcirculación/efectos de la radiación , Modelos Animales , Necrosis/etiología , Necrosis/patología , Necrosis/fisiopatología , Neuronavegación/instrumentación , Complicaciones Posoperatorias/etiología , Complicaciones Posoperatorias/patología , Complicaciones Posoperatorias/fisiopatología
19.
Neurol Res ; 26(7): 797-800, 2004 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-15494125

RESUMEN

AIMS: The electrical point stimulation system (P-STIM) reflects a new, miniaturized system for pain therapy through ear acupuncture. For this reason, ultrathin needles were applied at the ear. The needles stimulate the acupuncture areas at the ear using electrical impulses, which come from a little generator applied behind the acupunctured ear. METHODS: This study describes continuous, non-invasive measurements of near infrared spectroscopy (NIRS) and multidirectional transcranial Doppler sonography in two healthy females (aged 23 and 27 years) during stimulation with P-STIM, for the first time. RESULTS: The results of the pilot measurements have shown that electrical point stimulation using the new electrical stimulation system on eye acupuncture points is able to modulate the mean blood flow velocity (vm) of the supratrochlear artery. These effects were present using a stimulation frequency of 100 Hz. A lower increase in vm was found in the middle cerebral artery. In addition, stimulus induced, quantifiable and reproducible alterations of the regional cerebral NIRS parameters were be detected. CONCLUSION: For the first time, P-Stim allows intermittent ear acupuncture stimulation for up to several days in combination with complete mobility for the patient.


Asunto(s)
Acupuntura Auricular , Circulación Cerebrovascular/efectos de la radiación , Estimulación Eléctrica , Manejo del Dolor , Puntos de Acupuntura , Adulto , Velocidad del Flujo Sanguíneo/efectos de la radiación , Arterias Cerebrales/fisiopatología , Arterias Cerebrales/efectos de la radiación , Femenino , Humanos , Reproducibilidad de los Resultados , Espectroscopía Infrarroja Corta/métodos , Resultado del Tratamiento , Ultrasonografía Doppler Transcraneal/métodos
20.
Artículo en Ruso | MEDLINE | ID: mdl-15052835

RESUMEN

The results were compared of different programs of rehabilitation in 45 patients aged 5 to 18 years with spinal deformities and vertebrobasilar failure. Control patients received only basic therapy, the study group received also EHF-puncture. The efficacy of rehabilitation was confirmed by electropuncture diagnosis and rheoencephalogram. The patients with high tonicity of small vessels demonstrated a significantly improved regional circulation. This favours differential use of EHF puncture in the complex of rehabilitative measures.


Asunto(s)
Terapia por Acupuntura/métodos , Circulación Cerebrovascular/efectos de la radiación , Microondas/uso terapéutico , Enfermedades de la Columna Vertebral/complicaciones , Insuficiencia Vertebrobasilar/rehabilitación , Puntos de Acupuntura , Adolescente , Niño , Preescolar , Terapia Combinada , Femenino , Humanos , Masculino , Síndrome , Insuficiencia Vertebrobasilar/complicaciones , Insuficiencia Vertebrobasilar/fisiopatología
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