Influence of bronchopulmonary dysplasia on cerebral blood flow in preterm infants: a prospective study based on arterial spin labeling / 中国当代儿科杂志

OBJECTIVES@#To investigate local cerebral blood perfusion in preterm infants with bronchopulmonary dysplasia (BPD) based on cerebral blood flow (CBF) values of arterial spin labeling (ASL).@*METHODS@#A prospective study was conducted on 90 preterm infants with a gestational age of <32 weeks and a birth weight of <1 500 g who were born in the Department of Obstetrics and admitted to the Department of Neonatology in the Third Affiliated Hospital of Zhengzhou University from August 2021 to June 2022. All of the infants underwent cranial MRI and ASL at the corrected gestational age of 35-40 weeks. According to the presence or absence of BPD, they were divided into a BPD group with 45 infants and a non-BPD group with 45 infants. The two groups were compared in terms of the CBF values of the same regions of interest (frontal lobe, temporal lobe, parietal lobe, occipital lobe, thalamus, and basal ganglia) on ASL image.@*RESULTS@#Compared with the non-BPD group, the BPD group had a significantly lower 1-minute Apgar score, a significantly longer duration of assisted ventilation, and a significantly higher incidence rate of fetal distress (P<0.05). After control for the confounding factors such as corrected age and age at the time of cranial MRI by multiple linear regression analysis, compared with the non-BPD group, the BPD group still had higher CBF values of the frontal lobe, temporal lobe, parietal lobe, occipital lobe, basal ganglia, and thalamus at both sides (P<0.05).@*CONCLUSIONS@#BPD can increase cerebral blood perfusion in preterm infants, which might be associated with hypoxia and a long duration of assisted ventilation in the early stage.

Signal Conversion and Isolation Processing Technology Used in the Cerebrovascular Stroke Detector / 中国医疗器械杂志

By using Doppler sensor and pressure sensor, the cerebrovascular stroke detector can be used to measure the blood flow velocity and blood pressure of the carotid artery. In this study, a variety of signal conversion and isolation processing techniques are proposed for processing and feature extraction of the output signals from the sensors. Finally, effective signal output waveforms that can be used to evaluate the cerebrovascular hemodynamics index (CVHI) are obtained, and the sound signal outputs that can reflect the change characteristics of blood flow velocity and blood pressure signals are generated, which realizes the application functional requirements of the detector.

Chronic hypoperfusion due to intracranial large artery stenosis is not associated with cerebral β-amyloid deposition and brain atrophy / 中华医学杂志(英文版)

BACKGROUND@#Insufficient cerebral perfusion is suggested to play a role in the development of Alzheimer disease (AD). However, there is a lack of direct evidence indicating whether hypoperfusion causes or aggravates AD pathology. We investigated the effect of chronic cerebral hypoperfusion on AD-related pathology in humans.@*METHODS@#We enrolled a group of cognitively normal patients (median age: 64 years) with unilateral chronic cerebral hypoperfusion. Regions of interest with the most pronounced hypoperfusion changes were chosen in the hypoperfused region and were then mirrored in the contralateral hemisphere to create a control region with normal perfusion. 11C-Pittsburgh compound-positron emission tomography standard uptake ratios and brain atrophy indices were calculated from the computed tomography images of each patient.@*RESULTS@#The median age of the 10 participants, consisting of 4 males and 6 females, was 64 years (47-76 years). We found that there were no differences in standard uptake ratios of the cortex (volume of interest [VOI]: P = 0.721, region of interest [ROI]: P = 0.241) and grey/white ratio (VOI: P = 0.333, ROI: P = 0.445) and brain atrophy indices (Bicaudate, Bifrontal, Evans, Cella, Cella media, and Ventricular index, P > 0.05) between the hypoperfused regions and contralateral normally perfused regions in patients with unilateral chronic cerebral hypoperfusion.@*CONCLUSION@#Our findings suggest that chronic hypoperfusion due to large vessel stenosis may not directly induce cerebral β-amyloid deposition and neurodegeneration in humans.

Reemplazo de aorta ascendente con paro circulatorio con hipotermia sistémica moderada y perfusión cerebral retrógrada / Total replacement of the ascending aorta with moderate systemic hypothermic circulatory arrest and retrograde cerebral perfusion

Resumen: Antecedentes: El daño neurológico es una complicación devastadora de la cirugía con paro circulatorio del cayado aórtico y aorta ascendente. La perfusión anterógrada del encéfalo permite disminuir la incidencia de esta complicación, pero es un procedimiento engorroso que interfiere el campo quirúrgico. Para procedimientos más simples que requieran de paro circulatorio de menor duración, la Perfusión Cerebral Retrógrada (PCR) es una alternativa válida. Objetivo: Evaluar nuestros resultados en la cirugía del reemplazo total de la aorta ascendente tubular con paro circulatorio con hipotermia sistémica moderada y PCR. Material y Método: Entre enero de 2015 y enero de 2020 se identificaron los pacientes en la Base de Datos del Servicio de Cirugía Cardiaca de nuestra institución, se revisaron los protocolos operatorios, registros de perfusión y epicrisis, para obtener datos demográficos, clínicos y quirúrgicos pertinentes. La supervivencia alejada se certificó a través del "Servicio Registro Civil e Identificación de Chile". Resultados: En el periodo en estudio, 27 pacientes (21 hombres) tuvieron un reemplazo total de la aorta ascendente tubular con paro circulatorio con hipotermia moderada y PCR. Ocho pacientes tenían una cirugía previa; 7 de estos un reemplazo valvular aórtico. El 75% de los otros 20 pacientes tenía una válvula aórtica bicúspide. El diámetro máximo de la aorta ascendente fue en promedio 53,7 mm (45 a 67), y fue reemplazada en el 52% de los casos con un tubo protésico de 34 mm (promedio:32,4 mm; margen:30 a 34 mm). En 20 pacientes se efectuó un reemplazo valvular aórtico (15 con prótesis biológica). El tiempo promedio de circulación extracorpórea fue 174,6 min (97 a 243) y la temperatura sistémica mínima promedio fue 21ºC (18 a 25). El tiempo promedio de paro circulatorio fue 22,3 min (12 a 40) y de PCR 13 min (6 a 27). No hubo mortalidad operatoria. La morbilidad más frecuente fue la fibrilación auricular (33%). Una paciente presentó un episodio convulsivo aislado y otro fue reoperado por hemorragia postoperatoria. Una paciente falleció a los 48 meses de su operación. Conclusión: El paro circulatorio con hipotermia sistémica moderada y PCR para la cirugía de reemplazo total de la aorta ascendente facilitó la operación, con baja mortalidad y morbilidad en este grupo de pacientes.

Abstract: Background. Neurological damage is a devastating complication of aortic arch and ascending aorta surgery with deep hypothermic circulatory arrest. Antegrade cerebral perfusion significantly decreases the incidence of this complication, but it is a cumbersome procedure that interfere the surgical field. For more simple procedures, requiring a shorter period of circulatory arrest, retrograde cerebral perfusion (RCP) would be a valid alternative. Objective. To evaluate the results of total surgical replacement of the tubular ascending aorta with moderate hypothermic circulatory arrest and retrograde cerebral perfusion (RCP). Methods. Patients operated between January 2015 and January 2020 were included.Demographic, clinical and surgical information was obtained from the operatives notes, perfusion registry and discharge reports. Long-term survival was certified by the "Chilean Civil and Identification Registry". Results. 27 patients (21 men) underwent a total replacement of the tubular ascending aorta with circulatory arrest with moderate hypothermia and RCP. Eight patients had been previously operated on;7 of them had a previous aortic valve replacement. Of the remaining 20 patients, 75% had a bicuspid aortic valve. Average maximum diameter of the ascending aorta was 53.7 mm (45 - 67). Average size of the ascending aorta replacement graft was 32.4 mm (30 -34). In 20 patients a concomitant aortic valve replacement was performed (15 with a biological valve). Mean extracorporeal circulation time was 174.6 min (97 - 243) and mean minimal systemic temperature was 21ºC (18 - 25). Mean circulatory arrest time was 22.3 min (12 - 40) and mean RCP time was 13 min (6 - 27), There was no operative mortality. Atrial fibrillation was the most frequent post-operative morbidity (33%). One patient presented an isolated convulsive episode and another was re-operated due to postoperative hemorrhage. One patient died, 48 months after her operation. Conclusion. Moderate hypothermic circulatory arrest with RCP simplifies total tubular ascending aorta replacement, with low mortality and morbidity.

Manifestaciones neuroftalmológicas en pacientes con enfermedad cerebrovascular isquémica / Neuro-ophthalmological manifestations in patients with ischemic cerebrovascular disease

La enfermedad cerebrovascular isquémica tiene una elevada incidencia y prevalencia en Cuba, y constituye la tercera causa de muerte en el país. Existen diferencias anatómicas y clínicas entre el infarto de la circulación anterior y la posterior. En ocasiones, los elementos distintivos que ayudan al diagnóstico topográfico de la enfermedad cerebrovascular isquémica son las manifestaciones neuroftalmológicas. Con el objetivo de profundizar en el conocimiento actual sobre las alteraciones neuroftalmológicas que se asocian a la enfermedad cerebrovascular isquémica, se realizó una revisión bibliográfica, donde se consultaron un total de 69 fuentes de información digital de los últimos 5 años. La circulación cerebral se divide de manera general en anterior y posterior. Los síntomas y signos principales del ictus que afecta la circulación anterior son la desviación conjugada de la mirada, la afectación de las sácadas, la hemianopsia homónima, la heminegligencia y la apraxia de la apertura ocular; mientras que las alteraciones asociadas a la afectación de la circulación posterior son el nistagmo, las anormalidades en la alineación y los movimientos oculares, así como la hemianopsia homónima con conservación macular. Se concluye que en la enfermedad cerebrovascular isquémica aparecen síntomas y signos como consecuencia de la afectación, tanto de la vía visual aferente, como de la eferente. La hemianopsia homónima es el signo más frecuente reportado(AU)

Ischemic cerebrovascular disease has a high incidence and prevalence in Cuba, and it is the third cause of death in the country. A number of anatomical and clinical differences distinguish anterior from posterior circulation infarction. On certain occasions the distinguishing elements that aid in the topographic diagnosis of ischemic cerebrovascular disease are its neuro-ophthalmological manifestations. With the purpose of gaining insight into the current knowledge about the neuro-ophthalmological alterations associated to ischemic cerebrovascular disease, a bibliographic review was conducted based on the analysis of 69 digital information sources from the last five years. Cerebral circulation is generally divided into anterior and posterior. The main symptoms and signs of the stroke that affects anterior circulation are conjugate gaze deviation, altered saccades, homonymous hemianopsia, heminegligence and eyelid opening apraxia, whereas the alterations associated to posterior circulation involvement are nystagmus, eye movement and alignment abnormalities, and homonymous hemianopsia with macular preservation. It is concluded that ischemic cerebrovascular disease presents symptoms and signs related to both the afferent and the efferent visual pathways. Homonymous hemianopsia is the most common sign reported(AU)

Mild poikilocapnic hypoxia increases very low frequency haemoglobin oxygenation oscillations in prefrontal cortex

BACKGROUND: The aim of the study was to investigate the effect of mild cerebral hypoxia on haemoglobin oxygenation (HbO2), cerebrospinal fluid dynamics and cardiovascular physiology. To achieve this goal, four signals were recorded simultaneously: blood pressure, heart rate / electrocardiogram, HbO2 from right hemisphere and changes of subarachnoid space (SAS) width from left hemisphere. Signals were registered from 30 healthy, young participants (2 females and 28 males, body mass index = 24.5 ± 2.3 kg/m2, age 30.8 ± 13.4 years). RESULTS: We analysed the recorded signals using wavelet transform and phase coherence. We demonstrated for the first time that in healthy subjects exposed to mild poikilokapnic hypoxia there were increases in very low frequency HbO2 oscillations (< 0.052 Hz) in prefrontal cortex. Additionally, SAS fluctuation diminished in the whole frequency range which could be explained by brain oedema. CONCLUSIONS: Consequently the study provides insight into mechanisms governing brain response to a mild hypoxic challenge. Our study supports the notion that HbO2 and SAS width monitoring might be beneficial for patients with acute lung disease.

Effect of combination of acupuncture and psychological intervention on attention, response inhibition and cerebral blood flow in children with attention deficit hyperactivity disorder / 中国针灸

OBJECTIVE@#To observe the clinical curative effect on attention deficit hyperactivity disorder (ADHD) and explore the relevant mechanism of acupuncture in treatment.@*METHODS@#A total of 100 ADHD children were randomized into an observation group (50 cases, 2 cases dropped off) and a control group (50 cases, 1 case dropped off). In the control group, the routine psychological intervention was used. In the observation group, on the base of the treatment as the control group, acupuncture was applied to Taichong (LR 3), Neiguan (PC 6), Shenmen (HT 7), Sanyinjiao (SP 6), Baihui (GV 20), Sishencong (EX-HN 1), etc., once daily, for 3 months. The Cambridge neuropsychological tests automated battery (CANTAB) was adopted to evaluate attention and response inhibition in two groups before and after treatment. Digi-Lite color transcranial Doppler was used to measure cerebral arterial blood velocity. The therapeutic effect was compared between the two groups.@*RESULTS@#Regarding evaluation of attention, the mean delay time in the observation group after treatment was shorter than that before treatment and that in the control group separately (@*CONCLUSION@#Acupuncture combined with psychological intervention may improve attention and response inhibition in ADHD children, which is possibly related to the regulation of cerebral blood flow.

Variantes anatómicas del círculo arterial cerebral en un anfiteatro universitario en Bogotá (Colombia) / Anatomical Variations of Arterial Cerebral Circle in an Amphitheater of a University in Bogotá, Colombia / Variantes anatômicas do círculo arterial cerebral em um anfiteatro universitário em Bogotá, Colômbia

Resumen Introducción: el cerebro es un órgano altamente irrigado, y esta irrigación es suministrada por el círculo arterial cerebral: una red arterial anastomótica con frecuentes variaciones anatómicas, algunas asociadas con patologías. El objetivo es describir las características antropométricas y variaciones anatómicas del círculo arterial cerebral en una muestra de especímenes cadavéricos humanos. Materiales y métodos: se revisaron 50 encéfalos, de los cuales 24 cumplieron con los criterios de inclusión. Se realizaron medidas de diámetro y longitud y también se describieron variaciones anatómicas y variaciones morfométricas. Resultados: siete especímenes evidenciaron variaciones anatómicas (29.1 %); 3 (12.5 %), arteria cerebral anterior (ACA) ácigos; uno (4.1 %), doble ACA en el segmento A1; uno (4.1 %), triple ACA en el segmento A2 y doble arteria comunicante anterior (AcomA); uno (4.1 %), agenesia de la arteria comunicante posterior (AComP) derecha; uno (4.1 %), de la AComP izquierda. El 29.1 % presentó variaciones antropométricas; el 12.5 %, hipoplasia de la AComP derecha; el 12.5 %>, de la AComP izquierda, y el 4.1 %>, hipoplasia bilateral de la AComP. Conclusión: la presencia de variaciones anatómicas fue inferior a la hallada en otros estudios, con predominio de variantes de la circulación anterior. Se describe la presencia de triple ACA en el segmento A2 y doble arteria comunicante anterior.

Abstract Introduction: The brain is a highly irrigated organ; this irrigation is supplied by the cerebral arterial circle: an anastomotic arterial network with frequent anatomical variations, some of which are associated with pathologies. This study aimed to describe the anthropometric characteristics and anatomical variations of the cerebral arterial circle in a sample of human cadaveric specimens. Materials and Methods: A total of 50 brains were examined, 24 of which met the inclusion criteria. Diameter and length measurements were obtained, and anatomical and morphometric variations were described. Results: Seven specimens (29.1%) had anatomical variations: 3 (12.5%) had azygos anterior cerebral artery (ACA), 1 (4.1%) had double ACA in segment A1, 1 (4.1%) had triple ACA in segment A2 and double anterior communicating artery (AcomA), 1 (4.1%) had right posterior communicating artery (AComP) agenesis, and 1 (4.1%) had left AComP agenesis. Seven specimens (29.1%) had anthropometric variations: 3 (12.5%) had hypoplasia of right AComP and 3 (12.5%) of left AComP and 1 (4.1%) had bilateral hypoplasia of AComP. Conclusion: The presence of ana-tomical variations was lower than that reported in other studies, with a predominance of variations of the anterior circulation. The presence of triple ACA in segment A2 and double AcomA was described.

Resumo Introdução: o cérebro é um órgão altamente irrigado; esta irrigação é fornecida pelo círculo arterial cerebral: uma rede arterial anastomótica com frequentes variações anatómicas, algumas associadas a patologias. O objetivo é escrever as características antropométricas e variações anatômicas do círculo arterial cerebral em uma amostra de espécimenes cadavéricos humanos. Materiais e métodos: se revisaram 50 encéfalos dos quais 24 cumpriram os critérios de inclusão; realizaram-se medidas de diâmetro e longitude, descreveram-se variações anatômicas e variações morfométricas. Resultados: o 29,1% dos espécimenes apresentaram variações anatómicas (n = 7 ), 3 (12,5%) apresentaram artéria cerebral anterior (ACA) ázigos, um (4,1%) apresentou dupla ACA no segmento A1, um (4,1%) apresentou triple ACA no segmento A2 e dupla artéria comunicante anterior (AcomA), um (4,1%) apresentou agenesia da artéria comunicante posterior (AComP) direita, um (4,1%) da AComP esquerda. 29,1% apresentaram variações antropométricas, três (12,5%) apresentaram hipoplasia de AComP direita, três (12,5%) da AComP esquerda e um (4,1%) hipoplasia bilateral da AComP. Conclusão: a presença de variações anatómicas foi inferior à reportada em outros estudos, com predomínio de variantes da circulação anterior, se descreve a presença de triple ACA no segmento A2 e dupla artéria comunicante anterior.

Investigation of the relationship between cerebral near-infrared spectroscopy measurements and cerebrovascular event in coronary artery bypass grafting operation in patients without carotid stenosis and patients with carotid stenosis below surgical margins

Abstract Objectives: Stroke is an important cause of mortality and morbidity in surgery. In the present study, we examined the cerebral oximetry values of patients with carotid artery stenosis who did not present surgical indications and those who did not present carotid artery stenosis in coronary artery bypass grafting (CABG) surgery by comparing their cerebral oximetry values with cerebrovascular disease (CVD). Methods: Between January and May 2014, 40 patients who underwent isolated CABG were included in the study. Cerebral oximetry probes were placed prior to induction of anesthesia. Cerebral oximetry values were recorded before induction, in the pump (cardiopulmonary bypass) inlet period, in the post-clamp period, in the pump outlet period, and in the intensive care unit and neurological complications. Results: There was no difference between the groups in terms of demographic data and routine follow-up parameters. Intraoperative surgical data and early postoperative results were similar in both groups. When comparing the groups, there were no statistically significant results in cerebral oximetry values and CVD development. Only one patient in group 2 had postoperative CVD and this patient was discharged from the hospital with right hemiplegia. Mean arterial pressure (MAP)levels were significantly higher in Group 2 (P<0.05). Conclusion: The follow-up of cerebral perfusion with a method like near-infrared spectroscopy (NIRS) will ensure that MAP is adjusted with interventions that will be made according to changes in NIRS. Thus, it will be possible to avoid unnecessary medication and flow-rate increase with cerebral oxygen saturation (rSO2) follow-up.

Repercusión neurológica por cambios en el flujo sanguíneo cerebral en neonatos sometidos a cirugía cardiovascular / Neurological repercussions of changes in cerebral blood flow in neonates undergoing cardiovascular surgery

Resumen Introducción: La cirugía de cardiopatías congénitas puede generar alteraciones perfusorias cerebrales con repercusión neurológica. Objetivo: Analizar la relación del índice de resistencia (IR) vascular cerebral periquirúrgico con funciones neurológicas mediatas posteriores a cirugía de cardiopatía congénita. Método: Estudio de cohorte prospectivo de 34 neonatos en quienes se determinó IR de la arteria basilar, niveles séricos de oxígeno, dióxido de carbono y lactato, antes y después de procedimientos paliativos o correctivos. Relacionamos el IR prequirúrgico con la capacidad posquirúrgica para iniciar la vía enteral o restablecer la respiración espontánea no asistida. Resultados: Se integraron tres grupos: 17 neonatos con IR alto > 0.73, cinco con IR normal de 0.63 a 0.73 y seis con IR bajo < 0.63. En los primeros persistió IR alto en el posquirúrgico, con hiperlactatemia e hipoxia persistentes; en 86 % no se logró iniciar la vía enteral ni retirar la ventilación asistida. En los segundos, el IR se mantuvo en valores normales. En los terceros, si bien el IR, el lactato sérico y la presión arterial de oxígeno tendieron a normalizarse, 71 % presentó daño neurológico grave. Conclusiones: Los cambios en el IR fueron frecuentes, aunque el daño neurológico parece presentarse más cuando el IR se mantiene alto, posiblemente asociado a flujos cerebrales bajos.

Abstract Introduction: Surgery for congenital heart disease can generate cerebral perfusion-associated alterations with neurological repercussions. Objective: To analyze the relationship of peri-surgical cerebrovascular resistance index (RI) with mediate neurological functions after congenital heart disease surgery. Method: Prospective cohort study of 34 neonates in whom basilar artery RI, serum oxygen, carbon dioxide and lactate levels were determined before and after palliative or corrective procedures. We related pre-surgical RI with post-surgical ability to initiate the enteral route or to restore unassisted spontaneous breathing. Results: Three groups were formed: 17 neonates with high RI (> 0.73), five with normal RI (0.63-0.73) and six with low RI (< 0.63). In the former group, high RI persisted in the postoperative period, with persistent hyperlactatemia and hypoxia; in 86%, the enteral route could not be initiated, and neither could assisted ventilation be withdrawn. In the second group, IR remained within normal values. In the third group, although RI, serum lactate and arterial oxygen pressure tended to normalize, 71% had severe neurological damage. Conclusions: RI changes were common, although neurological damage appears to occur more commonly when RI remains high, possibly associated with low cerebral blood flow.

Cirugía de hombro en posición silla de playa: estrategias y recomendaciones para la prevención de complicaciones isquémicas / Strategies and recommendations for the prevention of ischemic complications in beach chair position for shoulder surgery

Beach chair position is require for Shoulder surgery frequently for proper resolution. The stroke associated with shoulder surgery is a rare complication and probably underreported. The objective of this article is to review the pathophysiology of the ischemic damage associated with beach chair position, learn about strategies and develop recommendations to minimize risks.

La cirugía de hombro (CH), requiere y requerirá colocar a los pacientes en la posición en silla de playa (PSP), cada vez con mayor frecuencia para su adecuada resolución. El asociado a CH, es una complicación poco frecuente y probablmente subreportada. El objetivo de esta revisión, es repasar la fisiopatología del daño isquémico asociado a PSP, conocer estrategias y elaborar recomedaciones destinadas a minimizar riesgos.

¿La espectroscopia de infrarrojo cercano (NIRS) podría ser útil en el monitoreo hemodinámico del paciente critico pediátrico? / Near infrared spectroscopy (NIRS) can be useful in the hemodynamic monitoring of the pediatric critical patient?

Introducción: La oximetría cerebral no invasiva utiliza la tecnología NIRS ("near infrared spectroscopy") para medir la saturación de oxígeno en una pequeña región de los vasos cerebrales corticales. Refleja el 75% volumen de oxigenación cerebral venosa y el 25% volumen de oxigenación cerebral arterial. Objetivo: Hacer una descripción breve sobre oximetría cerebral no invasiva mediante la tecnología NIRS ("near infrared spectroscopy"). Aunque esta técnica se describió hace más de 25 años, su uso es cada vez más frecuente siendo un fenómeno reciente. Comentarios: La saturación regional cerebral de oxígeno (rSO2c), al igual que la saturación pulsátil arterial periférica de oxígeno, se mide por espectrometría. Se basa en el hecho de que la hemoglobina oxigenada absorbe menos luz roja y más luz infrarroja que la hemoglobina. Es un método sencillo para identificar el límite inferior de la autorregulación, el punto por debajo del cual el flujo sanguíneo cerebral y la oxigenación tisular se hacen dependientes de la presión. Conclusiones: Los valores obtenidos de rSO2c representan el estado de oxigenación de los cromóforos del lecho vascular cerebral del compartimento venoso. Los cambios en la oximetría cerebral dependen del balance entre aporte y consumo de oxígeno.

Introduction: Non-invasive cerebral oximetry uses NIRS ("near infrared spectroscopy") technology to measure oxygen saturation in a small region of cortical cerebral vessels. It reflects 75% volume of venous cerebral oxygenation and 25% volume of arterial cerebral oxygenation. Objective: To make a brief description about non-invasive cerebral oximetry using NIRS technology ("near infrared spectroscopy"). Although this technique was described more than 25 years ago, its use is increasingly frequent being a recent phenomenon. Comments: Regional cerebral oxygen saturation (rSO2c), like peripheral arterial pulsatile oxygen saturation, is measured by spectrometry. It is based on the fact that oxygenated hemoglobin absorbs less red light and more infrared light than hemoglobin. It is a simple method to identify the lower limit of self-regulation, the point below which cerebral blood flow and tissue oxygenation become pressure dependent. Conclusions: The values ​​obtained from rSO2c represent the oxygenation state of the chromophores of the cerebral vascular bed of the venous compartment. Changes in cerebral oximetry depend on the balance between oxygen intake and consumption.

Cerebral Autoregulation in Patients with Unilateral Carotid Artery Stenosis / 中国医学科学院学报

To investigate cerebral autoregulation(CA)in patients with severe unilateral carotid artery stenosis by near infrared spectroscopy. Thirty patients who underwent general anesthesia in our hospital from January 2015 to February 2017 were enrolled in this study.The stenosis group included 15 patients with severe unilateral internal carotid artery stenosis,and the control group included 15 patients without carotid artery stenosis.Both groups were matched in sex and age.Cerebral tissue oxygenation index(TOI)and mean arterial pressure were recorded continuously under stable general anesthesia.The Pearson correlation coefficient()was calculated to judge the CA status. TOI was not significantly different between the stenosis side and the non-stenosis side in the stenosis group(66.52±6.50 65.23±4.50;=0.93, =0.368)or between the stenosis side in the stenosis group and the stenosis side in the control group(66.52±6.50 64.22±3.87;=1.18, =0.248).The values of stenosis side and non-stenosis side in the stenosis group were 0.36±0.12 and 0.17±0.11,respectively,and the values of the stenosis side in the stenosis group and the stenosis side of the control group were 0.36±0.12 and 0.13±0.08,respectively.In the stenosis group,5 patients had transient ischemic attack and 2 patients had a history of stroke within 3 months before operation.When an value of 0.342 was used as the judgment point of CA abnormality,the sensitivity and specificity were 0.625 and 0.909,respectively. Within the range of normal blood pressure fluctuation,cerebral blood flow is linked to blood pressure at the stenosis side in patients with severe unilateral carotid artery stenosis.

Neurosífilis meningovascular como causa de accidente cerebrovascular en paciente joven: reporte de caso / Meningovascular neurosyphilis as a cause of stroke in a young patient: case report

Resumen El accidente cerebrovascular en adultos jóvenes es un evento raro presente en menos del 5% de los casos a nivel mundial, representando un reto diagnóstico debido a las múltiples etiologías posibles, entre ellas las infecciones. Del 15% al 40% de los pacientes con sífilis no tratada pueden desarrollar sífilis terciaria con manifestaciones principalmente neurodestructivas, descritas en la sífilis tardía pero con meningitis crónica y accidente cerebrovascular de tipo meningovascular en su fase temprana. Se presenta el caso de un paciente masculino de 40 años con antecedente de cambios de comportamiento, alucinaciones auditivas e insomnio, quien consulta a urgencias por presentar hemiplejia derecha, afasia motora, lesiones palmo-plantares y roseta en glande asociada a adenopatías inguinales. Dados los hallazgos imagenológicos y de líquido cefalorraquídeo se estableció diagnóstico de accidente cerebrovascular isquémico de circulación cerebral anterior izquierda secundario a neurosífilis meningovascular, con confirmación de inmunosupresión por virus de inmunodeficiencia humana. MÉD.UIS.2019;32(2):53-8

Abstract Stroke in young adults is a rare event present in less than 5% of cases worldwide, representing a diagnostic challenge due to the multiple possible etiologies, including infections. 15% to 40% of patients with untreated syphilis may develop tertiary syphilis; with mainly neurodestructive manifestations, described in late syphilis, but in its early stage with chronic meningitis and meningovascular stroke. The case of a 40-year-old male patient with a history of behavior changes, auditory hallucinations and insomnia is presented, who consults the emergency department for presenting right hemiplegia, motor aphasia, palmoplantar lesions and rosette in glans associated with inguinal adenopathies. Given the imaging and cerebrospinal fluid findings, a diagnosis of ischemic stroke of the left anterior cerebral circulation was established, secondary to meningovascular neurosyphilis, with confirmation of immunosuppression due to human immunodeficiency virus. MÉD.UIS.2019;32(2):53-8

Validación de la evaluación por ultrasonido de la vaina del nervio óptico para la cuantificación de la presión intracraneana en grandes altitudes / Validation of the ultrasound evaluation of the optic nerve sheath for the quantification of intracranial pressure at high altitudes

INTRODUCCIÓN. La medición del diámetro de la vaina del nervio óptico a través de la ventana ocular puede ser un método no invasivo para la detección de hipertensión endocraneana. OBJETIVO. De este trabajo fue validar una fórmula de cuantificación de la presión intracraneana a partir de la evaluación por ultrasonido de la vaina del nervio óptico en una ciudad de gran altitud. MATERIALES Y MÉTODOS. Estudio prospectivo de 27 pacientes con trauma craneoencefalico grave en quienes se les colocó un sensor de presión intracraneana intraventricular y se realizó el cálculo de la PIC no invasiva mediante correlación utilizando la evaluación de la vaina del nervio óptico a través de ultrasonido y aplicando una fórmula de cálculo. RESULTADOS. Correlación positiva débil con significancia estadística. CONCLUSIÓN. La cuantificación de la presión intracraneana no invasiva a través de la evaluación de la vaina del nervio óptico por ultrasonido podría ser una herramienta útil en ciudades de gran altitud sobre el nivel del mar.

INTRODUCTION. Measuring the diameter of the optic nerve sheath through the eye window can be a non-invasive method for the detection of endocranial hypertension. OBJECTIVE. This work was to validate a formula for quantifying intracranial pressure from the ultrasound evaluation of the optic nerve sheath in a high-altitude city. MATERIALS AND METHODS. Prospective study of 27 patients with severe cranioencephalic trauma in whom an intraventricular intracranial pressure sensor was placed and the calculation of non-invasive ICP was performed by correlation using the evaluation of the optic nerve sheath through ultrasound and applying a formula of calculation. RESULTS. Weak positive correlation with statistical significance. CONCLUSION. Quantification of non-invasive intracranial pressure through the evaluation of the optic nerve sheath by ultrasound could be a useful tool in high altitude cities above sea level.

Diagnóstico y tratamiento de la hipertensión intracraneal / Diagnosis and Treatment of Intracranial Hypertension

La presión intracraneal elevada es una complicación devastadora de la lesión neurológica, que puede complicar el trauma, los tumores del sistema nervioso central, la hidrocefalia, la encefalopatía hepática y el flujo venoso del SNC alterado. El adecuado tratamiento consta de un rápido reconocimiento, utilizar material de monitoreo neurológico invasivo y su manejo para reducir la hipertensión intracraneal y sus múltiples causas subyacente. A continuación presentamos una revisión de sus principales características y principios de abordaje diagnóstico-terapéutico

Intracranial pressure is a devastating complication of neurological damage, which can complicate trauma, central nervous system disorders, hydrocephalus, hepatic encephalopathy, and altered CNS venous flow. The appropriate treatment consists of a rapid recognition, the use of an invasive neurological system and its management to reduce intracranial hypertension and its multiple underlying causes. Below we present a review of its main characteristics and principles of diagnostic-therapeutic approach.

Cerebral blood flow measurements in patients with comorbid hypertension and depression using 3D arterial spin labeling / 北京大学学报(医学版)

OBJECTIVE@#To evaluate cerebral blood flow (CBF) in patients with comorbid hypertension in depression using 3D pseudocontinuous arterial spin labeling (3D pcASL) and to compare the differences of CBF values in depression, hypertension, and comorbid hypertension between depression and healthy control groups. To investigate the correlation between CBF values and degrees of depression.@*METHODS@#Sixteen patients with depression (depression group, 3 males and 13 females, age range of 42-72 years old), sixteen patients with hypertension (hypertension group, 3 males and 13 females, age range of 41-68 years old), sixteen patients with comorbid hypertension in depression (comorbidity group, 3 males and 13 females, age range of 45-74 years old), and sixteen healthy controls (control group, 3 males and 13 females, age range of 43-68 years old) were recruited. 3D pcASL sequence was performed by GE 3.0T magnetic resonance scanner and CBF map was generated automatically. Statistical parametric mapping (SPM8) was performed to preprocess the CBF map, which was spatially normalized and smoothed. Comparison of the CBF values among the four groups was conducted by ANOVA. Correlation between the average CBF values in areas of decreased CBF and Hamilton depression scale (HAMD-17) was investigated.@*RESULTS@#The patients with comorbid hypertension in depression demonstrated lower CBF in bilateral superior frontal gyri, middle frontal gyri, inferior frontal gyri, right superior parietal gyrus, right inferior parietal gyrus, right supramarginal gyrus, left caudate nucleus and left insula lobe in comparison with the controls. Compared with control group, CBF values decreased in bilateral frontal lobes, but did not reach statistical significance. There were no significant differences of CBF values between the patients with hypertension and control subjects. Compared with depression, the patients with comorbid hypertension in depression showed lower CBF values in bilateral frontal lobes and right supramarginal gyrus. Compared with hypertension, lower CBF values in left middle frontal gyrus in the patients with comorbid hypertension in depression were shown. Correlation analysis indicated that no correlation between CBF values and scores of HAMD-17 was shown.@*CONCLUSION@#Although there were no significant decreases of CBF values in patients with depression and hypertension, regional hypoperfusions were observed in patients with comorbid hypertension in depression. Hypertension might play a synergistic action on cerebral hypoperfusion in patients with comorbid hypertension in depression.

Diagnosis and treatment of adult Moyamoya disease

Moyamoya disease (MMD) refers to a chronic progressive steno-occlusive disease at the distal portion of the internal carotid artery with abnormal collateral vessel formation of unknown etiology. The definite diagnosis of MMD requires cerebral angiography or magnetic resonance angiography and/or magnetic resonance imaging after excluding other underlying diseases, particularly in adult patients. The treatment aims to improve regional cerebral blood flow to prevent cerebral ischemic events and alleviate hemodynamic instability that can provoke cerebral hemorrhage. Although various surgical revascularization methods have been introduced, combined revascularization surgery including direct revascularization is preferred over indirect revascularization only in adult MMD patients. Several recent studies have shown that surgical treatment has better outcomes and prognosis for symptomatic hemodynamically unstable MMD patients with both ischemic and hemorrhagic presentations. For asymptomatic patients, follow up with appropriate imaging is recommended. Surgery should be considered when new symptoms emerge with hemodynamic aggravation.

Collateral circulation and Toll-like receptor 4 levels in patients with acute cerebral infarction after intravenous thrombolysis / 南方医科大学学报

OBJECTIVE@#To investigate the relationship between Toll-like receptor 4 (TLR4) and collateral circulation in patients with acute cerebral infarction (AIS) after thrombolytic therapy.@*METHODS@#This retrospective, observational cohort study was conducted among 65 patients with AIS receiving thrombolytic therapy, who were divided according to findings by computed tomographic angiography (CTA) into good collateral circulation (group A, = 34) and poor collateral circulation (group B, = 31). Serum samples were collected from all the patients and the levels of TLR4 were measured with ELISA.@*RESULTS@#The patients in group A had significantly better outcomes than those in group B. The NIHSS scores at 24 h and 30 days after thrombolytic therapy, mRS scores at 90 days and serum TLR4 levels were significantly lower in group A than in group B ( < 0.05); the percentages of patients with symptomatic intracerebral hemorrhage were comparable between the two groups. The serum levels of TLR4 were negatively correlated with the rMLC score ( < 0.05). Multivariate logistic regression analysis showed that a high level of TLR4 was associated with a poor collateral circulation after thrombolysis.@*CONCLUSIONS@#Good collateral circulation can increase the benefit of intravenous thrombolysis in patients with ACI, and the level of TLR4 is a predictive factor for the compensation of collateral circulation following ACI.