A Survey of FDG- and Amyloid-PET Imaging in Dementia and GRADE Analysis

PET based tools can improve the early diagnosis of Alzheimer’s disease (AD) and differential diagnosis of dementia. The importance of identifying individuals at risk of developing dementia among people with subjective cognitive complaints or mild cognitive impairment has clinical, social, and therapeutic implications. Within the two major classes of AD biomarkers currently identified, that is, markers of pathology and neurodegeneration, amyloid- and FDG-PET imaging represent decisive tools for their measurement. As a consequence, the PET tools have been recognized to be of crucial value in the recent guidelines for the early diagnosis of AD and other dementia conditions. The references based recommendations, however, include large PET imaging literature based on visual methods that greatly reduces sensitivity and specificity and lacks a clear cut-off between normal and pathological findings. PET imaging can be assessed using parametric or voxel-wise analyses by comparing the subject’s scan with a normative data set, significantly increasing the diagnostic accuracy. This paper is a survey of the relevant literature on FDG and amyloid-PET imaging aimed at providing the value of quantification for the early and differential diagnosis of AD. This allowed a meta-analysis and GRADE analysis revealing high values for PET imaging that might be useful in considering recommendations

Do neurosurgeons follow the guidelines? a world-based survey on severe traumatic brain injury

ANTECEDENTES: La lesión cerebral traumática (LCT) será la tercera causa de muerte en todo el mundo, según la OMS. Dos encuestas europeas sugirieron que el cumplimiento de las directrices sobre traumatismos craneoencefálicos es deficiente. Ningún estudio ha comparado el cumplimiento entre países de ingresos bajos (LMIC) y países de ingresos altos (UHIC). Por lo tanto, este estudio tuvo como objetivo investigar las diferencias en el manejo de pacientes con TBI grave, comparando ingresos bajos y altos, y la adherencia a las pautas de BTF. MÉTODOS: se difundió una encuesta basada en la web a través de la fundación global Neuro, diferentes sociedades neuroquirúrgicas y las redes sociales. RESULTADOS: participaron un total de 803 neurocirujanos: 70,4 de UHIC y 29,6% de LMIC. El 73 % y el 65 % de los que respondieron en LMIC y UHIC, respectivamente (P = 0,016), administraron hipertónico como medida temprana. El 66 % y el 58 % de los neurocirujanos de los LMIC y los UHIC recomendaron una monitorización invasiva de la presión intracraneal, respectivamente (p<0,001). los fármacos anticonvulsivos (P<0,001) se administraron con mayor frecuencia en los LMIC que, en contra de las recomendaciones, los esteroides (87 % frente a 61 % y 86 % frente a 81 %, respectivamente). en los LMIC tanto la evacuación de la contusión como la craniectomía descompresiva se realizaron antes que en los UHIC (30 % frente a 17 % con P<0,001 y 44 % frente a 28 % con P=0,006, respectivamente). En los LMIC, el control de TC de la cabeza se realizó principalmente entre 12 y 24 horas desde la primera imagen (38 % frente a 23 %, P <0,001). CONCLUSIONES: Las Directrices actuales sobre TBI no siempre se ajustan tanto a los recursos como a las circunstancias de los diferentes países. La investigación futura y las guías de práctica clínica deberían reflejar la mayor relevancia de la LCT en entornos de bajos recursos.BACKGROUND: Traumatic brain injury (TBI) is going to be the third-leading cause of death worldwide, according to the WHO. Two european surveys suggested that adherence to brain trauma guidelines is poor. No study has compared compliance between low- (LMICs) and high-income (UHICs) countries. Hence, this study aimed to investigate differences in the management of severe TBI patients, comparing low- and high-income, and adherence to the BTF guidelines. METHODS: a web-based survey was spread through the global Neuro foundation, different neurosurgical societies, and social media. RESULTS: a total of 803 neurosurgeons participated: 70.4 from UHICs and 29.6% from LMICs. Hypertonic was administered as an early measure by the 73% and 65% of the responders in LMICs and UHICs, respectively (P=0.016). an invasive intracranial pressure monitoring was recommended by the 66% and 58% of the neurosurgeons in LMICs and UHICs, respectively (P<0.001). antiseizure drugs (P<0.001) were given most frequently in LMICs as, against recommendations, steroids (87% vs. 61% and 86% vs. 81%, respectively). in the LMICs both the evacuation of the contusion and decompressive craniectomy were performed earlier than in UHICs (30% vs. 17% with P<0.001 and 44% vs. 28% with P=0.006, respectively). In the LMICs, the head CT control was performed mostly between 12 and 24 hours from the first imaging (38% vs. 23%, P<0.001). CONCLUSIONS: The current Guidelines on TBI do not always fit to both the resources and circumstances in different countries. Future research and clinical practice guidelines should reflect the greater relevance of TBI in low resource settings

A survey of FDG- and amyloid-PET imaging in dementia and GRADE analysis

PET based tools can improve the early diagnosis of Alzheimer's disease (AD) and differential diagnosis of dementia. The importance of identifying individuals at risk of developing dementia among people with subjective cognitive complaints or mild cognitive impairment has clinical, social, and therapeutic implications. Within the two major classes of AD biomarkers currently identified, that is, markers of pathology and neurodegeneration, amyloid- and FDG-PET imaging represent decisive tools for their measurement. As a consequence, the PET tools have been recognized to be of crucial value in the recent guidelines for the early diagnosis of AD and other dementia conditions. The references based recommendations, however, include large PET imaging literature based on visual methods that greatly reduces sensitivity and specificity and lacks a clear cut-off between normal and pathological findings. PET imaging can be assessed using parametric or voxel-wise analyses by comparing the subject's scan with a normative data set, significantly increasing the diagnostic accuracy. This paper is a survey of the relevant literature on FDG and amyloid-PET imaging aimed at providing the value of quantification for the early and differential diagnosis of AD. This allowed a meta-analysis and GRADE analysis revealing high values for PET imaging that might be useful in considering recommendations