Daniela Seixas's research while affiliated with University of Coimbra and other places
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Publications (37)
Background:
Developing technologies in real-time continuous glucose monitoring (CGM) are successfully reducing severe hypoglycaemia (SH) in trials and clinical practice. Their impact on impaired awareness of hypoglycaemia (IAH), a major risk factor for SH, is uncertain.
Methods:
The present study examined two scales for assessing hypoglycaemia a...
Introduction: Magnetic resonance imaging is recognized as the most important diagnostic test in the diagnosis of multiple sclerosis, differential diagnosis and evaluation of progression/therapeutic response. However, to make optimal use of magnetic resonance imaging in multiple sclerosis, the use of a standard, reproducible and comparable imaging p...
Resting‐state functional magnetic resonance imaging (rsfMRI) is a promising technique for language mapping that does not require task‐execution. This can be an advantage when language mapping is limited by poor task performance, as is common in clinical settings. Previous studies have shown that language maps extracted with rsfMRI spatially match t...
In this chapter, we address a frequent and debilitating symptom—pain of one of the most common causes of neurological disability in the young adult: multiple sclerosis. We introduce multiple sclerosis and define the role of neuroimaging in the diagnosis of the disease and beyond. Pain syndromes in multiple sclerosis are described, as well as other...
Aim: There is evidence that adolescents with distinct rhythms of pubertal maturation have different psychosocial behaviours. However, a relation between pubertal maturation and the development of the prefrontal cortex and limbic system was not yet established. The aim of this study was to apply brain magnetic resonance imaging to investigate brain...
Resting-state fMRI is a well-suited technique to map functional networks in the brain because unlike task-based approaches it requires little collaboration from subjects. This is especially relevant in clinical settings where a number of subjects cannot comply with task demands. Previous studies using conventional scanner fields have shown that res...
Objectives:
To characterize cognitive impairment in primary progressive multiple sclerosis (PPMS) and to correlate the pattern of cognitive deficits with brain magnetic resonance imaging (MRI) volumetric data.
Materials and methods:
In a multicenter cross-sectional study, we recruited consecutive patients with PPMS as well as age, sex, and educa...
Pain commonly affects multiple sclerosis (MS) patients, and has the potential to become chronic and burden an already damaged central nervous system. Imaging studies are providing insights into brain restructuring associated with chronic pain and different chronic pain conditions seem to evoke distinct plasticity patterns. Our objective was to stud...
Purpose
This paper aims to explore brain-based differences in national and own-label brands perceptions. Because price is a differentiating characteristic, able to discriminate between national and own-label brands, its influence is also studied.
Design/methodology/approach
The study uses the Save Holdings Or Purchase (SHOP) task with functional m...
Functional magnetic resonance imaging, fMRI, is a well-known non-invasive technique for the study of brain function. One of its most common clinical applications is preoperative language mapping, essential for the preservation of function in neurosurgical patients. Typically, fMRI is used to track task-related activity, but poor task performance an...
Introduction
While pain in multiple sclerosis (MS) is common, in many cases the precise mechanisms are unclear. Neuroimaging studies could have a valuable role in investigating the aetiology of pain syndromes. The aim of this review was to synthesise and appraise the current literature on neuroimaging studies of pain syndromes in MS.
Methods
We sy...
Magnetic resonance imaging (MRI) has rapidly become an essential diagnostic tool in modern medicine. Understanding the objectives, perception and expectations of the different medical specialties towards MRI is therefore important to improve the quality of the examinations. Our aim was to better comprehend the reasons and expectations of neurologis...
The facial nerve is the third most frequent location of intracranial schwannomas, with facial paresis the most common sign.(1,2) A 77-year-old woman presented with amnesia; the Mini-Mental State Examination score was 26, with normal cranial nerve function. A giant multicystic VII nerve schwannoma was identified in the left middle fossa, with compon...
To compare T1-weighted (W) fat-water separation (Dixon's technique) with T1W fat-saturation (FS) and T2W Dixon with short-tau inversion recovery (STIR) images for fat suppression in a short-bore MRI machine.
Thirteen patients with lumbar disease were studied on using 1.5 T MRI machine. The protocol included T1 FS (with contrast medium administratio...
Fabry disease (FD) is caused by progressive accumulation of neutral glycosphingolipids, including in ganglion neural and vascular endothelial cells, as a result of lysosomal α-galactosidase deficiency. High frequencies progressive sensorineural hearing loss (HL), sudden deafness, tinnitus and dizziness are otological symptoms frequently reported.
A...
Although the use of neuroscientific knowledge to investigate marketing issues has been widely discussed, to date, few empirical studies have been published. This study is a first approach in the development of a theory of the perception of brands, which is based on neuroscience. In a Functional Magnetic Resonance Imaging experiment, we stimulated p...
Cerebrovascular disease may progress asymptomatically in the early stages of Fabry disease (FD). Our aim was to test whether functional transcranial Doppler (fTCD) could provide useful data in the evaluation of these presymptomatic FD patients.
A cohort of 12 adult FD patients from families with the classical phenotype of the disease was evaluated...
Brands are believed to embody emotional, social relevant and self-related content. In this experiment functional magnetic resonance imaging (fMRI) was used to explore the neural correlates of brands’ perception. A common network of brain areas involved in the assessment of brands was found, and brain structures that activated significantly more wit...
The ventromedial prefrontal cortex (vmPFC) is believed to be important in everyday preference judgments, processing emotions during decision-making. However, there is still controversy in the literature regarding the participation of the vmPFC. To further elucidate the contribution of the vmPFC in brand preference, we designed a functional magnetic...
Early reports often ignored pain as an important symptom in multiple sclerosis (MS). Pain prevalence figures in MS from European countries other than Portugal range between 40 and 65%. To our knowledge there is no published data in English on pain in MS in Portugal. We describe the demographic and clinical characteristics, with an emphasis on pain,...
Multiple sclerosis (MS) is a frequent neurological disease, with an estimated prevalence in Portugal of 60/100.000. It is a disease of the young adult, whose first symptoms are commonly of sensory type. The pathological process is of inflammatory nature, involving the central nervous system. The typical histopathological lesion is an area of demyel...
We report here on a case of disseminated aspergillosis in an immunocompromised patient with Wegener's granulomatosis to illustrate the complexity of brain imaging diagnosis in the presence of concomitant infectious, immunological and ischemic diseases.
Functional magnetic resonance imaging (fMRI) has surfaced as a powerful method to study brain function in humans. While the involvement of neuroradiologists in fMRI studies in the clinical setting is obvious, in neuroscience research most of the investigators are not specialists trained in reading brain images. Advances in neuroimaging are increasi...
Commercial brands are believed to embody emotional content. In Marketing, there is a vast literature focusing on how to extract the eventual emotional content. Although, we relied on the emotional system proposed by Damasio and used an fMRI paradigm to explore the neural correlates of brands’ perceiving. We found a complex and extended general syst...
The CT and MR imaging findings in a case of unilateral agenesis of the internal carotid artery and hypogenesis of the pituitary gland are described in a child with congenital hypopituitarism. The embryological pathogenesis is discussed.
Orbital vascular lesions represent an important group of orbital pathology, because of their high prevalence, particularly in the pediatric population. They are also the most controversial group of lesions, due to the polemics in regard to their nature. Based on cases of their experience, the authors analyze the orbital vascular pathology, especial...
Citations
... For example, the Clarke score relies on experiences with severe hypoglycemia for scoring and IAH classification. 20 However, experiences with severe hypoglycemia may not be a good predictor of IAH given the widespread use of CGM, which reduces severe hypoglycemia events in individuals with IAH despite residual defects in glucose counterregulation. 21 Indeed, as reported by Sepúlveda et al, 20 with the increasing use of CGM technologies containing predictive and threshold alerts and alarms for detecting hypoglycemia, the Clarke score may not distinguish "technologic awareness" from "endogenous awareness" of hypoglycemia. ...
... 17 Harmonization initiatives have provided consensus reports for MRI in MS, moving toward standardization and dissemination of protocols that facilitate clinical translation and comparison of data across sites. [18][19][20][21][22] T 2 -weighted imaging is well established and frequently used for identification of white matter (WM) lesions, which have a hyperintense appearance. 5,23 Although being an important diagnostic criterion for MS, 24 the WM lesion load correlates only weakly with clinical disability because of its lack of specificity for lesion severity and the underlying pathophysiology. ...
... Accordingly, task based or resting-state functional studies have been performed to examine language and auditory sub-regions and their inter connections with other functional circuits (16)(17)(18)(19). The relation between functional connectivity (FC) and language (20,21) and auditory (22)(23)(24)(25) performance has been demonstrated using resting-state fMRI (rs-fMRI). Xiang et al. (26) showed that the topology of FC in 6 frontal sub-regions of perisylvian language network during rest, is consistent with the topology of language network of the brain. ...
... Additionally, due to the higher SNR, the temporal reliability of mapping is also improved, lending the technique a broader clinical range. For example, RS-fMRI at 7 T has been shown to enhance the temporal reliability of sensorimotor and language network detection in preoperative planning [45] and for mapping habenula restingstate networks involved in anxiety and addiction disorders [46]. ...
... Memory and executive function deficits seem to be more frequent as long as the disease progresses, although information processing speed tends to appear early and progress slowly (Brochet and Ruet, 2019). There is a higher prevalence of cognitive impairment in progressive forms of MS than in relapsing forms, consistent with pathological findings that highlight the major involvement of the gray matter in these phenotypes (Gouveia et al., 2017). ...
... The group of basal nuclei has certain functional features: The caudate nucleus is involved in the development of behavioral reactions, both as a part of the reward system and attention holding mechanism. Functional and structural disorders were described in the caudate and accessory nuclei in patients with multiple sclerosis and chronic pain syndrome (Seixas et al., 2016). These structures form close connections with the prefrontal cortex and participate in the development of behavioral reactions, planning of cognitive and motor acts, supporting the decision-making system (O'Doherty, 2004). ...
... Private label purchasers prioritized cheap pricing during purchase, while value-conscious shoppers preferred lower-priced options (Palazon and Delgado, 2009;Diallo and Siqueira, 2017;Steenkamp et al., 2010;Cho et al., 2015). As per Santos et al., (2016) cheap PLBs were more persuasive than expensive national brands. Price consciousness (PC) was linked to price sensitivity and affordability. ...
... Recent results have highlighted the importance of white matter structural disconnections in the disruption of functional connectivity 53 , and this disruption has been linked to behavioural and cognitive dysfunction 54,55 . Therefore, being able to identify these RSN white matter "highways" would propel our understanding of disconnection symptoms, improve recovery prognostics, and inform preoperative brain surgery planning 56 . To facilitate these efforts, we released the WhiteRest tool (as a module of the Functionnectome) that quantifies the presence of RSNs in a specific region of the brain's white matter. ...
... In this respect, neuropathic pain, which usually manifests as electric shocks, unpleasant perception of intense cold, and feelings of pressure or constriction, can occur at almost any site; it is generally chronic and, as such, can be extremely disabling. 3 Pain is one of the most common complaints of persons with multiple sclerosis (PwMS), 4 an autoimmune disease characterised by inflammation, selective demyelination and gliosis of central nervous system white matter. In particular, PwMS patients describe their pain as often widespread, chronic STRENGTHS AND LIMITATIONS OF THIS STUDY ⇒ Our novel study design will allow the characterisation of the physiological response to pain and its exploitation to assess the pain experience objectively. ...
... e most significant deficit in neurosurgical care exists in Southeast Asia, where nearly 2.5 million cases go undiagnosed. [2,4] In West Africa, just 84 MRI units serve a combined population of more than 300 million people. [11] Lack of equipment, such as an MRI machine, contributes to the inadequacy of diagnosis and essential neurosurgical care, which is why neurosurgical care in LMICs remains a luxury. ...