87 research outputs found
Pacemaker Currents in Dopaminergic Neurones of the Mice Olfactory Bulb
In the olfactory bulb (OB) dopaminergic (DA) neurones constitute a fraction of the cells occupying the most external (glomerular) layer (HalĂĄsz et al.1977). In this region, populated by three types of interneurons, periglomerular (PG) cells, short-axon cells and external tufted (ET) cells (HalĂĄsz1990) - often collectively referred to as juxtaglomerular cells - an estimated 10% of the neurones in adulthood are positive for tyrosine hydroxylase (TH) (McLean and Shipley1988; Kratskin and Belluzzi2003), the rate limiting enzyme for dopamine synthesis. Dopaminergic neurones in the glomerular layer include PG cells (Gall et al.1987; Kosaka et al.1985) and a fraction of ET cells (HalĂĄsz1990). Several studies have focused on the role of dopamine in the olfactory bulb, using immunohistochemical (Baker et al.1983; Guthrie et al.1991), behavioral (Doty and Risser1989), and electrophysiological techniques (Nowycky et al.1983; Ennis et al.2001; Davila et al.2003). The more complete description of the functional properties of DA neurons in the OB is probably the paper of Pignatelli (Pignatelli et al.2005), but it was incomplete, as it did not consider the contribution of the inward rectifier currents, a lacuna which is filled in the present work.
A property shared by many DA neurons in the CNS is their capacity to generate rhythmic action potentials even in the absence of synaptic inputs (Grace and Onn1989; Hainsworth et al.1991; Yung et al.1991; Feigenspan et al.1998; Neuhoff et al.2002). In this paper we show for the first time that DA cells in the glomerular layer of the olfactory bulb possess a pacemaker activity, and we provide an explanation for the ionic basis of rhythm generation in these cells.
There is an additional reason to study the functional properties of DA neurones in the OB other than their role in olfaction. The olfactory bulb is one of the rare regions of the mammalian CNS in which new cells, derived from stem cells in the anterior subventricular zone, are also added in adulthood (Gross2000). In the OB, these cells differentiate in interneurones in the granular and glomerular layers. Among these cells there are DA neurones (Betarbet et al.1996; Baker et al.2001), and this has raised a remarkable interest because, for their accessibility, they could provide a convenient source of autologous DA neurons for transplant therapies in neurodegenerative diseases, like Parkinsonâs disease
Non-alcoholic fatty liver disease (NAFLD), metabolic syndrome and cardiovascular events in atrial fibrillation. a prospective multicenter cohort study
Whether non-alcoholic fatty liver disease (NAFLD) is associated with an increased risk of cardiovascular events (CVEs) independently from metabolic syndrome (MetS) is still matter of debate. Aim of the study was to investigate the risk of CVEs in a high-risk population of patients with non-valvular atrial fibrillation (AF) according to the presence of MetS and NAFLD. Prospective observational multicenter study including 1,735 patients with non-valvular AF treated with vitamin K antagonists (VKAs) or direct oral anticoagulants (DOACs). NAFLD was defined by a fatty liver indexâ„60. We categorized patients in 4 groups: 0=neither MetS or NAFLD (38.6%), 1=NAFLD alone (12.4%), 2=MetS alone (19.3%), 3=both MetS and NAFLD (29.7%). Primary endpoint was a composite of CVEs. Mean age was 75.4±9.4years, and 41.4% of patients were women. During a mean follow-up of 34.1±22.8months (4,926.8 patient-years), 155 CVEs were recorded (incidence rate of 3.1%/year): 55 occurred in Group 0 (2.92%/year), 12 in Group 1 (2.17%/year), 45 in Group 2 (4.58%/year) and 43 in Group 3 (2.85%/year). Multivariable Cox regression analysis showed that use of DOACs, and female sex were inversely associated with CVEs, whilst age, heart failure, previous cardiac and cerebrovascular events, and group 2 (Group 2, Hazard Ratio 1.517, 95% Confidence Interval, 1.010-2.280) were directly associated with CVEs. In patients with AF, MetS increases the risk of CVEs. Patients with NAFLD alone have lower cardiovascular risk but may experience higher liver-related complications
How Prosecutors and Defense Attorneys Differ in Their Use of Neuroscience Evidence
Much of the public debate surrounding the intersection of neuroscience and criminal law is based on assumptions about how prosecutors and defense attorneys differ in their use of neuroscience evidence. For example, according to some commentators, the defenseâs use of neuroscience evidence will abdicate criminals of all responsibility for their offenses. In contrast, the prosecutionâs use of that same evidence will unfairly punish the most vulnerable defendants as unfixable future dangers to society. This âdouble- edged swordâ view of neuroscience evidence is important for flagging concerns about the lawâs construction of criminal responsibility and punishment: it demonstrates that the same information about the defendant can either be mitigating or aggravating depending on who is raising it. Yet empirical assessments of legal decisions reveal a far more nuanced reality, showing that public beliefs about the impact of neuroscience on the criminal law can often be wrong. This Article takes an evidence-based and multidisciplinary approach to examining how courts respond to neuroscience evidence in capital cases when the defense presents it to argue that the defendantâs mental state at the time of the crime was below the given legal requisite due to some neurologic or cognitive deficiency
Family History of Atrial Fibrillation and Risk of Cardiovascular Events A Multicenter Prospective Cohort Study
Aspirin and renal insufficiency progression in patients with atrial fibrillation and chronic kidney disease
Treatment Decision-Making of Secondary Prevention After Venous Thromboembolism: Data From the Real-Life START2-POST-VTE Register
Patients with venous thromboembolism (VTE) should receive a decision on the duration of anticoagulant treatment (AT) that is often not easy to make. Sixteen Italian clinical centers included patients with recent VTE in the START2-POST-VTE register and reported the decisions taken on duration of AT in each patient and the reasons for them. At the moment of this report, 472 (66.9%) of the 705 patients included in the registry were told to stop AT in 59.3% and to extend it in 40.7% of patients. Anticoagulant treatment lasted 653 months in >90% of patients and was extended in patients with proximal deep vein thrombosis because considered at high risk of recurrence or had thrombophilic abnormalities. d-dimer testing, assessment of residual thrombus, and patient preference were also indicated among the criteria influencing the decision. In conclusion, Italian doctors stuck to the minimum 3 months AT after VTE, while the secondary or unprovoked nature of the event was not seen as the prevalent factor influencing AT duration which instead was the result of a complex and multifactorial evaluation of each patient
Correlation between olfactory function, age, sex, and cognitive reserve index in the Italian population
Purpose: Loss of smell decreases the quality of life and contributes to the failure in recognizing hazardous substances. Given the relevance of olfaction in daily life, it is important to recognize an undiagnosed olfactory dysfunction to prevent these possible complications. Up to now, the prevalence of smell disorders in Italy is unknown due to a lack of epidemiological studies. Hence, the primary aim of this study was to evaluate the prevalence of olfactory dysfunction in a sample of Italian adults. Methods: Six hundred and thirty-three participants (347 woman and 286 men; mean age 44.9 years, SD 17.3, age range 18-86) were recruited from 10 distinct Italian regions. Participants were recruited using a convenience sapling and were divided into six different age groups: 18-29 years (N = 157), 30-39 years (N = 129), 40-49 years (N = 99), 50-59 years (N = 106), > 60 years (N = 142). Olfactory function, cognitive abilities, cognitive reserve, and depression were assessed, respectively, with: Sniffin' Sticks 16-item Odor Identification Test, Montreal Cognitive Assessment, Cognitive Reserve Index, and the Beck Depression Inventory. Additionally, socio-demographic data, medical history, and health-related lifestyle information were collected. Results: About 27% of participants showed an odor identification score < 12 indicating hyposmia. Multiple regression analysis revealed that OI was significantly correlated with age, sex, and cognitive reserve index, and young women with high cognitive reserve index showing the highest olfactory scores. Conclusion: This study provides data on the prevalence of olfactory dysfunction in different Italian regions
Nitrated Fibrinogen is A Biomarker of Oxidative Stress in Venous Thromboembolism
The pathogenesis of venous thromboembolism (VTE) is linked to inflammation and oxidant production, although specific markers for these pathways with pathological relevance to VTE have not been explored. The coagulant protein fibrinogen is posttranslationally modified by nitric oxide-derived oxidants to nitrated fibrinogen in both acute and chronic inflammatory states. Therefore, nitrated fibrinogen may serve as a marker of inflammation and oxidative stress in VTE. To test this hypothesis we enrolled subjects (n=251) presenting with suspected VTE at the University of Pennsylvania Hospital emergency department, 50 (19.9%) of whom were positive by imaging or 90-day follow-up. Mean nitrated fibrinogen was elevated in VTE-positive (62.7 nM, 95% CI 56.6â68.8) compared to VTE-negative patients (54.2 nM, 95% CI 51.4â57.1; P\u3c0.01). Patients in the highest quartile of nitrated fibrinogen had an increased risk of VTE compared with patients in the lowest quartile (OR 3.30; 95% CI 1.25â8.68; P\u3c0.05). This risk persisted after univariate adjustment for age, active cancer, and recent surgery, but not after multivariate adjustment. Mean fibrinogen levels measured either by the Clauss assay or by ELISA were not different between VTE-negative and VTE-positive patients. These data indicate that nitrated fibrinogen is an oxidative risk marker in VTE, providing a novel mechanistic link between oxidant production, inflammation, and VTE
Relationship between low Ankle-Brachial Index and rapid renal function decline in patients with atrial fibrillation: A prospective multicentre cohort study
OBJECTIVE: To investigate the relationship between Ankle-Brachial Index (ABI) and renal function progression in patients with atrial fibrillation (AF).
DESIGN: Observational prospective multicentre cohort study.
SETTING:Atherothrombosis Center of I Clinica Medica of 'Sapienza' University of Rome; Department of Medical and Surgical Sciences of University Magna GrĂŠcia of Catanzaro; Atrial Fibrillation Registry for Ankle-Brachial Index Prevalence Assessment-Collaborative Italian Study.
PARTICIPANTS: 897 AF patients on treatment with vitamin K antagonists.
MAIN OUTCOME MEASURES: The relationship between basal ABI and renal function progression, assessed by the estimated Glomerular Filtration Rate (eGFR) calculated with the CKD-EPI formula at baseline and after 2â
years of follow-up. The rapid decline in eGFR, defined as a decline in eGFR >5â
mL/min/1.73â
m(2)/year, and incident eGFR<60â
mL/min/1.73â
m(2) were primary and secondary end points, respectively.
RESULTS: Mean age was 71.8±9.0â
years and 41.8% were women. Low ABI (ie, â€0.90) was present in 194 (21.6%) patients. Baseline median eGFR was 72.7â
mL/min/1.73â
m(2), and 28.7% patients had an eGFR60â
mL/min/1.73â
m(2), 153 (23.9%) had a reduction of the eGFR <60â
mL/min/1.73â
m(2). ABI â€0.90 was also an independent predictor for incident eGFR<60â
mL/min/1.73â
m(2) (HR 1.851, 95% CI 1.205 to 2.845, p=0.005).
CONCLUSIONS: In patients with AF, an ABI â€0.90 is independently associated with a rapid decline in renal function and incident eGFR<60â
mL/min/1.73â
m(2). ABI measurement may help identify patients with AF at risk of renal function deterioration
Burnout among surgeons before and during the SARS-CoV-2 pandemic: an international survey
Background: SARS-CoV-2 pandemic has had many significant impacts within the surgical realm, and surgeons have been obligated to reconsider almost every aspect of daily clinical practice. Methods: This is a cross-sectional study reported in compliance with the CHERRIES guidelines and conducted through an online platform from June 14th to July 15th, 2020. The primary outcome was the burden of burnout during the pandemic indicated by the validated Shirom-Melamed Burnout Measure. Results: Nine hundred fifty-four surgeons completed the survey. The median length of practice was 10 years; 78.2% included were male with a median age of 37 years old, 39.5% were consultants, 68.9% were general surgeons, and 55.7% were affiliated with an academic institution. Overall, there was a significant increase in the mean burnout score during the pandemic; longer years of practice and older age were significantly associated with less burnout. There were significant reductions in the median number of outpatient visits, operated cases, on-call hours, emergency visits, and research work, so, 48.2% of respondents felt that the training resources were insufficient. The majority (81.3%) of respondents reported that their hospitals were included in the management of COVID-19, 66.5% felt their roles had been minimized; 41% were asked to assist in non-surgical medical practices, and 37.6% of respondents were included in COVID-19 management. Conclusions: There was a significant burnout among trainees. Almost all aspects of clinical and research activities were affected with a significant reduction in the volume of research, outpatient clinic visits, surgical procedures, on-call hours, and emergency cases hindering the training. Trial registration: The study was registered on clicaltrials.gov "NCT04433286" on 16/06/2020
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