Publications by authors named "Ian Ramsay"

Objective: Xanomeline and trospium chloride (formerly known as KarXT), a novel M/M muscarinic receptor agonist, demonstrated efficacy across phase 2 and 3 trials as monotherapy for the treatment of inpatients with acute schizophrenia on the Positive and Negative Syndrome Scale total score primary endpoint. In the phase 2 trial, xanomeline/trospium improved performance on a cognitive outcome measure in the subgroup of participants with clinically significant baseline cognitive impairment. The authors sought to confirm this finding using data from two phase 3 trials.

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  • * A multicenter analysis involved 269 patients, reporting a high success rate (100% effective distal penetration), a low complication rate (2.2%), and significant improvements in cSDH diameter and neurological function at 60-day follow-up.
  • * The findings suggest that using MMA embolization with the n-BCA D5W push technique is a safe and viable option alongside or instead of traditional surgery, showing a reduction in recurrence
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Background: Recent interest in how neural oscillations reflect the flow of information through the brain has led to partitioning electroencephalography (EEG) recordings into periodic (i.e., oscillatory) and aperiodic (i.

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  • This study used machine learning to classify subtypes of schizophrenia by analyzing brain images from over 4,000 patients and healthy individuals through international collaboration.* -
  • Researchers identified two neurostructural subgroups: one with predominant cortical loss and enlarged striatum, and another with significant subcortical loss in areas like the hippocampus and striatum.* -
  • The findings suggest this new imaging-based classification could redefine schizophrenia based on biological similarities, enhancing our understanding and treatment of the disorder.*
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  • This study is the first to evaluate the safety and effectiveness of a large bore access catheter (0.081″) in neurovascular interventions across multiple centers in the U.S.
  • Data was collected from 90 patients, revealing a high technical success rate of 98.9% for procedures involving aneurysm embolization, carotid stenting, and arteriovenous malformation embolization, primarily using the transradial approach.
  • The findings indicate that the large bore catheter is safe and effective, with no access site complications and only minimal unrelated postprocedural complications.
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  • Formal thought disorder (FTD) is a key symptom of schizophrenia, but its exact neurobiological causes and correlation with brain volume loss are still unclear, which this study seeks to address using a large cohort of patients and controls.
  • The research focuses on differentiating between positive, negative, and total formal thought disorder while investigating brain structural changes and their cellular bases using virtual histology tools.
  • Findings reveal distinct neural networks for positive and negative FTD, with negative FTD showing preserved orbitofrontal thickness and both FTD types linked to unique cellular fingerprint patterns, advancing our understanding of the disorder.
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The Brisbane River estuary is an anthropogenically-impacted waterway in southeast Queensland, Australia. The estuary is over 80 km long and flows through an urbanised region. It receives over 500 t per year of total nitrogen (N) from direct point-source discharges in addition to sporadic flood loads of N from an agriculturally impacted upper catchment.

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Objective: As the coronavirus disease 2019 (COVID-19) pandemic spread to the United States in 2020, there was an impetus toward postponing or ceasing nonurgent transsphenoidal pituitary surgeries to prevent the spread of the virus. Some centers encouraged transcranial approaches for patients with declining neurologic function. However, no large-scale data exist evaluating the effects that this situation had on national pituitary practice patterns.

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Background: Craniopharyngiomas are benign tumors of the anterior skull base arising from epithelial remnants of Rathke pouch. They mainly occur in the suprasellar space, can be incredibly debilitating, and remain difficult to resect as they frequently involve critical neurovascular structures. Although it is embryologically possible for craniopharyngiomas to arise extracranially along the entire migrational path of Rathke pouch, these remain exceedingly rare, especially among adults, and can be mistaken for nasopharyngeal cancer.

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Background: Giant falcine meningiomas are surgically complex as they are deep in location, concealed by normal brain parenchyma, in close proximity to various neurovascular structures, and frequently involve the falx bilaterally. Although classically accessed using a bifrontal craniotomy and interhemispheric approach, little data exist on alternative operative corridors for these challenging tumors. We evaluated perioperative and long-term outcomes in patients undergoing transcortical resection of giant bilateral falcine meningiomas.

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  • Schizophrenia is characterized by significant changes in brain structure, but it's not clear if these changes relate to the brain's network organization.
  • Researchers analyzed MRI scans from nearly 2,500 people with schizophrenia alongside healthy controls to see how structural changes connect to brain networks.
  • The study found that certain regions in the brain that are crucial for connectivity are more affected in schizophrenia, indicating a link between brain network vulnerability and the disease's impact, with some similarities to bipolar disorder but not major depressive disorder.
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Background: Distal cervical internal carotid artery (cICA) pseudoaneurysms are uncommon. They may lead to thromboembolic or hemorrhagic complications, especially in young adults. We report one of the first cases in the literature regarding the management via PK Papyrus (Biotronik, Lake Oswego, Oregon, USA) balloon-mounted covered stent of a 23-year-old male with an enlarging cervical carotid artery pseudoaneurysm and progressive internal carotid artery stenosis.

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Transvenous access is a necessary tool for numerous cerebrovascular pathologies.Transvenous access in the arm offers several benefits compared with transfemoral access, including patient comfort, the avoidance of transfemoral access complications, and the ability to close both radial arterial access and distal arm venous access with a single transradial compression band.1In this video we describe the indications, technical nuances, benefits, and limitations of transvenous access in the arm.

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  • Transcarotid artery revascularization (TCAR) is a newer, less invasive treatment for carotid stenosis that shows promising outcomes compared to traditional options like carotid endarterectomy (CEA) and carotid artery stenting (CAS).
  • In a study analyzing data from 2015 to 2019, TCAR utilization increased but was still low, and its rates of death, stroke, and heart attack were found to be favorable compared to CEA and CAS.
  • The findings suggest that TCAR is underutilized and may be a better option for patients who are not suitable for surgery or prefer a less invasive procedure.
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Background: Impairments in cognition and motivation are core features of psychosis and strong predictors of social and occupational functioning. Accumulating evidence indicates that cognitive deficits in psychosis can be improved by computer-based cognitive training programs; however, barriers include access and adherence to cognitive training exercises. Limited evidence-based methods have been established to enhance motivated behavior.

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Machine learning can be used to define subtypes of psychiatric conditions based on shared clinical and biological foundations, presenting a crucial step toward establishing biologically based subtypes of mental disorders. With the goal of identifying subtypes of disease progression in schizophrenia, here we analyzed cross-sectional brain structural magnetic resonance imaging (MRI) data from 4,291 individuals with schizophrenia (1,709 females, age=32.5 years±11.

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  • A study investigates the connection between formal thought disorder (FTD) symptoms in schizophrenia and brain volume deficiencies, using data from 752 individuals with schizophrenia and 1256 controls.
  • The research identifies separate neural networks associated with positive and negative FTD, revealing differences in brain structures affected by each type of symptom.
  • Findings show that negative FTD is linked to specific neuronal and astrocyte cell types, while positive FTD is associated with microglial cells, enhancing understanding of the biological mechanisms behind these symptoms.
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Background: Neurological complications of bacterial endocarditis (BE) are common, including acute ischemic stroke (AIS). Although mechanical thrombectomy (MT) is effective for large vessel occlusion (LVO) stroke, data are limited on MT for LVOs in patients with endocarditis. We assess outcomes in patients treated with thrombectomy for LVOs with concurrent BE.

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Background: There has been a recent decrease in interventional management of cerebral arteriovenous malformations (AVMs). The objective of our study was to evaluate the changing patterns in management of AVMs in the first year of the COVID-19 pandemic.

Methods: The National Inpatient Sample (NIS) database was used.

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Background: Intracranial dural arteriovenous fistulas (DAVFs) have been documented to occasionally spontaneously regress. However, the mechanism responsible for this occurrence remains speculative.

Methods: We present a case of a Borden II - Cognard IIa+b DAVF involving the superior sagittal sinus (SSS) with bilateral external carotid artery supply that regressed spontaneously.

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Background: Orbital varices are rare, accounting for only 0-1.3% of orbital masses. They can be found incidentally or cause mild to serious sequelae, including hemorrhage and optic nerve compression.

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  • Formal thought disorder (FTD) significantly impacts schizophrenia, yet its neurobiological causes, particularly the connection between FTD symptoms and brain volume changes, are largely unexplored.
  • This study, involving a large cohort of 752 individuals with schizophrenia and 1256 controls, aims to clarify the neuroanatomical aspects of positive and negative FTD and their cellular foundations using advanced virtual histology techniques.
  • Results revealed two distinct neural networks for FTD: one linked to negative symptoms, with preserved orbitofrontal thickness, and another for positive symptoms, affecting lateral temporal areas; each network had unique cellular signatures, highlighting different underlying mechanisms for these psychotic symptoms.
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  • Some studies show that people who have a type of stroke called LVO and also have COVID-19 don't do as well as those without the virus.
  • Researchers looked at data from 2020 and found that younger patients with COVID-19 had a higher chance of dying and stayed in the hospital longer.
  • Patients with COVID-19 also faced more serious health problems like breathing issues and complications related to their heart, but did not have a higher risk of having another stroke.
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The Ga-Collagen Binding Probe #8, Ga-CBP8, is a peptide-based, type I collagen-targeted probe developed for imaging of tissue fibrosis. The aim of this study was to determine the biodistribution, dosimetry, and pharmacokinetics of Ga-CBP8 in healthy human subjects. Nine healthy volunteers (5 male and 4 female) underwent whole-body Ga-CBP8 PET/MRI using a Biograph mMR scanner.

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