Publications by authors named "Dudley R"

Objectives: Providers vary in their impact on clinical outcomes, but this is rarely accounted for in healthcare research. By failing to identify the provider responsible for a patient's care, investigators miss an opportunity to account for nonrandom variation in outcomes. Prior methods of identifying responsible providers have relied on manual chart review, which is time-consuming and expensive, or analysis of claims data, which has been demonstrated to be inaccurate.

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Many wingless arboreal arthropods can glide back to tree trunks following free falls. However, little is known about the behaviors and aerodynamics underlying such aerial performance, and how this may be influenced by body size. Here, we studied gliding performance by nymphs of the stick insect Extatosoma tiaratum, focusing on the dynamics of J-shaped trajectories and how gliding capability changes during ontogeny.

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Background: One in three people with psychosis experience visions. However, little is known about what people see, and current treatments have limited benefits.

Objectives: To improve the understanding and treatment of visions, this study explored the phenomenology of visions in people with psychosis.

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Objective: Cerebral spinal fluid (CSF) diversion methods, including ventriculoperitoneal (VP) shunts, are the standard treatment for hydrocephalus. Hair clipping (HC) has been a routine neurosurgical practice of the great majority of neurosurgeons, due to the perception that this will either decrease the risk of shunt infection or allow for a faster, unimpeded opening and closing of the skin. The benefits of not cutting or clipping hair in terms of normalizing appearance and self-esteem are obvious.

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Article Synopsis
  • * The authors share a case where a child experienced near-complete spontaneous recovery from progressive cervical spine kyphosis without requiring spinal fusion surgery.
  • * This case highlights the possibility of spontaneous recovery in certain patients and suggests that a cautious monitoring approach could be beneficial for those without neurological deficits, avoiding unnecessary surgical risks.
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Purpose: The profession of physical therapy has historically relied on manual facilitation to improve motor control strategies and performance in persons rehabilitating from a stroke, yet there is insufficient evidence to support its use during functional task training. The purpose of this study was to determine the effects of integrated cueing (verbal and manual) and verbal cueing approaches during sit-to-stand training on midline alignment & muscle activation in chronic stroke survivors.

Methods: Twenty-one chronic right-brained stroke survivors with hemiplegia were randomly assigned to the Integrated Cueing or Verbal Only group and outcome measures were recorded using an 18-Camera Motion Capture System, force plates, and surface electromyography (EMG).

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Auditory hallucinations are common in people with histories of adversity, possibly indicating a causal relationship. However, hallucinations occur in multiple sensory modalities and the relationship between trauma and hallucinations in other sensory domains is less explored. We examined the occurrence of hallucinatory experiences in different sensory modalities in people with psychosis who also met criteria for Post-Traumatic Stress Disorder (n = 67).

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  • Recent studies suggest that oligodendrocyte lineage cells show varying functional and molecular characteristics during development and in diseases, notably multiple sclerosis, where grey matter lesions undergo more remyelination than white matter lesions.* -
  • Research comparing progenitor cells and mature oligodendrocytes from grey and white matter revealed that grey matter cells were better at ensheathing synthetic nanofibers and were more vulnerable to metabolic injury, indicating unique molecular profiles between the two types.* -
  • RNA sequencing demonstrated that differences in gene expression are more pronounced between cell types than regions, with grey matter cells showing higher levels of genes important for myelination, while both cell types exhibited up-regulated genes related to stress and injury response.*
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Background: Post-traumatic stress disorder (PTSD) has been shown to predict psychotic symptomology. However, few studies have examined the relative contribution of PTSD compared to broader post-traumatic sequelae in maintaining psychosis. Complex PTSD (cPTSD), operationalized using ICD-11 criteria, includes core PTSD (intrusions, avoidance, hyperarousal) as well as additional "disturbances of self-organisation" (DSO; emotional dysregulation, interpersonal difficulties, negative self-concept) symptoms, more likely to be associated with complex trauma histories.

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Histone H3-mutant gliomas are deadly brain tumors characterized by a dysregulated epigenome and stalled differentiation. In contrast to the extensive datasets available on tumor cells, limited information exists on their tumor microenvironment (TME), particularly the immune infiltrate. Here, we characterize the immune TME of H3.

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Background And Hypothesis: The role of early adversity and trauma is increasingly recognized in psychosis but treatments for trauma and its consequences are lacking. Psychological treatments need to understand the prevalence of these experiences, the relationship with specific symptoms and identify potentially tractable processes that may be targeted in therapy. It was hypothesized that greater adversity, and specifically abuse rather than neglect, would be associated with positive symptoms and specifically hallucinations.

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Background And Objectives: Neuroimaging studies in patients with temporal lobe epilepsy (TLE) show widespread brain network alterations beyond the mesiotemporal lobe. Despite the critical role of the cerebrovascular system in maintaining whole-brain structure and function, changes in cerebral blood flow (CBF) remain incompletely understood in the disease. Here, we studied whole-brain perfusion and vascular network alterations in TLE and assessed its associations with gray and white matter compromises and various clinical variables.

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Hallucinations are a common feature of psychosis, yet access to effective psychological treatment is limited. The Managing Unusual Sensory Experiences for First-Episode-Psychosis (MUSE-FEP) trial aimed to establish the feasibility and acceptability of a brief, hallucination-specific, digitally provided treatment, delivered by a non-specialist workforce for people with psychosis. MUSE uses psychoeducation about the causal mechanisms of hallucinations and tailored interventions to help a person understand and manage their experiences.

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Article Synopsis
  • Metformin has the potential to improve the myelination abilities of oligodendrocyte progenitor cells in aged rats and may aid recovery in children with brain injuries from radiation.
  • In experiments, human progenitor cells from both adults and children showed greater ensheathment capacity than mature oligodendrocytes, though metformin enhanced this capacity in adult cells while reducing it in pediatric cells.
  • The study revealed that metformin caused distinct changes in gene expression based on age, with adult cells benefiting in pathways related to growth and lipid synthesis, whereas pediatric cells experienced more down-regulation affecting their morphology and development.
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When perceived as threatening, social interactions have been shown to trigger the sympathoadrenal medullary system as well as the hypothalamic-pituitary-adrenal axis resulting in a physiologic stress response. The allostatic load placed on human health and physiology in the context of acute and chronic stress can have profound health consequences. The purpose of this study was to develop a protocol for a lab-based stress stimulus using social-evaluative threat.

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  • Scientists created a new way to grow special brain cells called microglia from a patient with a rare disease that affects their CSF1R gene.
  • The new method allowed them to produce more healthy microglia-like cells that behave more like natural brain cells, and the cells from the patient showed differences in how they work.
  • They found that the patient’s cells had problems with communication and movement, along with an increased response to inflammation, showing the impact of the faulty CSF1R gene.
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Background: The literature has suggested a variety of postural changes of the spine that possibly contribute to the increase in back pain during sitting in persons with non-specific chronic low back pain (NS-CLBP). However, the heterogeneity of NS-CLBP persons has made the ability to attribute pain increase to a particular sitting posture very difficult. Therefore, the purpose of this study was to compare lumbosacral kinematics and their roles in pain increase among homogenous NS-CLBP subgroups and healthy controls over a 1-h sitting period.

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Oligodendrocyte (OL) injury and subsequent loss is a pathologic hallmark of multiple sclerosis (MS). Stress granules (SGs) are membrane-less organelles containing mRNAs stalled in translation and considered as participants of the cellular response to stress. Here we show SGs in OLs in active and inactive areas of MS lesions as well as in normal-appearing white matter.

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Introduction: Vivid mental imagery has been proposed to increase the likelihood of experiencing hallucinations. Typically, studies have employed a modality general approach to mental imagery which compares imagery across multiple domains (e.g.

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Background: Both tibial tuberosity fractures and deviation from the planned postoperative tibial plateau angle have been associated with poor centring of tibial plateau levelling osteotomies (TPLOs). The aim of this cadaveric study was to compare two techniques for centring the osteotomy and preserving the tibial tuberosity width (TTW).

Methods: Stifle radiographs were obtained from 20 limbs of 10 dogs.

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Background: Cellular senescence can have positive and negative effects on the body, including aiding in damage repair and facilitating tumor growth. Adamantinomatous craniopharyngioma (ACP), the most common pediatric sellar/suprasellar brain tumor, poses significant treatment challenges. Recent studies suggest that senescent cells in ACP tumors may contribute to tumor growth and invasion by releasing a senesecence-associated secretory phenotype.

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We evaluated the utility of genetic testing in the pre-surgical evaluation of pediatric patients with drug-resistant focal epilepsy. This single-center retrospective study reviewed the charts of all pediatric patients referred for epilepsy surgery evaluation over a 5-year period. We extracted and analyzed results of genetic testing as well as clinical, EEG, and neuroimaging data.

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Article Synopsis
  • Targeted therapies, such as small molecule inhibitors for aberrant kinase signaling and chromatin regulators, show promise in treating high-grade gliomas (HGG), but typically result in only temporary responses.
  • Recent research highlights the collaboration between epigenetic regulators and kinase signaling networks, which contributes to the aggressive nature of the gliomas and their resistance to treatment.
  • This review focuses on five key chromatin regulators with potential for pharmacological targeting, emphasizing that combining the inhibition of these regulators with kinase signaling could enhance treatment effectiveness in HGG, improving patient outcomes.
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