Publications by authors named "David Cassidy"

Background: Lumbar disc herniation (LDH) with radiculopathy is associated with greater pain, disability, healthcare use, and costs compared with nonspecific low back pain. Reliable information about its incidence and risk factors were lacking.

Questions: (1) What is the incidence of lumbar disc herniation (LDH) with radiculopathy in adults? (2) What are the risk factors for LDH with radiculopathy in adults?

Methods: Systematic review.

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  • The global sports medicine community is interested in understanding if repetitive head impacts (RHI) lead to chronic traumatic encephalopathy (CTE) and its related clinical syndromes.
  • A 2022 article claimed to provide definitive proof of causality between RHI and CTE using the Bradford Hill criteria, sparking significant media attention.
  • However, the authors of this counterpoint argue that the evidence is insufficient to support those claims and stress the need for precise definitions, consistent measurements, and well-designed studies before establishing any causal links.
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This prospective, community-based, active surveillance study aimed to report the incidence of moderate, severe, and serious adverse events (AEs) after chiropractic (n = 100) / physiotherapist (n = 50) visit in offices throughout North America between October-2015 and December-2017. Three content-validated questionnaires were used to collect AE information: two completed by the patient (pre-treatment [T0] and 2-7 days post-treatment [T2]) and one completed by the provider immediately post-treatment [T1]. Any new or worsened symptom was considered an AE and further classified as mild, moderate, severe or serious.

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Objective: Few clinical prediction models are available to clinicians to predict the recovery of patients with post-collision neck pain and associated disorders. We aimed to develop evidence-based clinical prediction models to predict (1) self-reported recovery and (2) insurance claim closure from neck pain and associated disorders (NAD) caused or aggravated by a traffic collision.

Methods: The selection of potential predictors was informed by a systematic review of the literature.

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The purpose of this paper is to summarise the consensus methodology that was used to inform the International Consensus Statement on Concussion in Sport (Amsterdam 2022). Building on a Delphi process to inform the questions and outcomes from the 5th International Conference on Concussion in Sport, the Scientific Committee identified key questions, the answers to which would help encapsulate the current science in sport-related concussion and help guide clinical practice. Over 3½ years, delayed by 2 years due to the pandemic, author groups conducted systematic reviews on each selected topic.

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Objective: Concern exists about possible problems with later-in-life brain health, such as cognitive impairment, mental health problems and neurological diseases, in former athletes. We examined the future risk for adverse health effects associated with sport-related concussion, or exposure to repetitive head impacts, in former athletes.

Design: Systematic review.

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  • A systematic review and meta-analysis investigated the prevalence of self-reported post-concussion symptoms (PCS) and disability in adults after mild traumatic brain injury (mTBI), finding mixed results across 43 studies.
  • At 3-6 months post-injury, approximately 31.3% reported PCS using a lenient definition, and 54.0% experienced disability, with a notable difference between those with mTBI and orthopedic injuries.
  • The review suggests that while nearly one in three adults may experience mild PCS, the true prevalence could be closer to one in six when accounting for bias due to participant drop-out, indicating a need for more robust studies.
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In this paper, the author, a historian, describes the challenges he encountered as he sought to turn the Farm Hall event and its surviving transcripts into a theatrical play. The play, Farm Hall, was produced in New York in 2014 and published in Cassidy 2017. This paper further discusses what the author learned about the nature and elements of a play, how he applied those lessons to his play, and the advantages and disadvantages of this genre for bringing historical events to the general public.

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Importance: In 2018, the combination of glial fibrillary acidic protein (GFAP) and ubiquitin C-terminal hydrolase (UCH-L1) levels became the first US Food and Drug Administration-approved blood test to detect intracranial lesions after mild to moderate traumatic brain injury (MTBI). How this blood test compares with validated clinical decision rules remains unknown.

Objectives: To compare the performance of GFAP and UCH-L1 levels vs 3 validated clinical decision rules for detecting traumatic intracranial lesions on computed tomography (CT) in patients with MTBI and to evaluate combining biomarkers with clinical decision rules.

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Background: A likely consequence of the discontinued distribution and sale of the HVAD System (Medtronic, Minneapolis, MN) will be an increase in replacement with the HeartMate 3 (Abbott, Chicago, IL) left ventricular assist device when device exchange is necessary. If part or all of the HVAD 10-mm-diameter outflow graft is retained during replacement, the HeartMate 3 will have to run at a higher speed than it would with its 14-mm-diameter graft.

Methods: A steady-state, in vitro study was run with 250-mm-long samples of HVAD, HeartMate 3, and half-HVAD/half-HeartMate 3 grafts and additionally 125- and 375-mm-long samples of the HVAD graft.

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  • The study aimed to assess the inter-rater reliability of the Quebec Task Force classification system for Whiplash-Associated Disorders (WAD) by comparing an experienced clinician with chiropractic residents.
  • Findings showed significant variability in inter-rater reliability, with Cohen's kappa ranging from 0.04 to 0.80, indicating differing levels of agreement among raters.
  • The conclusion emphasized that the reliability of WAD classification depends on raters' experience and understanding, suggesting the need for training to improve consistency and advocating for further research in diverse clinical settings.
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Importance: The management of traffic injuries is challenging for clinicians. Knowledge about predictors of nonrecovery from traffic injuries may help to improve patient care.

Objective: To develop a prediction model for self-reported overall nonrecovery from traffic injuries six months post-collision in adults with incident traffic injuries including post-traumatic headache (PTH).

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Objectives: Objective of this study is to develop an evidence-based guideline for the noninvasive management of soft tissue disorders of the shoulder (shoulder pain), excluding major pathology.

Methods: This guideline is based on high-quality evidence from seven systematic reviews. Multidisciplinary experts considered the evidence of effectiveness, safety, cost-effectiveness, societal and ethical values, and patient experiences when formulating recommendations.

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  • Claims have risen regarding the effectiveness of spinal manipulative therapy (SMT) in boosting immune function, especially during COVID-19, leading to a mix of true and false information.
  • The objective of the study was to review scientific literature on SMT's impact on infectious disease prevention, treatment outcomes, and its relationship to various physiological markers.
  • The literature search revealed that no robust clinical studies demonstrated SMT's effectiveness in preventing infectious diseases or improving outcomes related to them, and it did not significantly affect immune biomarkers in studied participants.
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Background: A small proportion of chiropractors, osteopaths, and other manual medicine providers use spinal manipulative therapy (SMT) to manage non-musculoskeletal disorders. However, the efficacy and effectiveness of these interventions to prevent or treat non-musculoskeletal disorders remain controversial.

Objectives: We convened a Global Summit of international scientists to conduct a systematic review of the literature to determine the efficacy and effectiveness of SMT for the primary, secondary and tertiary prevention of non-musculoskeletal disorders.

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Objective: To evaluate clinical prediction tools for making decisions in patients with severe urinary tract infections (UTIs).

Methods: This was a retrospective study conducted at 2 hospitals (combined emergency department (ED) census 190,000). Study patients were admitted via the ED with acute pyelonephritis or severe sepsis-septic shock related UTI.

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Background: Prognostic research has many important purposes, including (i) describing the natural history and clinical course of health conditions, (ii) investigating variables associated with health outcomes of interest, (iii) estimating an individual's probability of developing different outcomes, (iv) investigating the clinical application of prediction models, and (v) investigating determinants of recovery that can inform the development of interventions to improve patient outcomes. But much prognostic research has been poorly conducted and interpreted, indicating that a number of conceptual areas are often misunderstood. Recent initiatives to improve this include the Prognosis Research Strategy (PROGRESS) and the Transparent Reporting of a multivariable prediction model for Individual Prognosis or Diagnosis (TRIPOD) Statement.

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Study Objective: Debate exists about the mortality benefit of administering antibiotics within either 1 or 3 hours of sepsis onset. We performed this meta-analysis to analyze the effect of immediate (0 to 1 hour after onset) versus early (1 to 3 hours after onset) antibiotics on mortality in patients with severe sepsis or septic shock.

Methods: This review was consistent with the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines.

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Importance: The prognosis of post-traumatic headache is poorly understood.

Objective: To develop and validate a prognostic model to predict the presence of post-traumatic headache six months after a traffic collision in adults with incident post-traumatic headache.

Design: Secondary analyses of adults with incident post-traumatic headache injured in traffic collisions between November 1997 and December 1999 in Saskatchewan, Canada (development cohort); and between January 2004 and January 2005 in Sweden (validation cohort).

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Background: In the midst of the coronavirus pandemic, the International Chiropractors Association (ICA) posted reports claiming that chiropractic care can impact the immune system. These claims clash with recommendations from the World Health Organization and World Federation of Chiropractic. We discuss the scientific validity of the claims made in these ICA reports.

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Background: In occupational rehabilitation programs, return-to-work is a key outcome measure; however, the studies either used different definitions for return-to-work or do not provide their definition. In order to provide a solution to this issue, we developed a self-report return-to-work measure.

Objective: We investigated the reliability and validity of a self-report return-to-work questionnaire in a cohort of workers with a work-related injury.

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