Publications by authors named "Christopher R Johnson"

Objective: Cardiac sympathetic denervation (CSD) is a surgical antiadrenergic procedure that can reduce sustained ventricular tachyarrhythmia (VT). Video-assisted thoracoscopic surgery (VATS) is currently the standard approach used in CSD, and the practicality for robot-assisted thoracoscopic surgery (RATS) has yet to be investigated.

Methods: We conducted a single-center retrospective study of all adult patients ( = 67) who underwent CSD from 2015 to 2021.

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Introduction: Esophageal cancer is an aggressive malignancy with high mortality. Optimal treatment of esophageal cancer remains an elusive goal. Ribonucleic acid (RNA) interference is a novel potential targeted approach to treat esophageal cancer.

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Background: To the authors' knowledge, the effect of a combination of butorphanol tartrate and detomidine hydrochloride on the laryngeal function and symmetry of the arytenoid cartilages in young Thoroughbred horses has not been examined. Therefore, this study aimed to examine the effects of administration of butorphanol and detomidine on left-to-right rima glottidis ratio (L:R RGR), cross-sectional area of the rima glottidis (CSARG) and grade of laryngeal function of Thoroughbred yearlings examined endoscopically at rest.

Methods: Forty-six Thoroughbred yearlings underwent laryngeal video endoscopy, at rest, before and after sedation with butorphanol and detomidine.

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Unlabelled: Morbidity and mortality (M&M) conferences are rooted within the culture of medicine. They serve a role in every training program and have been mandated by the Accreditation Council for Graduate Medical Education in surgical programs since 1983. Despite the patient safety improvements and educational benefits of these conferences, many adverse events are grossly under-reported.

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  • The study investigates the effectiveness of perioperative fascia iliaca regional anesthesia (FIRA) in reducing pain for hip fracture patients, aiming to identify which types of fractures and surgeries gain the most benefit.
  • Conducted at a Level 1 trauma center, the research compared 949 patients over 60 receiving FIRA with a historical control group not receiving the treatment, assessing morphine milliequivalents (MME) used during hospitalization.
  • Findings indicate that FIRA significantly reduced MME consumption preoperatively for femoral neck fractures and postoperatively for both femoral neck and intertrochanteric fractures, as well as for patients undergoing certain surgical procedures like cephalomedullary nail fixation
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  • Fascia iliaca nerve blocks, either single-shot or continuous, were studied for their effect on pain relief and opioid consumption in geriatric patients with hip fractures.
  • A total of 107 patients were analyzed, and results showed no significant differences in opioid milligram equivalent (MME) consumption or visual analog scale (VAS) pain scores between the two methods at various time points.
  • Both methods led to a significant reduction in hourly opioid consumption post-block, but secondary outcomes like length of hospital stay and readmission rates were also similar between the two approaches.
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  • FIBs help manage pain in older hip fracture patients and reduce opioid use before surgery.
  • Delays in administering these blocks negatively impact pain control and recovery.
  • Faster TTB leads to lower opioid consumption, reduced pain levels, and shorter hospital stays.
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Objective: To describe subchondral lucencies (SCL) in the equine proximal tibia, several treatment options, and clinical outcomes.

Study Design: Retrospective study.

Animals: Seventeen horses with proximal tibial SCL.

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Fusion outcomes and costs of stand-alone anterior lumbar interbody fusion (ALIF), transforaminal lumbar interbody fusion (TLIF) in association with posterior fusion, and anterior/posterior (A/P) fusion were compared using clinical, radiographic, and billing data. Adult patients with symptomatic 1- or 2-level degenerative disk disease in isolation or in association with a grade 1 or 2 degenerative or lytic spondylolisthesis and canal and/or foraminal stenosis who underwent elective stand-alone ALIF, TLIF, or A/P fusion were compared. The analysis focused primarily on fusion rates and costs and secondarily on radiographic and clinical parameters.

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The use of musculoskeletal allografts by orthopedic surgeons continues to rise. The process of procuring and sterilizing allografts is evolving with much consideration to limiting the spread of infectious diseases and preserving tissue integrity. Research involving the application of allografts, particularly for ligament repair, is quite active, necessitating an update for the practicing orthopedist.

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Purpose: Our purpose was to assess functional outcomes, radiographic characteristics and complications in patients who underwent fixation of acetabular fracture using percutaneous means only.

Methods: This was a retrospective cohort study of adult patients with an acetabular fracture admitted to a level 1 trauma centre and treated with closed reduction and percutaneous fixation. Nineteen patients were identified, and mechanism of injury, radiologic classification of fracture, complications and functional outcomes were analysed.

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Objective: To determine if medial femoral condylar (MFC) subchondral cystic lesions (SCL) causing lameness will demonstrate radiographic evidence of healing and lameness reduction after placement of a transcondylar screw in lag fashion.

Study Design: Retrospective case series.

Animals: Horses (n = 20) with lameness attributed to a MFC SCL.

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This study examined behavioral and neuroelectric intra-individual variability (IIV) in preadolescent children during a task requiring variable amounts of cognitive control. The current study further examined whether IIV was moderated by aerobic fitness level. Participants performed a modified flanker task, comprised of congruent and incongruent arrays, within compatible and incompatible stimulus-response conditions.

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A team of scientists and researchers discusses the top 10 challenges in extreme-scale visual analytics (VA). The discussion covers applying VA technologies to both scientific and nonscientific data, evaluating the problems and challenges from both technical and social perspectives.

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Standardized tests have been used to forecast scholastic success of school-age children, and have been related to intelligence, working memory, and inhibition using neuropsychological tests. However, ERP correlates of standardized achievement have not been reported. Thus, the relationship between academic achievement and the P3 component was assessed in a sample of 105 children during performance on a Go/NoGo task.

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Aerobically fit children outperform less fit peers on cognitive control challenges that involve inhibition, cognitive flexibility, and working memory. The aim of this study was to determine whether, compared with less fit children, more fit 9- and 10-year-old pre-adolescents exhibit superior performance on a modified compatible and incompatible flanker task of cognitive control at the initial time of fitness testing and approximately one year later. We found that more fit children demonstrated increased flanker accuracy at both test sessions, coupled with a superior ability to flexibly allocate strategies during task conditions that required different amounts of cognitive control, relative to less fit children.

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Objective: To evaluate the racing and sales performance of Thoroughbred horses with varus angular limb deformities of the carpus treated by unilateral or bilateral single transphyseal screw (STS) placement.

Study Design: Case series.

Animals: Thoroughbred horses (n=53).

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The influence of cardiorespiratory fitness on the modulation of cognitive control was assessed in preadolescent children separated into higher- and lower-fit groups. Participants completed compatible and incompatible stimulus-response conditions of a modified flanker task, consisting of congruent and incongruent arrays, while ERPs and task performance were concurrently measured. Findings revealed decreased response accuracy for lower- relative to higher-fit participants with a selectively larger deficit in response to the incompatible stimulus-response condition, requiring the greatest amount of cognitive control.

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A hole- and electron-conducting polymer has been prepared by electropolymerization of a porphyrin-fullerene monomer. The porphyrin units are linked by aminophenyl groups to form a linear chain in which the porphyrin is an integral part of the polymer backbone. The absorption spectrum of a film formed on indium-tin-oxide-coated glass resembles that of a model porphyrin-fullerene dyad, but with significant peak broadening.

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Forward and reverse genetics now allow researchers to understand embryonic and postnatal gene function in a broad range of species. Although some genetic mutations cause obvious morphological change, other mutations can be more subtle and, without adequate observation and quantification, might be overlooked. For the increasing number of genetic model organisms examined by the growing field of phenomics, standardized but sensitive methods for quantitative analysis need to be incorporated into routine practice to effectively acquire and analyze ever-increasing quantities of phenotypic data.

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Task Force 1st Armored Division (TF1AD) deployed to Baghdad and South Central Iraq from April 2003 through July 2004. TF1AD preventive medicine had responsibility for ensuring divisional force health protection, including soldier health, disease and nonbattle injury mitigation, health promotion, and civil affairs operations. Heat injury, diarrheal disease, skin and respiratory disease, and eye and musculoskeletal injury rates were high.

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A bold new effort to disrupt every gene in the mouse genome necessitates systematic, interdisciplinary approaches to analyzing patterning defects in the mouse embryo. We present a novel, rapid, and inexpensive method for obtaining high-resolution virtual histology for phenotypic assessment of mouse embryos. Using osmium tetroxide to differentially stain tissues followed by volumetric X-ray computed tomography to image whole embryos, isometric resolutions of 27 mum or 8 mum were achieved with scan times of 2 h or 12 h, respectively, using mid-gestation E9.

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Contrast-enhanced small-animal computed tomography is an economical and highly quantitative tool for serially examining tumor development in situ, for analyzing the network of blood vessels that nourish them, and for following the response of tumors to preclinical therapeutic intervention(s). We present practical considerations for visualizing the vascular network of transgenic mouse tumors. Using a long-acting iodinated triglyceride blood-pool contrast agent, we present optimized scanner acquisition parameters and volume-rendering techniques for examining the intermediate and large vessels of complex spontaneous tumors (e.

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