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  1. Article ; Online: Pediatric capacity crisis: A framework and strategies to prepare for a pediatric surge.

    Bongiorno, Diana M / Ravicz, Miranda / Nadeau, Nicole L / Michelson, Kenneth A / Alpern, Elizabeth R / Myers, Sage R / Samuels-Kalow, Margaret E

    Journal of the American College of Emergency Physicians open

    2024  Volume 5, Issue 1, Page(s) e13093

    Abstract: A pediatric capacity crisis developed across the country in the Fall and Winter of 2022 due to a combination of factors, including a surge in respiratory viruses, staffing shortages, and historical closures of inpatient pediatric units. The COVID-19 ... ...

    Abstract A pediatric capacity crisis developed across the country in the Fall and Winter of 2022 due to a combination of factors, including a surge in respiratory viruses, staffing shortages, and historical closures of inpatient pediatric units. The COVID-19 pandemic and associated surge in critically ill adult patients demonstrated that health care systems and health care workers can quickly implement creative and collaborative system-wide solutions to deliver the best care possible during a capacity crisis. Similar solutions are needed to respond to future surges in pediatric volume and to maintain a high standard of care during such a surge. This paper aims to build upon insights from the COVID-19 and H1N1 pandemic responses and the 2022 pediatric capacity crisis. We provide specific recommendations addressing governmental/policy, hospital/health care system, and individual clinician strategies that can be implemented to manage future surges in pediatric patient volume.
    Language English
    Publishing date 2024-01-16
    Publishing country United States
    Document type Journal Article
    ISSN 2688-1152
    ISSN (online) 2688-1152
    DOI 10.1002/emp2.13093
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  2. Article ; Online: Impact of holistic review on diversity of interviewed and matriculating residents in graduate medical education: a systematic review protocol.

    Althans, Alison R / Byrd, Tamara / Suppok, Rachel / Lee, Kenneth K / Rosengart, Matthew R / Myers, Sara P

    BMJ open

    2023  Volume 13, Issue 7, Page(s) e074118

    Abstract: Introduction: Diversity in the physician workforce improves patient-centred outcomes. Patients are more likely to trust in and comply with care when seeing gender/racially concordant providers. A current emphasis on standardised metrics in academic ... ...

    Abstract Introduction: Diversity in the physician workforce improves patient-centred outcomes. Patients are more likely to trust in and comply with care when seeing gender/racially concordant providers. A current emphasis on standardised metrics in academic achievement often serves as a barrier to the recruitment and retention of gender and racial minorities in medicine. Holistic review of residency applicants has been supported as a means of encouraging diversification but is not yet standardised. The current body of evidence examining the effects of holistic review on the recruitment of racial and gender minorities in surgical residencies is small. We therefore propose a systematic review to summarise the state of holistic review in graduate medical education in the USA and its impact on diversification.
    Methods and analysis: Our systematic review protocol has been designed with plans to report our review findings in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols guidelines. PubMed and Embase will be searched with the assistance of a health sciences librarian with expertise in systematic review. We will include studies of graduate medical education programmes that describe the implementation of holistic review, outline the components of their holistic review process and compare proportions of under-represented minorities (URM) and women interviewed and matriculating before and after holistic review implementation. We will first report a summary of the findings regarding the operationalisation of holistic review as described by studies included. We will then pool the percentages of URM and women for interviewee and matriculant populations from each study and report the collective odds ratios of each for holistic review compared with traditional review as our primary outcome.
    Ethics and dissemination: This study is a protocol for systematic review, and therefore does not involve any human subjects. Findings will be published in the form of a manuscript submitted to a peer-reviewed journal.
    Prospero registration number: CRD42023401389.
    MeSH term(s) Female ; Humans ; Academic Success ; Benchmarking ; Education, Medical, Graduate ; Educational Status ; Internship and Residency ; Systematic Reviews as Topic
    Language English
    Publishing date 2023-07-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2599832-8
    ISSN 2044-6055 ; 2044-6055
    ISSN (online) 2044-6055
    ISSN 2044-6055
    DOI 10.1136/bmjopen-2023-074118
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  3. Article ; Online: Utility of genetic testing in the pre-surgical evaluation of children with drug-resistant epilepsy.

    Alsubhi, Sarah / Berrahmoune, Saoussen / Dudley, Roy W R / Dufresne, David / Simard Tremblay, Elisabeth / Srour, Myriam / Myers, Kenneth A

    Journal of neurology

    2024  Volume 271, Issue 5, Page(s) 2503–2508

    Abstract: 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 ... ...

    Abstract 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. Of 125 patients referred for epilepsy surgical evaluation, 86 (69%) had some form of genetic testing. Of these, 18 (21%) had a pathogenic or likely pathogenic variant identified. Genes affected included NPRL3 (3 patients, all related), TSC2 (3 patients), KCNH1, CHRNA4, SPTAN1, DEPDC5, SCN2A, ARX, SCN1A, DLG4, and ST5. One patient had ring chromosome 20, one a 7.17p12 duplication, and one a 15q13 deletion. In six patients, suspected epileptogenic lesions were identified on brain MRI that were thought to be unrelated to the genetic finding. A specific medical therapy choice was allowed due to genetic diagnosis in three patients who did not undergo surgery. Obtaining a molecular diagnosis may dramatically alter management in pediatric patients with drug-resistant focal epilepsy. Genetic testing should be incorporated as part of standard investigations in the pre-surgical work-up of pediatric patients with drug-resistant focal epilepsy.
    MeSH term(s) Humans ; Child ; Drug Resistant Epilepsy/genetics ; Drug Resistant Epilepsy/surgery ; Drug Resistant Epilepsy/diagnostic imaging ; Male ; Female ; Genetic Testing ; Retrospective Studies ; Adolescent ; Child, Preschool ; Infant ; Electroencephalography ; Magnetic Resonance Imaging ; Epilepsies, Partial/genetics ; Epilepsies, Partial/surgery ; Epilepsies, Partial/diagnostic imaging ; Epilepsies, Partial/diagnosis ; Preoperative Care
    Language English
    Publishing date 2024-01-23
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 187050-6
    ISSN 1432-1459 ; 0340-5354 ; 0012-1037 ; 0939-1517 ; 1619-800X
    ISSN (online) 1432-1459
    ISSN 0340-5354 ; 0012-1037 ; 0939-1517 ; 1619-800X
    DOI 10.1007/s00415-023-12174-3
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  4. Article ; Online: Evaluation of Transmission Near the Christiansen Wavelength for Dynamic Sand Samples.

    McGinnis, Cobey L / Frantz, Jesse A / Myers, Jason D / Clabeau, Anthony R / Moore, Austin F / Ewing, Kenneth J / Hart, Matthew B / Watnick, Abbie T / Sanghera, Jasbinder S

    Applied spectroscopy

    2024  , Page(s) 37028241238782

    Abstract: Many optical applications, including free-space optical communications, lidar, and astronomical measurements, are impacted by the presence of light-scattering particles also known as obscurants. Scattering from particles consisting of sand, dust, dirt, ... ...

    Abstract Many optical applications, including free-space optical communications, lidar, and astronomical measurements, are impacted by the presence of light-scattering particles also known as obscurants. Scattering from particles consisting of sand, dust, dirt, and other substances can significantly degrade optical signals. For many obscurants, the index of refraction is dependent on the wavelength of light, and there exists a Christiansen wavelength (λ
    Language English
    Publishing date 2024-04-03
    Publishing country United States
    Document type Journal Article
    ISSN 1943-3530
    ISSN (online) 1943-3530
    DOI 10.1177/00037028241238782
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  5. Article ; Online: Cancer Cells and M2 Macrophages: Cooperative Invasive Ecosystem Engineers.

    Myers, Kayla V / Pienta, Kenneth J / Amend, Sarah R

    Cancer control : journal of the Moffitt Cancer Center

    2020  Volume 27, Issue 1, Page(s) 1073274820911058

    Abstract: Many aspects of cancer can be explained utilizing well-defined ecological principles. Applying these principles to cancer, cancer cells are an invasive species to a healthy organ ecosystem. In their capacity as ecosystem engineers, cancer cells release ... ...

    Abstract Many aspects of cancer can be explained utilizing well-defined ecological principles. Applying these principles to cancer, cancer cells are an invasive species to a healthy organ ecosystem. In their capacity as ecosystem engineers, cancer cells release cytokines that recruit monocytes to the tumor and polarize them to M2-like protumor macrophages. Macrophages, recruited by the cancer cells, act as a secondary invasive species. The ecosystem engineering functions of M2-macrophages in turn support and stimulate cancer cell survival and proliferation. The cooperative ecosystem engineering of both the primary invasive species of the cancer cell and the secondary invasive species of the M2-macrophage thus creates a vicious cycle of tumor promotion. Targeting a specific aspect of this tumor-promoting ecosystem engineering, such as blocking efferocytosis by M2-like macrophages, may improve the response to standard-of-care anticancer therapies. This strategy has the potential to redirect cooperative protumor ecosystem engineering toward an antitumor ecosystem engineering strategy.
    MeSH term(s) Cell Line, Tumor ; Ecosystem ; Humans ; Macrophages/metabolism ; Tissue Engineering/methods
    Language English
    Publishing date 2020-03-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1328503-8
    ISSN 1526-2359 ; 1073-2748
    ISSN (online) 1526-2359
    ISSN 1073-2748
    DOI 10.1177/1073274820911058
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Actin capping protein regulates postsynaptic spine development through CPI-motif interactions.

    Myers, Kenneth R / Fan, Yanjie / McConnell, Patrick / Cooper, John A / Zheng, James Q

    Frontiers in molecular neuroscience

    2022  Volume 15, Page(s) 1020949

    Abstract: Dendritic spines are small actin-rich protrusions essential for the formation of functional circuits in the mammalian brain. During development, spines begin as dynamic filopodia-like protrusions that are then replaced by relatively stable spines ... ...

    Abstract Dendritic spines are small actin-rich protrusions essential for the formation of functional circuits in the mammalian brain. During development, spines begin as dynamic filopodia-like protrusions that are then replaced by relatively stable spines containing an expanded head. Remodeling of the actin cytoskeleton plays a key role in the formation and modification of spine morphology, however many of the underlying regulatory mechanisms remain unclear. Capping protein (CP) is a major actin regulating protein that caps the barbed ends of actin filaments, and promotes the formation of dense branched actin networks. Knockdown of CP impairs the formation of mature spines, leading to an increase in the number of filopodia-like protrusions and defects in synaptic transmission. Here, we show that CP promotes the stabilization of dendritic protrusions, leading to the formation of stable mature spines. However, the localization and function of CP in dendritic spines requires interactions with proteins containing a capping protein interaction (CPI) motif. We found that the CPI motif-containing protein Twinfilin-1 (Twf1) also localizes to spines where it plays a role in CP spine enrichment. The knockdown of Twf1 leads to an increase in the density of filopodia-like protrusions and a decrease in the stability of dendritic protrusions, similar to CP knockdown. Finally, we show that CP directly interacts with Shank and regulates its spine accumulation. These results suggest that spatiotemporal regulation of CP in spines not only controls the actin dynamics underlying the formation of stable postsynaptic spine structures, but also plays an important role in the assembly of the postsynaptic apparatus underlying synaptic function.
    Language English
    Publishing date 2022-09-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2452967-9
    ISSN 1662-5099
    ISSN 1662-5099
    DOI 10.3389/fnmol.2022.1020949
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  7. Article ; Online: Total outward leakage of half-mask respirators and surgical masks used for source control.

    Myers, Warren R / Yang, Weihua / Ryan, Kenneth J / Bergman, Michael S / M Fisher, Edward / Soo, Jhy-Charm / Zhuang, Ziqing

    Journal of occupational and environmental hygiene

    2023  Volume 20, Issue 12, Page(s) 610–620

    Abstract: Both respirators and surgical masks (SM) are used as source control devices. During the COVID-19 pandemic, there was much interest in understanding the extent of particle total outward leakage (TOL) from these devices. The objective of this study was to ... ...

    Abstract Both respirators and surgical masks (SM) are used as source control devices. During the COVID-19 pandemic, there was much interest in understanding the extent of particle total outward leakage (TOL) from these devices. The objective of this study was to quantify the TOL for five categories of devices: SMs, National Institute for Occupational Safety and Health (NIOSH) Approved N95 filtering facepiece respirators (FFRs) without exhalation valves, NIOSH Approved N95 FFRs with exhalation valves (N95 FFRV), NIOSH Approved elastomeric half-mask respirators (EHMRs) with exhalation valves, and NIOSH Approved EHMRs with an SM covering the exhalation valve (EHMRSM). A benchtop test system was designed to test two models of each device category. Each device was mounted on a headform at three faceseal levels (0% faceseal, 50% faceseal, and 100% faceseal). At each faceseal level, the TOL was assessed at three flow rates of minute ventilations of 17, 28, and 39 L/min. The experimental design was a split-split-plot configuration. Device type, faceseal level, flow rate, and the interaction of device type and faceseal level were found to have a significant effect (
    MeSH term(s) United States ; Humans ; Occupational Exposure/prevention & control ; Masks ; Pandemics ; Respiratory Protective Devices ; Ventilators, Mechanical ; Filtration
    Language English
    Publishing date 2023-09-08
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 2131820-7
    ISSN 1545-9632 ; 1545-9624
    ISSN (online) 1545-9632
    ISSN 1545-9624
    DOI 10.1080/15459624.2023.2257254
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  8. Article ; Online: Investigation into the Cost-Effectiveness of Extended Posttraumatic Thromboprophylaxis.

    Nicholson, Kristina J / Rosengart, Matthew R / Smith, Kenneth J / Neal, Matthew D / Myers, Sara P

    Journal of the American College of Surgeons

    2022  Volume 234, Issue 1, Page(s) 86–94

    Abstract: Background: Severely injured patients are at particularly high risk for venous thromboembolism (VTE). Although thromboprophylaxis (PPX) is employed during the inpatient period, patients may continue to be at high risk after discharge. Comparative ... ...

    Abstract Background: Severely injured patients are at particularly high risk for venous thromboembolism (VTE). Although thromboprophylaxis (PPX) is employed during the inpatient period, patients may continue to be at high risk after discharge. Comparative evidence from surgical subspecialities (eg oncology) reveals benefits of postdischarge (ie extended) PPX. We hypothesized that an extended, postinjury oral thromboprophylaxis regimen would be cost-effective.
    Study design: A cost-utility model compared no PPX with a 30-day course of apixaban, dabigatran, enoxaparin, fondaparinux, or rivaroxaban in trauma patients. Immediate events including deep venous thrombosis, pulmonary embolus, or bleeding within 30 days of injury were modeled in a decision tree with patients entering a Markov process to account for sequelae of VTE, including postthrombotic syndrome and chronic thromboembolic pulmonary hypertension. Effectiveness was measured in quality-adjusted life years. One-way and probabilistic sensitivity analyses were performed to identify conditions under which the preferred PPX strategy changed.
    Results: Rivaroxaban was the dominant strategy (ie less costly and more effective) compared with no PPX or alternative regimens, delivering 30.21 quality-adjusted life years for $404,546.38. One-way sensitivity analyses demonstrated robust preference for rivaroxaban. When examining only patients with moderate-high or high VTE Risk Assessment Profile scores, rivaroxaban remained the preferred strategy. Probabilistic sensitivity analysis demonstrated a preference for rivaroxaban in 100% of cases at a standard willingness-to-pay threshold of $100,000/quality-adjusted life year.
    Conclusions: A 30-day course of rivaroxaban is a cost-effective extended thromboprophylaxis strategy in trauma patients in this theoretical study. Prospective studies of postdischarge thromboprophylaxis to prevent postinjury VTE are warranted.
    MeSH term(s) Aftercare ; Anticoagulants/therapeutic use ; Cost-Benefit Analysis ; Humans ; Patient Discharge ; Prospective Studies ; Rivaroxaban/therapeutic use ; Venous Thromboembolism/etiology ; Venous Thromboembolism/prevention & control
    Chemical Substances Anticoagulants ; Rivaroxaban (9NDF7JZ4M3)
    Language English
    Publishing date 2022-02-18
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1181115-8
    ISSN 1879-1190 ; 1072-7515
    ISSN (online) 1879-1190
    ISSN 1072-7515
    DOI 10.1097/XCS.0000000000000033
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  9. Article ; Online: Targeting MerTK decreases efferocytosis and increases anti-tumor immune infiltrate in prostate cancer.

    Myers Chen, Kayla V / de Groot, Amber E / Mendez, Sabrina A / Mallin, Mikaela M / Amend, Sarah R / Pienta, Kenneth J

    Medical oncology (Northwood, London, England)

    2023  Volume 40, Issue 10, Page(s) 284

    Abstract: The prostate cancer tumor microenvironment (TME) is comprised of many cell types that can contribute to and influence tumor progression. Some of the most abundant prostate cancer TME cells are macrophages, which can be modeled on a continuous spectrum of ...

    Abstract The prostate cancer tumor microenvironment (TME) is comprised of many cell types that can contribute to and influence tumor progression. Some of the most abundant prostate cancer TME cells are macrophages, which can be modeled on a continuous spectrum of M1-like (anti-tumor macrophages) to M2-like (pro-tumor macrophages). A function of M2-like macrophages is efferocytosis, the phagocytosis of apoptotic cells. Based on literature from other models and contexts, efferocytosis further supports the M2-like macrophage phenotype. MerTK is a receptor tyrosine kinase that mediates efferocytosis by binding phosphatidylserine on apoptotic cells. We hypothesize efferocytosis in the prostate cancer TME is a tumor-promoting function of macrophages and that targeting MerTK-mediated efferocytosis will slow prostate cancer growth and promote an anti-tumor immune infiltrate. The aims of this study are to measure efferocytosis of prostate cancer cells by in vitro human M1/M2 macrophage models and assess changes in the M2-like, pro-tumor macrophage phenotype following prostate cancer efferocytosis. Additionally, this study aims to demonstrate that targeting MerTK decreases prostate cancer efferocytosis and promotes an anti-tumor immune infiltrate. We have developed methodology using flow cytometry to quantify efferocytosis of human prostate cancer cells using the LNCaP cell line. We observed that M2 macrophages efferocytose the LNCaP cell line more than M1 macrophages. Following efferocytosis of LNCaP cells by M2 human monocyte-derived macrophages (HMDMs), we observed an increase in the M2-like, pro-tumor phenotype by flow cytometry cell surface marker analysis. By qRT-PCR, flow cytometry, and Western blot, we detected greater MerTK expression in M2 than M1 macrophages. Targeting MerTK with antibody Mer590 decreased LNCaP efferocytosis by M2 HMDMs, establishing the role of MerTK in prostate cancer efferocytosis. In the prostate cancer mouse model hi-myc, Mertk KO increased anti-tumor immune infiltrate including CD8 T cells. These findings support targeting MerTK-mediated efferocytosis as a novel therapy for prostate cancer.
    MeSH term(s) Animals ; Mice ; Male ; Humans ; c-Mer Tyrosine Kinase ; Prostatic Neoplasms ; Phagocytosis ; Macrophages ; Prostate ; Tumor Microenvironment
    Chemical Substances c-Mer Tyrosine Kinase (EC 2.7.10.1)
    Language English
    Publishing date 2023-08-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1201189-7
    ISSN 1559-131X ; 0736-0118 ; 1357-0560
    ISSN (online) 1559-131X
    ISSN 0736-0118 ; 1357-0560
    DOI 10.1007/s12032-023-02153-z
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  10. Article ; Online: Exploring Characteristics of Academic General Surgery Residency Applicants: A Group Concept-Mapping Approach.

    Althans, Alison R / Thompson, Jessica R / Rosas, Scott R / Burke, Jessica G / Lee, Kenneth K / Diego, Emilia J / Rosengart, Matthew R / Myers, Sara P

    Journal of surgical education

    2022  Volume 79, Issue 6, Page(s) 1342–1352

    Abstract: Objective: Holistic review, which emphasizes qualitative attributes over objective measures, has been proposed as a method for selecting candidates for surgical residency in order to improve diversity in graduate medical education, and, ultimately, the ... ...

    Abstract Objective: Holistic review, which emphasizes qualitative attributes over objective measures, has been proposed as a method for selecting candidates for surgical residency in order to improve diversity in graduate medical education, and, ultimately, the field of surgery. This study seeks to articulate desirable traits of applicants as a first-step in standardizing the holistic review process.
    Design: Using Group Concept Mapping, a web-based mixed-methods participatory research methodology, residency selection committee members were asked to 1) list desirable characteristics of applicants, 2) group these into categories, 3) rate their importance to academic/clinical success on a 5-point Likert scale (1 = not at all important, 5 = extremely important), and 4) rate the degree to which each characteristic is feasible to assess on a 3-point Likert scale (1 = not at all feasible, 3 = very feasible). Grouped characteristics submitted to hierarchical cluster analysis depicted committee's consensus about desirable qualities/criteria for applicants. Bivariate scatter-plots and pattern-matching graphics demonstrated which of these criteria were most important and reliably assessed.
    Setting: A single academic general surgery residency training program in Western Pennsylvania.
    Participants: Members of the selection committee for the UPMC General Surgery Residency program who had participated in at least 1 prior cycle of applicant selection.
    Results: Desirable characteristics of highly qualified applicants into an academic general surgery residency were clustered into domains of 1) scholarly work and research, 2) grades/formal assessments, 3) program fit, 4) behavioral assets, and 5) aspiration. Behavioral assets, which was felt to be the most important to clinical and academic success were considered to be the least feasible to reliably assess. Within this domain, initiative, being self-motivated, intellectual curiosity, work ethic, communication skills, maturity and self-awareness, and thoughtfulness were viewed as most frequently reliably assessed from the application and interview process.
    Conclusions: High quality applicants possess several behavioral assets that faculty deem are important to academic and clinical success. Adapting validated metrics for assessing these assets, may provide a solution for addressing subjectivity and other challenges scrutinized by critics of holistic review.
    MeSH term(s) Humans ; Internship and Residency ; Personnel Selection/methods ; Education, Medical, Graduate ; Academic Success ; Aptitude ; General Surgery/education
    Language English
    Publishing date 2022-07-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2277538-9
    ISSN 1878-7452 ; 1931-7204
    ISSN (online) 1878-7452
    ISSN 1931-7204
    DOI 10.1016/j.jsurg.2022.06.005
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