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SHAREOK communities — full text, open access, and freely citable.

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University of Oklahoma
Norman, Oklahoma · Est. 1890
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University of Central Oklahoma
Edmond, Oklahoma · Est. 1890

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42 Communities— Collections

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    Evaluation of Radio Frequency Ablation in Human Left Atrial Tissues for Atrial Fibrillation Using Optical Coherence Tomography
    (2025-09-10) Selvaraj Mercyshalinie, Ebenezar Raj; Patterson, Dylan; Mutembei, Bornface; Ladymon, Avery; Yan, Feng; Pandit, Kaustubh; Peek, Hayden; Fung, Kar-Ming; Zhang, Qinghao; Wang, Chen; Cui, Yan; Liu, Junyuan; Liu, Ronghao; Martins, Paulo N.; Stavrakis, Stravros; Zhang, Ke; Miller, David R.; Tang, Qinggong
    Despite its widespread adoption, the success of radiofrequency (RF) ablation is often limited by challenges in achieving durable, transmural lesions while avoiding complications such as incomplete ablation or over-ablation. Optical coherence tomography (OCT) offers high-resolution visualization of cardiac tissue, enabling real-time assessment of lesion depth. Therefore, we investigated the impact of RF ablation on donated human left atrial tissue using an OCT imaging system to assess lesion formation in a controlled laboratory setting. RF ablation lesions were created at durations of 20, 40, 60, 80, and 100 seconds (s), and their effects were quantified by calculating the attenuation coefficient from OCT images. To identify tissue regions in the image, a U-Net model was employed for segmentation, achieving a mean intersection over union (IoU) of 0.9748 with an inference time of 82 milliseconds. Our results demonstrated clear differences in tissue response before and after ablation, with distinct lesion characteristics across the tested durations. One-way ANOVA analysis yielded a p-value of 1.09 × 10−8, confirming statistically significant differences among the ablation durations. These findings highlight the potential of SD-OCT for precise, real-time monitoring of ablation effects. Future work aims to integrate OCT with ablation catheters for clinical applications, enhancing the precision of catheter-based treatments for conditions like atrial fibrillation.
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    Item type:Item, Access status: Open Access ,
    Media constructions of gendered helplessness and the decentring of women in Lagos slums during the COVID 19 pandemic
    (2026-09-17) Tommy, Solomon; Ogwezzy-Ndisika, Abigail O.; Faustino, Babatunde Adeshina; Aleshinloye, Oluwaseun
    The COVID-19 pandemic emphasized long-standing social disparities, including the marginalization of disadvantaged populations in popular media coverage and narratives. This study investigates this, examining how Nigerian media coverage of resilience realities in Lagos slums in the wake of the pandemic positioned the response of slum-dwelling women, with critical attention given to the intersection of vulnerability and agency. Grounded in framing theory, feminist perspectives and development media theory, the study adopted a qualitative content analysis of news reports from January 2020 to October 2021. Findings showed a significant under-representation of women-centered, slum-based adaptive activities when compared to the full population of slum-based pandemic coverage, with narratives disproportionately focused on official/institutional and male voices. Consequently, women were relegated to narratives of passive victimhood and dependency in media frames, with helplessness gendered to women’s disadvantage, effectively diminishing their roles as community leaders and economic actors. These disempowering depictions emphasise prevalent class-based power dynamics, especially as regards women, while also delegitimizing slum residents’ contributions to urban resilience, which informs the call for increased inclusiveness in dominant media narratives.
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    Item type:Item, Access status: Open Access ,
    FOL Newsletter 2021 - Fall
    UCO Friends of Chambers Library
    The newsletter of UCO Chambers Library's Friends of the Library, published twice a year in spring and fall.
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    Item type:Item, Access status: Open Access ,
    FOL Newsletter 2022 - Spring
    UCO Friends of Chambers Library
    The newsletter of UCO Chambers Library's Friends of the Library, published twice a year in spring and fall.
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    Item type:Item, Access status: Open Access ,
    FOL Newsletter 2023 - Spring
    UCO Friends of Chambers Library
    The newsletter of UCO Chambers Library's Friends of the Library, published twice a year in spring and fall.

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