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- Creators: School of Life Sciences
Description
Controlled release formulations for local, in vivo drug delivery are of growing interest to device manufacturers, research scientists, and clinicians; however, most research characterizing controlled release formulations occurs in vitro because the spatial and temporal distribution of drug delivery is difficult to measure in vivo. In this work, in vivo magnetic resonance imaging (MRI) of local drug delivery is performed to visualize and quantify the time resolved distribution of MRI contrast agents. I find it is possible to visualize contrast agent distributions in near real time from local delivery vehicles using MRI. Three dimensional T1 maps are processed to produce in vivo concentration maps of contrast agent for individual animal models. The method for obtaining concentration maps is analyzed to estimate errors introduced at various steps in the process. The method is used to evaluate different controlled release vehicles, vehicle placement, and type of surgical wound in rabbits as a model for antimicrobial delivery to orthopaedic infection sites. I are able to see differences between all these factors; however, all images show that contrast agent remains fairly local to the wound site and do not distribute to tissues far from the implant in therapeutic concentrations. I also produce a mathematical model that investigates important mechanisms in the transport of antimicrobials in a wound environment. It is determined from both the images and the mathematical model that antimicrobial distribution in an orthopaedic wounds is dependent on both diffusive and convective mechanisms. Furthermore, I began development of MRI visible therapeutic agents to examine active drug distributions. I hypothesize that this work can be developed into a non-invasive, patient specific, clinical tool to evaluate the success of interventional procedures using local drug delivery vehicles.
ContributorsGiers, Morgan (Author) / Caplan, Michael R (Thesis advisor) / Massia, Stephen P (Committee member) / Frakes, David (Committee member) / McLaren, Alex C. (Committee member) / Vernon, Brent L (Committee member) / Arizona State University (Publisher)
Created2013
Description
In the years following the HIV epidemic, much has changed in the way of public health, the social epidemic of stigma has remained. It is the assertion of the authors that stigma can be combatted through the propagation of accurate education and exposure to the lasting negative impacts of social stigma on persons living with HIV in the United States at present. Although individuals who are not apart of this community cannot truly understand the impacts of HIV-related stigma on those directly impacted by it, a sense of understanding and compassion may be elicited through the breakdown of social stigma into comprehensible components and the provision of stigma-inspired artwork. In addition to providing a background on the scientific basis of Human immunodeficiency virus and its spread, the authors have elected to utilize public engagement by means of an anonymous survey as well as personal interactions with HIV advocates to synthesize paintings. Responses were collected from approximately 300 survey participants via social media with no demographic information collected. It was the hope of the authors that the lack of identifying questions may prompt participants to answer freely and honestly to improve overall understanding of social perceptions of HIV and its related stigma. These paintings and resources deemed appropriate based on the results of the aforementioned survey are to be displayed on a webpage for easier access and engagement with a broader audience.Moreover, this webpage is intended to be maintained and utilized beyond the timeframe of this Undergraduate Honors Thesis for the intended purpose of promoting stigma-free HIV advocacy and education.
ContributorsRidgley, Nathan Laurence (Co-author) / Luigs, Stephanie (Co-author) / Jacobs, Bertram (Thesis director) / Salamone, Damien (Committee member) / Spencer, Glen (Committee member) / School of Molecular Sciences (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
This thesis is a retrospective study analyzing data from patient implanted cardiac devices in order to determine the effect of SARS-CoV-2 on cardiac arrhythmias. This study is also the first, to the knowledge of the researchers, in which a cohort of undifferentiated hospitalized and non-hospitalized COVID patients were studied using data from cardiac implanted devices. The results from this study has shown that SARS-CoV-2 leads to statistically significant increases in arrhythmic burden, in particular increased overall arrhythmic episodes, increased VT episodes, increased AT Burden percent, and increased SVT Average Ventricular Rate, and a statistically significant decrease in VT Average Ventricular Rate.
ContributorsGomez, Mia (Author) / Ahmed, Aamina (Co-author) / Ross, Heather (Thesis director) / Kleinhans, Amy (Committee member) / Doshi, Rahul (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor)
Created2022-05
Description
This thesis is a retrospective study analyzing data from patient implanted cardiac devices in other to determine the effect of SARS-CoV-2 on cardiac arrhythmias. This study is also the first, to the knowledge of the researchers, in which a cohort of undifferentiated hospitalized and non-hospitalized COVID patients were studied using data from cardiac implanted devices. The results from this study has shown that SARS-CoV-2 leads to statistically significant increases in arrhythmic burden, in particular increased overall arrhythmic episodes, increased VT episodes, increased AT Burden percent, and increased SVT Average Ventricular Rate, and a statistically significant decrease in VT Average Ventricular Rate.
ContributorsAhmed, Aamina (Author) / Gomez, Mia (Co-author) / Ross, Heather (Thesis director) / Kleinhans, Amy (Committee member) / Doshi, Rahul (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor)
Created2022-05