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Articles 1 - 16 of 16
Full-Text Articles in Medicine and Health Sciences
Illness Perceptions And Health-Promoting Behaviors: The Buffering Role Of Resilience In Adults With Congenital Heart Disease, Taylor Rose Eldridge
Illness Perceptions And Health-Promoting Behaviors: The Buffering Role Of Resilience In Adults With Congenital Heart Disease, Taylor Rose Eldridge
Electronic Theses and Dissertations
Congenital heart defects (CHD) are one of the most prevalent genetic abnormalities, impacting the lives of millions of children, teens, and young adults. Conservative diagnoses estimate that 2.4 million children and adults are living with CHD in the United States (Gilboa et al., 2016). CHD requires consistent cardiac support with multiple surgeries and hospitalizations expected throughout the lifetime, which significantly impacts psychological health. Specifically, patients present with a host of extra-cardiac conditions that impact their quality of life. With advancements in medical technology, mortality rates continue to improve for this population; however, individuals face a number of consequences that impact …
Metabolic Foundations Of Exercise-Induced Cardiac Growth., Kyle Fulghum
Metabolic Foundations Of Exercise-Induced Cardiac Growth., Kyle Fulghum
Electronic Theses and Dissertations
Regular aerobic exercise promotes physiological cardiac growth, which is an adaptive response thought to enable the heart to meet higher physical demands. Cardiac growth involves coordination of catabolic and anabolic activities to support ATP generation, macromolecule biosynthesis, and myocyte hypertrophy. Although previous studies suggest that exercise-induced reductions in cardiac glycolysis are critical for physiological myocyte hypertrophy, it remains unclear how exercise influences the many interlinked pathways of metabolism that support adaptive remodeling of the heart. In this thesis project, we tested the general hypothesis that aerobic exercise promotes physiological cardiac growth by coordinating myocardial metabolism to promote glucose-supported anabolic pathway …
Primary Cilia Of The Cardiac Neural Crest & Hedgehog-Mediated Mechanisms Of Congenital Heart Disease, Lindsey A. Fitzsimons
Primary Cilia Of The Cardiac Neural Crest & Hedgehog-Mediated Mechanisms Of Congenital Heart Disease, Lindsey A. Fitzsimons
Electronic Theses and Dissertations
Elimination of primary cilia in cardiac neural crest cell (CNCC) progenitors is hypothesized to cause a variety of congenital heart defects (CHDs), including atrioventricular septal defects, and malformations of the developing cardiac outflow tract. We present an in vivo model of CHD resulting from the conditional elimination of primary cilia from CNCC using multiple, Wnt1:Cre-loxP, neural crest-specific systems, targeting two distinctive, but critical, primary cilia structural genes: Intraflagellar transport protein 88 (Ift88) or kinesin family member 3A (Kif3a). CNCC loss of primary cilia leads to widespread CHD, where homozygous mutant embryos (MUT) display a variety of outflow tract malformations, septation …
Identifying The Cardiovascular Effects Of Multiple Pollutants., Katlyn Elizabeth Mcgraw
Identifying The Cardiovascular Effects Of Multiple Pollutants., Katlyn Elizabeth Mcgraw
Electronic Theses and Dissertations
Cardiovascular disease (CVD) is the leading cause of death from environmental exposures. Although exposure to PM2.5 is an established risk factor for CVD, the contribution of other hazardous pollutant exposure to CVD is less clear. Overall, this work aimed to examine the effect of pollutants with lesser documented effects on cardiovascular disease using a multi-pronged approach to exposure assessment. The three aims were to examine the relationship between county-level toxic chemical releases and CVD mortality in the contiguous United States between 2002 and 2012, to assess the relationship between individual-level VOC metabolites and vascular function, and to build multipollutant …
Athletics As A Life Curriculum: Lessons Learned Through Different Aspects Of Athletics, Thomas J. Davis
Athletics As A Life Curriculum: Lessons Learned Through Different Aspects Of Athletics, Thomas J. Davis
Electronic Theses and Dissertations
For my dissertation, I decided to write a memoir to have the opportunity to go through the self-reflection process and learn more about my inner self. I wanted to learn how the life experiences I write about have affected me as a student-athlete, coach, teacher, parent, and how they have shaped me into who I am today. I took instances from my life in athletics that I believe are significant in the development of my overall being. Educational scholars such as William Pinar (1995, 2004), John Dewey (1916/2019, 1933), Frederic Gros (2011), Immanuel Kant (1908/2015), Nel Noddings (2005), and Paulo …
Health Insurance Plan Design And Chronic Disease Management, Daniel E. Feldman
Health Insurance Plan Design And Chronic Disease Management, Daniel E. Feldman
Electronic Theses and Dissertations
Each year, Americans spend more money on health care than any other industrialized nation, despite comparable mortality rates for people with risk factors for heart disease. The reasons for this lack of health care value in the US are numerous and complex – including market distortions like supplier-inflated pricing and regulatory structures that enable consumers to utilize ubiquitous, high-cost medical technologies that yield uncertain benefits. Health insurance, once thought to be an insignificant contributor to rising health spending, has changed considerably in the past few decades in ways that make it more accessible and more generous in coverage. Health insurance …
The Effects Of Nicotine And Cigarette Smoking On Cardiac Electrophysiology., Affan B. Irfan
The Effects Of Nicotine And Cigarette Smoking On Cardiac Electrophysiology., Affan B. Irfan
Electronic Theses and Dissertations
Cigarette smoking is a leading cause of preventable disease and premature death worldwide. The adverse effects of cigarette smoking, including proarrhythmia, are related to the mixture of chemicals, including nicotine (which sustains tobacco addiction). However, it remains unclear which individual tobacco smoke constituents and biological pathways mediate this increased risk. The purpose of this research was to explore the chronic effects of cigarette smoking, as well as compare the acute effects of nicotine and cigarette smoking, and the possible role of β-adrenoreceptors, on human cardiac electrophysiology. Chapter 1 is a comprehensive literature review of (a) the ex vivo and in …
Bayesian Analytical Approaches For Metabolomics : A Novel Method For Molecular Structure-Informed Metabolite Interaction Modeling, A Novel Diagnostic Model For Differentiating Myocardial Infarction Type, And Approaches For Compound Identification Given Mass Spectrometry Data., Patrick J. Trainor
Electronic Theses and Dissertations
Metabolomics, the study of small molecules in biological systems, has enjoyed great success in enabling researchers to examine disease-associated metabolic dysregulation and has been utilized for the discovery biomarkers of disease and phenotypic states. In spite of recent technological advances in the analytical platforms utilized in metabolomics and the proliferation of tools for the analysis of metabolomics data, significant challenges in metabolomics data analyses remain. In this dissertation, we present three of these challenges and Bayesian methodological solutions for each. In the first part we develop a new methodology to serve a basis for making higher order inferences in metabolomics, …
Patient-Specific Quantification Of The Relationship Between The Left Atrium Pressure And The Ostial Diameter Of The Left Atrial Appendage, Sky Tianqi Gao
Patient-Specific Quantification Of The Relationship Between The Left Atrium Pressure And The Ostial Diameter Of The Left Atrial Appendage, Sky Tianqi Gao
Electronic Theses and Dissertations
The left atrial appendage has been a historically understudied region of the heart until fairly recently with the new understanding of its role in the stroke pathway of patients with atrial fibrillation. The goal of this study is to take a look at the biomechanical behavior of the left atrium and left atrial appendage under normal physiological loading conditions using material properties taken from biaxial stretch tests. Several different options for material properties models were tested and biaxial stretch test data of cadaveric human tissue samples for the left atrium and appendage were fit to a Fung-type strain-energy function for …
Spinal Cord Injury Induced Cardiac Decline And The Limitations Of Exercise., Kathryn Michele Deveau
Spinal Cord Injury Induced Cardiac Decline And The Limitations Of Exercise., Kathryn Michele Deveau
Electronic Theses and Dissertations
There is a general consensus that the level and the severity of spinal cord injury (SCI) impacts chronic cardiac abnormalities such that high thoracic and cervical SCI are the most severely affected. Furthermore, the extreme degree of immobility/inactivity experienced by the persons with SCI has implications on cardiac decline. Yet it has been difficult to separate the relative contributions of the decentralized autonomic nervous system (ANS) and the immediate and profound inactivity to chronic cardiac abnormalities. As such, this body of work sought to characterize a contusion SCI that results in persistent CV dysfunction. Echocardiography, Dobutamine stress echocardiography and pressure …
Enhancing Cell Therapy For Ischemic Cardiomyopathy., Michael J. Book
Enhancing Cell Therapy For Ischemic Cardiomyopathy., Michael J. Book
Electronic Theses and Dissertations
Cardiac cell therapy using cardiac mesenchymal cells (CMC) significantly reduces ventricular dysfunction in patients with ischemic cardiomyopathy. Despite the improvement in function, a modest number of CMCs survive in the heart post-transplantation. In this study, we sought to improve the survival and retention of transplanted CMCs to prolong the therapeutic benefits afforded by cardiac cell therapy. To do this, we targeted the enzyme telomerase (TERT), known to be active in some highly proliferating cells (e.g. germ, stem). TERT is responsible for preventing telomere attrition, thereby allowing continued proliferation. TERT has also been shown to be protective, improve cell migration and …
Evaluating Cardiovascular Dysfunction During Increased Activity And Exercise Rehabilitation Following Incomplete Thoracic Spinal Cord Injury In The Adult Rat., Kathryn A. Harman
Evaluating Cardiovascular Dysfunction During Increased Activity And Exercise Rehabilitation Following Incomplete Thoracic Spinal Cord Injury In The Adult Rat., Kathryn A. Harman
Electronic Theses and Dissertations
Spinal cord injury (SCI) results in whole-body dysfunction. While the majority of SCI research is focused on improving locomotor function after injury, cardiovascular (CV) disease continues to be the leading cause of morbidity in the chronic SCI patient population. The combination of injury-induced destruction of autonomic pathways, maladaptive plasticity within lumbosacral circuits, and the progressive decline in physical fitness contribute to the poor CV status of SCI individuals. Currently, there is little emphasis on implementing appropriately-timed acute rehabilitation techniques aimed to curtail maladaptive remodeling and improve CV outcomes. Furthermore, no pre-clinical or clinical studies have investigated the most appropriate time-course …
Modulation Of Cardiac Kv Currents By Kvbeta2 And Pyridine Nucleotides., Peter Joseph Kilfoil
Modulation Of Cardiac Kv Currents By Kvbeta2 And Pyridine Nucleotides., Peter Joseph Kilfoil
Electronic Theses and Dissertations
Myocardial voltage-gated potassium (Kv) channels regulate the resting membrane potential and the repolarization phase of the action potential. Members of the Kv1 and Kv4 family associate with ancillary subunits, such as the Kvβ proteins, that modify channel kinetics, gating and trafficking. Previous investigation into the function of cardiac β subunits demonstrated that Kvβ1 regulates Ito and IK,slow currents in the heart, but the role of Kvβ2 in the myocardium remains unknown. In heterologous expression systems, Kvβ2 increases surface expression of Kv1 channels, shifts the activation potential of Kv1 channels to more polarized voltages, and increases the inactivation of …
Development Of A Thin-Film Porous-Microelectrode Array (P-Mea) For Electrical Stimulation Of Engineered Cardiac Tissue., Hiren Vrajlal Trada 1977-
Development Of A Thin-Film Porous-Microelectrode Array (P-Mea) For Electrical Stimulation Of Engineered Cardiac Tissue., Hiren Vrajlal Trada 1977-
Electronic Theses and Dissertations
Electrical stimulation has been increasingly used by research groups to enhance and increase maturation of cells in an engineered cardiac tissue (ECT). Current methods are based on using off-the-shelf wires or electrodes to deliver a stimulus voltage to the in-vitro tissue in culture medium. A major issue with this approach is the generation of byproducts in the medium due to the voltage levels required, which are typically in the range of 5V-10V. No solution currently exists that can accomplish electrical stimulation of cells in an ECT at a low voltage level. Therefore, in this study a novel, porous, thinfilm, microelectrode …
Stabilization Of The Cardiac Nervous System During Cardiac Stress Induces Cardioprotection, David D. Gibbons
Stabilization Of The Cardiac Nervous System During Cardiac Stress Induces Cardioprotection, David D. Gibbons
Electronic Theses and Dissertations
The cardiac nervous system consists of nested reflex feedback loops that interact to regulate regional heart function. Cardiac disease affects multiple components of the cardiac nervous system and the myocytes themselves. This study aims to determine: 1) how select components of the cardiac nervous system respond to acute cardiac stress, including myocardial ischemia (MI) and induced neural imbalance leading to cardiac electrical instability, and 2) how neuromodulation can affect neural-myocyte interactions to induce cardioprotection. Thoracic spinal cord stimulation (SCS) is recognized for its anti-anginal effects and ability to reduce apoptosis in response to acute MI, primarily via modulation of adrenergic …
A Study Of The Movements Of The Heart And Their Relationship To The Filling Of The Auricles., John H. Rompf
A Study Of The Movements Of The Heart And Their Relationship To The Filling Of The Auricles., John H. Rompf
Electronic Theses and Dissertations
No abstract provided.