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Full-Text Articles in Engineering
An In Vitro Investigation Of Urothelial Cell Function In Response To Hypoxia And Pressure In Relation To Bladder Outlet Obstruction, Britney Hudson
An In Vitro Investigation Of Urothelial Cell Function In Response To Hypoxia And Pressure In Relation To Bladder Outlet Obstruction, Britney Hudson
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Bladder outlet obstruction (BOO) is a prevalent urological condition and can be characterized by the presence of lower urinary tract symptoms (LUTS), such as hesitancy, weak stream, and nocturia. The main cause of BOO is a partial blockage of the urethra, which results in elevated voiding pressure, high storage pressure, and tissue ischemia, which are thought to be the triggers of bladder inflammation and subsequent fibrosis. Often patients do not seek treatment until the conditions get severe. Thus, it would be ideal to have an early diagnostic tool to detect changes in the bladder due to BOO. Extracellular vesicles (EVs) …
A Real-Time Programmable Pulsatile Flow Pump For In Vitro Cardiovascular Experimentation, Rahul Raj Mechoor, Tyler Schmidt, Ethan Kung
A Real-Time Programmable Pulsatile Flow Pump For In Vitro Cardiovascular Experimentation, Rahul Raj Mechoor, Tyler Schmidt, Ethan Kung
Publications
Benchtop in vitro experiments are valuable tools for investigating the cardiovascular system and testing medical devices. Accurate reproduction of the physiologic flow waveforms at various anatomic locations is an important component of these experimental methods. This study discusses the design, construction, and testing of a low-cost and fully programmable pulsatile flow pump capable of continuously producing unlimited cycles of physiologic waveforms. It consists of a gear pump actuated by an AC servomotor and a feedback algorithm to achieve highly accurate reproduction of flow waveforms for flow rates up to 300 ml/s across a range of loading conditions. The iterative feedback …
A Simulation Protocol For Exercise Physiology In Fontan Patients Using A Closed Loop Lumped-Parameter Model, Ethan Kung, Giancarlo Pennati, Francesco Migliavacca, Tian-Yen Hsia, Richard Figliola, Alison Marsden, Alessandro Giardini
A Simulation Protocol For Exercise Physiology In Fontan Patients Using A Closed Loop Lumped-Parameter Model, Ethan Kung, Giancarlo Pennati, Francesco Migliavacca, Tian-Yen Hsia, Richard Figliola, Alison Marsden, Alessandro Giardini
Publications
Background: Reduced exercise capacity is nearly universal among Fontan patients, though its etiology is not yet fully understood. While previous computational studies have attempted to model Fontan exercise, they did not fully account for global physiologic mechanisms nor directly compare results against clinical and physiologic data. Methods: In this study, we developed a protocol to simulate Fontan lower-body exercise using a closed-loop lumped-parameter model describing the entire circulation. We analyzed clinical exercise data from a cohort of Fontan patients, incorporated previous clinical findings from literature, quantified a comprehensive list of physiological changes during exercise, translated them into a computational model …
Investigating The Role Of Mechanosensitive Ion Channels In Urothelial Cell Pressure Mechanotransduction, Shawn Olsen
Investigating The Role Of Mechanosensitive Ion Channels In Urothelial Cell Pressure Mechanotransduction, Shawn Olsen
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Overactive bladder (OAB) is a bladder disorder that is characterized by bladder storage symptoms of urgency with or without urge incontinence, frequency, nocturia, and, as of 2003, affected approximately 16.5% of adults in the United States with an annual treatment cost of over $65 billion. While therapies are available to mitigate the symptoms of OAB, there are no treatments for the cause of OAB, due to the lack of understanding of the etiology of the disorder. Recent research has provided evidence that the bladder urothelium is not just a passive barrier, but is also sensitive to various chemical and mechanical …