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Americans continue to consume high amounts of sodium. Potassium is notable for its blood pressure lowering effects but less is known regarding its effect on the vasculature. This investigation seeks to determine the role of dietary potassium on the vasculature in the presence of a high sodium diet in salt-resistant adults.
Current approaches in primary prevention for cardiovascular disease are based on probabilistic approaches to estimate risk, using many of the widely available cardiovascular risks scores, with over 100 such scoring systems currently available throughout the world. The rationale for this practice is to select those individuals at greatest risk for more intense targets, reduce risk of treatment to those at minimal risk, and to maximize the cost-effectiveness of treatment. A recent Cochrane Systematic Review assessed the practice of using risk scores to select individuals for the primary prevention of cardiovascular disease. 3 The principal finding of the systematic review was that there was little or no effect of providing clinicians with cardiovascular risk scores when compared to standard of care (5.4% versus 5.3%; relative risk 1.01, 95% confidence intervals 0.95 to 1.08). The authors concluded that there is major uncertainty whether current strategies for providing risk scores and called for further research to address this concern. Extent of coronary artery calcium (CAC) is a strong risk marker for coronary events, with evidence mainly derived from observational studies and from prospective non-randomized studies. CAC, although endorsed for intermediate risk patients, is not widely adopted due to barriers in reimbursement. The cost of the test ranges between 100 and 300 USD in the United States, which may have limited the wide adoption of the test. Whether reducing the cost burden for CAC increases utilization for routine screening and its influence on physician practices and downstream testing is largely unknown. University Hospitals started offering low charge CAC (99$) since 2014. In 2017, University Hospitals started offering CAC for no charge for patients to improve access to this test, which has not traditionally been covered by insurance companies. The impact of no-charge CAC has never been studied.
This study will test whether potassium supplementation can reduce the deleterious effect of a high sodium diet on blood vessel function, blood pressure reactivity and autonomic nervous system function in apparently healthy adults.
This is a crossover study that will examine use behaviors, chemical exposures, and biological effects of Standardized Research Electronic Cigarette (SREC) compared to usual brand e-cigarette use in natural or synthetic nicotine users.
This study is a mechanistic clinical trial designed to investigate the effects of the circadian system and sleep on non-dipping blood pressure (BP) in people with hypertension (HTN).
ORFAN is a prospective, multi-centre, multi-ethnic cohort observational study collecting CT scans, biological material and outcomes data, to develop and validate novel biomarkers of cardiometabolic and other disease risk.
This research application will explore the impact of the Non-nucleoside reverse transcriptase inhibitor (NNRTI) doravirine in the setting of established Nucleoside reverse transcriptase inhibitors (NRTIs) backbone \[Tenofovir alafenamide (TAF) / Emtricitabine (FTC) as a possible therapeutic strategy to minimize the detrimental impact of ART-related toxicities on metabolism and instigators of atherosclerosis. Given the possible favorable role of NNRTI in pathogenesis of HIV-related dyslipidemia and cardiovascular disease (CVD), this research will provide mechanistic insights into HIV pathogenesis and safety data regarding doravirine (DOR). These data may promote DOR as a robust "HDL friendly" and "metabolism friendly", therapeutic agent that may attenuate morbidity in chronic treated HIV infection. Towards this aim, the investigators will study DOR-related effects on HDL (HDL-C levels and function) and ex vivo assays that determine key molecular determinants of atherogenesis.
This is a cross-sectional study with an optional intervention that will examine how extreme sleep durations relate to cardiovascular health, physical activity, and sleep quality by studying three groups of participants: short sleepers (≤ 6 hrs), long sleepers (≥ 9 hrs), and average duration sleepers (7-8 hrs). The optional intervention asks participants to maintain an 8-hour per night regular sleep schedule for one week.
Black individuals are at increased cardiovascular disease risk. The central goal of the study is to determine if mitochondrial reactive oxygen species influence blood vessel function and nervous system regulation of blood pressure differentially in black, compared to white individuals. These findings may help to explain a potential mechanism that contributes to racial disparities in blood pressure and cardiovascular disease risk. A secondary goal is to determine if mitochondrial reactive oxygen species improves blood pressure and vascular function in individuals with elevated blood pressure and stage 1 hypertension.
This IRB will cover a current clinical trial (NCT04244604) that was started at Auburn University (AU IRB#19-390), the Principal Investigator's prior institution, and is supported by his NIH Career Development Award (NHLBI K01HL147998). About nine out of ten Americans overconsume dietary salt. Compared to other racial groups, Black individuals are more prone to salt-sensitive hypertension and negative cardiovascular conditions associated with high salt intake. However, there is a critical need to determine the reasons behind and mechanisms that contribute to these racial disparities. Both acute (single meal) and chronic high-dietary sodium cause small but important increases in blood sodium concentration that are associated with altered blood pressure regulation and blood vessel dysfunction. However, racial differences in these measures have not been examined. This is important because Black individuals generally exhibit lower circulating concentrations of hormones (e.g., renin, aldosterone, angiotensin 2) that buffer changes in body sodium to regulate blood pressure, and this could make them more vulnerable to the negative effects of a high-sodium meal. Therefore, the purpose of this study is to determine whether there are racial differences in blood pressure regulation and blood flow after a high-sodium meal. The investigators will assess blood pressure regulation, blood vessel stiffness, and the blood vessel's ability to dilate before and after a high-salt meal and a low-salt control meal (both meals are low-salt tomato soup with varied added salt). The investigators will also collect blood and urine to measure sodium and determine biochemical changes that may be contributing to racial differences in cardiovascular function.