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Extreme heat causes a disproportionate number of hospitalizations and deaths in older adults relative to any other age group. Importantly, many hospitalizations and deaths are primarily due to cardiovascular events such as myocardial infarction. Previous data indicate that older adults have attenuated skin blood flow and sweating responses when exposed to heat, resulting greater increase in core body temperature. Despite these observations, relatively little is known about the risk for myocardial ischemia potentially contributing to the aforementioned higher morbidity and mortality in older adults during heat waves. The broad objective of this work is to determine the impact of ambient heat exposure on myocardial blood flow and flow reserve in young and older adults. Aim 1 will test the hypothesis that older adults exhibit attenuated myocardial flow reserve compared to young adults during heat stress. Aim 2 will determine if the percent of maximal myocardial flow reserve (assess via vasodilator stress) during heat exposure is higher in older adults compared to young adults. The expected outcome from this body of work will improve our understanding of the consequences of aging on cardiovascular responses to ambient heat stress.
The broad, long-term objective of this pilot study is to develop an optimal, clinically usable, non-invasive evaluation of Coronary Artery Disease (CAD) in the setting of stable angina which provides both anatomic and functional information. Patients already scheduled to undergo Invasive coronary catheterization (ICA) for the clinical indication of angina will be recruited to under go stress-rest Positron Emission Tomography-Coronary CT Angiography-Fractional Flow Reserve (PET-cCTA-cFFR)
The investigators seek to test bolus infusions (50ml/min) vs. slow infusions (20 ml/min) of Rb-82 on metrics of coronary blood flow assessed on a modern 3D PET/CT.
Researchers are trying to determine the side effects on the heart from immune checkpoint inhibitor (ICI) treatment in patients with cancer.
Use of novel radio-pharmaceutical Rhodamine 6G to determine myocardial blood flow
We propose to perform PET MPI studies in patients before and after stenting to evaluate changes (or lack thereof) in MBFR and how that is associated with changes (or lack thereof) in symptoms, functional status and quality of life. This will help to understand the role of MBFR in patient selection for coronary angiography and stenting.
This study is being conducted to provide access to and collect test data for an established nuclear medicine diagnostic imaging test called Positron Emission Tomography (PET), using a specific radioactive drug called Ammonia N-13 (Ammonia), referred to simply as an Ammonia PET scan, which is used to visualize the blood flow through the blood vessels and into the heart muscle in order to identify areas of restricted blood flow within the heart. The scanner used in this study may be a stand-alone PET scanner or a PET/CT scanner, which combines the PET scanner and a Computed Tomography (CT) scanner into a single device. Unless otherwise stated in this consent form, the term PET will be used to refer to both stand-alone PET and PET/CT scanners. While physicians have used the Ammonia PET test for many years to visualize (image) the blood flow into the heart muscle (perfusion), it is now possible to also measure the flow of blood into the heart muscle. Research studies have demonstrated clinical value in reviewing the measured blood flow values in addition to reviewing the perfusion images of blood flow into the heart muscle. Therefore, this study will establish a database of a large number of Ammonia PET measured blood flow values to serve as a future reference.
This observational prospective clinical study is to develop software tools to fuse coronary anatomy data obtained from CT coronary angiography with dynamic PET data to noninvasively measure absolute myocardial blood flow, flow reserve and relative flow reserve across specific coronary lesions. Results will be compared to those obtained invasively in the catheterization laboratory.
To establish quantitative values of myocardial blood flow (MBF) in normal, healthy volunteers .
This study hopes to provide significant technical improvement in a Myocardial Blood Flow (MBF) cardiac magnetic resonance (CMR) quantification technique to address challenges and technical limitations for MBF CMR. By developing and validating novel techniques to improve first-pass perfusion (FPP) cardiac MR, we propose to increase diagnostic accuracy by minimizing false positives and false negatives, allow for better evaluation and accurate quantification of total ischemic burden and reduce image and motion-induced artifacts. The broad, long-term objective of the proposed project is to improve the prognosis of patients with myocardial ischemia caused by coronary artery disease (CAD) or coronary microvascular dysfunction (CMD).