Clinical Research Directory

Nailfold Capillaroscopy and Endothelial Biomarkers in Healthcare Workers Exposed to Chronic Low-Dose Ionizing Radiation

Chronic occupational exposure to low-dose ionizing radiation may lead to subclinical endothelial dysfunction and early microvascular alterations in healthcare workers. Nailfold capillaroscopy is a non-invasive method that allows direct visualization of microcirculatory changes. This observational study aims to evaluate microvascular alterations using nailfold capillaroscopy and to assess their association with serum endothelial and inflammatory biomarkers, including asymmetric dimethylarginine (ADMA), von Willebrand factor (vWF), high-sensitivity C-reactive protein (hs-CRP), and D-dimer levels. Healthcare workers with chronic low-dose radiation exposure will be compared with non-exposed controls. The study seeks to improve understanding of early vascular effects of occupational radiation exposure.

Palmitic Acid and Human Microvascular Function

The goal of this study is to learn how a supplement Quercetin can affect microvascular function. Participants will: * give two blood draws of 5 mL each * have a camera placed under the tongue to take pictures of blood vessels * have 2 laser Doppler microdialysis catheters placed on the forearm to monitor blood vessels before and after local drug infusion Researchers will compare blood vessel function of those who take estrogen supplements to those who do not.

Comprehensive Coronary Physiology in Patients With Angina With Nonobstructive Coronary Arteries - Czech Republic

Coronary artery disease (CAD) is a leading cause of morbidity and mortality. While cardiologists have been focused on discrete, visible stenoses of coronary arteries, there is increasing awareness of the importance of microcirculation and vasospastic disorders in causing angina. The microvascular bed is composed of vessels smaller than 400 microns in diameter. Their network is significantly larger than that of the epicardial vessels and serves essential functions, including regulating myocardial blood flow and cellular metabolism. Angina pectoris, a most frequent symptom of CAD or myocardial ischemia, was assumed to be caused by significant stenosis of the epicardial coronary artery. However, it was found that in over 50% of cases, there was no obstructive CAD, which is described as angina with no obstructive coronary arteries (ANOCA) or ischemia with no obstructive coronary arteries (INOCA), according to the clinical setting.

Cardiac Magnetic Resonance Stress-perfusion Study in Patinets with Fontan Circulation

Univentricular heart (UVH) is a severe congenital heart disease. Accurate advanced non-invasive diagnostic methods is limited. Cardiovascular magnetic resonance (CMR) imaging has evolved as a particularly useful tool for the study of patients with adult congenital heart disease (ACHD) considering its ability to determine detailed anatomy and detect early cardiac dysfunction without the need for radiation exposure. Most of contemporary treatment recommendations are based on consensus opinions/documents and small studies from local, or national registries. Improved knowledge is needed in all these areas to facilitate clinical decisions regarding treatment, monitoring and follow-up. This study seeks to answer if early detection of deterioration in cardiac function, venous pressure and microvascular dysfunction can identify patients before the symptoms progress and thus help to initiate early treatment. The hypothesis is that quantitative myocardial stress-perfusion maps improves the pathophysiological insight in patients with UVH. The overall goal with this research proposal is to implement combined advanced CMR imaging for a comprehensive non-invasive mapping of functional cardiovascular behavior in patients with complex UVH disease. The outcome of this research may benefit this young adult patient population due to early detection of cardiac disease, less hospitalizations because of heart failure, and eventually decrease morbidity and mortality.

Mainz Intracoronary Database. The Coronary Slow-flow and Microvascular Diseases Registry

Primary goal of the registry is to collect prospective data on patients undergoing coronary angiography in Mainz. Following amendment of the procol, this study will also include patients who received an Aborb bioresorbable scaffold for the therapy of de novo stenoses.