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Microvascular Dysfunction clinical trials

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NCT ID: NCT06193980 Recruiting - Sepsis Clinical Trials

Exercise Testing in ICU Survivors to Evaluate ICU-acquired Weakness

Start date: December 15, 2023
Phase:
Study type: Observational

This study aims to investigate how sepsis and shock can impair microcirculation in intensive care unit (ICU) patients, which can lead to long-lasting muscle weakness/dysfunction or ICU-Acquired Weakness (ICU-AW) and exercise limitations.

NCT ID: NCT06046612 Recruiting - Clinical trials for Heart Failure With Preserved Ejection Fraction

Empagliflozin for Peripheral Microvascular Dysfunction in Heart Failure With Preserved Ejection Fraction

Start date: February 13, 2023
Phase: Phase 4
Study type: Interventional

The goal of this low-intervention clinical trial is to learn about the effect of the drug Empagliflozin in patients with heart failure with preserved ejection fraction. The main questions it aims to answer are: - What is the effect of treatment with Empagliflozin after 3 months on peripheral microvascular function - Do clinical correlates for worse microvascular function exist, and thus identify patients that could possibly benefit most from empagliflozin treatment Patients will use Empagliflozin, prescribed by their treating physician. Before the start of treatment and after 3 months they will be asked to - Fill out a quality of life questionnaire - Draw 4 tubes of blood - Undergo non-invasive measurement of the blood flow of the microvasculature in the forearm (using laser speckle contrast analysis)

NCT ID: NCT05671367 Completed - Clinical trials for Hypertrophic Obstructive Cardiomyopathy

Association Between Microvascular Resistance and Outcomes in Patients With Obstructive Hypertrophic Cardiomyopathy

Start date: January 1, 2017
Phase:
Study type: Observational

About 60% of patients with hypertrophic cardiomyopathy have microvascular dysfunction. Microvascular dysfunction is directly related to prognosis in hypertrophic cardiomyopathy. This new measurement method is microcirculation resistance (MR) based on quantitative flow ratio (QFR), which does not need a pressure guide wire on the basis of angiography. The QFR system is used to evaluate the blood vessels distal pressure and blood flow, and their ratio is microcirculation resistance (MR). The quantitative blood flow fraction measurement system was analyzed by interventional laboratory platform image analysis software (AngioPlus 2.0). This study is a single-center retrospective cohort study. Participants were selected from patients who were diagnosed with hypertrophic obstructive cardiomyopathy in Fuwai Hospital from January 2020 to November 2021. The risk factor is whether there is microcirculation resistance disorder. The outcome was the major adverse cardiovascular events related to HCM (including all-cause death, heart transplantation, left ventricular pacemaker, and heart failure readmission) that were followed up one year after angiography. Aim To further clarify whether there is a certain correlation between microvascular resistance and adverse cardiovascular prognosis.

NCT ID: NCT03829046 Completed - Type2 Diabetes Clinical Trials

The Effects of Evolocumab in Patients With Diabetes and Atherosclerotic Vascular Disease

Start date: June 3, 2019
Phase: Phase 4
Study type: Interventional

Experimental models have linked lipid lowering therapies with systemic inflammation; however, relatively little is known about this network in clinical populations and specifically how it changes with PCSK9 inhibition. The eligible subjects will have 6 visits in 13 to 16 weeks and will have Repatha/placebo 140mg subcutaneous every 4 weeks for 3 times since randomization visit, blood tests will be done in each visit to evaluate the effects of evolocumab upon biocellular markers potentially altered by PCSK9 inhibition in a population of type 2 diabetes patients with microvascular dysfunction. Primary Aims: Determine the ACUTE and SHORT-TERM effects of PCSK9 inhibition with evolocumab on biocellular markers of inflammation, immune mediated thrombosis and rheology. The data from this trial will be used to support a clinical trial to assess the role of PCSK9 inhibition in type 2 diabetes patients with cardiac microvascular dysfunction. Secondary Aims: 1. To define the association between PCSK 9 concentrations and immune-related phenotype. 2. To define the association between Lp(a) concentrations, oxidized phospholipids (OxPL), ApoB, biocellular markers of inflammation, tissue factor and immunothrombosis.

NCT ID: NCT03376555 Completed - Clinical trials for Microvascular Dysfunction

Cheese Consumption and Human Microvascular Function

Start date: March 2016
Phase: Phase 1/Phase 2
Study type: Interventional

Increased dairy intake is associated with improved measures of blood vessel health. Dairy cheese, however, is often high in sodium. Dietary sodium can impair blood vessel function. The researchers examine if and how natural cheese may protect against impairments in blood vessel function caused by sodium. For this study, participants complete four 8-day controlled feeding periods in which they eat cheese (6 oz/day) or no cheese during a low-sodium or high-sodium base-diet. The participants complete baseline experiments while on their normal personal diet and then repeat experiments at the end of each controlled feeding period. In some of our experiments, the researchers use a technique called "microdialysis" (MD). With MD, the researchers perfuse some research drugs into the skin on the forearm through tiny tubing that mimics capillaries. These MD drugs mimic or block substances the body naturally makes to control the small blood vessels in the skin. The drugs remain in nickel-sized areas around the tubing and do not go into the rest of the body. The researchers also use a standard technique called "flow mediated dilation" (FMD) that uses blood pressure cuffs and ultrasound to look at the health of larger blood vessels in the body. FMD includes placing a small tablet of nitroglycerin under the tongue during part of the test.

NCT ID: NCT02180178 Recruiting - Clinical trials for Coronary Artery Disease

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

MICAT
Start date: September 2013
Phase:
Study type: Observational [Patient 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.

NCT ID: NCT01931982 Completed - Type 2 Diabetes Clinical Trials

Effect of Glucagon-like Peptide 1 (GLP-1) on Microvascular Myocardial Function in Patients With Type 2 Diabetes.

EGOFIP
Start date: May 2013
Phase: Phase 4
Study type: Interventional

The purpose of the study is to determine if a GLP-1 agonist improves microvascular perfusion in the heart of patients with type 2 diabetes

NCT ID: NCT00797186 Recruiting - Type 2 Diabetes Clinical Trials

Less Invasive Detection and Treatment of Very Early Coronary Artery Disease in Patients With Diabetes Mellitus

Start date: November 2008
Phase: N/A
Study type: Interventional

This protocol focuses on the development of a noninvasive method of early coronary artery disease detection in diabetes. The overall hypothesis is that risk factors for the metabolic syndrome will predict invasive findings on intravascular ultrasound (IVUS) and noninvasive findings on cardiac magnetic resonance (CMR) perfusion imaging. Secondary objectives will include demonstrating the relative importance of individual risk factors early in disease, demonstrating the positive effects of aggressive risk factor modification on disease, demonstrating the relative importance of treatment of individual risk factors on disease progression or stabilization, and that invasive findings on IVUS will predict noninvasive findings with CMR. Such techniques may allow earlier noninvasive detection of disease as well as tailor treatment early in the disease process making prevention more cost effective. The specific aims of this proposal are as follows: 1. To assess whether risk factors for coronary artery disease, both known and novel, predict quantitative and qualitative plaque characteristics on IVUS and alterations in myocardial blood flow on CMR. 2. To assess whether improvements in risk factors through aggressive treatment improve microvascular function as measured by CMR and plaque stabilization and/or regression as measured by IVUS. 3. To assess which risk factors are most predictive early in disease and to demonstrate which risk factors, when treated, provide the most benefit. 4. To assess whether findings on CMR predict findings on IVUS, thus, providing a noninvasive method of early disease detection.

NCT ID: NCT00663520 Completed - Clinical trials for Microvascular Dysfunction

Elucidating the Role of Microvascular Dysfunction in Heart Disease in Women

MVD
Start date: January 2008
Phase:
Study type: Observational

The purpose of this study is to determine if women with chest pain and "clean" heart blood vessels have impaired blood flow to the heart due to problems with the small blood vessels that provide blood and oxygen to the heart. Impairment in the small blood vessels will be tested using ultrasound pictures of the heart, called myocardial contrast echocardiography. Since these small blood vessels are not seen in a coronary angiogram, which is an x-ray of the heart vessels using a dye containing iodine injected in the heart vessels, the problem may remain undiagnosed in women until the heart muscle becomes severely damaged. A second purpose is to identify if there is a common trait in the population of women with this tiny blood vessel dysfunction, which will be investigated by checking blood levels of certain chemical and hormones related to heart disease. Finally, we would like to investigate the relationship between depression and stress, and heart disease. We will do this by measuring cortisol (a hormone that serves as a measure of stress) and administering questionnaires that help to identify depression and stress.