Active clinical trials for "Vascular Diseases"

The purpose of this study is to test whether sodium nitrite affects the expression of cellular proteins important for metabolic and vascular function in vascular offcuts and cardiac biopsies taken from patients undergoing coronary artery bypass grafting (CABG) surgery.

This study evaluates the safety, feasibility and usability of a SaeboGlove rehabilitation device in the treatment of patients who have reduced ability to open their hand due to weakness after an acute stroke.

Contactless and widely available health monitoring technologies are of growing interest in the context of the worldwide COVID-19 pandemic. Remote photoplethysmography (rPPG) is a well-studied technology that interprets variations in skin colour related to blood flow which, when analysed with complex mathematical algorithm, generates vital sign readings. This technology has been refined and embedded in a smartphone app designed to acquire heart rate, respiratory rate and oxygen saturation using a front-facing smartphone camera. Preliminary data comparing the accuracy of smartphone rPPG readings with conventional vital sign monitor readings are promising; however, less than 5% of the population studied in the app development phase had oxygen saturation levels below 95% making it impossible to ensure reliability in these populations. The goal of this study is to compare readings acquired using this rPPG app with the readings from hospital grade, Health Canada approved vital signs monitors used in healthcare settings with a focus on subject with low oxygen saturations. We will also study other sociodemographic and clinical features that may influence the accuracy of the readings. This will be achieved by recruiting consenting adults presenting to care in acute care settings and a designated COVID outpatient clinic. Vital signs will be acquired using the rPPG app and conventional hospital vital sign monitors simultaneously. Readings will be repeated within 2-5 minutes when time permits. Statistical analysis will be performed to analyze the findings and determine the accuracy and precision of the rPPG app readings. It is expected that the vital sign readings acquired with the rPPG app will be almost identical to those acquired using hospital-grade monitors for all subjects regardless of age, gender, skin colour, COVID status and relevant comorbidities.

Many acute and chronical medical conditions, such as, shock, sepsis, diabetes, hypertonia, and cardiovascular disease are associated with a perturbated or lost ability of regulating the diameter of the blood vessels. These changes in regulatory function can be seen especially in the smaller vessels in the body. It is therefore clinically relevant to develop investigation models that can detect and quantify such changes at an early stage. Historically, basic vascular function was investigated by mounting a section of a blood vessel on a tension sensor, submerging it in a temperature controlled and buffered solution to which vasoactive substances were added. This in vitro model has contributed substantially to our current knowledge of vascular pharmacology and function. However, using this method means that the vessel is removed from its natural environment and, hence no longer influenced by systemic or local mediators for controlling vessel diameter. The present study aims to investigate the local changes in blood flow and concentration of red blood cells of the superficial vessels in the skin of the forearm of healthy volunteers in response to various vasoactive substances. The purpose is to better understand how the regulation of diameter works in and to find a model that can give an early warning to when it does not function optimally. The vasoactive substances will be delivered through the skin to the vascular bed by a non-invasive method called iontophoresis. An electrode chamber containing a solution of the substance to be studied is placed on the subject's skin by double adhesive tape. The chamber comes with a transparent lid that prevents leakage and enables supervision of the effect on the underlying vasculature. When a voltage is applied the charged drug molecules begin to move through the skin and interact with the vessels. In the present study, a total electrical dose of 12 millicoulomb (mC) is going to be used (600 seconds x 0.02 milliampere). The effect of the applied drug is measured using two non-contact, optical measurement techniques. A better understanding of the pharmacology and regulation of blood vessels may lead to the developement of techniques that allow earlier detection of perturbations in vessel regulation and the onset of preventive medical treatment.

Introduction: Williams-Beuren syndrome is a rare genetic disorder caused by a 7q11.23 microdeletion. The phenotype associates vasculopathy (arterial stenosis, hypertension), dimorphism and intellectual disability. Microdeletion includes several genes: ELN encodes for elastin and the haplo-insufficiency (only 1 functional copy) causes vasculopathy. The primary objective is to quantify plasma and urinary levels of elastin peptides in Williams-Beuren patients and 7q11.23 micro-duplication syndrome patients in order to correlate the levels of these markers with the number of copies of ELN gene (proportional positive relationship "gene copy number - circulating levels of markers) Materials and Methods: This prospective study will be carried out in Lyon at the "Hôpital Femme-Mère-Enfant" for 2 years. 3 groups of patients will be studied: Williams-Beuren patients (N=20), micro-duplication 7q11.23 syndrome patients (N=10) and healthy patients (N=60). Subjects will be followed for 1 day. Clinical examination (weight, height, blood pressure) and biological sample collection (blood and urine sample) will be carry out for Williams Beuren and micro-duplication 7q11.23 patients group. A large majority of visits will be part of patients' usual care. A large part of patients are systematically seen in consultation once a year. For healthy group, only biological sample collection will be carry out. The PE concentrations will be assessed and compared between the three groups of patients.

The aim of the current study is to compare virtual clinic visits (i.e., real-time, face-to-face visits conducted over the internet with tablet devices) to actual physical clinic visits. After both types of visits (virtual versus physical) physicians will be asked to classify patients into low, moderate or high risk for a vascular intervention. It is hypothesized that there will be good agreement between classifications made after the virtual visits as compared to those made after physical visits. That is, virtual visit classifications will be as good as those made after physical visits.

A single-center, prospective, cohort analysis of the Femoral Introducer Sheath and Hemostasis (FISH) vascular closure device will study 100 consecutive patients on which the device will be used to close the femoral artery after angiogram and/or endovascular procedure. Study will be conducted in order to establish the level of comfort and confidence that this device provides for both patients and physician in terms of hemodynamic and usage outcomes.

The objective of this study is to evaluate an antibiotic therapy called Rifalazil to determine its effect on hardening of the carotid arteries.

The purpose of this study is to investigate whether there is an association between stroke or heart attack and reactivation of varicella zoster virus, measured by antibody levels, using linked data from the Health Survey for England and secondary care.

This study will evaluate real-world performance of the CorPath GRX System in peripheral vascular interventions.