View clinical trials related to Constriction, Pathologic.
Filter by:There is a wealth of evidence implicating the important role of blood flow throughout all stages of the process of atherogenesis. Two locations along the vascular tree at which atherosclerotic plaques are typically found are the carotid artery (CA) and the superficial femoral artery (SFA). Nowadays, ultrasound is the technique of choice for assessing the vascular condition in the CA and SFA. However, clinically used ultrasound techniques show a large variability in estimating the blood flow velocity, due to multiple limitations. With the advent of ultrafast ultrasound imaging, (almost) all elements of the transducer can be activated simultaneously. These so-called plane wave acquisition acquires thousands of images per second and makes continuous tracking of blood flow velocities in all directions in the field of view possible. This high-frame-rate acquisition opened up new possibilities for blood flow imaging at the CA and SFA, such as blood Speckle Tracking (bST) and ultrasound Particle Image Velocimetry (echoPIV). Both these vector flow imaging (VFI) techniques enable the quantification of 2D blood flow velocity profiles, where bST uses no contrast agents compared to echoPIV. Beside these novel ultrasound based techniques, 4D Phase Contrast Magnetic Resonance Imaging (4D flow MRI) enables a non-invasive quantification of the 4D blood flow velocity profiles (3D + time) and can be used as reference standard for blood flow assessments in-vivo. We therefore aim to evaluate the performance of both VFI techniques in comparison to 4D flow MRI measurements in the CA and SFA of healthy volunteers.
Cerebral circulation time in patients with severe carotid artery stenosis was found to be associated with hyperperfusion syndrome. Remote ischemic preconditioning can change the ability of cerebral autoregulation. The prospective, randomized controlled, blind outcome evaluation, multi-center study aimed to investigate the effect of remote ischemic preconditioning on cerebral circulation time in patients with severe carotid artery stenosis.
Internal carotid artery (ICA) is intended to supply blood to brain. The carotid bulb located upstream of ICA origin is prone to atherosclerosis. This is an accumulation of fat and calcium in the wall forming a plaque that gradually thickens and leads to carotid stenosis (CS), which causes a decrease in blood flow. The risk of CS is stroke caused either by carotid artery thrombosis (occlusion) or by atherosclerotic plaque fragmentation, some components of which may leak into the brain (embolism). When diagnosing CS, an Echo-Doppler is performed to determine bulb and ICA origin obstruction rates. The reference method of quantifying CS is based on hemodynamic criteria that only allow the diagnosis of high grade stenosis thresholds (50%-70%). Below 50%, low-grade stenosis, patient follow-up is limited and could be based on morphological criteria; ultrasound imaging being a reference technique for human body structures morphological assessment, especially vessels. Two methods of CS morphological quantification with Doppler ultrasound currently exist. Calibre reduction at the maximum of stenosis can be measured by relating the smallest luminal diameter to the vessel diameter at stenosis site (ECST method) or to the downstream ICA diameter (NASCET method). As bulb diameter measures ≈1.8 times that of ICA, ECST appears to be more suitable for CS quantification. For high-grade stenosis, morphological quantification performance is impaired due to extensive calcification of large atheromatous plaques. However, it is possible that less calcified nature of low-grade stenosis and the use of a rigorous methodology will allow reproducible assessment in routine practice. This technique has not yet been evaluated, although it is a frequent situation in patient follow-up.
This study is aim to disclose the effect of contrast media, which used in epidural steroid injections, on the parameters of thyroid function tests (TFTs). The patients who underwent an epidural steroid injection were included. The investigators hypothesized that contrast media owing to contain iodine may impair the values of TFTs.
Nocturnal calf cramps is a common complaint in patients with lumbar spinal stenosis. The purpose of this study is to evaluate the effect of baclofen in lumbar spinal stenosis patients receiving conservative therapy. We will compare pain score, insomnia severity, functional ability and patient satisfaction between control (conservative management for spinal stenosis) and baclofen group (conservative management for spinal stenosis plus baclofen treatment).
To evaluate the safety and effectiveness of Grency venous stent system in the treatment of iliac vein stenosis or occlusion.
Tracheal stenosis is a serious complication following prolonged intubation. There are important differences in the challenges of airway management. This study consists of our anesthesia management experience in patients with unusual placement of tracheal stenosis due to Covid-19 undergoing tracheal dilatation.
This study aims to compare the outcomes of surgical treatment and conservative treatment at medium- and long-term period (minimum 2 years) in patients with lumbar stenosis who come to the observation of the PI's Team at the Rizzoli Orthopaedic Institute, through a series exhaustive questionnaires to self-administer to patients in order to define a path of "decision-making" as effective as possible for the patient and the doctor.
Multicenter registry data analysis of aortic valve stenosis patients that underwent elective, isolated transcutaneous aortic valve implantation (TAVI) or surgical aortic valve replacement between 2015 and 2019. In TAVI group only transfemoral access was considered.
This is a monocentric randomized prospective trial comparing 2 different endovascular strategies of intracranial arterial angioplasty in case of refractory intracranial arterial vasospastic stenosis : - chemical angioplasty - chemical and mechanical angioplasty