View clinical trials related to Neovascularization, Pathologic.
Filter by:Amyotrophic Lateral Sclerosis, or Charcot's disease, is a neurodegenerative disease affecting motor neurons. The disease affects between 5 and 10 people per 100,000 in the world, nearly 7,000 patients are affected in France. The only therapeutic treatment available to date in France is riluzole, which slows the progression of the disease. Amyotrophic Lateral Sclerosis is the first degenerative disease affecting motor neurons. However, recent evidence suggests that the impairment extends beyond motor neurons alone. Optical Coherence Tomography analyzes made it possible to highlight ophthalmologic damage in patients with Amyotrophic Lateral Sclerosis, in particular at the macula and papilla, although some results are contradictory. No angiographic Optical Coherence Tomography analysis has been performed to date in patients with Amyotrophic Lateral Sclerosis. However, in the hypothesis of microvascular involvement participating in the pathophysiology of neurodegeneration in Amyotrophic Lateral Sclerosis, these examinations could provide relevant clinical and pathophysiological data by studying the retinal microvascularization of patients with the disease.
Type 3 neovascularization is a subtype of neovascular age-related macular degeneration (AMD) that is characterized by intraretinal neovascularization. Treat-and-extend (TAE) regimen is a widely-used, effective anti-vascular endothelial growth factor treatment regimen for neovascular AMD, regardless of subtypes of AMD. The purpose of the present study is to investigate the 18-month treatment outcome of TAE in type 3 neovascularization.
A Phase 1 randomized, double blinded, placebo-controlled, single dose escalation (SDE) and repeat dose escalation (RDE) study to evaluate safety and tolerability, and PK of KDR2-2 in healthy volunteers. The planned single dose levels are 0.03, 0.06, 0.12, and 0.24 mg/eye, and repeat dose levels are 0.06, 0.12, and 0.24 mg/eye, QID, × 6 days (one dose in the morning on Day 7). Subjects are randomized to KDR2-2 or placebo dosing (6:2 for SDE, or 8:2 for RDE) in each cohorts of relative dosing levels.
The bone fracture is usually diagnosed using an X-ray examination (the method of choice). However, in the case of the youngest patients (children and adolescents), it carries a potential risk of X-ray radiation exposure. What is important, an X-ray examination often fails to detect occult fractures or the early stages of a fracture with or without bone fusion. The literature emphasizes that from 2 to 36% of fractures may be unnoticed on X-ray images (false negative results). Therefore, additional possibilities are sought to improve the initial diagnosis. It was shown that ultrasound could be used instead of the conventional imaging. The most important advantages of the usg are the absence of radiation exposure and greater availability. Moreover, the evaluator is able to show neovascularization during usg examination, which is important in bone healing process. The aim of this study is (1) to validate the ultrasound imaging method for the fracture management; (2) to use an ultrasound imaging to assess the bone fracture and healing process during 8 weeks post injury. This study consists of 50 patients aged 10-18 years old. The forearm fracture will be diagnosed using an X-ray imaging as well as an ultrasound imaging in the first 3 days post injury (initial study). It is planned to assess the healing process after 2, 4, 6 and/or 8 weeks post injury (comparative study).
Stroke is the second leading cause of death in the Western world and the leading cause of major lifelong disability. About 15% of strokes are secondary to thrombosis or embolization of an unstable atheromatous carotid plaque. In these symptomatic patients, the degree of carotid stenosis is correlated with the risk of early recurrence. Patients with stenosis over 70% are therefore offered an endarterectomy, an operation to remove carotid plaque, to prevent future strokes[1]. In asymptomatic patients, the degree of stenosis is a limited predictor, and better risk stratification is required to assess the degree of plaque vulnerability and stroke risk of the patient. The therapeutic decision towards endarterectomy in addition to drug therapy is debated because of a variable and dependent benefit/risk balance for each patient. A number of imaging parameters have been studied: ulceration, heterogeneity, vascularization of the plaque for example, but their place is not well defined [2]. The usual evaluation of carotid stenosis is by conventional Doppler ultrasound with calculation of the degree of stenosis according to the NASCET criteria. For symptomatic stenoses the intervention is recommended when above 70% and is discussed from 50% to 70% of NASCET stenosis degree. For asymptomatic stenoses, the procedure is discussed when above 60% taking into account the patient's life expectancy, the risk of the surgery and the unstable nature of the plaque [2]. Destabilization of the carotid plaque is partially induced by inflammation associated with neo-vascularization. The detection of these new vessels by conventional contrast ultrasound has already shown a distinction between stable and unstable plaques, by the presence or absence of microbubbles in the plaque. However, this assessment is not very precise and only the most vascularized plaques can be detected. Ultrafast ultrasound Imaging is a new ultrasonic Imaging modality that allows detecting low speed flows, a tiny vascular structure within the vessel wall. RESEARCH HYPOTHESIS Plaques neo-vascularization would be more precisely detected and characterized by ultrafast imaging coupled with microbubble injection than conventional ultrasound imaging. A better assessment of plaque instability could improve the selection of patients for carotid endarterectomy and increase the benefit/risk ratio of this preventive surgery.
150 selected patients will be recruited, who have at least one atherosclerotic plaque in the carotid artery that is thicker than 2.0 mm and which is determined to be uniformly or predominantly echolucent by standard ultrasonography. For each of the plaques, standard ultrasonography will be used to evaluate lesion echogenicity, while contrast-enhanced ultrasonography (CEUS) will be used to perform the visual and quantitative analysis of neovascularization. Each technique will be applied at baseline (at the time of study enrollment) and following 0.5、1 year of Elococumab Injection treatment. During the study, these patients will be treated with Elococumab Injection (1ml:140mg),ih, every two weeks.
The purpose of this study is to determine the effectiveness of antiangiogenic therapy to choroidal neovascularization secondary to central chorioretinitis.
The first stage of this study will evaluates the tolerability of different concentrations of Conbercept eye drop to patients with corneal neovascularization. The second stage of this study will evaluate the effectiveness of conbercept eye drop initially.
The content of this research project is to identify the angiofibrotic switch, the transition from angiogenesis to fibrosis, in neovascular age-related macular degeneration (nAMD) longitudinally. Despite optimal treatment about 50% of eyes with nAMD develop fibrosis within 2 years, causing irreversible damage to the retina and functional loss. Objective measurement of fibrosis, however, is challenging, since clinical staging is subjective and current imaging modalities such as color fundus photography (CFP), fluorescein angiography (FA) and optical coherence tomography (OCT) often do not allow clear delineation. Novel imaging modalities such as polarization-sensitive OCT (PS-OCT), OCT angiography (OCTA) and adaptive-optics OCT (AO-OCT) offer identification of fibrous components and microvasculature of fibrotic lesions non-invasively with highest precision and shall thus be used in this study. Hypotheses: The investigators hypothesize to detect and quantify subclinical (i.e. not detectable on dilated fundus examination) areas of fibrosis using PS-OCT and determine the rate and exact location within the neovascular lesion. Furthermore, the investigators expect neuroretinal and microvascular changes, which will be assessed by AO-OCT and OCTA. Methods: Eighty eyes of 80 patients with chronic nAMD will be included and examined cross- sectionally to evaluate the accuracy of PS-OCT to detect and quantify fibrosis in comparison to gold standard imaging modalities. In addition, OCTA and AO-OCT will be performed to analyze the relationship between fibrous, neovascular and neuroretinal structures. Furthermore, forty eyes of 40 participants with treatment-naïve nAMD will be included and followed over 12 months with predefined follow-up intervals. Novel non-invasive imaging will be applied to objectively determine the exact time and extent of the angiofibrotic switch in nAMD during state-of-the- art therapy. This approach has not been done before and is clinically relevant for multiple reasons: Firstly, only little is known about the development of fibrosis in AMD during therapy. Secondly, the clinical diagnosis of subretinal fibrosis is subjective and does not allow reliable quantification. Thirdly, current gold standard imaging modalities (i.e. CFP and FA) for detection of fibrosis involve invasive and time-consuming procedures and do not allow three-dimensional analysis. Finally, our study may identify objective endpoints for future interventional trials.
The difficulty to measure blood flow in humans is connected with the necessity of using not invasive, reliable and reproducible techniques. There is several quantitative approaches to study eye blood flow which do not answer all these specifications. The laser doppler velocimetry allows movement speed measures but not vessel diameter. Optical coherence tomography doppler allows a simultaneous diameter and speed of travel (movement) measures, but presents a limited spatial resolution and thereby not easily reproducible vessel diameter measures. The investigators propose development of a technique allowing a simultaneous diameter and velocity measure of these vessels.