View clinical trials related to Ischemia.
Filter by:Mesenchymal stem cells from the bone marrow can be stimulated to differentiate into endothelial cells and participate in the development of new blood vessels in ischemic tissue. The aim of the study is in a phase I/II safety and efficacy study to evaluate the clinical effect of autologous mesenchymal stem cell therapy in patients with severe chronic myocardial ischemia.
Generalist physicians in the outpatient setting care for 80% of the 300,000 patients who have transient ischemic attacks (TIA) annually in the United States. Despite existing secondary prevention therapies, recurrent ischemic events are common following a TIA. Given the risk of poor outcomes and the important role of the generalist, new therapeutic approaches for patients with TIA are needed that can be applied by generalists to outpatients. This research will develop and evaluate a new therapeutic approach that centers on the observations that sleep-disordered breathing is a risk factor for cerebrovascular and cardiovascular disease, is common in patients with cerebrovascular disease, and is associated with poor outcome following a stroke or TIA. We posit that diagnosing and treating sleep-disordered breathing in the home of TIA patients can improve cerebrovascular and cardiovascular outcomes. The primary aims are to determine in TIA patients: 1) the prevalence of sleep-disordered breathing, 2) the feasibility of diagnosing and treating sleep-disordered breathing using an auto-titrating continuous positive airways pressure (auto-CPAP) machine within 24-hours of TIA symptom onset, 3) adherence to auto-CPAP, and 4) the effect of auto-CPAP on blood pressure. We will recruit 80 TIA patients to be randomly assigned to either the intervention or the control groups. Each patient in the intervention group will use an auto-CPAP machine for up to 90 days and will then receive an unattended sleep study using a sleep monitor. Each patient in the control group will receive two unattended sleep studies, one upon enrollment and another after 90 days.
Many studies have shown that if the human body is stressed by a lack of blood flow for a short period of time, the body develops defenses to make the body more resistant to a future stress from lack of blood flow. This natural defense system is called preconditioning. Finding medications that have a preconditioning effect to protect against damage from loss of blood flow would be of great help in the treatment of diseases such as heart attacks and stroke that occur because of blockages of blood flow. Predicting future heart attacks or strokes is very difficult and makes it difficult to study medications that could have a preconditioning effect. However, it has recently been recognized that we can mimic the preconditioning effect in the human arm, by blocking blood flow using a blood pressure cuff under pressure. Here, blowing up the cuff for 5 minutes and then letting the pressure out for 5 minutes and repeating this process twice more (a way to precondition the arm), has been shown to improve blood vessel function in response to a longer period of blood pressure cuff inflation (20 minutes). As nitrite, a naturally occurring blood substance, has biological effects suggesting that it may mimic preconditioning. The main objective of this study is to assess whether nitrite is equivalent to preconditioning in its capacity to protect the forearm blood flow in response to a 20 minute blockage of blood flow by blood pressure cuff inflation of the forearm. We hypothesize that in human subjects the ischemic preconditioning program works through activation of the pool of nitrite in the blood stream. Moreover, we propose that nitrite treatment will improve (1) blood vessel recovery (2) skeletal muscle blood flow and (3) skeletal muscle mitochondrial function and (4) reduce the activation of inflammation in response to the 20 minute stress of blood pressure cuff inflation.
The chemokine CXCL8 plays a key role in the recruitment and activation of polymorphonuclear neutrophils in post-ischemia reperfusion injury after solid organ transplantation. Reparixin is a novel, specific inhibitor of CXCL8. This study is configured to explore the safety and efficacy of reparixin in preventing the delayed graft function (DGF) after kidney transplantation.
The goal of the trial is to determine whether human albumin, administered within 5 hours of symptom onset, improves the 3-month outcome of subjects with acute ischemic stroke.
We, the researchers at Lawson Health Research Institute, propose to investigate the impact of surgical ischemia and reperfusion on skeletal muscle microcirculation using a hand-held microscope.
Patients with stroke or transient ischemic attach should receive advise on smoking cessation. It is however unknown if an intensive smoking cessation program is better than ordinary advise on smoking cessation during hospitalisation for stroke or transient ischemic attack. The aim of the study was to assess if an intensive smoking cessation program made more patients stop smoking after stroke or transient ischemic attack.
The ultimate goal of this multicenter, phase II study is to increase blood pressure until either a neurologic response is seen or a target mean arterial pressure of 30% above baseline is achieved. IV fluids, IV phenylephrine and/or IV norepinephrine are used to rapidly raise mean arterial pressure in a controlled manner as serial assessments of neurologic function are performed.
Near-infrared spectroscopy can be used to determine the relative oxygen saturation in tissues up to 2cm below the skin. It has been investigated, with success, in cerebral, gastrointestinal, and muscle tissue, and shows promise in numerous indications involving tissue ischemia. In the current study, we propose to examine one hundred patients requiring either bypass or angioplasty due to chronic critical limb ischemia resulting from peripheral arterial disease. We intend to challenge patients before and after the intervention, using either an inflated blood pressure cuff or toe raises, to determine if oxygen saturation recovery time in the affected limb is correlated with symptom resolution (i.e. treatment success). Near-infrared spectroscopy will be performed using the ODISsey tissue oximeter developed by ViOptix, Inc. The proposed study will take approximately one year to complete enrolment, and has a follow-up period of 6 months post-intervention. Study Hypothesis: Knowledge of tissue oxygen saturation enhances clinical decision making in patients with chronic critical limb ischemia.
The purpose of this study is to determine if stem cell therapy with your own cells (autologous cells) delivered with a catheter to regions of the heart with poor blood flow will be safe and if it will relieve your chest pain, increase the blood flow, and/or improve the cardiac contractility (function) by regenerating blood vessels in your heart.