Active clinical trials for "Ischemia"

The purpose of this study is to evaluate the safety and performance of the Xpert(TM) self-expanding stent in infrapopliteal lesions as part of an overall treatment strategy in patients undergoing percutaneous intervention for the treatment of documented chronic critical limb ischemia (CLI).

Several pathophysiological theories have been proposed for the development of diabetic chronic complications. In recent years, the use of stem cells (totipotential, hematopoietic or endothelial lineages) has been reported as an adjunctive modality of treatment for ischemia models in animals and humans. Nevertheless, there are no reports in the use of stem cells for the treatment of human sensorimotor peripheral diabetic neuropathy. We performed this study to evaluate the effect of autologous hematopoietic CD34+ cell transplantation on nerve conduction velocity in patients with type 2 diabetes mellitus.

This study will test whether inhaling nitric oxide gas can improve blood flow to the heart, ventricular function, exercise tolerance in patients with coronary artery disease and chest pain that has not improved with medical or surgical therapy. Patients with coronary artery disease who have chest pain despite treatment with medicines and angioplasty or surgery may be eligible for this study. Those enrolled will receive monetary compensation for their participation in this study. The duration of the study is 5 days, with 2 testing periods lasting 2 days each. During one of the periods, the study participants will breathe nitric oxide mixed with room air through a face mask during the tests. During the other period, the participants will breathe room air alone through a face mask during the tests. At least 1 day will separate the treatment periods. During each of the 2 treatment periods (nitric oxide and room air), participants will undergo 4 tests to determine whether the treatment improves the heart's response to stress with increased heart rate and contraction. Approximately one hour before each of the tests, participants will breathe either nitric oxide mixed with room air or room air alone through the face mask, and continue the inhalation treatment while each test is being performed. The face mask will be removed at the end of each test. On the morning of the first day of each treatment period, participants will have a special echocardiogram with imaging of the heart. The echocardiogram will be performed during an infusion of dobutamine, a medicine that increases heart rate and contraction, and serves to stress the heart. This manner of stress testing is commonly used in hospitals around the country to determine if walls of the heart are receiving sufficient blood supply. That afternoon, participants will undergo a magnetic resonance imaging (MRI) study of the heart. The MRI will determine the heart's blood flow and contraction while receiving the same dosage of dobutamine as was used earlier in the day. On the morning of the second day of each treatment period, participants will exercise on a treadmill until moderately uncomfortable chest pain is reported. Later that morning, participants will undergo cardiac catheterization. For the cardiac catheterization, a long tube (catheter) will be placed into a vein of the neck once the skin is numbed with xylocaine. This tube will be positioned within the right atrium of the heart and into a tube-like structure called the coronary sinus, where venous blood exits the heart muscle. A small catheter will also be placed in an artery of the upper forearm after the skin has been numbed with xylocaine. Blood samples will be taken to allow us to measure the amount of nitric oxide transported in the blood. The blood samples will be drawn (through the tube in the heart and through the small tube in the artery) at the beginning of the study and during infusion of dobutamine to stress the heart. The dose of the dobutamine infusion will be the same dose used in the previous day's stress studies. After the completion of the first treatment period, we will stop testing for at least one day. Participants will begin the second treatment period with the inhalation treatment not received during the first treatment period.

To evaluate the impact of community educational interventions on patient delay time from onset of symptoms and signs of an acute myocardial infarction (AMI) to arrival at a hospital Emergency Department (ED). Also, to study the impact of community educational interventions on use of Emergency Medical Services (EMS) and EDs, on thrombolytic therapy, and on AMI case fatality.

To assess the feasibility of and test the methodology for a full-scale clinical trial of therapies for asymptomatic cardiac ischemia.

To assess the effect of non-surgical reperfusion on infarct size in patients with acute myocardial infarction.

In TIMI I, to assess the relative thrombolytic activity and side effects of intravenous recombinant tissue-type plasminogen activator (rt-PA) versus intravenous streptokinase in patients with acute myocardial infarction. In TIMI II, to assess whether intravenous rt-PA given in the early hours of acute myocardial infarction should be followed by percutaneous transluminal coronary angioplasty (PTCA).

To compare the effects of two intensive lipid-lowering regimens with conventional therapy on coronary atherosclerosis as assessed by arteriography.

To assess the safety and efficacy of optic nerve sheath decompression surgery for non-arteritic ischemic optic neuropathy (NAION).

This is a prospective, randomized, single blind, concurrent controlled, multi-center study. Patients presenting with symptoms of acute ischemic stroke who have evidence of a large vessel occlusion in the cerebral circulation.