Loading clinical trials...
Loading clinical trials...
Discover 22,668 clinical trials near New York, New York. Find research studies in your area.
Showing 21261-21280 of 22,668 trials
NCT00907855
Cardiac stress testing with functional nuclear imaging is an invaluable technique in the diagnostic and prognostic evaluation of patients with known or suspected ischemic heart disease. Selection of the appropriate type of nuclear stress test: exercise stress Myocardial Perfusion Imaging (MPI) versus pharmacologic stress MPI is crucial for not only diagnostic accuracy and prognostic evaluation, but also for sound clinical decisions and resource utilization. The Duke Activity Status Index (DASI) is a 12-item questionnaire that utilized self-reported physical work capacity to estimate peak metabolic equivalents (METs) and has been shown to be a valid measurement of functional capacity. The investigators hypothesized that the DASI may be the screening tool that evaluates functional capacity and guides selection of the optimal stress MPI study.
NCT01481012
The purpose of this study is to obtain data or information on how blood clotting factors are activated during open heart surgery. In particular, the investigators are interested in how blood clotting factors are activated by the heart-lung bypass machine and by left ventricular assist devices (LVAD). Patients on these two machines have an increased risk of bleeding and blood clot formation. This is because both machines stimulate the intrinsic coagulation pathway, one of the chemical pathways that cause blood to clot. The process of surgery itself also stimulates the "extrinsic coagulation pathway," the other chemical pathway that causes blood to clot. Stimulating these coagulation pathways can use up the body's clotting factors. As a result, patients may be at risk for both bleeding and blood clot formation. The investigators would like to study how the blood factors are activated during and after surgery, to help develop treatments to prevent bleeding and clot formation.