View clinical trials related to Heart Valve Diseases.
Filter by:This is a trial to demonstrate the safety and effectiveness of the Freedom SOLO heart valve when used to replace a diseased or dysfunctional aortic valve or aortic valve prosthesis.
The purpose of this study is to evaluate the clinical efficacy of the mid-term treatment with sildenafil in patients with persistent moderate or severe pulmonary hypertension (PH) after a heart valve intervention.
Ischemia- reperfusion ( IR ) injuries were not only seen in the transplanted organs but also the remote organs such as lungs that brings major postoperative complications. Severe complications such as pulmonary infiltration and pulmonary edema following reperfusion were frequently associated with liver transplantation. Cardiac surgery performed with the use of cardiopulmonary bypass ( CPB ) provokes a systemic inflammatory response syndrome that affects postoperative pulmonary, myocardiac and renal functions. Previous study about the reperfusion injuries was focused on the leukocyte and endothelial activation and the following oxidative injuries, however, the alteration on pulmonary function such as dynamic compliance and the oxidative/antioxidative balance in erythrocytes and the following effects in CPB have not been fully studied. Erythrocytes' reaction to oxidative stress including cytoplasma and cell membrane should be studied because RBCs are the major circulating blood cells having different types of antioxidant system to capture reactive oxygen species ( ROS ) thus RBC may be severely injured by ROS or protected ROS injuries during CPB. In these three-year study, we plan to explore the extent and pattern of remote oxidative injuries in lungs by massive ROS production and the following products released from reperfused organs. In the first year, the remote pulmonary injuries from hepatic IR will be focused. We plan to establish an animal model for pulmonary function and pulmonary injury assessments including dynamic compliance (Cdyn), pulmonary edema wet-to-dry ratio (W/D), malondialdehyde (MDA) and histopathological findings under hepatic IR challenge. In the second year, the IR effects during and after CPB on circulating blood cells will be fully studied. We plan to investigate the magnitude, subtypes and timing on ROS production, the changes of oxidative and antioxidant activities of erythrocytes including cytoplasma and cell membrane, the changes on leukocytes and plasma to explore the roles of circulating erythrocytes on oxidative stress in CPB. In the third year, we plan to try propofol, stated having antioxidant in vivo and in vitro, on the remote pulmonary injuries following hepatic IR and CPB.
Patients requiring long term anticoagulation often undergo transition of their warfarin to heparin in anticipation of invasive surgical procedures such as pacemaker or ICD implantation. This may require inpatient hospitalization several days prior to and after the procedure, potentially increasing medical costs and patient inconvenience. Patients undergoing such a process are initiated on heparin while their INRs drift to normal levels. Immediately prior to surgery, heparin is discontinued and restarted several hours after the procedure. Unfortunately, this process has resulted in a high incidence of surgical wound hematomas and other bleeding complications often requiring longer periods of discontinued anticoagulation or repeat surgical exploration. Previous investigators have tried to reduce the incidence of wound hematomas by prolonging the time from surgical wound closure to the reinitiation of heparin. A small randomized trial demonstrated that there was no significant difference in the incidence of wound hematomas whether heparin was started 6 hours or 24 hours after surgery (J Am Coll Cardiology 2000;35:1915-8). This has led many investigators to perform pacemaker and ICD implantation without reversal of warfarin therapy. A recent retrospective observational study demonstrated that the incidence of wound hematomas in patients with an INR of 2.6 was no different than patients with an INR of 1.5 (PACE 2004;27:358-60). Furthermore, a more recent, larger retrospective observational study reported in abstract form at the recent Heart Rhythm Society Annual 2007 Scientific Meeting demonstrated that not only is performing pacemaker and ICD implantations safe without reversing warfarin anticoagulation, but the incidence of wound hematomas is significantly smaller as compared to the strategy of reversing warfarin and initiating periprocedural heparin. Given these findings, the hypothesis of this randomized study is that pacemaker and ICD implantation while fully anticoagulated on warfarin therapy is safe. Findings from this study will have significant implications on the clinical practice of pacemaker or ICD implantation in this patient population given that no randomized study on this subject has been performed to date.
This non-randomized, prospective, interventional observational multi-center study is designed to assess the long-term clinical performance of the Medtronic Melody™ Transcatheter Pulmonary Valve (TPV) in the post market environment over a period of five years after transcatheter implantation in patients with dysfunctional RVOT conduits. In addition, the quality of life of implanted subjects will be assessed over five years.
The purpose of this study is to compare cardiac output results obtained using the thermodilution push technique with the Pulmonary Arterial Catheter (PAC) to the predicted cardiac output results obtained from the non-invasive FloWave™ 1000 device.
The study hypothesizes that rate of thromboembolic complications of the On-X prosthesis is reduced as compared to the SJM prosthesis.
This is a trial to demonstrate the safety and effectiveness of the Mitroflow Aortic Heart Valve when used to replace a diseased or dysfunctional aortic valve or aortic valve prosthesis.
The purpose of this study is to determine the frequency of prosthesis-patient mismatch after mitral valve replacement and its effect on clinical outcomes.
The purpose of this study is to compare a new high vacuum pressure chest drainage system (NO-NUMO™) with the standard low vacuum pressure drainage system already in use in cardiac surgeries. The new system uses smaller diameter drainage tubing to remove blood from the chest after open heart surgery. This is less painful to the patient and should help the patient to breathe better after operation. Preliminary data suggests that the high vacuum suction is effective and practical, and could actually reduce the amount of chest tube bleeding after surgery without compromising heart function. This new high vacuum drainage system was approved by the FDA in 2002. Subsequent testing at University of California, Irvine indicated that this unique system may allow the surgeon to predict excessive postoperative bleeding before the patient is transferred out of the operating room, thus adding safety, convenience, and cost effectiveness to their use.