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This study is a continuation of two previous studies --- the Severe Ischemic Mitral Regurgitation (SMR) Trial (NCT00807040) and the Moderate Ischemic Mitral regurgitation (MMR) Trial (NCT00806988) --- to learn more about patients' health 5-10 years after their mitral valve surgeries. The investigators will collect long-term health information on SMR and MMR trial participants using electronic medical records, patient and/or family input, public records, and healthcare- and vital status-related databases.
This project is designed to demonstrate equivalence of Dotarem enhanced LGE-CMR (late gadolinium enhancement cardiac MRI) with Magnevist enhanced LGE-CMR from the standpoint of visual image quality, quantitative image quality, and association with clinical outcomes.
Acute myocardial infarction (AMI) pose a pool clinical outcome to men and women whom treatment was delayed. However, reperfusion time was limited in previous studies. To evaluate the system delay and clinical outcomes among Chinese patients with AMI, consecutive inpatient case prospectively collected from 2004 to 2016. Basic data and innovative evidence will accelerate evidence-based clinical practice and policy making, and improve AMI patients outcomes finally.
The "Prospective Multicenter Registry On RadiaTion Dose Estimates Of Cardiac CT AngIOgraphy IN Daily Practice in 2017" (PROTECTION-VI) study is a prospective registry and investigator-initiated initiative without third-party funding, which will collect and analyze the radiation dose exposure of Cardiac Computed Tomography Angiographic (CCTA) studies in current daily practice worldwide. Particularly, the study will assess the use of strategies for dose reduction during CCTA. A decade ago, the multicentre observational PROTECTION-I study has revealed that the dose-length-product of CCTA ranges between 568 - 1259 mGy x cm with a median of 885 mGy x cm. This corresponds to an estimated effective dose of approximately 12 mSv. Since then a variety of techniques have been developed and enhanced in order to reduce radiation exposure during CCTA. Recent studies demonstrated feasibility of dramatically reduced effective radiation doses during CCTA (0,1 - 0,3 mSv). This has been executed in small cohorts of patients at scientific expert centers. However, it remains unclear, if such low-level radiation dose exposure may be achieved in clinical routine and if diagnostic image quality is maintained. In order to analyze the magnitude of radiation dose exposure of CCTA in today's clinical practice and the current use of dose-saving techniques, we designed the PROTECTION-VI study. Eventually, this study may contribute to further improving radiation dose exposure for patients undergoing CCTA.
Coronary computed tomography angiography (CCTA) is a frequently performed test for the diagnosis and/or exclusion of coronary artery disease (CAD) in appropriately selected patients. The performance of non-contrast computed tomography for the detection and quantification of coronary calcification is typically performed prior to CCTA in an effort to identify significant calcification which may influence subsequent data acquisition during the CCTA. However, performance of calcium scoring adds significant radiation and most coronary calcification is proximal in its location, potentially visualized using a focused non-contrast scan. The purpose of this study is to prospectively compare the usefulness of a modified non-contrast CT, using a significantly shorter scan length and lower radiation parameters, as compared to standard coronary artery calcium scanning for the detection of coronary calcification that may influence subsequent CCTA performance.
The purpose of this study is to determine whether BVS(Bioresorbable Vascular Scaffold) implantation with optimal medical therapy can improve the outcome of patients with variant angina and moderate coronary artery disease.
Regional absolute myocardial blood flow during stress (sMBF) as measured by Positron Emission Tomography (PET) improves post mechanical revascularization provided there is a baseline stress induced perfusion defect. Coronary revascularization performed on regions without a stress induced perfusion defect does not increase the sMBF.
This prospective multicenter registry evaluates the efficacy of hybrid coronary revascularization (HCR) combining coronary artery bypass surgery (CABG) and percutaneous coronary intervention (PCI) in the treatment of multivessel coronary artery disease. CABG is to be performed in the left anterior descending artery and the left circumflex artery using only arterial grafts, whereas PCI is to be conducted for the treatment of significant stenotic disease in the right coronary artery with everolimus-eluting stents (EESs). This research plans to involve patients scheduled for coronary revascularization for multivessel coronary artery disease who consent to participate in the registry.
Design: The proposed study is a randomized study comparing the relative effectiveness of three lesion modification strategies (RA, SBS, or OAS) in the treatment of obstructive CCLs using the change in lumen size measurements (MLA, RLA, MSA and the ratio of MSA/MLA) obtained with IVUS or OCT. Patients will be blinded to treatment assignment for the duration of the study. Treatment: Patients who are randomized to RA will undergo coronary wiring of the CCL and subsequent advancement of the RA burr. The RA system is performed using standard technique under intravenous infusion of heparin. The atherectomy burr size will be determined by the operator. Patients who are randomized to OAS will undergo coronary wiring of the CCL and subsequent advancement of the OAS according to the manufacturer's guidelines. Control: Patients who are randomized to SBS will undergo coronary wiring and balloon inflation with SBS performed by standard technique under intravenous infusion of heparin. SBS will be used according to the AngioSculpt manufacturer's guidelines. Duration: 30 days follow-up. The primary trial objective is to determine which of the three treatment strategies for treating calcified coronary lesions (RA, SBS, or OA) is superior for obtaining higher ratio of final in-stent minimum lumen area/reference lumen area, as determined by IVUS or OCT (primary study endpoint). The secondary objectives are to compare the following: 1. Difference in pre- vs. post-treatment minimum lumen area (MLA, lumen area gain), as determined by IVUS or OCT (secondary endpoint) 2. Mean final minimal stent area (MSA), as assessed by IVUS or OCT (secondary endpoint) 3. Ratio of final in-stent minimum lumen diameter/reference lumen diameter, as determined by quantitative coronary angiography (secondary endpoint) 4. Incidence of major adverse cardiac events (death, myocardial infarction, target vessel revascularization) during 30 days of follow-up (secondary endpoints) 5. Procedure time, fluoroscopy time, and contrast volume (secondary endpoints)
This study evaluates mechanisms of arrhythmogenicity in hypertrophic cardiomyopathy, in comparison to patients with well-understood arrhythmogenic substrate (ischemic cardiomyopathy), as well as to individuals free from arrhythmogenic substrate