Journal of the American College of Cardiology
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J. Am. Coll. Cardiol. · Aug 2011
Multicenter StudyPrevalence and characteristics of early repolarization in the CASPER registry: cardiac arrest survivors with preserved ejection fraction registry.
We evaluated the prevalence and characteristics of early repolarization in patients in CASPER (Cardiac Arrest Survivors With Preserved Ejection Fraction Registry). ⋯ Early repolarization is present in a significant proportion of causally diagnosed and idiopathic VF. It is often intermittent and more pronounced in IVF patients. (Registry of Unexplained Cardiac Arrest; NCT00292032).
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J. Am. Coll. Cardiol. · Aug 2011
International participation in cardiovascular randomized controlled trials sponsored by the National Heart, Lung, and Blood Institute.
The aim of this study was to describe international enrollment and participation in National Institutes of Health (NIH)-sponsored cardiovascular randomized controlled trials (RCTs). ⋯ Cardiovascular RCTs sponsored by the National Heart, Lung, and Blood Institute have substantial rates of international enrollment, particularly coronary artery disease trials. Given questions of applicability and ethical and financial considerations, IP in U.S. clinical trials deserves further scrutiny.
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J. Am. Coll. Cardiol. · Aug 2011
Comparative StudyPrognostic impact of staged versus "one-time" multivessel percutaneous intervention in acute myocardial infarction: analysis from the HORIZONS-AMI (harmonizing outcomes with revascularization and stents in acute myocardial infarction) trial.
The purpose of this study was to compare a one-time primary percutaneous coronary intervention (PCI) of the culprit and nonculprit lesions with PCI of only the culprit lesion and staged nonculprit PCI at a later date in patients with ST-segment elevation myocardial infarction (STEMI) and multivessel disease. ⋯ A deferred angioplasty strategy of nonculprit lesions should remain the standard approach in patients with STEMI undergoing primary PCI, as multivessel PCI may be associated with a greater hazard for mortality and stent thrombosis. (Harmonizing Outcomes With Revascularization and Stents in Acute Myocardial Infarction [HORIZONS-AMI]; NCT00433966).
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J. Am. Coll. Cardiol. · Aug 2011
Aspirin extrusion from human platelets through multidrug resistance protein-4-mediated transport: evidence of a reduced drug action in patients after coronary artery bypass grafting.
In this study we investigate: 1) the role of multidrug resistance protein-4 (MRP4), an organic anion unidirectional transporter, in modulating aspirin action on human platelet cyclooxygenase (COX)-1; and 2) whether the impairment of aspirin-COX-1 interaction, found in coronary artery bypass grafting (CABG) patients, could be dependent on MRP4-mediated transport. ⋯ Aspirin is a substrate for MRP4 and can be extruded from platelet through its transportation. Aspirin effect on COX-1 is little-related to MRP4-mediated aspirin transport in HV, but in CABG patients with MRP4 over-expression, its pharmacological inhibition enhances aspirin action in an efficient way.
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J. Am. Coll. Cardiol. · Aug 2011
Transapical transcatheter aortic valve implantation in the presence of a mitral prosthesis.
We review our experience with transapical transcatheter aortic valve implantation (AVI) in patients with functioning mitral prostheses, and describe the technical considerations. ⋯ This report details the technical lessons learned thus far from our first 10 patients. Excellent procedural success and early outcomes in patients with functioning mitral prosthesis can be achieved.