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 - Structural Heart, severe aortic stenosis, heart valve

The radiotracer 18F-sodium fluoride (18F-NaF) serves as a biomarker of calcification activity in patients with aortic stenosis and may predict disease progression, according to a study published in the March issue of Circulation: Cardiovascular Imaging.

 - PCI

An evaluation of radiation exposure to a large population of patients undergoing PCI and coronary angiography (CA) may help identify methods for optimizing patient safety, according to a study published online April 9 in Catheterization and Cardiovascular Interventions.

 - heart geometry

Keeping patients with atrial fibrillation on rather than off warfarin therapy during radiofrequency catheter ablation reduced the risk of periprocedural stroke in a randomized trial. The results were published online April 17 in Circulation.

 - healthcare cost

Congestive heart failure topped the list for 30-day readmissions of Medicare beneficiaries in 2011 and ranked among the top 10 high-volume conditions for two other payer categories in an analysis released in April.

 - Emergency

Location, location, location. Almost 60 percent of variation in hospital readmissions may be attributed to the county where a hospital resides, according to a study published online April 9 in Health Services Research. The findings challenge Medicare’s use of financial penalties for hospitals with higher than expected readmission rates.