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This study tests whether a feature called HeartLogic, built into certain implanted heart devices, can help doctors manage heart failure better. About 1,428 adults who already have a compatible device will be randomly assigned to have HeartLogic turned on or off. The goal is to se…

This study tests whether two common supplements—coenzyme Q10 and selenium—can lower the risk of heart failure complications. About 4,000 adults with heart failure in Denmark will take either the supplements or placebos for 2-3 years. Researchers will track how many are hospitaliz…

This large study in Denmark is testing whether the shingles vaccine (Shingrix) can do more than prevent shingles—it may also lower the risk of heart attacks, strokes, and dementia. About 162,000 adults aged 65 and older will either get the vaccine or no vaccine, and researchers w…