Cardiology: Puzzling Particles in the Heart

Many forms of heart disease are little understood, but one is especially mysterious: heart failure that strikes husky and seemingly healthy men and women in their prime, apparently without cause. Doctors, who now find the condition is by no means rare, say it is frightening to watch the often rapid, inexorable progress of the disease toward early death. They call it idiopathic cardiomyopathy (unexplained disease of the heart muscle), and treat it with drugs, which may be only briefly effective.

Now a British research team reports in the Lancet that the cause of...

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