Cardiology

Widely used blood test could advance heart failure treatment

Biomedical experts believe that half of heart failure patients likely have low levels of the thyroid hormone T3 in their cardiac tissue. While heart failure symptoms are commonly attributed to cardiovascular conditions like ...

Cardiology

Cause of ventricular tachycardia determines treatment

Dear Mayo Clinic: Recently, I was diagnosed with ventricular tachycardia, but doctors said a cause cannot be determined. What usually causes this problem? Does knowing the cause make a difference in treatment?

Medical research

Why a blow to the chest can kill or save you

A blow to the chest can have highly contrasting effects. For instance, some baseball players have died after being hit in the chest by a baseball, while patients undergoing fatal cardiac tachyarrhythmias have been saved by ...

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