The human heart, a fist-sized muscle, tirelessly beats billions of times throughout life, powering every cell by delivering oxygen and removing waste. Its rate varies significantly from birth to old ...

Heart muscle cells grown from patient stem cells—known as human induced pluripotent stem cell–derived cardiomyocytes, or ...

The family of Brooke Dawkins met the woman who received their daughter's heart. — -- The family of a Florida teen who died in 2014 was able to hear her heart beat again after meeting the woman ...

Though an estimated 60 million people around the world have atrial fibrillation, or A-fib, a type of irregular and often fast ...