Harvard Health Books

Harvard Health Books

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Bypass Surgery

Bypass Surgery

Not that long ago, little could be done when a blocked or severely narrowed coronary artery cut off blood flow to part of the heart. Coronary arteries are key blood vessels that supply the heart...
Atrial Fibrillation

Atrial Fibrillation

To circulate blood effectively and efficiently, the heart’s four chambers must beat in a steady coordinated way. Trouble brews when they don’t. Take atrial fibrillation, the most common type of...