Enlarge (credit: mgstanton) Atrial fibrillation is a heart disorder that causes the upper chambers of the heart to spasm instead of beating regularly. While that sounds dangerous, the lack of a regular heartbeat itself isn’t dangerous. Instead, a-fib causes lots of indirect problems that can be debilitating or fatal. We’re making progress in understanding the…

via Why understanding the genetics of my heart disease isn’t much help — Ars Technica

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