Cardiology

What's at the 'heart' of a heartbeat?

In the confines of the thoracic chamber, a heart has lost its rhythm. Its two upper chambers, the atria, are beating out of sync with the two lower chambers, the ventricles. The resulting chaos is called atrial fibrillation ...

Cardiology

'A-fib' heart problem more common than thought, doctor finds

Several million older Americans have been diagnosed with atrial fibrillation, the abnormal heart rhythm abbreviated as A-fib, because they experienced symptoms such as palpitations, dizziness, and shortness of breath.

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