When your electrical system is working normally, the two upper chambers of the heart (atria) contract and pump blood into the two lower chambers (ventricles) in a well-coordinated way. This results in ...

Vivian Medithi is a freelance writer and critic with bylines at Guardian US, LA Review of Books and No Bells, among others. He previously covered the stock market as an Analyst Editor at InvestorPlace ...

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Atrial flutter is a heart disorder in which the heart beats out of its normal rhythm. The condition is similar to atrial fibrillation (afib) — the most common type of arrhythmia (abnormal heartbeat) — ...