A cardiac arrhythmia is a problem with the rate or rhythm of the heartbeat. A heart can beat too fast (tachycardia), too slow (bradycardia) or with an irregular rhythm. Most arrhythmias are harmless, but some can be serious or even life-threatening.
A cardiac arrhythmia is a problem with the rate or rhythm of the heartbeat. A heart can beat too fast (tachycardia), too slow (bradycardia) or with an irregular rhythm. Most arrhythmias are harmless, but some can be serious or even life-threatening.