An arrhythmia is an irregular heartbeat, but is not the same as an irregular heart rate. A normal heart rate is 50 to 100 beats per minute.

 Warning Signs and Symptoms

• Palpitations
• Skipped beats 
• Fluttering
• Slow Heartbeat - Bradycardias
• Rapid Heartbeat - Tachycardias
• Poor exercise tolerance
• Almost fainting - Presyncope
• Fainting - Syncope

Some arrhythmias are harmless. Others can be life-threatening.