Should I call 911 when feeling faint with history of cardiac arrhythmia?

Yes. There are a variety of causes for feeling lightheaded or faint, but having a medical history that includes cardiac arrhythmia makes certain causes more likely than others. If you do not have a cardiologist that you can contact, it is best to call 911 or visit the emergency room to be evaluated and determine the cause of your symptoms.
Probably. If you're feeling your heart racing and you're feeling like you could pass out, you should definitely call 911. Better yet, lie down with your legs elevated (to raise your blood pressure) and have someone else call 911 for you.

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