Today an ekg detected an irregular heart beat - and arrhythmia. what may i expect when i see a cardiologist?

A professional: Opinion. Your test will be reviewed and option presented. Medication or ablation and avoidance of stimulants, further testing could be offered.

That depends!: There are arrythmias that are common and not serious - and arrythmias that are dangerous. A lot depends on your age and overall medical condition. Your cardiologist may do an echocardiogram - a soundwave test to look at your heart "squeeze" and valve function. They may do a "stress test" to see how well your heart works when you exercise. In the meantime, call if you have symptoms!

Arrhythmia : It depends what they found on ekg. Arrhythmia can be very variable. Depending upon what kind of arrhythmia, you may need nothing or further treatment.