My 44 year old nephew is having frequent pounding heartbeat. ekg normal, bp a little high(on bp meds), pulse normal(80), tsh normal...cardiologist?

An EKG is a static: Test that reflects the cardiac rhythm at the time it is taken. A holter monitor would be more likely to catch intermittent rhythm changes. Your pmd or a cardiologist can help you get one.

24 hour monitor: The symptom of pounding heartbeat can be significant, or may be related to a benign condition. If your nephew has these symptoms on a daily basis, a 24 hour (holter) monitor may be helpful in determining the cause of this symptom. Whether he sees a primary physician or cardiologist, this information will be important.